Differential pressure operated free piston for lifting well flui

Details Differential pressure operated free piston for lifting well flui Differential pressure operated free piston for lifting well flui

1998-03-09

2000-04-04

Walberg, Teresa

Pumps

Drilled well free piston-type pump

Radially expansible piston portion controls pump and motor...

166372, F04B 4712, E21B 4300

Patent

active

060453354

ABSTRACT:
A differential pressure operated free piston for lifting well fluids from a subterranean reservoir to the surface through a well conduit. The free piston includes a piston body adapted for up and down sliding disposition within the conduit and a sealing assembly carried in a cylindrical space surrounding the piston body. The sealing assembly includes upper and lower juxtaposed sets of longitudinally separated cylindrical segments providing relatively smooth cylindrical surfaces on the exterior thereof for sliding and sealing contact with inner walls of the conduit, the upper and lower set of segments being radially oriented so that separations between the segments of the upper set and separations between the segments of the lower set are not aligned, providing a seal which, when pressure in the well conduit near the surface is subsequently reduced, sufficiently elevates the piston and well fluids thereabove to the surface.

REFERENCES:
patent: 1790450 (1931-01-01), Torrance
patent: 2674951 (1954-04-01), Zaba
patent: 2830540 (1958-04-01), Vincent
patent: 3273504 (1966-09-01), Lyles
patent: 4070134 (1978-01-01), Gramling
patent: 4363606 (1982-12-01), Kilgore
patent: 4531891 (1985-07-01), Coles, III
patent: 4923372 (1990-05-01), Ferguson et al.
patent: 5253713 (1993-10-01), Gregg et al.
patent: 5427504 (1995-06-01), Dinning et al.

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