Down hole well pumping apparatus and method

Details Down hole well pumping apparatus and method Down hole well pumping apparatus and method

1997-07-22

1999-06-29

Graysay, Tamara

Wells

With below and above ground modification

Eduction pump or plunger in well

166 68, 166105, 166108, 166109, 417 56, 417904, E21B 4300, E21B 2700

Patent

active

059154756

ABSTRACT:
A method and apparatus for pumping formation liquids provides a reciprocating down hole pump on the end of a coiled tubing string. In one embodiment, one fluid flow path is provided through the inside of the coiled tubing and another flow path is provided in an annulus between the coiled tubing and a, production string. In one embodiment, pressure delivered down the annulus to the pump moves a piston in a direction to move formation liquids upwardly to the surface. When pressure in the annulus is reduced, the hydrostatic weight of the pumped liquid moves the piston in a retracting direction to prepare for the next stroke. In other embodiments, the piston is moved downwardly, in retracting direction, by fluid pressure applied from the surface.

REFERENCES:
patent: 2921531 (1960-01-01), Brennan
patent: 2931304 (1960-04-01), Massey
patent: 3304871 (1967-02-01), Scroggins
patent: 3517741 (1970-06-01), Roeder
patent: 3653786 (1972-04-01), McArthur
patent: 3703926 (1972-11-01), Roeder
patent: 4268227 (1981-05-01), Roeder
patent: 4745969 (1988-05-01), Henderson

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