Wellbore pump

Details Wellbore pump Wellbore pump

2006-11-14

2006-11-14

Thompson, Kenneth (Department: 3672)

Wells

Processes

Producing the well

C166S105000, C166S108000, C417S057000, C417S060000

Reexamination Certificate

active

07134503

ABSTRACT:
The wellbore pump of the present invention comprises a plunger having passage means which may be open or closed by a valve operated by a piston which is biased in the open position by a spring of selected strength such that the wellbore pressure may overcome the spring to close the valve when the accumulated hydrostatic pressure reaches a certain value. When the valve closes the reservoir pressure forces the plunger to the surface and causes the accumulated liquids to be pumped out of the wellbore. A stem extending from the top of the piston engages a top plate and causes the valve to open when the plunger reaches the top of the wellbore. Means is provided whereby the valve opens when it reaches the top of the wellbore and a latch may be provided to retain the plunger from returning to the bottom of the well.

REFERENCES:
patent: 4070134 (1978-01-01), Gramling
patent: 4889473 (1989-12-01), Krueger
patent: 4986727 (1991-01-01), Blanton
patent: 6637510 (2003-10-01), Lee
patent: 6851480 (2005-02-01), Swoyer et al.
patent: 2003/0141051 (2003-07-01), Abbott et al.

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