Hydraulic actuation assembly

1. A pump device used in oil and gas wells for the hydraulic actuation of equipment, comprising:

a piston/cylinder unit and an electrical drive device, movably connected to the piston of the piston/cylinder unit for at least intermittent pump movement, wherein the pump device is capable of pumping fluid from a fluid feed line to the equipment through a supply line;

a pump valve located in the supply line and capable of controlling fluid flow from the pump to the equipment, wherein the pump valve is selectively lockable in an open position;

a bypass line connecting the fluid feed line upstream of the pump device to the supply line downstream of the pump device and the pump valve;

a bypass valve capable of controlling fluid flow from the feed line, through the bypass line, and to the equipment;

wherein the bypass valve is selectively lockable in an open position such that fluid is able to be communicated from the fluid feed line to the equipment through the bypass line;

wherein the pump and bypass valves are accessible for actuation by a remotely controlled vehicle via an access device for the vehicle for adjustment between the open and closed positions; and

wherein the access device comprises a hydraulic connection or the feed of hydraulic fluid from the remotely controlled vehicle.

2. The pump device according to claim 1 , wherein the hydraulic fluid is an inhibitor.

3. The pump device according to claim 1 , wherein the fluid feed line is branched from an inhibitor feed line.

4. The pump device according to claim 1 , wherein the supply line opens into a hydraulic line disposed in a riser of a well, which leads to a wellbore safety valve.

5. The pump device according to claim 1 , wherein the access device is arranged on a tree or comprises an access panel arranged on the pump device directly.

6. The pump device according to claim 1 , wherein the pump device is actuatable intermittently by remote control for maintaining a certain hydraulic pressure.

7. The pump device according to claim 1 , wherein the pump device is in fluid communication with a pressure accumulator.

8. The pump device according to claim 1 , wherein the pump device is constructed redundantly at least with regard to its drive device.

9. The pump device according to claim 1 , further comprising a rotatable cam plate with at least one axially protruding cam for the actuation of a safety valve.

10. An assembly for the hydraulic actuation of safety equipment, comprising:

a hydraulic pump disposed between a fluid feed line and a supply line, such that the pump is able to pump fluid to the safety equipment through the supply line;

a pump valve in the supply line downstream of the hydraulic pump and adjustable between open and closed positions for controlling hydraulic fluid flow through the supply line to the safety equipment;

a fluid source communicating with a bypass line connecting the fluid feed line upstream of the pump with the supply line downstream of the pump;

a bypass valve disposed in the bypass line and lockable between open and closed positions for controlling flow of other hydraulic fluid through the bypass line to the safety equipment through the supply line;

wherein the pump and bypass valves are accessible for actuation by a remotely controlled vehicle via an access device for the vehicle for adjustment between the open and closed positions; and

wherein the access device comprises a hydraulic connection or the feed of hydraulic fluid from the remotely controlled vehicle.

11. The assembly according to claim 10 further including a second fluid source communicating in fluid communication with the supply line; and an access connection disposed between the second fluid source and the supply line for providing additional hydraulic fluid to supply line.

12. A hydraulic actuation assembly for the hydraulic actuation of subsea equipment, including:

a subsea operable pump device arranged subsea between a fluid feed line and a supply line, the pump device output communicating with the supply line;

a bypass line;

an access device connected to the supply line downstream of the pump device, the access device including a pump valve and a bypass valve located downstream of the pump valve that is connectable with the bypass line;

the supply line downstream of the access device communicating with the subsea equipment, and flow though the access device to the subsea equipment being selectable between flow from the pump device or from the bypass line by adjustment of the pump valve and bypass valve; and

wherein the access device includes a hydraulic connection for the feed of hydraulic fluid from a remotely controlled vehicle to the supply line downstream of the pump valve.

13. The pump device of claim 12 , wherein the hydraulic fluid is an inhibitor.

14. The pump device of claim 12 , wherein the fluid feed line and the bypass line are branched from an inhibitor feed line upstream of the pump device.

15. The pump device of claim 12 , wherein the pump and bypass valves are accessible for actuation by a remotely controlled vehicle via the access device for adjustment between the open and closed positions.

16. The pump device of claim 12 , wherein the pump device is actuatable intermittently by remote control for maintaining a certain hydraulic pressure.

17. A method of hydraulically actuating subsea equipment, including:

arranging a subsea operable pump device subsea between a fluid feed line and a supply line, the pump device output communicating with the supply line;

connecting an access device to the supply line downstream of the pump device, the access device including a pump valve and a bypass valve located downstream of the pump valve;

connecting a bypass line to the bypass valve;

selecting flow through the access device to the subsea equipment to be from the pump device or from the bypass line by adjusting the pump valve and the bypass valve;

flowing fluid from the access device downstream to hydraulically actuate the subsea equipment;

connecting a remotely controlled vehicle to a hydraulic connection of the access device; and

feeding hydraulic fluid from the remotely controlled vehicle to the supply line downstream of the pump valve.

18. The method of claim 17 , wherein the hydraulic fluid is an inhibitor.

19. The method of claim 17 , wherein the fluid feed line and the bypass line are branched from an inhibitor feed line upstream of the pump device.

20. The method of claim 17 , further including adjusting the pump and bypass valves using a remotely controlled vehicle via the access device between the open and closed positions.

21. The method of claim 17 , further including intermittently actuating the pump device by remote control for maintaining a certain hydraulic pressure.