Pumps – Drilled well free piston-type pump – Radially expansible piston portion controls pump and motor...
Patent
1980-06-30
1982-12-14
Croyle, Carlton R.
Pumps
Drilled well free piston-type pump
Radially expansible piston portion controls pump and motor...
92207, F04B 4712
Patent
active
043636063
ABSTRACT:
A free piston pump for use in a well for permitting gas to lift fluid to the well surface. The piston pump includes a body which supports a plurality of vertically and horizontally spaced piston segments which are sealingly engaged to form a piston. The segments are radially movable inwardly for allowing the retracted piston pump to move down the well conduit by gravity and are radially movable outwardly for engaging and sealing against the interior of the well conduit whereby gas under pressure lifts the piston and fluid thereabove to the surface. The segments are retracted when the pump reaches the top of the well and the segments are expanded when the pump reaches the bottom of the well. The segments include an inner arcuate surface and a tubular spring member is longitudinally positioned in the body and sealingly engages the inner surfaces. The segments are supported from the body by ribs and coacting cam surfaces are provided between the body and the ribs for providing retraction and expansion of the piston segments.
REFERENCES:
patent: 889275 (1908-06-01), Turner
patent: 2345482 (1944-03-01), Keith
patent: 2674951 (1954-04-01), Zaba
patent: 3249056 (1966-05-01), Lyles
patent: 3273504 (1966-09-01), Lyles
Croyle Carlton R.
Look Edward
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