BACKGROUND

[0001] Equipment used in the oil and gas industry may be exposed to high- temperature and/or high-pressure environments.

SUMMARY

[0002] A co-molded seal element can include a first portion that includes a first polymeric material; a second portion that includes a second polymeric material; and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. Various other apparatuses, systems, methods, etc., are also disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

[0003] Features and advantages of the described implementations can be more readily understood by reference to the following description taken in

conjunction with the accompanying drawings.

[0004] Fig. 1 illustrates examples of equipment in geologic environments;

[0005] Fig. 2 illustrates an example of an electric submersible pump system;

[0006] Fig. 3 illustrates examples of equipment;

[0007] Fig. 4 illustrates an example of a method and an example of a seal element;

[0008] Fig. 5 illustrates an example of a method and an example of a seal element;

[0009] Fig. 6 illustrates an example of a seal element;

[0010] Fig. 7 illustrates an example of a seal element;

[0011] Fig. 8 illustrates an example of a seal element;

[0012] Fig. 9 illustrates examples of seal elements;

[0013] Fig. 10 illustrates examples of seal elements;

[0014] Fig. 1 1 illustrates examples of seal elements;

[0015] Fig. 12 illustrates an example of a method and an example of a seal element;

[0016] Fig. 13 illustrates examples of seal elements with respect to

environmental conditions; [0017] Fig 14 illustrates examples of equipment with one or more seal elements;

[0018] Fig 15 illustrates examples of equipment with one or more seal elements;

[0019] Fig 16 illustrates an example of a system and an example of a method; and

[0020] Fig 17 illustrates example components of a system and a networked system

DETAILED DESCRIPTION

[0021] The following description includes the best mode presently

contemplated for practicing the described implementations. This description is not to be taken in a limiting sense, but rather is made merely for the purpose of describing the general principles of the implementations. The scope of the described

implementations should be ascertained with reference to the issued claims.

[0022] As an example, a seal element can include multiple materials such as, for example, two or more distinct elastomer compound materials that are

manufactured into a single composite seal element. In such an example, by joining different types of materials into a composite seal element via a process such as co- molding, the range of applicability of the seal element may be extended. For example, one material may provide for sealing over a first range of conditions and another material may provide for sealing over a second range of conditions where the first and second ranges may be offset (e.g., overlapping, distinct, etc.). As an example, a co-molded seal element may be suitable for use in applications that differ with respect to temperature ranges. As an example, a co-molded seal element may improve resistance to thermal cycling. As an example, a co-molded seal may improve resistance to downhole fluids and gases and, for example, gas

decompression damage.

[0023] As an example, one or more co-molded seal elements may be installed in a pump system such as, for example, an electric submersible pump (ESP) system. Such seal elements may provide for improved reliability in ESP system applications where large temperature and pressure changes exist that may otherwise increase risk of seal leakage, etc. [0024] As an example, a seal element can include a combination of different base elastomers with similar cure systems. As an example, a seal element may be made via a curing process that acts to co-mold different materials into a composite (e.g., a co-molded seal element). Such a process may create a co-molded composite seal element that may be suitable for wider temperature ranges when compared to a seal element formed of a single material. As an example, a co- molded seal element may be used in applications that may otherwise implement two or more seal elements.

[0025] As an example, an ESP system can include one or more co-molded seal element. In such an example, a co-molded seal may be positioned with respect to one or more pressure compensation features in the ESP system. As an example, a pressure compensation mechanism may act to maintain a pressure differential over a seal element region to a pressure differential less than about 0.7 MPa (e.g., about 100 psi), for example, consider a range from about 0.07 MPa (e.g., about 10 psi) to about 0.34 MPa (e.g., about 50 psi).

[0026] As an example, a co-molded seal may be positioned in a gland that is exposed to a pressure differential. In such an example, force applied to the co- molded seal at the time of installation may act to evacuate air from regions where the co-molded seal element contacts gland surfaces such that risk of formation of a pressure chamber, as may be associated with separate seal elements, is reduced. Pressure chamber formation can raise issues, for example, where air at atmospheric pressure is trapped between two separate seal elements. In such an example, the presence of the chamber between the two separate seal elements may cause the seal elements to be exposed to pressures (e.g., as in a deep well) that may increase risk of extrusion of one or both of the seal elements.

[0027] As an example, an arrangement with two separate seal elements may include a main o-ring and a back-up o-ring that are in series (e.g., adjacent seats, grooves, etc.) to seal an internal region from an external region. In such an example, where the main o-ring fails, the back-up o-ring may aim to prevent fluid from the external region leaking through to the internal region (e.g., where pressure is higher in the external region than the internal region). However, during assembly of components, gas may be trapped between the main o-ring and the back-up o-ring where such gas may be at atmospheric pressure. Once the assembled components are deployed in a different environment, the trapped gas may become an issue as to seal integrity (e.g., for the main o-ring and/or for the back-up o-ring). As an example, a single co-molded seal element may be implemented where upon application of force, gas may be evacuated from a region or regions between portions of the co- molded seal element. For example, during assembly of components, force may be applied that deforms the co-molded seal element to conform to surfaces of components such that one or more gas-fillable regions between portions of the col- molded seal are diminished (e.g., no atmospheric gas chamber creation during assembly). In such an example, the co-molded seal element may include a first portion made of a first polymeric material and a second portion made of a second polymeric material where the materials are crosslinked at an interface portion. As an example, a first portion of a co-molded seal element may be exposed to an internal environment of an assembly of components while a second portion of the co-molded seal element may be exposed to an external environment of the assembly of components. As an example, an assembly of components may include a co-molded seal element in series with one or more seal elements.

[0028] As an example, one or more co-molded seal elements may be installed in an ESP system destined for use in a subsea environment. For example, consider installation of at least a portion of the ESP system at a seafloor temperature (e.g., about 4 degrees C) and a seafloor pressure (e.g., about 70 MPa (e.g., about 10 ksi) to about 140 MPa (e.g., about 20 ksi)). At a high seafloor pressure, the glass transition temperature of an elastomer seal element will be shifted upward (e.g., consider about 1 degree C per about 5.2 MPa (e.g., about 750 psi)). In such an example, a low temperature seal element material may facilitate sealing.

[0029] As to duration of use, after installation, an ESP system may be expected to run for several years or more where temperatures may be about 180 degrees C to about 260 degrees C with, for example, possible thermal cycles down to about 60 degrees C. To handle such temperatures, a seal element material may be a high temperature elastomer, for example, with resistance to compression set. However, such materials may exhibit poor low temperature sealing capability (e.g., as may be associated with subsea applications).

[0030] As an example, a co-molded seal element may include one or more materials that are resistant to well bore fluids. As an example, a co-molded seal element may include one or more materials that are resistant to well treatment chemicals (e.g., acids, solvents, amines, etc.). For example, consider one or more perfluoroelastomers (e.g., ASTM designation FFKM). As an example, consider one or more of a TECNOFLON™ perfluoroelastomers (Solvay, Brussels, Belgium), CHEMRAZ™ perfluoroelastomers (Greene Tweed, Kulpsville, Pennsylvania), KALREZ™ perfluoroelastomers (E. I. du Pont de Nemours and Company,

Wilmington, Delaware), etc.

[0031] As an example, two or more elastomers curable via a common mechanism may be co-molded into a "snowman" shaped "o-ring" seal element. In such an example, ring height of one or more portions of the co-molded seal element may be selected to conform to a desired compression once installed. Upon installation, once the co-molded seal element is compressed, free volume between portions of the seal element where pressure can be trapped may be minimized. As an example, one or more back-up rings may be included in a system.

[0032] As an example, a co-molded seal element may include a high temperature portion and a lower temperature portion. For example, consider a co- molded seal element formed of portions that include peroxide cured FFKM to form a cross-linked portion therebetween (e.g., consider a Solvay TECNOFLON™ PFR 95HT (high temperature) material and a Solvay PFR LT (low temperature) material). In such an example, a high temperature portion may be formulated with a material that can tolerate about 300 degrees C while a low temperature portion may be formulated with a material that has a glass transition temperature below about -30 degrees C (e.g., to provide low temperature sealability). As an example, a co- molded seal element may include a first portion crosslinked to a second portion where the first and second portions differ. For example, consider the

aforementioned co-molded seal element as providing an operational temperature range from about -45 degrees C to about 300 degrees C while providing resistance to well fluids and thermal cycling (e.g., which may allow an operator to perform a wide range of well interventions with the equipment still in the well).

[0033] As an example, a method can include co-molding via selection of elastomers with compatible chemistry to allow for some mixing at an interface where one or more crosslinking mechanism can create crosslinks between a first portion and a second portion at the interface (e.g., crosslinking between elastomers).

[0034] As an example, a co-molded seal element may include one or more of FFKM elastomers, HNBR elastomers, FKM (e.g., VITON™ elastomers, E. I. du Pont de Nemours and Company, Wilmington, Delaware) elastomers, and FEPM elastomers (e.g., AFLAS™ elastomers, Exton, Pennsylvania).

[0035] As an example, a co-molded seal element may include a plurality of portions at least some of which differ and are crosslinked at an interface. As an example, a co-molded seal element can include a low temperature portion and a high temperature portion. As an example, a co-molded seal element can include a decompression resistant portion. As an example, a co-molded seal element may provide mechanical reinforcement to a system, for example, in case of gas decompression.

[0036] As an example, a co-molded seal element may be constructed to meet a desired temperature range by adjusting the compression on each co-molded seal element portion. For example, a high temperature seal element portion can be given a lower percent compression in order to limit compression set at elevated

temperatures, and a low temperature seal element portion can have a higher percent compression for improved sealing at low temperatures.

[0037] As an example, one or more back up rings using a high strength thermoplastic may be used in a system to provide additional mechanical protection, for example, in case of high differential pressure.

[0038] As an example, a co-molded seal element may be implemented in a system that is suitable for use in the oil and gas industry. For example, consider an ESP system where pressure compensation features may aim to achieve a desired differential pressure. As an example, a co-molded seal element may be

implemented in a system where a relatively low differential pressure exists for seal elements in pressure compensated oil and gas equipment.

[0039] Fig. 1 shows examples of geologic environments 120 and 140. In Fig. 1 , the geologic environment 120 may be a sedimentary basin that includes layers (e.g., stratification) that include a reservoir 121 and that may be, for example, intersected by a fault 123 (e.g., or faults). As an example, the geologic environment 120 may be outfitted with any of a variety of sensors, detectors, actuators, etc. For example, equipment 122 may include communication circuitry to receive and to transmit information with respect to one or more networks 125. Such information may include information associated with downhole equipment 124, which may be equipment to acquire information, to assist with resource recovery, etc. Other equipment 126 may be located remote from a well site and include sensing, detecting, emitting or other circuitry. Such equipment may include storage and communication circuitry to store and to communicate data, instructions, etc. As an example, one or more satellites may be provided for purposes of communications, data acquisition, etc. For example, Fig. 1 shows a satellite in communication with the network 125 that may be configured for communications, noting that the satellite may additionally or alternatively include circuitry for imagery (e.g., spatial, spectral, temporal, radiometric, etc.).

[0040] Fig. 1 also shows the geologic environment 120 as optionally including equipment 127 and 128 associated with a well that includes a substantially horizontal portion that may intersect with one or more fractures 129. For example, consider a well in a shale formation that may include natural fractures, artificial fractures (e.g., hydraulic fractures) or a combination of natural and artificial fractures. As an example, a well may be drilled for a reservoir that is laterally extensive. In such an example, lateral variations in properties, stresses, etc. may exist where an

assessment of such variations may assist with planning, operations, etc. to develop the reservoir (e.g., via fracturing, injecting, extracting, etc.). As an example, the equipment 127 and/or 128 may include components, a system, systems, etc. for fracturing, seismic sensing, analysis of seismic data, assessment of one or more fractures, etc.

[0041] As to the geologic environment 140, as shown in Fig. 1 , it includes two wells 141 and 143 (e.g., bores), which may be, for example, disposed at least partially in a layer such as a sand layer disposed between caprock and shale. As an example, the geologic environment 140 may be outfitted with equipment 145, which may be, for example, steam assisted gravity drainage (SAGD) equipment for injecting steam for enhancing extraction of a resource from a reservoir. SAGD is a technique that involves subterranean delivery of steam to enhance flow of heavy oil, bitumen, etc. SAGD can be applied for Enhanced Oil Recovery (EOR), which is also known as tertiary recovery because it changes properties of oil in situ.

[0042] As an example, a SAGD operation in the geologic environment 140 may use the well 141 for steam-injection and the well 143 for resource production. In such an example, the equipment 145 may be a downhole steam generator and the equipment 147 may be an electric submersible pump (e.g., an ESP). As an example, one or more electrical cables may be connected to the equipment 145 and one or more electrical cables may be connected to the equipment 147. For example, as to the equipment 145, a cable may provide power to a heater to generate steam, to a pump to pump water (e.g., for steam generation), to a pump to pump fuel (e.g., to burn to generate steam), etc. As to the equipment 147, for example, a cable may provide power to power a motor, power a sensor (e.g., a gauge), etc.

[0043] As illustrated in a cross-sectional view of Fig. 1 , steam injected via the well 141 may rise in a subterranean portion of the geologic environment and transfer heat to a desirable resource such as heavy oil. In turn, as the resource is heated, its viscosity decreases, allowing it to flow more readily to the well 143 (e.g., a resource production well). In such an example, equipment 147 may then assist with lifting the resource in the well 143 to, for example, a surface facility (e.g., via a wellhead, etc.).

[0044] As to a downhole steam generator, as an example, it may be fed by three separate streams of natural gas, air and water (e.g., via conduits) where a gas- air mixture is combined first to create a flame and then the water is injected downstream to create steam. In such an example, the water can also serve to cool a burner wall or walls (e.g., by flowing in a passageway or passageways within a wall). As an example, a SAGD operation may result in condensed steam accompanying a resource (e.g., heavy oil) to a well. In such an example, where a production well includes artificial lift equipment such as an ESP, operation of such equipment may be impacted by the presence of condensed steam (e.g., water). Further, as an example, condensed steam may place demands on separation processing where it is desirable to separate one or more components from a hydrocarbon and water mixture.

[0045] Each of the geologic environments 120 and 140 of Fig. 1 may include harsh environments therein. For example, a harsh environment may be classified as being a high-pressure and high-temperature environment. A so-called HPHT environment may include pressures up to about 140 MPa (e.g., about 20 ksi) and temperatures up to about 205 degrees C (e.g., about 400 degrees F), a so-called ultra-HPHT environment may include pressures up to about 240 MPa (e.g., about 35 ksi) and temperatures up to about 260 degrees C (e.g., about 500 degrees F) and a so-called HPHT-hc environment may include pressures greater than about 240 MPa (e.g., about 35 ksi) and temperatures greater than about 260 degrees C (e.g., about 500 degrees F). As an example, an environment may be classified based in one of the aforementioned classes based on pressure or temperature alone. As an example, an environment may have its pressure and/or temperature elevated, for example, through use of equipment, techniques, etc. For example, a SAGD operation may elevate temperature of an environment (e.g., by 100 degrees C or more).

[0046] As an example, an environment may be classified based at least in part on its chemical composition. For example, where an environment includes hydrogen sulfide (H ₂ S), carbon dioxide (C0 ₂ ), etc., the environment may be corrosive to certain materials. As an example, an environment may be classified based at least in part on particulate matter that may be in a fluid (e.g., suspended, entrained, etc.). As an example, particulate matter in an environment may be abrasive or otherwise damaging to equipment. As an example, matter may be soluble or insoluble in an environment and, for example, soluble in one environment and substantially insoluble in another.

[0047] Conditions in a geologic environment may be transient and/or persistent. Where equipment is placed within a geologic environment, longevity of the equipment can depend on characteristics of the environment and, for example, duration of use of the equipment as well as function of the equipment. For example, a high-voltage power cable may itself pose challenges regardless of the environment into which it is placed. Where equipment is to endure in an environment over a significant period of time, uncertainty may arise in one or more factors that could impact integrity or expected lifetime of the equipment. As an example, where a period of time may be of the order of decades, equipment that is intended to last for such a period of time should be constructed with materials that can endure environmental conditions imposed thereon, whether imposed by an environment or environments and/or one or more functions of the equipment itself.

[0048] Fig. 2 shows an example of an ESP system 200 that includes an ESP 210 as an example of equipment that may be placed in a geologic environment. As an example, an ESP may be expected to function in an environment over an extended period of time (e.g., optionally of the order of years). As an example, commercially available ESPs (such as the REDA™ ESPs marketed by

Schlumberger Limited, Houston, Texas) may find use in applications that require, for example, pump rates in excess of about 4,000 barrels per day and lift of about 3.6 km (e.g., about 12,000 feet) or more.

[0049] In the example of Fig. 2, the ESP system 200 includes a network 201 , a well 203 disposed in a geologic environment, a power supply 205, the ESP 210, a controller 230, a motor controller 250 and a VSD unit 270. The power supply 205 may receive power from a power grid, an onsite generator (e.g., natural gas driven turbine), or other source. The power supply 205 may supply a voltage, for example, of about 4.16 kV.

[0050] As shown, the well 203 includes a wellhead that can include a choke (e.g., a choke valve). For example, the well 203 can include a choke valve to control various operations such as to reduce pressure of a fluid from high pressure in a closed wellbore to atmospheric pressure. Adjustable choke valves can include valves constructed to resist wear due to high-velocity, solids-laden fluid flowing by restricting or sealing elements. A wellhead may include one or more sensors such as a temperature sensor, a pressure sensor, a solids sensor, etc.

[0051] As to the ESP 210, it is shown as including cables 21 1 (e.g., or a cable), a pump 212, gas handling features 213, a pump intake 214, a motor 215, one or more sensors 216 (e.g., temperature, pressure, current leakage, vibration, etc.) and optionally a protector 217. The well 203 may include one or more well sensors 220, for example, such as the commercially available OPTICLINE™ sensors or WELLWATCHER BRITEBLUE™ sensors marketed by Schlumberger Limited (Houston, Texas). Such sensors are fiber-optic based and can provide for real time sensing of temperature, for example, in SAGD or other operations. As shown in the example of Fig. 1 , a well can include a relatively horizontal portion. Such a portion may collect heated heavy oil responsive to steam injection. Measurements of temperature along the length of the well can provide for feedback, for example, to understand conditions downhole of an ESP. Well sensors may extend thousands of feet into a well (e.g., a kilometer or more) and beyond a position of an ESP.

[0052] In the example of Fig. 2, the controller 230 can include one or more interfaces, for example, for receipt, transmission or receipt and transmission of information with the motor controller 250, a VSD unit 270, the power supply 205 (e.g., a gas fueled turbine generator, a power company, etc.), the network 201 , equipment in the well 203, equipment in another well, etc.

[0053] As shown in Fig. 2, the controller 230 can include or provide access to one or more modules or frameworks. Further, the controller 230 may include features of an ESP motor controller and optionally supplant the ESP motor controller 250. For example, the controller 230 may include the UNICONN™ motor controller 282 marketed by Schlumberger Limited (Houston, Texas). In the example of Fig. 2, the controller 230 may access one or more of the PIPESIM framework 284, the ECLIPSE™ framework 286 marketed by Schlumberger Limited (Houston, Texas) and the PETREL™ framework 288 marketed by Schlumberger Limited (Houston, Texas) (e.g., and optionally the OCEAN™ framework marketed by Schlumberger Limited (Houston, Texas)).

[0054] In the example of Fig. 2, the motor controller 250 may be a

commercially available motor controller such as the UNICONN™ motor controller. The UNICONN™ motor controller can connect to a SCADA system, the

ESPWATCHER™ surveillance system, etc. The UNICONN™ motor controller can perform some control and data acquisition tasks for ESPs, surface pumps or other monitored wells. The UNICONN™ motor controller can interface with the

PHOENIX™ monitoring system, for example, to access pressure, temperature and vibration data and various protection parameters as well as to provide direct current power to downhole sensors. The UNICONN™ motor controller can interface with fixed speed drive (FSD) controllers or a VSD unit, for example, such as the VSD unit 270.

[0055] For FSD controllers, the UNICONN™ motor controller can monitor ESP system three-phase currents, three-phase surface voltage, supply voltage and frequency, ESP spinning frequency and leg ground, power factor and motor load.

[0056] For VSD units, the UNICONN™ motor controller can monitor VSD output current, ESP running current, VSD output voltage, supply voltage, VSD input and VSD output power, VSD output frequency, drive loading, motor load, three- phase ESP running current, three-phase VSD input or output voltage, ESP spinning frequency, and leg-ground.

[0057] The UNICONN™ motor controller can include control functionality for VSD units such as target speed, minimum and maximum speed and base speed (voltage divided by frequency); three jump frequencies and bandwidths; volts per hertz pattern and start-up boost; ability to start an ESP while the motor is spinning; acceleration and deceleration rates, including start to minimum speed and minimum to target speed to maintain constant pressure/load (e.g., from about 0.01 Hz/10,000 s to about 1 Hz/s); stop mode with PWM carrier frequency; base speed voltage selection; rocking start frequency, cycle and pattern control; stall protection with automatic speed reduction; changing motor rotation direction without stopping;

speed force; speed follower mode; frequency control to maintain constant speed, pressure or load; current unbalance; voltage unbalance; overvoltage and

undervoltage; ESP backspin; and leg-ground.

[0058] In the example of Fig. 2, the ESP motor controller 250 includes various modules to handle, for example, backspin of an ESP, sanding of an ESP, flux of an ESP and gas lock of an ESP. As mentioned, the motor controller 250 may include any of a variety of features, additionally, alternatively, etc.

[0059] In the example of Fig. 2, the VSD unit 270 may be a low voltage drive (LSD) unit, a medium voltage drive (MVD) unit or other type of unit (e.g., a high voltage drive, which may provide a voltage in excess of about 4.16 kV). For a LVD, a VSD unit can include a step-up transformer, control circuitry and a step-up transformer while, for a MVD, a VSD unit can include an integrated transformer and control circuitry. As an example, the VSD unit 270 may receive power with a voltage of about 4.16 kV and control a motor as a load with a voltage from about 0 V to about 4.16 kV.

[0060] The VSD unit 270 may include commercially available control circuitry such as the SPEEDSTAR™ MVD control circuitry marketed by Schlumberger Limited (Houston, Texas). The SPEEDSTAR™ MVD control circuitry is suitable for indoor or outdoor use and comes standard with a visible fused disconnect switch, precharge circuitry, and sine wave output filter (e.g., integral sine wave filter, ISWF) tailored for control and protection of high-horsepower ESPs. The SPEEDSTAR™ MVD control circuitry can include a plug-and-play sine wave output filter, a multilevel PWM inverter output, a 0.95 power factor, programmable load reduction (e.g., soft- stall function), speed control circuitry to maintain constant load or pressure, rocking start (e.g., for stuck pumps resulting from scale, sand, etc.), a utility power receptacle, an acquisition system for the PHOEN IX™ monitoring system, a site communication box to support surveillance and control service, a speed control potentiometer. The SPEEDSTAR™ MVD control circuitry can optionally interface with the UNICONN™ motor controller, which may provide some of the foregoing functionality.

[0061] In the example of Fig. 2, the VSD unit 270 is shown along with a plot of a sine wave (e.g., achieved via a sine wave filter that includes a capacitor and a reactor), responsiveness to vibration, responsiveness to temperature and as being managed to reduce mean time between failures (MTBFs). The VSD unit 270 may be rated with an ESP to provide for about 40,000 hours (5 years) of operation at a temperature of about 50 degrees C with about a 100 percent load. The VSD unit 270 may include surge and lightening protection (e.g., one protection circuit per phase). As to leg-ground monitoring or water intrusion monitoring, such types of monitoring can indicate whether corrosion is or has occurred. Further monitoring of power quality from a supply, to a motor, at a motor, may occur by one or more circuits or features of a controller.

[0062] Overall system efficiency can affect power supply from the utility or generator. As described herein, monitoring of ITHD, VTHD, PF and overall efficiency may occur (e.g., surface measurements). Such surface measurements may be analyzed in separately or optionally in conjunction with a pump curve. VSD unit related surface readings (e.g., at an input to a VSD unit) can optionally be input to an economics model. For example, the higher the PF and therefore efficiency (e.g., by running an ESP at a higher frequency and at close to about a 100% load), the less harmonics current (lower ITHD) sensed by the power supply. In such an example, well operations can experience less loses and thereby lower energy costs for the same load.

[0063] While the example of Fig. 2 shows an ESP with centrifugal pump stages, another type of ESP may be controlled. For example, an ESP may include a hydraulic diaphragm electric submersible pump (HDESP), which is a positive- displacement, double-acting diaphragm pump with a downhole motor. HDESPs find use in low-liquid-rate coalbed methane and other oil and gas shallow wells that require artificial lift to remove water from the wellbore. A HDESP can be set above or below the perforations and run in wells that are, for example, less than about 750 m (e.g., about 2,500 feet) deep and that produce less than about 200 barrels per day. HDESPs may handle a wide variety of fluids and, for example, up to about 2% sand, coal, fines and H2S/CO2. As an example, a pump may be a piston pump, for example, with a linear motor that drives a piston in a reciprocating motion.

[0064] As an example, an ESP may include a REDA™ HOTLINE™ high- temperature ESP motor. Such a motor may be suitable for implementation in a thermal recovery heavy oil production system, such as, for example, SAGD system or other steam-flooding system.

[0065] As an example, an ESP motor can include a three-phase squirrel cage with two-pole induction. As an example, an ESP motor may include steel stator laminations that can help focus magnetic forces on rotors, for example, to help reduce energy loss. As an example, stator windings can include copper and insulation.

[0066] For connection to a power cable or motor lead extensions (MLEs), a motor may include a pothead. Such a pothead may, for example, provide for a tape- in connection with metal-to-metal seals (e.g., to provide a barrier against fluid entry). A motor may include one or more types of potheads or connection mechanisms. As an example, a pothead unit may be provided as a separate unit configured for connection, directly or indirectly, to a motor housing.

[0067] As an example, a motor may include dielectric oil (e.g., or dielectric oils), for example, that may help lubricant one or more bearings that support a shaft rotatable by the motor. A motor may be configured to include an oil reservoir, for example, in a base portion of a motor housing, which may allow oil to expand and contract with wide thermal cycles. As an example, a motor may include an oil filter to filter debris.

[0068] As an example, a motor housing can house stacked laminations with electrical windings extending through slots in the stacked laminations. The electrical windings may be formed from magnet wire that includes an electrical conductor and at least one polymeric dielectric insulator surrounding the electrical conductor. As an example, a polymeric insulation layer may include a single layer or multiple layers of dielectric tape that may be helically wrapped around an electrical conductor and that may be bonded to the electrical conductor (e.g., and to itself) through use of an adhesive.

[0069] Fig. 3 shows various examples of motor equipment. Such equipment includes various components (e.g., units, cables, plugs, etc.) where two or more of the components may be joined to form a joint or joints. As an example, one or more seal elements may be disposed at a joint to form a seal. As an example, a seal may be an internal seal, for example, disposed within a piece of equipment. As an example, a seal may be at a location that may be exposed to an external

environment, for example, an environment exposed to well fluid(s).

[0070] As shown in Fig. 3, a pothead unit 301 includes opposing ends 302 and 304 and a through bore, for example, defined by a bore wall 305. As shown, the ends 302 and 304 may include flanges configured for connection to respective other units (e.g., a protector unit at the end 302 and a motor unit at the end 304). As an example, the pothead 301 may be part of a pump (e.g., an ESP, etc.). [0071] In the example of Fig. 3, the pothead unit 301 includes cable passages 307-1 , 307-2 and 307-3 (e.g., cable connector sockets) configured for receipt of cable connectors 316-1 , 316-2 and 316-3 of respective cables 314-1 , 314-2 and 314- 3. As shown, the pothead unit 301 can include test ports 309-1 , 309-2 and 309-3, for example, to introduce fluid to test respective seals (e.g., seal elements, seating of seal elements, etc.) for plug portions of the cable connectors 316-1 , 316-2 and 316-3 as received in the cable passages 307-1 , 307-2 and 307-3 (e.g., cable connector sockets). As shown, the cable connectors 316-1 , 316-2 and 316-3 can include test ports 319-1 , 319-2 and 319-3, for example, to introduce fluid to test respective seals (e.g., seal elements, seating of seal elements, etc.) for respective cable portions of the cables 314-1 , 314-2 and 314-3 as received in the cable connectors 316-1 , 316-2 and 316-3. As an example, one or more seal elements may be disposed in a test port, for example, fitted in a test port and/or fitted on a test port plug (e.g., optionally about a shaft portion or extension of a plug, etc.). In such an example, one or more seals formed may seal a region of a component or components from an external environment in which the component or components are located.

[0072] As an example, the cables 314-1 , 314-2 and 314-3 and/or the cable connectors 316-1 , 316-2 and 316-3 may include one or more polymers. For example, a cable may include polymer insulation while a cable connector may include polymer insulation, a polymer component (e.g., a bushing), etc. As an example, the cables 314-1 , 314-2 and 314-3 may be coupled to a single larger cable. The single larger cable may extend to a connector end for connection to a power source or, for example, equipment intermediate the cable and a power source (e.g., an electrical filter unit, etc.). As an example, a power source may be a VSD unit that provides three-phase power for operation of a motor.

[0073] Fig. 3 also shows a pothead unit 320 that includes a socket 321 . As an example, a cable 322 may include a plug 324 that can couple to the socket 321 of the pothead unit 320. In such an example, the cable 322 may include one or more conductors 326. As an example, a cable may include at least one fiber optic cable or one or more other types of cables. As an example, one or more seal elements may be implemented to form a seal, for example, between a portion of the socket 321 and a portion of the plug 324 and/or between a portion of the cable 322 and a portion of the plug 324. [0074] Additionally, Fig. 3 shows a perspective cut-away view of an example of a motor assembly 340 (e.g., a pump motor) that includes a power cable 344 (e.g., MLEs, etc.) to supply energy, a shaft 350, a housing 360 that may be made of multiple components (e.g., multiple units joined to form the housing 360), stacked laminations 380, windings 370 of wire (e.g., magnet wire) and a rotor 390 coupled to the shaft 350 (e.g., rotatably driven by energizing the windings 370).

[0075] As shown, the shaft 350 may be fitted with a coupling 352 to couple the shaft to another shaft. A coupling may include, for example, splines that engage splines of one or more shafts. The shaft 350 may be supported by bearings 354-1 , 354-2, 354-3, etc. disposed in the housing 360.

[0076] As shown, the housing 360 includes opposing axial ends 362 and 364 with a substantially cylindrical outer surface 365 extending therebetween. The outer surface 365 can include one or more sealable openings for passage of oil (e.g., dielectric oil), for example, to lubricate the bearings and to protect various components of the motor assembly 340. As an example, the motor assembly 340 may include one or more sealable cavities. For example, a passage 366 allows for passage of one or more conductors of the cable 344 (e.g., or cables) to a motor cavity 367 of the motor assembly 340 where the motor cavity 367 may be a sealable cavity. As shown, the motor cavity 367 houses the windings 370 and the laminations 380. As an example, an individual winding may include a plurality of conductors (e.g., magnet wires). For example, a cross-section 372 of an individual winding may reveal a plurality of conductors that are disposed in a matrix (e.g., of material or materials) or otherwise bound together (e.g., by a material or materials). In the example of Fig. 3, the motor housing 360 includes an oil reservoir 368, for example, that may include one or more passages (e.g., a sealable external passage and a passage to the motor cavity 367) for passage of oil. In the example of Fig. 3, passages 369-1 and 369-2 are shown along with respective plugs 349-1 and 349-2. As an example, one or more seal elements may be disposed in each of the passages 369-1 and 369-2, for example, fitted in each of the passages 369-1 and 369-2 and/or fitted on each of the plugs 349-1 and 349-2. In such an example, one or more seals formed may seal a cavity of the motor housing 360 from an external environment in which the motor assembly 340 is located. As an example, the motor assembly 340 may be part of a pump (e.g., an ESP, etc.). [0077] As explained above, equipment may be placed in a geologic environment where such equipment may be subject to conditions associated with a function or functions of the equipment and/or be subject to conditions associated with the geologic environment. Equipment may experience conditions that are persistent (e.g., relatively constant), transient or a combination of both.

[0078] Fig. 4 shows an example of a seal element 420 and an example of a method 450. As shown, the method 450 can include a position block 452 for positioning a seal element, a position block 454 for positioning at least one component with respect to the seal element and a compression block 456 for compressing the seal element with respect to the at least one component.

[0079] As shown in Fig. 4, a component 410 includes a recess 412 defined by surfaces where the recess 412 can receive at least a portion of a seal element 420 that includes a first portion 422, a second portion 424 and an interface portion 425 where the first portion 422 includes a first polymeric material, the second portion 424 includes a second polymeric material and the interface portion 425 includes crosslinks between the first polymeric material and the second polymeric material.

[0080] As shown, a component 430 may be positioned with respect to the component 410 with the seal element 420 and force may be applied to compress the seal element 420 between the components 410 and 430, for example, to evacuate gas in one or more regions between the first portion 422 and the second portion 424 of the seal element 420. For example, where the seal element 420 includes a "dual" ring shape, compression of the seal element 420 may evacuate gas from annular spaces defined by the seal element 420 and a surface of the component 410 and the seal element 420 and a surface of the component 430.

[0081] Fig. 5 shows an example of a seal element 520 and an example of a method 550. As shown, the method 550 includes a provision block 552 for providing materials, a formation block 554 for forming materials into shapes and a crosslink block 556 for crosslinking the formed materials.

[0082] As shown in Fig. 5, materials 522 and 524 may be provided in a semisolid form, optionally a flowable form, a resin form, etc. Such materials may be formed via one or more processes such as, for example, an extrusion process. Such a process or subsequent process may bring the materials 522 and 524 into contact such that crosslinks may be formed between the materials 522 and 524. As an example, a co-extrusion process may include a hopper that feeds the material 522 to a screw and a hopper that feeds the material 524 to a screw where the materials 522 and 524 are subject to pressure, heat, etc. to form a melt where contact can occur between the materials 522 and 524 for purposes of crosslinking therebetween.

[0083] As an example, diamine crosslinking may use a blocked diamine. As an example, a seal element that includes diamine crosslinking may optionally be implemented in a relatively non-aqueous environment (e.g., due to capability of a diamine crosslink to be hydrated in aqueous media).

[0084] As an example, ionic crosslinking (e.g., dihydroxy crosslinking) may be implemented to cure FKMs, etc. Such crosslinking may include aromatic

nucleophilic substitution. As an example, one or more dihydroxy aromatic

compounds may be used as crosslinking agents where, for example, one or more quaternary phosphonium salts may be used to accelerate curing.

[0085] As an example, peroxide crosslinking may be implemented where crosslinking is achieved at least in part via a free radical mechanism. Such crosslink may be suitable for seal elements or portions thereof exposed to aqueous and/or non-aqueous electrolyte environments.

[0086] Some examples of unsaturated rubbers that can be cured by sulfur vulcanization include natural polyisoprene: cis-1 ,4-polyisoprene natural rubber (NR) and trans-1 ,4-polyisoprene gutta-percha; synthetic polyisoprene (IR for Isoprene Rubber); polybutadiene (BR for Butadiene Rubber); chloroprene rubber (CR), polychloroprene, neoprene, BAYPREN™ (Bayer AG, Germany), etc.; butyl rubber (copolymer of isobutylene and isoprene, MR) Halogenated butyl rubbers (chloro butyl rubber: CNR; bromo butyl rubber: BUR); styrene-butadiene Rubber (copolymer of styrene and butadiene, SBR); nitrile rubber (copolymer of butadiene and acrylonitrile, NBR), also called Buna N rubbers; and hydrogenated Nitrile Rubbers (HNBR) THERBAN™ (LANXESS Deutschland GmbH, Germany) and ZEPTOL™ (Zeon Chemicals L.P., Louisville, Kentucky).

[0087] As an example, an elastomeric material may be characterized as having a relatively low Young's modulus and a relatively high yield strain compared with other materials. As an example, an elastomeric polymer material may include amorphous polymers existing substantially above their glass transition temperature such that substantial segmental motion is possible.

[0088] Fig. 6 shows an example of a seal element 620 that includes a first portion 622 and a second portion 624 where crosslinking can occur to form an interface portion 625 between the portions 622 and 624. As an example, the first portion 622 and the second portion 624 may be contacted while in a viscous form where deformation can occur to form the interface portion 625, optionally with mixing and/or diffusion of materials that can form crosslinks. In the example of Fig. 6, various dimensions are shown that may characterize the seal element 620.

[0089] Fig. 7 shows an example of a seal element 720 that includes a first portion 722 and a second portion 724 where crosslinking can occur to form an interface portion 725 between the portions 722 and 724. As an example, the first portion 722 and the second portion 724 may be contacted while in a viscous form where deformation can occur to form the interface portion 725, optionally with mixing and/or diffusion of materials that can form crosslinks. In the example of Fig. 7, various dimensions are shown that may characterize the seal element 720.

[0090] Fig. 8 shows an example of a seal element 820 that includes a first portion 822, a second portion 824 and an interface portion 825 between the portions 822 and 824 that includes crosslinks that link the first portion 822 and the second portion 824. As an example, the seal element 820 may include a configuration such as, for example, the configuration of the seal element 620 or the configuration of the seal element 720.

[0091] As shown in Fig. 8, the seal element 820 may be subjected to force by a component 810 and a component 830 to deform the seal element 820 and to close a gap such that contact occurs between the seal element 820 and surfaces of the components 810 and 830. Such force may evacuate gas in one or more annular regions such that one or more pressure chambers are diminished or avoided.

[0092] Fig. 9 shows examples of seal elements 920-1 , 920-2, 920-3 and 920-4 that include a plurality of portions where at least one portion is crosslinked to at least two other portions. For example, a middle portion may be crosslinked to end portions.

[0093] As an example, a seal element may be elastic in that it can tolerate deformation such as, for example, elastic deformation. Elastic deformation may be characterized by, for example, a stress-strain curve, optionally via fitting of a line to determine a value for the Young's modulus. As an example, a seal element may include an average Young's modulus and individual Young's moduli that correspond to individual portions of the seal element. As an example, a seal element may experience plastic deformation. As an example, a portion of a seal element may exhibit elastic deformation (e.g., reversible) while another portion of a seal element exhibits plastic deformation (e.g., irreversible).

[0094] Fig. 10 shows examples of seal elements 1020-1 and 1020-2. As shown, seal elements 1020-1 and 1020-2 include portions of different sizes. Such portions may be characterized by one or more dimensions. In the examples of Fig. 10, an angle φ is also shown, which may be an angle defined by portions of a seal element. As an example, a center (e.g., centroid) of a portion of a seal element may define a line with a center (e.g., centroid) of another portion of a seal element. As an example, such a line may be substantially aligned with an axis of a seal element (e.g., substantially parallel; see, e.g., the seal element 1020-2) or at an angle to an axis of a seal element (e.g., not parallel; see, e.g., the seal element 1020-1 ).

[0095] Fig. 1 1 shows examples of the seal elements 1020-1 and 1020-2 with respect to equipment 1 101 and 1 105. As shown, the equipment 1 101 can include two components 1 102 and 1 104 that can compress the seal element 1020-1 therebetween where at least one of the components 1 102 and 1 104 includes a tapered (e.g., slanted) surface. As shown, the equipment 1 105 can include two components 1 106 and 1 108 that can compress the seal element 1020-2

therebetween where at least one of the components 1 106 and 1 108 includes a tapered (e.g., slanted) surface.

[0096] Fig. 12 shows an example of a seal element 1220 and an example of a method 1250. As shown, the method 1250 can include a position block 1252 for positioning a seal element, a position block 1254 for positioning at least one component with respect to the seal element and a compression block 1256 for compressing the seal element with respect to the at least one component.

[0097] As shown in Fig. 12, a component 1210 includes a recess 1212 defined by surfaces where the recess 1212 can receive at least a portion of a seal element 1220 that includes a first portion 1222, a second portion 1224 and an interface portion 1225 where the first portion 1222 includes a first polymeric material, the second portion 1224 includes a second polymeric material and the interface portion 1225 includes crosslinks between the first polymeric material and the second polymeric material.

[0098] As shown, a component 1230 may be positioned with respect to the component 1210 with the seal element 1220 and force may be applied to compress the seal element 1220 between the components 1210 and 1230, for example, to evacuate gas in one or more regions between the first portion 1222 and the second portion 1224 of the seal element 1220. For example, where the seal element 1220 includes a "dual" ring shape, compression of the seal element 1220 may evacuate gas from annular spaces defined by the seal element 1220 and a surface of the component 1210 and the seal element 1220 and a surface of the component 1230.

[0099] Fig. 13 shows examples of seal elements with respect to environmental conditions such as one or more of temperature (T) 1301 , pressure (P) 1305 and chemical environment (C) 1307. As shown, the conditions may differ with respect to one side of a seal element and another side of the seal element. As an example, a seal element can include a high temperature side and a low temperature side, a high pressure side and a low pressure side, a chemically inert side and a side that is less chemically inert. For example, a seal element may be formed of materials that differ to meet one or more environmental conditions where the materials may be crosslinked (e.g., at an interface therebetween).

[00100] Fig. 14 shows examples of equipment 1401 and 1405 with one or more seal elements 1420-1 , 1420-2 and 1420-3. As an example, the equipment 1401 can include matching threads 1402 that couple two components with the seal element 1420-1 positioned therebetween. As an example, the equipment 1405 can include a coupling mechanism 1406 (e.g., a bolt and nut, etc.) that can couple two

components with the one or more seal elements 1420-2 and 1420-3 positioned therebetween. In Fig. 14, the equipment 1401 and/or the equipment 1405 may be pump equipment, for example, of an ESP, etc. As an example, one or more of the seal elements 1420-1 , 1420-2 and 1420-3 may be a co-molded seal element.

[00101] Fig. 15 shows examples of equipment 1501 and 1505 with one or more seal elements 1520-1 , 1520-2, 1520-3 and 1520-4. As an example, the equipment 1501 can include a pothead for receipt of one or more cables where the pothead may be sealed with respect to one or more other components using the seal elements 1520-1 and 1520-2, etc. As an example, the equipment 1501 can include a housing where a seal element 1520-3 may be implemented to seal the housing (e.g., a cavity formed at least in part by the housing).

[00102] As an example, the equipment 1505 can include a coupling mechanism such as threads that can join two components. As an example, the seal element 1520-4 may be disposed between two components where the two components form a cavity such as, for example, a cavity of a motor, which may include a dielectric fluid. In such an example, the seal element 1520-4 may seal the cavity against intrusion by external fluid, which may be at a pressure higher than the dielectric fluid, the cavity, etc.

[00103] In Fig. 15, the equipment 1501 and/or the equipment 1505 may be pump equipment, for example, of an ESP, etc. As an example, one or more of the seal elements 1520-1 , 1520-2, 1520-3 and 1520-4 may be a co-molded seal element.

[00104] Fig. 16 shows an example of a system 1600 and an example of a method 1650. As shown, the system 1600 can include equipment 1601 that can supply electrical power to an electrically-driven pump 1610 disposed in an

environment 1605, for example, via one or more cables 1603. The pump 1610 can include various components and one or more co-molded seal elements 1620-1 , 1620-2, 1620-3, . . ., 1620-N. For example, consider a pump that includes at least one co-molded element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material.

[00105] As an example, the pump 1610 may be an electric submersible pump (ESP) that includes a motor that includes a housing; a cavity defined at least in part by the housing; a rotor disposed in the cavity; a stator disposed in the cavity; and at least one co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material.

[00106] As shown in Fig. 16, the method 1650 includes a supply block 1652 for supplying electrical power to a pump disposed in an environment, a seal block 1654 for sealing an interior cavity of the pump from the environment at least in part via a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material, and a pump block 1656 for pumping fluid via electrical power supplied to the pump. In such an example, the co-molded seal element may include a third portion and another interface portion. As an example, the fluid pumped may be in the environment and the co-molded seal element may seal the pump from the fluid.

[00107] As an example, a method can include supplying electrical power to an electric submersible pump disposed at a subsea location in a subsea environment; and sealing an interior cavity of the electric submersible pump from the subsea environment at least in part via a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the co- molded seal element may include a third portion and another interface portion.

[00108] As an example, equipment may include a test port in fluid

communication with a passage that extends to a location proximate to one or more seal elements. As an example, a plug may be provided to plug the test port. As an example, a weep hole may be provided to determine if fluid pressure applied via the test port results in fluid passing one or more seal elements. As an example, a co- molded seal element may be implemented to seal a test port (e.g., with respect to a test port plug, etc.). As an example, a test port may be a test port of equipment such as, for example, one or more of the pieces of equipment of Fig. 2, Fig. 3, etc.

[00109] As an example, a joint may be formed between two or more

components of a system. As an example, a joint may be formed between two or more components of a protector section of a system. As an example, a joint may be formed between two or more components of a motor section of a system. As an example, a joint may be formed between two or more components of an ESP where, for example, the ESP includes a pump section, a protector section and a motor section. As an example, an ESP may include a motor section coupled to a protector section coupled to a pump section where, for example, the motor section includes an electric motor configured to drive a shaft that extends through the protector section to the pump section to operatively drive a pump of the pump section.

[00110] As an example, a protector section may include one or more bellows, for example, one or more metal bellows. In such an example, a joint may exist between a bellows and another component of the protector section. As an example, a co-molded seal element may be included in the protector section, for example, to support the joint (e.g., structurally, sealably, etc.). [00111] As an example, to enhance sealing of an interface (e.g., a joint, etc.) between two components or parts, a gland may be implemented. As an example, an assembly may include a seal arrangement that includes a gland formed in part by a metal seal element, a polymer seal element, etc. (e.g., where a thin-wall may be defined with respect to a thick-wall and flanged joints such as, for example, those found in a bellows subassembly or a pothead of an ESP).

[00112] As an example, a joint may be an interface between two or more parts. As an example, a female part may be a housing of an ESP pump, motor, protector, gauge or other ESP-related component. Examples of male parts may include shaft tubes, breather tubes, bag frames, and various adapters.

[00113] As an example, a co-molded seal element can include a first portion that includes a first polymeric material; a second portion that includes a second polymeric material; and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the first polymeric material can include a first perfluoroelastomer and the second polymeric material can include a second perfluoroelastomer (e.g., a different

perfluoroelastomer). As an example, a first portion of a co-molded seal element may include a ring shape and a second portion of a co-molded seal element may include a ring shape where the two rings shapes are joined via crosslinks.

[00114] As an example, portions of a co-molded seal element may include crosslinks therebetween where the crosslinks include one or more polyamine crosslinks, aromatic nucleophilic substitution crosslinks, and free radical crosslinks.

[00115] As an example, a first portion of a co-molded seal element can include a first ring shape that includes a first ring diameter and a second portion of the co- molded seal element can include a second ring shape that includes a second ring diameter where, for the co-molded seal element, the first ring diameter is

approximately equal to the second ring diameter. In such an example, the first ring shape of the first portion can include a first cross-sectional diameter and the second ring shape of the second portion can include a second cross-sectional diameter where, for the co-molded seal element, the first cross-sectional diameter is approximately equal to the second cross-sectional diameter.

[00116] As an example, a co-molded seal element can include a first ring shape of a first portion and a second ring shape of a second portion where the first ring shape and the second ring shape include a common axis (e.g., consider ring shapes with central axes that are substantially aligned).

[00117] As an example, a co-molded seal element can include a first portion with a ring shape of a first ring diameter and a second portion with a ring shape of a second ring diameter where an interface portion that is a crosslinked portion of a material of the first portion and a material of the second portion includes a diameter approximately equal to the first ring diameter.

[00118] As an example, a co-molded seal element can include a first portion that includes a first ring shape that includes a first ring diameter and a second portion that includes a second ring shape that includes a second ring diameter where, for the co-molded seal element, the first ring diameter is less than the second ring diameter.

[00119] As an example, a co-molded seal element can include a first portion that includes a cross-sectional first diameter and a second portion that includes a cross-sectional second diameter where, for the co-molded seal element, the first diameter is approximately equal to the second diameter.

[00120] As an example, a co-molded seal element can include a first portion that includes a first diameter and a second portion that includes a second diameter where the first diameter is greater than the second diameter.

[00121] As an example, a pump can include a housing; a cavity defined at least in part by the housing; and a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the housing may be a housing that houses at least a portion of an electric motor for driving the pump to pump fluid. In such an example, the pump may include dielectric fluid in the cavity. For example, the housing may be an electric motor housing of an electric motor of the pump (e.g., to drive the pump for pumping fluid) and a cavity of the electric motor housing can include dielectric fluid therein. As an example, in a pump, a first portion of a co-molded seal element may be exposed to a cavity of a housing and a second portion of the co-molded seal element may be exposed to an exterior of the housing.

[00122] As an example, a pump may include a pothead where a co-molded seal contacts the pothead. As an example, a pump can include a housing that includes a tube portion that includes threads where a co-molded seal element is disposed adjacent to an axial end of the threads. As an example, a co-molded seal element may be disposed between two axial faces. As an example, a co-molded seal element may be disposed between two radial surfaces.

[00123] As an example, an electric submersible pump (ESP) motor can include a housing; a cavity defined at least in part by the housing; a rotor disposed in the cavity; a stator disposed in the cavity; and a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the first polymeric material may differ from the second polymeric material where crosslinking of the first polymeric material and the second polymeric material forms the crosslinks therebetween of the interface portion.

[00124] As an example, an ESP motor can include dielectric fluid in a cavity. As an example, dielectric fluid may be or include dielectric oil.

[00125] As an example, an ESP motor can include a first portion of a co- molded seal element that is exposed to a cavity of the ESP motor and a second portion of the co-molded seal element that is exposed to an exterior of the housing. As an example, an ESP motor can include a pothead where a co-molded seal contacts the pothead.

[00126] As an example, an ESP motor can include a housing that includes a tube portion that includes threads and a co-molded seal element that is disposed adjacent to an axial end of the threads.

[00127] As an example, an ESP motor can include a co-molded seal element that is disposed between two axial faces. As an example, an ESP motor can include a co-molded seal element that is disposed between two radial surfaces.

[00128] As an example, a method can include supplying electrical power to a pump disposed at a location in an environment; and sealing an interior cavity of the pump from the environment at least in part via a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the co-molded seal element can include a third portion and another interface portion. [00129] As an example, a method can include supplying electrical power to an electric submersible pump disposed at a subsea location in a subsea environment; and sealing an interior cavity of the electric submersible pump from the subsea environment at least in part via a co-molded seal element that includes a first portion that includes a first polymeric material, a second portion that includes a second polymeric material and an interface portion that includes crosslinks between the first polymeric material and the second polymeric material. In such an example, the co- molded seal element can include a third portion and another interface portion.

[00130] As an example, one or more methods described herein may include associated computer-readable storage media (CRM) blocks (e.g., that is non- transitory and not a carrier wave). Such blocks can include instructions suitable for execution by one or more processors (or cores) to instruct a computing device or system to perform one or more actions.

[00131] According to an embodiment, one or more computer-readable media may include computer-executable instructions to instruct a computing system to output information for controlling a process. For example, such instructions may provide for output to sensing process, an injection process, drilling process, an extraction process, an extrusion process, a pumping process, a heating process, etc.

[00132] Fig. 17 shows components of a computing system 1700 and a networked system 1710. The system 1700 includes one or more processors 1702, memory and/or storage components 1704, one or more input and/or output devices 1706 and a bus 1708. According to an embodiment, instructions may be stored in one or more computer-readable media (e.g., memory/storage components 1704). Such instructions may be read by one or more processors (e.g., the processor(s) 1702) via a communication bus (e.g., the bus 1708), which may be wired or wireless. The one or more processors may execute such instructions to implement (wholly or in part) one or more attributes (e.g., as part of a method). A user may view output from and interact with a process via an I/O device (e.g., the device 1706). According to an embodiment, a computer-readable medium may be a storage component such as a physical memory storage device, for example, a chip, a chip on a package, a memory card, etc.

[00133] According to an embodiment, components may be distributed, such as in the network system 1710. The network system 1710 includes components 1722- 1 , 1722-2, 1722-3, . . . 1722-N. For example, the components 1722-1 may include the processor(s) 1702 while the component(s) 1722-3 may include memory accessible by the processor(s) 1702. Further, the component(s) 1722-2 may include an I/O device for display and optionally interaction with a method. The network may be or include the Internet, an intranet, a cellular network, a satellite network, etc.

Conclusion

[00134] Although only a few examples have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the examples. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the following claims. In the claims, means- plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. § 1 12, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words "means for" together with an associated function.