Downhole reciprocating plunger well pump system

Wells – With eduction pump or plunger – Having sediment trap or deflector

Patent

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Details

417372, 4174233, 4174238, 4174242, E21B 4300

Patent

active

059925175

ABSTRACT:
A multicylinder downhole reciprocating plunger pump includes a crankshaft supported on a frame for rotation about an axis generally parallel with the wellbore axis by a submersible electric motor or by a rotary drive rod extending within the well conduit connected to the pump. The pump frame includes spaced apart frame members which support a tubular discharge manifold which supports each cylinder for oscillatory movement in response to rotation of the crankshaft and respective plungers connected to respective crankthrows. Fluid inlet valves are mounted in the plungers and receive inlet fluid through respective crankshaft bearings for each plunger. Fluid discharge valves are retained in respective cylinder head portions by a removable tubular retainer members. Each cylinder includes a liner sleeve with a seal lip biased into engagement with the plunger by a garter spring member. A speed reduction gear drive may be configured to receive well fluid for flow therethrough and be pumped by cooperating meshed gears in the drive housing, for charging the pump inlet. The pump is adapted for waterwells and the speed reduction gear drive and crankshaft and plunger bearings are formed of materials which are water lubricable. The pump is particularly adapted for moderate to deep, low production waterwells.

REFERENCES:
patent: 4392792 (1983-07-01), Rogers

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