Downhole pump unseating apparatus and method

Wells – Processes – Placing or shifting well part

Patent

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Details

166 68, 166109, 417450, E21B 4300, F04B 4700

Patent

active

050056514

ABSTRACT:
A fluid producing well has a downhole pump assembly located at a lower end of a tubing string for producing fluid from a pay zone. Some parts of the pump are affixed to a hold-down and the hold-down is telescopingly received in sealed relationship within a seating nipple. The seating nipple is connected to the tubing string. The hold-down and the pump assembly are connected to an apparatus in the form of a telescoping sleeve assembly by which the hold-down can be pushed uphole from a location that is below the seating nipple and forced to become unseated from the seating nipple. The apparatus includes an adaptor affixed at the lower end of the hold-down that extends downhole below the seating nipple. The telescoping apparatus is connected to engage the borehole and apply an uphole force on the adaptor in response to the tubing being lowered downhole. This action unseats the hold-down from the seating nipple, and pushes the pump uphole with a force that is equal to the weight of the tubing string that is supported from the lower end of the borehole.

REFERENCES:
patent: 1488662 (1924-04-01), Cater
patent: 1698797 (1929-01-01), Howe
patent: 1783615 (1930-12-01), Gunn et al.
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patent: 1983489 (1934-12-01), Penrod
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patent: 2590245 (1952-03-01), Harbison
patent: 2641197 (1953-06-01), Stone
patent: 2982355 (1961-05-01), Rodgers
patent: 4087212 (1978-05-01), Holder
patent: 4776401 (1988-10-01), Dollison

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