| 摘要 |
PURPOSE: To guide an accurate amount of processing fluid into a pump chamber of a oil pump below the ground level by allowing 1st and 2nd seal means which hermetically seal a pump barrel inside a mounted nipple means, the pump barrel and the mounted nipple to form a hermetically sealed annular chamber together inside a 2nd annular space. CONSTITUTION: A underground pump 26 is hermetically sealed and contained inside a mounted nipple 24, and mounting sealing elements 28 and 30 form a hermetically sealed partition chamber 34 together with a pump barrel 32 and a generating tube 18. The annular seals 28 and 30 prevent fluid from leaking between the barrel 32 around the pump 26 and a mounted nipple part 24 of the tube 18. An outlet valve 42 is placed inside a pump piston 44 to carry fluid from a pump chamber 40 to the surface of a oil well through the tube 18. Thereby, an accurate amount of processing fluid is guided into the pump chamber of a oil pump below the ground level.
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