Borehole devices actuated by fluid pressure

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

E - Fixed Constructions

21

B

166/13

E21B 43/116 (2006.01) E21B 43/118 (2006.01) E21B 43/1185 (2006.01)

Patent

CA 1241269

BOREHOLE DEVICES ACTUATED BY FLUID PRESSURE ABSTRACT OF THE DISCLOSURE 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.

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