Introduction

The present invention relates to a petroleum well downhole tool string on a conveyor line (10) such as a composite rod (100) or a wireline (110). More specifically the invention is a mechanical services platform tool for being conveyed into place at a desired location in a petroleum well, the mechanical services platform comprising an anchor unit (60) for being anchored so as for forming a mechanical basis against the wall of the well. The mechanical platform tool will thus be anchored to exert reaction forces for an intervention tool operation in the well. A conveyor line (10) constituted by a composite fibre rod may be stiff enough to exert a pushing force onto the conveyed tool, while a conveyor line (10) constituted by a cable or wireline may pull only. A well tractor (200) may be arranged in combination with the mechanical services platform tool of the invention on the conveyor line (10) for facilitating the transport the mechanical services platform and an intervention tool into the well such as into horizontal portions of the well.

Purpose of the tool of the invention

The tools mounted as part of the mechanical services platform may generally be such tools that require a temporarily established but stable mechanical basis for exerting the reaction force for tools operations such as:

* A linear valve shifting for manipulating sliding sleeve valves to close or open, the sliding sleeves being valves in a tubing or casing;

* Fluid loss valve manipulation;

* Plug pulling;

* Side pocket mandrel valve installation, manipulating or pulling such as for gas lift valves;

* Axially translating milling tools for milling downhole components such as tubing or casing or stuck tools;

* Fishing for removing stuck tool strings or lost objects in the well;

* Straddle packer or extension pipe installation.

For tools indicated as the above it is desirable to have the following surface read out parameters:

- Linear actuator force from a force sensor,

- Position from a position sensor,

- Pressure and temperature from a pressure sensor and a thermometer near the actuator. Background art and problems related thereto

A well tractor may not provide the required stable mechanical basis for such tools. Well tractor arms and their wheels are designed for transport rather than anchoring. The force the wheel arms exert against the wall in the well must be adapted along its run along the internal wall of the well and requires spring action and responsiveness to be retracted when passing obstacles; the hydraulic pressure and the extension may have to be adapted along its path in the well. Thus the tractor arms must be designed for dynamic movement and will have a rather delicate mechanical structure. The mechanical structure of the tractor arms is usually not sufficient for forming a stable but temporary reaction force for some downhole tools such as a milling tool; a more rugged anchor device is required for a mechanical services platform which also requires a linear actuator for moving the intervention tool working along a rather restricted part of the well at a time. So a mechanical services platform tool with a high retention force such as the tool according to the invention is desirable. The US patent US82208541 Martinez et al., "Intervention tool with operational parameter sensors", describes an intervention tool for use inside a wellbore having an intervention module for performing an intervention operation downhole, and a drive electronics module in communication with the intervention module, the drive electronics module configured to control the intervention module. The tool of Martinez includes one or more sensors which measure at least one operational parameter of the intervention operation during the intervention operation. The intervention operation is said to be optimized based on the operational parameter.

The apparatus of Martinez is described in its claim 1 and illustrated in Fig. 1 (background art) as an apparatus comprising:

- an anchor assembly configured to anchor the apparatus at a position within the wellbore,

- an intervention accessory selected from the group consisting of a linear- or rotary-actuated intervention accessory,

- an actuator configured to cause linear or rotary motion of the intervention accessory relative to the anchor assembly,

- a downhole hydraulic power module configured to power the anchor assembly and / or the actuator, and comprising a sensor configured to measure, during the motion of the intervention accessory caused by the actuator, at least one of the following parameters:

- an amount of pressure generated by the downhole hydraulic power module; and

- a temperature of the downhole hydraulic power module and / or one or more components of the downhole hydraulic power module; and a drive electronics module configured to control the actuator to cause the motion and adjust control of the actuator during the motion based on the measured pressure and temperature.

Using the drive electronics module to control the actuator requires a digital processor with digital and analog inputs and digital outputs to control the motor with a motor drive circuit as well as analog inputs and digital outputs to control a hydraulic actuator, all arranged in the drive electronics module.

According to Martinez description, the telemetry module of the tool receives monitoring signals from the following units:

- the drive electronics,

- the hydraulic power unit,

- the anchor module,

- the linear actuator and

- the intervention module.

The drive electronics module receives sensor feedback signals from the following units:

- the hydraulic power unit,

- the anchor module,

- the linear actuator and

- the intervention module.

Further, the drive electronics comprises a control unit using the sensor feedback signals and returns control signals to the same units:

- the hydraulic power unit,

- the anchor module,

- the linear actuator and

- the intervention module.

This is illustrated in the attached drawing Figure 2. Martinez' tool thus has a drive electronics unit which has at least two roles: providing electrical power and receiving analog sensor signals and providing control signals, either digital or analog. At the same time, Martinez tool has a telemetry unit monitoring all other units.

The present invention is defined as follows, which provides a more clean architecture:

A petroleum well downhole mechanical services platform tool on a conveyor line (10) - said conveyor line (10) comprising a power and signal line (12, 11) for communicating with a surface system (160), and

- said power and signal line (11, 12) connected via a head assembly (20) to a communications module (30) further connected to

- a master electronics module (70) for controlling one or more of the following modules:

- a motor drive electronics module (40) connected to said power line (12) for driving a hydraulic power unit (50, 51, 52, 53, 54) , said hydraulic power unit (50) providing hydraulic power to one or more of :

- an anchor unit (60) for anchoring to a wall in said petroleum well,

- a linear actuator module (80) arranged for linearly actuating along the axis of said petroleum well a conveyed device (90, 901, 902, 100) such as a tool (90, 901, 902) and / or an instrument (100).

Instead of having a mix of analogue and digital monitoring and control functions assigned to the telemetry and the drive electronics module, and power and control functions assigned to the drive electronics module, the downhole telemetry module works as a telemetry module as such, and a novel master control unit is introduced. The master control unit is assigned to receive monitoring signals from the actuator module, the linear actuator and the intervention module, and to provide control signals to the actuator module, the linear actuator module, and the intervention module. The controlled units, comprising one or more of the anchor module, the linear actuator and the intervention module may each be provided with their own drive electronics.

Figure Captions

The drawing figures show illustrations of background art and the invention.

Fig. 1 is a structural overview of Martinez' tool mentioned above represented by the US patent US82208541 Martinez et al.

Fig. 2 is a redrawn system overview of the background art Martinez tool.

Fig. 3 is a system overview of the mechanical services platform tool of the invention, with an optional tractor unit (200) omitted between the telemetry unit (20) and the master control unit (70). An advantage over the background art is the feature that the master control unit of the present invention provides digital control signals to subordinate units such as the driver electronics units of the anchor module, the linear actuator module and the intervention tool module, and receives digital monitoring signals from one or more of the same, while the individual drive electronics units of the anchor module, the linear actuator module and the intervention module has a limited role of providing control and power signals to their respective HPU, linear actuator or intervention actuator, and for receiving sensor feedback from those, and providing monitoring signals to the superior master control unit (70). Thus the mechanical services platform tool's master control unit (70) of the invention communicates generally digitally with its subordinate modules, while communicating via the telemetry unit (30) via the rod or cable with the surface control unit (160).

Fig. 4 is a rough overview of the mechanical services platform tool of the invention. MSP modules: mechanical services platform modules. Conveyor line 10: with signal line 11. Power line 12 (preferably the same material line). Head Assembly 20 with Head Tension sensor 25 with el. and signal feed-through, digital master electronics module 70 supervises /controls each subordinate unit digitally, (new). Drive electronics module 40 (analog and digital, prior art) digitally connected to master el. module 70, analog connection to the motor of the HPU. Hydraulic power unit (50) with electronic HPU hydraulic controller (51) and HPU hydraulic block (52) and electric motor (53) driving hydraulic pump (54). Anchor unit (60 with electronic anchor hydraulic controller (61) and anchor hydraulic block (62) for anchor actuator (63) driving anchor elements (64). Linear hydraulic actuator 83 for linearly conveyed module 90. Anchor elements (64) for engagement with wall of borehole or casing or tubing. Linear actuator module 80 lin. act. hydr. controller 81 lin. act. hydr. block 82 linear actuator 83 [for rotary module 90]. Instead of or in addition to a rotary tool 94, one may have a linear tool (such as - a linear valve manipulating tool 902 for manipulating a valve or the like, and optionally also a logging tool 100 for measuring a condition or imaging a position of e.g. a valve. Linearly conveyed module 90 here a rotary module 901 with electrical rotary motor drive 9011 for electrical rotary motor 9013 for rotating a rotary tool 9014. Optional module 100 such as logging tool. Fig. 5 is a series called Fig. 5a - 5g of schematic illustrations of consecutive parts of the mechanical services platform tool of the invention.

Fig. 5a is a scheme of a release unit and a head tension unit (20). The release unit is the upper portion of the tool string connecting the mechanical services platform tool to the rod or cable conveying the entire tool string. The tool string may comprise a tractor unit (200) as shown in Fig. 4. 20: el: Release and Head T: Head Tension. In Rel.: R.c. : Release control 5W, R.a. :Release actuator 30W.

In Head T: 25: Tension cell: 0.05W connected to head tension transducer "(6)". grounded: HV return line. Fig. 5b is a scheme of a subsequent passthrough unit (17) further connected to a telemetry unit (30). 17: passthrough. 171: Passthrough control 5W. 30: telemetry. 13: tractor power. 14: Tool PS 20W. 15: tool power. 141: LV PS 5W to Archer telemetry modem ? W and Archer toolbus server ? W, further conneced to telemetry toolbus in telemtry unit 30. Sensor(s) + toobus client 2W connected between telemety toolbus and tool power 15. Fig. 5c: Tractor master unit and tractor drive unit.

In 210: tractor master. 212: Pump motor drive 30W. 213 Master Controller 5W. 211: LV PS 5W. 214: Archer Toolbus Client 2W. In 215: Hydraulic System. Hyd. pmp.: Hydraulic pump. Pump m.: pump motor 225W. HPC: High pressure compensator. Pt: Pressure transucer 0.05W. S:

Solenoid 15W. S: Solenoid 15W. 13: Tractor Power. TTb: Telemetry Toolbus. SC: Serial Chain. CAN. in 220: tractor drive: 201 HB: Hydraulic bus. Pt: pressure transducer 0.05W. S: solenoid 15W. S: solenoid 15W. 223: Motor 225W. 226: Opening piston. Pos Tr: Position transducer 0.1W. 221: Driver controller 5W. 222: Motor Driver 30W. 222: Motor Driver 30W. 223: Motor 225W. HS: Resolver/Hall sensors. DS: Drive system. HS: Hydraulic system. HVR: HVReturn. CAN. DSC:

Downhole serial chain. USC: Uphole serial chain. PTb: Passthrough toolbus.

Fig. 5d: Tractor high pressure unit and tractor sensors unit.

in 230: High Pressure Accumulator. HP Acc: high pressure accumulator.

In 240: Tractor sensors. El: electronics. 241: sensors 5W. LVPS: LVPS 5W. ATC: Archer Toolbus Client 2W. SS: Sensors. BhT: Borehole Temperature 1W. BhP: Borehole Pressure 1W. CC:

Compression Cell 0.05W. CCL

Fig. 5el: MSP Master control unit, MSP hydraulic unit, MSP anchor unit (above the MSP linear actuator unit)

in 50: MSP Hydraulic High Pressure Unit: 51, 52: hydraulic system. 53: Pump motor 225 W. Hydr. pmp. : Hydraulic pump. HPC: High pressure compensator. Pt: Pressure transducer 0.05W. S: Solenoid 15W S: Solenoid 15W.

In 70: MSP Master control unit. 40: Pump motor drive 30W. 71: master controller 5W. LVPS: PVPS 5W . ATC: Archer Toolbus Client 2W.

Fig. 5e2: (continued) MSP linear actuator unit with adaptor and conveyed intervention or logging tool. 81: Linear actuator controller. 82: Hydraulic system with PTr: Pressure transducer 0.05 W, S: Solenoid 15 W, S: Solenoid 15 W. 83: Anchor with LAP: Linear Anchor piston. PTr: Position transducer.

Fig. 5f: Example of MSP conveyed tool on MSP linear actuator: MSP conveyed milling tool. 9011: Mill motor driver 50W 9013: Drive System 2000 W. 9014, 9040: Milling head. Fig. 5g: Adaptor alternatives for passthrough.

Description of embodiments of the invention. A rough overview of the mechanical services platform tool of the invention is illustrated in Fig. 4. The release unit

Fig. 5a is a scheme of a release unit and a head tension unit (20), please also see Fig. 4. A release unit is usually required by the well operator for safety reasons; if a tool is malfunctioning or stuck in the well it must be releasable so as for at least the rod or cable to be retrieved, and provided with a fishing neck for subsequent fishing with a dedicated fishing tool. The release unit is in the cable head the upper portion of the tool string connecting the mechanical services platform tool to the rod or cable conveying the entire tool string. The tool string may comprise a tractor unit (200) as shown in Fig. 4. The release control in the cable head, please see Fig. 5a, may be controlled from the surface to control a release actuator upon command via the HV line from the surface. This function is independent of the telemetry modem and the toolbus server of Fig. 5b. Head tension

In an embodiment of the invention the tool comprises a head tension sensor (25), please see Fig. 5a. The output from the head tension sensor (25) is connected via a line through the passthrough unit to a sensor toolbus client in the telemetry unit, which provides a head tension signal to the toolbus server on the local telemetry toolbus. The toolbus server may transmit its measurement of the head tension via the telemetry modem to the surface.

The passthrough unit

The conveyor line (10) is provided with a power line (12) which may also serve as a signal line (11) or the conveyor line may comprise a separate signal line (11). In one embodiment the conveyor line (10) is a composite rod such as a fibre carbon rod (100) with a preferably centrally arranged copper conductor (12, 112) arranged either as a monoconductor or as coaxial conductors. One or more of the electrical conductors carry high voltage DC current. In a preferred embodiment the centrally arranged copper conductor is arranged for providing a stable 600 V voltage to the tool head (20) and preferably also throughout the tool string on the tractor power line. This should support a current strong enough to at least support a mill motor of 2000 W running at the innermost end of the tool string, such as a mill having a mill for removing scaling. In an embodiment of the invention a heptacable carrying seven conductors is employed. The passthrough unit (17) is arranged above the telemetry unit (30). Fig. 5b is a scheme of a subsequent passthrough unit (17) further connected to a telemetry unit (30). In a heptacable embodiment of the invention the passthrough unit caries six high voltage lines HV1, HV2, . . ., HV6 in addition to line HV7, and a return line called HV return. The six high voltage lines HV1 to HV6 and the high voltage line HV7 may be switched controlled by a passthrough control controlling relay coils for connecting to six plus one passthrough lines passl to pass6 and pass7. Opposite, the six high voltage lines HV1 to HV6 and the one high voltage line HV7 may be switched to connect to tractor power line (13). In this manner all the conductors of the heptacable may provide power combined. In the monocable arrangement HV1 - HV6 and bypass lines Passl - Pass6 are not present. The tractor power line (13) and the one or more bypass lines (Passl - Pass6, and Pass7) extend across the entire tool string to the lower connection where an adaptor for the monocable or heptacable with the bypass line (Pass7) continued and the tractor power (13) terminated. For an Archer adaptor the tool power line (15) is continued through that particular adapter.

The telemetry unit

In an embodiment of the invention a telemetry unit comprises a tool power supply (14) connected from the tractor power line (13) and providing power to a low power supply (141) to the common tool power line (15) throughout all units below. The tool power supply (14) in the telemetry cartridge (30), please see Fig. 5b, provides power at a lower level to the tool string internal power line (15) to the hydraulic pump motor driver (40) of the hydraulic high pressure unit (50), the low voltage power supply (15) which provides high voltage from the HV line (13) to the master controller (71) and the MSP archer toolbus client, please see Fig. 5el. Further the tool power line (15) provides power to the MSP anchor unit's (60) anchor controller (61) which controls the solenoid valves which control the anchor actuator (63). Likewise, the tool power line (15) provides voltage to the linear actuator controller (81) which controls the solenoids which govern the linear actuator piston (83) to extend or retract with the tool.

The tractor power line

The tractor power line (13) is an important structure which extends throughout the mechanical services platform tool of the invention, preferably including the tractor, and carries a high voltage, preferably 600 V DC. Since this is the same as the high voltage power provided on the HV conductor through the cable or rod, no high voltage power voltage converter is required in the downhole tool as such. In an embodiment of the invention the power line (12) is connected through the communications module (30), further connected as "tractor power line" (13) through the master electronics module (70) and providing power to the motor drive electronics module (40) , the tractor power line (13) is further connected through the hydraulic power unit (50) and said anchor unit (60) , the tractor power line (13) is connected through the linear actuator module (80) and providing power to the conveyed device (90, 901, 902, 100) such as a tool (90, 901, 902) and / or an instrument (100).

The tractor

In an embodiment of the invention a tractor (200) is arranged. The tractor (200) may be arranged between the telemetry unit (30) and the MSP master control unit (70), please see Fig. 4, please also see Fig. 5, wherein Figs. 5a, b, c, d, el, e2 are in sequence and may be terminated by either 5f (a milling tool) or by one of the adaptors shown in Fig. 5g. The tractor (200) comprises a tractor master unit (210), a tractor drive unit (220), a high pressure accumulator unit (230) and a tractor sensors unit (240). The tractor master unit (210) comprises a low voltage power supply (211) which provides electric power to the low-voltage electronics of the pump motor drive (212), the pump master controller (213) and the tractor toolbus client (214) which communicates with the tool-internal telemetry toolbus which extends from the toolbus server and throughout the toolstring and possibly through the archer adaptor. The tractor pump motor drive (212) controls the high voltage power to the tractor pump motor (216) which drives the tractor hydraulic pump (217) which is connected to the tractor high pressure line (201) which extends from the tractor hydraulic pump (217) through the tractor drive unit (220), to the tractor high pressure accumulator (230) and to the tractor sensors unit (240). The tractor sensors unit further comprises a sensor signal processor (241) which is connected to a borehole thermometer, a borehole pressure sensor, a compressor cell and a casing collar locator, and provides its data to a toolbus client connected to the toolbus. The tractor drive may in an embodiment comprise a tractor drive controller (221) which controls two sets of the following: a motor driver (222) supplied with power from the tool power line and providing power from the tractor power line (13) to a drive motor (223) which drives tractor drive wheels (224, not shown) on wheel arms (225, not shown) through a gear arrangement. The wheel arms (225) are extended and retracted by opening pistons (226) controlled by solenoids (227) controlled by the tractor drive controller (221) and energized by the hydraulic pressure line (201). The mechanical services platform

The mechanical services platform tool according to the invention is illustrated in Fig. 4 and further illustrated in Fig. 5. It is a petroleum well downhole mechanical services platform tool for being arranged and conveyed on a conveyor line (10). The conveyor line (10) comprises a power line (12) and a signal line (11) for communicating with a surface system (160), and the signal line (11) and said power line (12), here indicated as "HV7 / Tractor power", are connected via a head assembly (20) to the communications module (30), usually called a telemetry module (30). The signal line (11) is coupled via the power line (12) and read in and out via a telemetry modem, please see Fig. 5b. The power line (12) is further connected on the tractor power line (13) throughout the units beyond / below the telemetry unit (30). The tractor units illustrated in Figs. 5c and 5d are not the primary essential part of the mechanical services platform tool of the present invention, it is used for conveying the mechanical services platform along the well where gravity and or rod pushing or rod or cable pull alone is not sufficient. The mechanical services platform tool comprises, please see Fig. 5el, a master control unit (70), also called a master electronics module (70) comprising a Master Controller (71) for controlling one or more of the following modules:

- a motor drive electronics module (40) connected to said power line (13, 12) for driving a hydraulic power unit (50, 51, 52, 53, 54) , said hydraulic power unit (50) providing hydraulic power to one or more of

- an anchor unit (60) for anchoring to a wall in said petroleum well, or

- a linear actuator module (80) arranged for linearly actuating, along the axis of said petroleum well, a conveyed device (90, 901, 902, 100) such as a tool (90, 901, 902) and / or an instrument (100). The hydraulic power unit (50) comprises a pump motor (53), a hydraulic pump (54) and a high pressure compensator connected to a common hydraulic line (55). The common hydraulic line (55) extends from the hydraulic power unit (50), also called a hydraulic high pressure unit, to the anchor unit (60), and to the linear actuator (80), which on its hydraulically extendable piston (83) carries the conveyed tool.

In an embodiment of the invention the master control unit (70) and the hydraulic pressure unit (50) are arranged in separate compartments. The master control unit (70) which is a purely electronic unit may be arranged on a separate board. In an embodiment of the invention the hydraulic power unit (50) comprises an HPU electronic hydraulic controller (51) for controlling a HPU hydraulic block (52) connected to a HPU electric motor (53) for driving a HPU hydraulic pump (54), please see Fig. 5el. The pump motor driver (40) may be arranged with the high pressure unit (50). In an embodiment of the invention the master control unit (70) and the hydraulic high pressure unit (50) are arranged in a common

compartment.

In an embodiment of the invention, the tool's anchor unit (60) comprises an anchor hydraulic controller (61) for controlling an anchor hydraulic block (62) connected to an anchor actuator (63) driving anchor elements (64) arranged for contact with a wall in said petroleum well, such as the rock wall, casing inner wall, tubing, liner, valve interior, or even the inner wall of a drill pipe. The anchor is thus arranged for exerting a high retention force against axial translation and thus form a basis constituting a reaction force for the tool conveyed, such as the milling tool or the valve shifting tool. The anchor elements may comprise hydraulically driven arm elements with friction pads for engagement with the surrounding wall, and their mechanical design is not considered to further detail in this application.

In an embodiment of the invention the linear actuator module (80) comprises a linear actuator hydraulic controller (81) for controlling a linear actuator hydraulic block (82) connected to a linear actuator (83) arranged for linearly actuating along the axis of said petroleum well said conveyed device (90, 901, 902, 100).

In an embodiment of the invention the conveyed device (90, 901, 902, 100) comprises a rotary module (901) comprising a rotary motor drive (9011) for a rotary motor (9013) for rotating a rotary tool (9014). The rotary tool (9014) may comprise a milling head (9040).

In an embodiment of the invention the conveyed device (90, 901, 902, 100) comprises a linear shifting tool arranged for shifting the position of a shuttle in a linear valve so as for opening or closing the valve. This may be for instance the valve sleeve.