Surface controlled blade stabilizer

Details Surface controlled blade stabilizer Surface controlled blade stabilizer

E - Fixed Constructions

21

B

255/28

E21B 17/10 (2006.01) E21B 10/32 (2006.01) E21B 23/00 (2006.01) E21B 34/06 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1180692

Abstract of the Disclosure Drill string stabilizer apparatus, controllable to expand and retract entirely from the surface by control of drill string pressure, wherein increase of drill string pressure from the surface closes a valve to create a piston means which is moved down by drill string pressure to expand the stabilizer blades, said valve being opened and the piston moving upward upon reduction of drill string pressure to retract the sta- bilizer blades. Upward and downward movements of the piston and an actuator sleeve therebelow are controlled by a barrel cam acting between the housing and the actuator sleeve.

422107

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