| 摘要 |
PCT No. PCT/US84/01935 Sec. 371 Date Aug. 5, 1986 Sec. 102(e) Date Aug. 5, 1986 PCT Filed Nov. 23, 1984 PCT Pub. No. WO86/03250 PCT Pub. Date Jun. 5, 1986.Method and means to pump a well with a hydraulically-driven downhole pump (15) as powered by a hydraulic surface unit (1) are disclosed, including a downhole filter assembly (71) and a flowline mounted oil leach (27) for supplying makeup oil to the surface unit.
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