Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1981-12-24
1984-11-06
Pate, III, William F.
Wells
With below and above ground modification
Eduction pump or plunger in well
166 84, 166 72, 92161, F04B 4704
Patent
active
044806850
ABSTRACT:
An oil well pumping apparatus which includes a submerged reciprocating pump mounted in a tubing arrangement communicating with the wellhead, a sucker rod string extending through the tubing arrangement and connected in driving relation with the pump, and a pumping tee and stuffing box arrangement mounted on the casing of the well at the wellhead and including a sealed drive rod arrangement in the stuffing box connected in driving relation to said sucker rod string, and a pump driving unit. The pump driving unit includes a hydraulic cylinder and support means including a gimbal arrangement for supporting the hydraulic cylinder over the stuffing box with the axis of the cylinder rod aligned with the axis of said stuffing box. A coupling means is provided for coupling the cylinder rod to the sealed drive rod arrangement. A hydraulic drive/control unit is coupled to said in/out fluid line for operating cycle consisting of a hydraulic power upstroke and a gravity power downstroke. An assist cylinder and accumulator combination are provided to counteract part of the weight of the rod string and thus reduce the workload on the hydraulic fluid pump.
REFERENCES:
patent: 3289791 (1966-12-01), Ulinski
patent: 3887196 (1975-06-01), Renfrou
patent: 4345766 (1982-08-01), Turanji
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