Wells – With motor for rotary or oscillating motion
Patent
1975-10-23
1977-04-05
Leppink, James A.
Wells
With motor for rotary or oscillating motion
173 73, 175103, E21B 4300, E21C 300
Patent
active
040156621
ABSTRACT:
A well tool comprising: a tubular housing adapted for fluid communicable connection with the lower end of a pipe string; a piston assembly carried by the housing for relative axial movement therein from a first to a second terminal position in response to fluid pressure communicated through the pipe string to a first pressure area on the piston assembly; a valve assembly carried by the housing and movable from a closed position to an opened position, in response to predetermined axial movement of the piston assembly, to permit the pipe string fluid pressure to be communicated to a second pressure area on the piston assembly opposing the first pressure area and forcing the piston assembly to return to its first terminal position; and a working member carried by the housing for movement in response to reciprocal movement of the piston assembly.
REFERENCES:
patent: 2813516 (1957-11-01), Dulaney
patent: 2873093 (1959-02-01), Hildebrandt et al.
patent: 2943603 (1960-07-01), Bassinger
patent: 3116781 (1964-01-01), Rugeley et al.
patent: 3313346 (1967-04-01), Cross
patent: 3361220 (1968-01-01), Brown
patent: 3722594 (1973-03-01), Smith et al.
patent: 3791447 (1974-02-01), Smith et al.
Brown Oil Tools, Inc.
Leppink James A.
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