E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/12 (2006.01) E21B 43/16 (2006.01)
Patent
CA 2583629
Liquid is lifted from a well by a fluid displacement device moves within a production tubing and which maintains a seal against the production tubing during movement. The fluid displacement device is moved up and down within the production tubing between the well bottom and the earth surface by applying gas to create opposite relative pressure differentials across the fluid displacement device. Preferably the pressure differential is obtained from gas supplied from the well of supplied at natural formation pressure.
Credo Petroleum Corporation
Moffat & Co.
Reitz Donald D.
LandOfFree
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