Downhole tool with ratchet

Details Downhole tool with ratchet Downhole tool with ratchet

1980-11-04

1983-02-08

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

166237, E21B 4312

Patent

active

043723870

ABSTRACT:
A downhole testing apparatus includes a pump assembly with an improved ratchet assembly for opening and closing a relief port of a discharge passage of a pump. The apparatus also includes an improved reciprocating piston.

REFERENCES:
patent: 2690224 (1954-09-01), Roberts
patent: 3083774 (1963-04-01), Peters et al.
patent: 3291219 (1966-12-01), Nutter
patent: 3311173 (1967-03-01), Henslee et al.
patent: 3319726 (1967-05-01), Brown
patent: 3439740 (1969-07-01), Conover
patent: 3566981 (1971-03-01), Love
patent: 3889750 (1975-06-01), Mullins
patent: 3926254 (1975-12-01), Evans et al.

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