Downhole pump with floating seal means

Details Downhole pump with floating seal means Downhole pump with floating seal means

1980-11-04

1983-06-07

Purser, Ernest R.

Wells

With eduction pump or plunger

With packer or plug

166187, 175321, E21B 2306

Patent

active

043866557

ABSTRACT:
A downhole tool, comprising, a first cylindrical body member having a longitudinally extending annular cavity disposed therein, and including a relief port for communicating the cavity with a space outside of the tool, the space being filled with a first fluid, a cylindrical extension member having a first end slidably received in the annular cavity and having a second end extending longitudinally from the annular cavity, and an annular floating seal, slidingly disposed in the annular cavity between the relief port and the first end of the cylindrical extension member, for sealingly engaging radially inner and outer surfaces of the annular cavity and for separating a second fluid in the annular cavity between the floating seal and said cylindrical extension member from the first fluid. The downhole tool including the described floating seal structure is utilized for the testing of subsurface formations.

REFERENCES:
patent: 2690224 (1954-09-01), Roberts
patent: 3083774 (1963-04-01), Peters et al.
patent: 3291219 (1966-12-01), Nutter
patent: 3319726 (1967-05-01), Brown
patent: 3439740 (1969-07-01), Conover
patent: 3566981 (1971-03-01), Love
patent: 3926254 (1975-12-01), Evans et al.
patent: 4145034 (1979-03-01), Dyer

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