Pumps – Motor driven – Fluid motor
Patent
1988-06-06
1989-11-14
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
F04B 4704
Patent
active
048803634
ABSTRACT:
Vertical reciprocation of the piston in a downhole well pump is hydraulically effected by surface-disposed power transfer apparatus comprising a driving fluid housing divided into first and second chambers by a drive piston reciprocably disposed therein, the first chamber being connected to the driving fluid chamber of the well pump by a driving fluid pipe. The pipe and the first housing chamber are filled with a first driving fluid. A driving fluid pump has an outlet connected to the second housing chamber, and an inlet connected to a source of a second driving fluid. During operation of the driving fluid pump a valved piping circuit associated therewith causes the pump to alternately force second driving fluid into the drive housing to force the well pump piston through its upstroke, and them permit the well pump piston to fall through its downstroke and responsively force second driving fluid out of the drive housing and back through the driving fluid pump to assist in driving the same during downward movement of the well pump piston.
REFERENCES:
patent: 3123007 (1964-03-01), Orr
patent: 4234295 (1980-11-01), Jensen
patent: 4600368 (1986-07-01), Sommer
John and Martin Holland and Associates
Smith Leonard E.
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