| 摘要 |
A pressure equalizing subsurface safety valve (10) with a fluid injection system is provided. A fluid injection conduit (36) is connected from a source of injection fluid (37), such as at the earth's surface, to the subsurface safety valve. A fluid flowpath (38) is provided in the safety valve to transmit injection fluid from the fluid injection conduit to a longitudinal bore (14) of the safety valve. The injection fluids are introduced into the longitudinal bore to resist corrosion of or other damage to the safety valve. The fluid may be injected into the longitudinal bore through a single port, or through a plurality of ports. The fluid injection conduit may also be used to equalize pressure above and below a closure member (24) disposed within the safety valve prior to the opening of the closure member. |
