FAIL-SAFE ACTUATOR TO CONTROL A DOWNHOLE SAFETY VALVE

摘要

A wellbore formation fluid pump (30) and downhole safety valve system (20) includes a wellbore formation fluid pump (30) operable by a motor for lifting fluid entering the wellbore to the surface. A hydraulic fluid pump (10) is operably connected to the wellbore formation fluid pump (30). The hydraulic fluid pump (10) is configured to produce a selected fluid pressure sufficient to open a hydraulically operated wellbore device (20) when the wellbore formation fluid pump (30) is operated at at least a threshold rate. The hydraulic fluid pump (10) has a least one backflow feature (10C, 10D) to enable automatic stopping of operation of the hydraulically operated wellbore device (20) when the wellbore formation fluid pump (30) is operated below the threshold rate.