Artificial lift for oil wells

Details Artificial lift for oil wells Artificial lift for oil wells

1975-04-14

1976-03-02

Croyle, Carlton R.

Pumps

Drilled well free piston-type pump

Having condition or position responsive control of pump...

417 58, 417 86, 417392, 166 68, 166106, F04B 4712, F04B 2314, F04B 3500

Patent

active

039415104

ABSTRACT:
An apparatus for retrieving oil from a producing zone after the bottom hole pressure has decreased to such an extent that artificial lift is required for production. An accumulator is provided by casing sealed off with a packer, or an accumulation chamber located in the area of the casing where oil accumulates. The uppermost portion of the accumulator is vented to atmosphere to allow oil flow therein. A floating piston-type device may be located immediately above the accumulator with a bypass from the accumulator to the top of the floating piston. Pressure is subsequently applied through the vent line to the accumulator to force oil from the accumulator through a stinger tube above the floating piston and subsequently raise the oil and floating piston to the surface. Without the piston, a stinger tube and standing valve may be used to accumulate oil in the production tubing. The vent line may be located inside the production line with the upper casing being used as a pressure storage tank.

REFERENCES:
patent: 2391542 (1945-12-01), Benard
patent: 2704980 (1955-03-01), Vincent
patent: 3302581 (1967-02-01), Burch
patent: 3797968 (1974-03-01), Blfarr

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