Borehole devices actuated by fluid pressure

Details Borehole devices actuated by fluid pressure Borehole devices actuated by fluid pressure

1984-11-27

1987-03-17

Leppink, James A.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

With wall engaging packer or anchor

166 551, 175 454, 175 456, E21B 4311

Patent

active

046500103

ABSTRACT:
An apparatus for actuating a tool downhole in a borehole. The apparatus includes a body; a port to admit fluid pressure into the body; and apparatus within the body in fluid pressure communication with the port for actuating the tool in response to (1) a fluid pressure level communicated through the port in excess of a first fluid pressure level greater than the hydrostatic pressure level, followed by (2) a decrease in the fluid pressure level communicated through the port from the first fluid pressure level to a second fluid pressure level less than the first fluid pressure level.

REFERENCES:
patent: 2749840 (1956-06-01), Babcock
patent: 2760408 (1956-08-01), Taylor
patent: 3011551 (1961-12-01), Young et al.
patent: 3040808 (1962-06-01), Schramm et al.
patent: 3071072 (1963-01-01), Castel et al.
patent: 3189094 (1965-06-01), Hyde
patent: 4266613 (1981-05-01), Boop
patent: 4361188 (1982-11-01), Russell
patent: 4554981 (1985-11-01), Davies

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