Wellhead assembly for hydraulic pumping system

Details Wellhead assembly for hydraulic pumping system Wellhead assembly for hydraulic pumping system

E - Fixed Constructions

21

B

E21B 33/03 (2006.01) E21B 43/12 (2006.01) F04B 47/04 (2006.01)

Patent

CA 2573489

A wellhead assembly to seal and suspend an in-casing hydraulic drive unit for a downhole pump, including one or more pressure-containing wellhead body members with a vertical bore and a production bore at its uppermost portion. A hydraulic pump hanger is retained and sealed in the vertical bore. The hydraulic pump hanger, formed in one or more parts, suspends and seals the hydraulic cylinder, includes a bore extending vertically therethrough, forms at least one hydraulic line to communicate with the hydraulic fluid supply lines, forms a hydraulic inlet port to each hydraulic line, and provides a check valve sealed in each hydraulic inlet port. The wellhead body member(s) includes a stem port aligned with each hydraulic inlet port, with a valve actuating stem sealed in each stem port to actuate each check valve between a normally closed position and an open position. The wellhead body member(s) also includes hydraulic injection port(s) formed to supply hydraulic fluid to each hydraulic inlet port.

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