Wells – With eduction pump or plunger – With packer or plug
Patent
1986-10-27
1987-11-17
Novosad, Stephen J.
Wells
With eduction pump or plunger
With packer or plug
166127, 417395, E21B 33124, E21B 4312
Patent
active
047067462
ABSTRACT:
A downhole inflatable packer pump for use in a testing string. The pump includes an upper mandrel rotatably disposed in a case. The upper mandrel includes a pump cam with a cam slot thereon. A piston cavity is defined between the case and inner mandrel in which a single, sleeve-type piston is reciprocably disposed. A cam roller on the piston engages the cam slot, and as the inner mandrel rotates, the piston is reciprocated. A diaphragm sealingly separates the piston chamber from a pumping chamber. Inlet and outlet check valves with annular resilient lips allow fluid flow into the pumping chamber from the well annulus and out of the pumping chamber into an outlet chamber in communication with the lower portion of the testing string. The piston chamber is filled with a lubricating oil, and pumping action of the reciprocating pump piston causes movement of the oil which is transmitted to the pumping chamber through the diaphragm. An equalizing chamber allows equilization of hydrostatic pressures between the piston chamber and the well annulus. A pressure limited is included for limiting a pressure differential between the pumping chamber and the well annulus to a predetermined level. Fluid from the pumping chamber is not directly bypassed to the well annulus.
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Northstar Drillstem Testers, Ltd., tool string, shown on p. 11 of the Sep. 1, 1980, edition of Oilweek.
Beck Harold K.
White Kevin M.
Duzan James R.
Halliburton Company
Kennedy Neal R.
Neuder William P.
Novosad Stephen J.
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