Riserless modular subsea well intervention, method and apparatus
View Patent ↗A subsea well intervention system that permits dynamic disconnection from subsea well intervention equipment without removing any of the equipment during a drive-off condition is provided. The system includes a blowout preventer module operatively connected to a subsea tree and a subsea control system. The subsea control system is connected via electrical jumper to an ROV's tether management system. The subsea control system is connected via hydraulic jumpers to a multipurpose fluid-injection skid and one or more hydraulic accumulation banks. A fail-safe disconnect assembly is utilized with respect to the electrical jumper in order to provide easy removal during a drive-off condition.
1. A method for constructing a riserless subsea well intervention system, comprising:
establishing an electrical communication link between a surface control console and a subsea control system module by a remotely operated vehicle's tether management system; and
establishing a fluid connection between the subsea control system module and a subsea source for hydraulic power; and
establishing a second fluid connection between the subsea control system module and a hydraulic accumulator.
2. The method of claim 1 , further comprising providing a fluid connection between the subsea control system module and a multi-purpose fluid injection skid.
3. The method of claim 1 , wherein the source for hydraulic power is a multi-purpose fluid injection skid.
4. The method of claim 2 , wherein the fluid connection between the subsea control system module and the multi-purpose fluid injection skid remains connected when the surface control console is disconnected from the subsea well intervention system.
5. The method of claim 3 , wherein a fluid is pumped between the multi-purpose fluid injection skid and the'hydraulic accumulator.
6. The method of claim 3 , wherein the multi-purpose fluid injection skid and the hydraulic accumulator rest on the sea floor.
7. The method of claim 3 , wherein the multi-purpose fluid injection skid is self-powered.
8. The method of claim 7 , wherein the multi-purpose fluid injection skid is rechargeable by the remotely operated vehicle.
9. A riserless subsea well intervention system, comprising:
a subsea control system;
an electrical communication link between a surface control console and the subsea control system, wherein the electrical communication link is connected by a remotely operated vehicle's tether management system; and
a fluid connection between the subsea control system and a subsea source for hydraulic power, and
a second fluid connection between the subsea control system and a hydraulic accumulator.
10. The system of claim 9 , further comprising a fluid connection between the subsea control system and a multi-purpose fluid injection skid.
11. The system of claim 10 , further comprising a fluid connection between the multi-purpose fluid injection skid and the hydraulic accumulator.
12. The system of claim 10 , wherein the multi-purpose fluid injection skid and the hydraulic accumulator rest on the sea floor.
13. The system of claim 10 , wherein the multi-purpose fluid injection skid is self-powered.
14. The system of claim 13 , wherein the multi-purpose fluid injection skid is rechargeable.
15. The method of claim 2 , wherein the multi-purpose fluid injection skid is powered by the remotely operated vehicle.
16. The system of claim 10 , wherein the multi-purpose fluid injection skid is powered by the remotely operated vehicle.