Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1976-02-04
1976-11-16
Leppink, James A.
Wells
With below and above ground modification
Eduction pump or plunger in well
166106, 417118, 417128, 417138, F04F 106, E31B 3303, E21B 4300
Patent
active
039918254
ABSTRACT:
The present invention is a secondary recovery system normally used for retrieving oil from the producing zone after the bottom hole pressure has decreased so that artificial lift is required for production. An accumulator is positioned in the lower portion of the casing where oil will accumulate from the producing zone. A standing valve is located in the bottom of the accumulator to prevent oil collected therein from leaving the accumulator. Above the accumulator is located a free floating piston having passageways therethrough. By proper control of the pressure line from the surface, oil is gradually moved through the free floating piston into a production tubing thereabove. Next, again in response to surface control, the free floating piston and oil collected thereabove is moved to the surface of the well by a rapid pressurization of the accumulator. Thereafter, pressure is exhausted from the accumulator allowing the piston to drop back to its lowermost position immediately above the accumulator. All movable parts in the well are retrievable from the surface without pulling the production tubing.
REFERENCES:
patent: 298990 (1884-05-01), Leedy
patent: 1596303 (1926-08-01), Redfield
patent: 3106170 (1963-10-01), Gray
patent: 3617152 (1971-11-01), Cummings
patent: 3894583 (1975-07-01), Morgan
patent: 3894814 (1975-07-01), Morgan
patent: 3941510 (1976-03-01), Morgan
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