发明名称 |
Safety valve operating apparatus |
摘要 |
A hydraulic valve operating circuit for providing positive opening and closing of a downhole safety valve includes shut-off valves which prevent leakage of fuel to the outside environment if a leak should occur in the hydraulic lines which are connected to the hydraulic actuator of the downhole safety valve. A hydraulic control line is connected to the actuator of the safety valve through a normally-closed shut-off valve and the hydraulic control line is also connected to the actuator of the shut-off valve to hold both the shut-off valve and the downhole safety valve open when the hydraulic line is pressurized. Another valve moves to a position to direct the flow of fluid from the safety valve to an accumulator when the pressure in the control line falls below a predetermined value to insure that the downhole safety valve will close properly. The accumulator and the actuator control valves can be replaced by a single gate valve having a novel porting arrangement as shown in one embodiment of the present invention. The gate valve can be adapted for use with either a balanced or a nonbalanced downhole safety valve.
|
申请公布号 |
US4258786(A) |
申请公布日期 |
1981.03.31 |
申请号 |
US19790032973 |
申请日期 |
1979.04.24 |
申请人 |
FMC CORPORATION |
发明人 |
LOCHTE, GLEN E.;MILBERGER, LIONEL J. |
分类号 |
E21B34/16;(IPC1-7):F16K11/06;E21B43/00 |
主分类号 |
E21B34/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|