The present invention relates to a control and supply unit for an actuating device of a choke, a valve, a blow-out preventer or some other device applied in the field of oil and natural gas production. Such a unit comprises at least an auxiliary power supply, which is especially rechargeable, and a connecting means used for an exchange of data and/or for the purpose of voltage supply. The actuating device is normally accommodated in a housing and the control and supply unit may be arranged in said housing as well. It may, however, be of advantage when the unit in question is implemented separately from the actuating device. This makes it more easily accessible, e.g. for the purpose of maintenance.

Such application devices can be arranged on the seabed, where they may also constitute part of a so-called tree. In particular in the case of electrically operated actuating devices for such application devices, a connecting means for connecting a voltage supply is required. In addition, the actuating device is normally controlled and monitored with the aid of a respective connecting means for an exchange of data. Data may be exchanged with a unit, which is arranged above the sea level, through a cable connection. Also the voltage supply may be effected through such a cable connection or, like the exchange of data, from a submarine control module.

Actuating devices and power supply devices of the type in question are described e.g. in PCT/EP2007/003307, PCT/EP2007/003308, PCT/EP2007/004793, PCT/EP2003/09696, PCT/EP 2009/008249.

It is the object of the present invention to improve a control and supply unit of the type specified at the beginning in such a way that the connecting means is not directly in contact with a respective cable connection, but that such a connection is established at a location which is more remote from the connecting means with the respective sensitive above- mentioned components.

This object is achieved by the features of claim 1. In particular, the connecting means is connected via a cable connection to a separate plug connection module arranged on the actuating device. This plug connection module serves to directly connect thereto a respective external cable connection used for transmitting electric power or for an exchange of data.

Due to the fact that the plug connection module is separated from the rest of the control and supply unit, the plug connection module can be arranged at an advantageous location at which it can be contacted from outside more easily and without damage being caused to the rest of the control and supply unit. In addition, due to the fact that the plug connection module is arranged on the actuating device, an arrangement is obtained that is more stable than an arrangement in which the respective plug connection module is arranged directly on the control and supply unit. Depending on the requirements to be satisfied, the plug connection module can be arranged at a suitable location and with a suitable orientation.

The cable connection is then used for connecting the plug connection module to the connecting means. A respective connection to the actuating device can be established easily by means of the control and supply unit. This control and supply unit can also satisfy relevant standards, such as the SMS (Subsea Instrumentation Interface Standardisation); these standards especially refer to the connection of control systems to a respective sensor of the actuating device.

The control and supply unit according to the present invention has a compact structural design and satisfies all the demands on an arrangement, especially a submarine arrangement, on the seabed or on a tree.

According to a simple embodiment of the plug connection module, said plug connection module may comprise a connection housing and at least one plug connection device. The connection housing serves to arrange the module directly on the actuating device.

Via the plug connection device, a suitable cable connection for supplying electric power and for an exchange of data can be connected. This cable connection is connected to the rest of the control and supply unit via the additional, above-mentioned cable connection. For easily transmitting electric power or data from plug connection module as well as from the rest of the control and supply unit to the actuating device, a coupling means for transmitting electric power and/or data can be implemented between the connection housing and the actuating device.

According to a simple and advantageous embodiment, the connection housing can be secured to the outer side of the housing of the actuating device, in particular such that it is releasable therefrom. It is, however, also possible that the connection housing is releasably secured to other parts of the actuating device or other units for mounting the actuating device on the seabed or on a tree.

Taking all this into account, a high variability of the arrangement of the plug connection module with respect to the actuating device and the rest of the control and supply unit is obtained.

According to a simple embodiment, the actuating device can have power supplied thereto directly via the plug connection module. At the same time, this plug connection module can also be used for supplying electric power to the rest of the control and supply unit, and in particular for supplying the respective electronic components or for recharging the rechargeable auxiliary power supply.

In this connection, the plug connection module can be connected to an external control module also directly on the seabed or to a remotely controlled vehicle. Such a remotely controlled vehicle is e.g. a so-called remote operated vehicle (ROV), or autonomous underwater vehicle (AUV), wherein in the following "ROV" can always be replaced by "AUV".

For reasons of redundancy, it is additionally of advantage when the actuating device has associated therewith two control and supply units and/or a plug connection module with two plug connection devices.

In connection with the ROV, it may additionally be of advantage, when the plug connection module is configured for connection of a vehicle voltage supply line and/or a vehicle data line for supply with electric power by and for an exchange of data with the ROV. In this way, it is not only possible to mechanically bridge or interrupt the connection between the control and supply unit and the actuating device through for example the ROV, but the supply can also be effected by for example the ROV instead of the control and supply unit.. Such an interruption of the connection between the control and supply unit and the actuating device can be effected when e.g. the control and supply unit is no longer able to supply and control the actuating device. In this case, a substitute external supply and control of the actuating device is effected by the ROV.

In the case of such an external supply and control, it will be particularly advantageous when the ROV itself is provided with suitable control and supply possibilities, or provides same by an external setup.

In this connection, it can also be regarded as advantageous when the unit comprises a unit housing which is releasably secured to the actuating device.

The unit housing may contain a plurality of means, and at least the communication interface, the auxiliary power supply and the motor control unit are arranged in the unit housing.

In order to satisfy especially level 2 of the SIIS regulation, the field bus can be a CAN bus. Such a bus is a standardized, real-time field bus for serial data transmission. Such a CAN bus is normally a two-wire bus and can be implemented with copper wires or through glass fibres.

Quite generally, it is also possible to transmit the respective data via the voltage supply line. According to the present invention, it is especially suggested that the connections for the field bus and the voltage supply line should be implemented as separate connections.

In order to simplify the structural design of the control and supply unit in its entirety, the communication interface and the voltage supply connection can be defined by a supply and communication assembly. The latter can be arranged as a separate unit within the unit housing and it can be connected to the other assemblies within said unit housing, such as the auxiliary power supply, the motor control unit or the like.

In order to simplify the respective connection between the supply and communication assembly and the other assemblies in the unit housing, the supply and communication as- sembly can comprise at least outputs for supplying electric power to the motor control unit, the auxiliary power supply, and/or at least a sensor unit of the actuating device.

It is also possible that the supply and communication assembly comprises connections for communication with and/or control of the auxiliary power supply, the motor control unit and/or the sensor unit of the actuating device. The bus connections in question can be adapted to various types of buses, such as a CAN bus, an RS485 bus or the like. This applies analogously also to the outputs for supplying electric power, which can provide different voltages, depending on the voltage required for the respective assembly supplied.

Furthermore, it can be considered to be of advantage when the supply and communication assembly is provided with a ground terminal connected at least to the auxiliary power supply and/or the motor control unit.

In addition, it will be advantageous when an inert gas atmosphere is provided in the unit housing. This inert gas atmosphere may e.g. be a nitrogen atmosphere under a pressure of 1 to 2 or more than 2 bar.

In this context, the connection in question can be a connection to a submarine control module for communication and/or voltage supply. It is, however, also possible to provide communication and a supply of voltage via separate connection lines to different control modules or to other control units, in particular to control units on the seabed.

In the following, an advantageous embodiment of the present invention will be explained in more detail on the basis of the figures added in the drawing, in which

Fig. 1 shows a perspective view of an actuating device for a choke with the control and supply unit according to the present invention, and

Fig. 2 shows a block diagram of the control and supply unit and of the actuating device.

Fig. 1 shows a perspective side view of an actuating device 2 for a choke 3, which is only shown in the form of a choke insert 22, as an application device 8. The actuating device 2 comprises at least a thread drive having a drive unit associated therewith, and in particular also a position sensor, all said components being arranged within a cylindrical housing. The choke insert 22 is longitudinally displaceable by means of the thread drive.

Other devices applied in the field of oil and natural gas production are e.g. a valve, a blowout preventer or other units of this type. Directly adjacent the actuating device 2, a control and supply unit 1 according to the present invention is arranged on a base plate 23. This control and supply unit 1 is of redundant design so that a second control and supply unit 12 is arranged directly adjacent said first unit and in parallel relationship therewith. The control and supply units 1 and 12, respectively, have a unit housing 9. Also this unit housing 9 is cylindrical.

The respective unit housings 9 are connected to a plug connection module 20 via a cable connection 27. When seen relative to the unit housings 9, this plug connection module 20 is arranged on the opposite side of the actuating device 2. The plug connection module 20 is releasably connected, via a connection housing 28, to an outer side of a respective housing 30 of the actuating device 2. Two plug connection devices 29 and 31 are arranged on an upper side of the connection housing 28. Analogously to the two unit housings 9, these plug connection devices are of redundant design, each of these plug connection devices being connected to a respective unit housing 9 via the cable connection 27.

The plug connection module 20 provided with the plug connection devices 29 and 31 serves, firstly, for connection to the control module 21 , which is indicated by a broken line in Fig. 1 and which is also arranged below the seal level and, in particular, on the seabed.

Secondly, the plug connection devices serve for connection to a remotely controllable vehicle, such as a remote operated vehicle (ROV). This remote operated vehicle can be used not only for transporting the whole unit shown in Fig. 1 and for conveying said unit to or removing it from its usage site, but also for bridging the control and supplying the actuating device by the control and supply unit. This will be done especially in cases where the respective control and supply unit is no longer in working order. For this purpose, the ROV may be provided with special units, cf. e.g. the supply and communication assembly 14 and the auxiliary power supply 4 or the motor control unit 13. In this way, the function of the control and supply unit 1 can be replaced by the ROV 32. The respective control and supply by the ROV corresponds in this connection to the control and supply through the control and supply unit as described in the following making reference e.g. to Fig. 2.

A respective electric connection between the plug connection module 20 and the actuating device 2 is established via a coupling means 24 between the connection housing 28 and the housing 30 of the actuating device 2. Also the control and the supply of the actuating device 2 by the control and supply units 1 and 12, respectively, is effected via this coupling means 24.

The broken line in Fig. 1 represents a connection to a control module 21 , which is also arranged below the seal level and, in particular, on the seabed.

The whole unit shown in Fig. 1 can be transported e.g. by an ROV and it can be conveyed to and removed from its usage site.

Fig. 2 shows a block diagram of the unit according to Fig. 1. Various assemblies are arranged within the respective unit housing 9 of the control and supply units 1 and 12. A first assembly is a supply and communication assembly 14. This supply and communication assembly 14 comprises the respective terminals and the connecting means 5 contacted via the cable connection 27 according to Fig. 1.

The connecting means 5 comprises a communication interface 6 and a voltage supply connection 7. The cable connection 27, which is connected to the voltage supply connection 7, is shown at said voltage supply connection. This cable connection 27 extends, cf. again Fig. 1 , e.g. up to the plug connection module 20.

The communication interface 6 is implemented as a field bus interface and is especially used for connecting a CAN bus thereto.

The voltage supply connection 7 is e.g. a d.c. voltage connection for a specific wattage, as for example 48W, and for a specific electric voltage or electric voltage range, as for example 20-27 VDC or the like. The supply and communication assembly 14 is provided with additional connections within the unit housing. These connections are e.g. two terminals 15, 16 for supplying electric power to an auxiliary power supply 4 and a sensor unit 25 of the actuating device 2. The sensor unit 25 may also comprise different sensors e.g. for position determination, temperature detection or the like.

In addition, the supply and communication assembly 14 is provided with bus connections 17 and 18 through which data are exchanged with the auxiliary power supply 4 or the sensor unit 25. Bus connection 17 is e.g. an RS485 bus connection and bus connection 18 is a CAN bus connection.

Via the bus connection 18 and through the auxiliary power supply 4, it is also possible to control the respective motor control unit 13. This motor control unit 13 is connected to respective motors, which are only shown schematically in Fig. 2 and which are identified by reference numeral 26.

The respective terminals 15 and 16 used for the purpose of electric supply can provide different wattages and voltages. In addition, the auxiliary power supply 4 can be connected to the supply terminal 16 of the supply and communication assembly 14 for the purpose of recharging and it can also be connected to the terminal 15, which is also associated with the sensor unit 25.

Finally, the supply and communication assembly 14 is also provided with a ground terminal 19, which is connected to both the auxiliary power supply 4 and the motor control unit 13.

Within the unit housing 9, an inert gas atmosphere may prevail, e.g. a dry nitrogen atmosphere with a pressure of 1 to 2 or more than 2 bar.

The control and supply unit according to the present invention serves to supply the actuating device with data as well as with electric power. The respective terminals are standardized so as to satisfy in particular the demands specified in SI IS. Making use of the control and supply unit, the actuating device can be operated and controlled easily. The control and supply unit comprises all the assemblies which are required for controlling the actuating device as well as for supplying electric power thereto. The auxiliary power supply is rechargeable and is especially used for compensating power shortages or shortfalls. Sufficient power is provided for the idling state of the respective motors of the actuating device as well as for operating said motors when they are in operation.

The control and supply unit 1 is mounted together with the actuating device 2 and can easily be transported together therewith, i.e. the whole unit shown in Fig. 1 can be transported e.g. by an ROV and retrieved for the purpose of maintenance or repair.

A special characteristic of the control and supply unit according to the present invention is that the control and supply unit is separate from the plug connection module 20, said plug connection module 20 being directly associated with the actuating device 2. The control and supply unit is connected to the plug connection module via a cable connection, which is adapted to be connected to the external control module 21 , cf. Fig. 1 , as well as to the ROV. This ROV serves to bridge the connection and control with or through the control and supply unit and replaces the latter, so that the supply of electric power to the actuating device 2 can be continued directly by the ROV and so that the actuating device 2 is controlled and supervised via a suitable exchange of data with the ROV .