| 摘要 |
A hydraulic control system, for controlling a retainer valve (19) in an underwater well test system, is contained in a housing (20) in the test string above the retainer valve (19). The control system and valve are operated by a surface control manifold (29) via control conduits (23,24) extending between the manifold (19) and control system housing (20). The system provides opening and closing and very quick closure of the retainer valve (19) by eliminating the requirement for closing pressure to be conducted through a long conduit from the surface and by utilizing well pressure to close the valve and lock the valve closed. The system includes, within the housing (20), two pilot valves (35,37), check valves (39,39a,39b) and a pressure accumulator (31). |
