E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01) E21B 7/06 (2006.01) E21B 23/04 (2006.01)
Patent
CA 2108916
A downhole adjustable blade stabilizer is disclosed for varying the position of stabilizer blades to provide an increased ability to control the direction of drilling. The adjustable blade stabilizer includes a plurality of blades mounted in an angled track to permit axial and radial movement of the blades. The blades are driven by a piston in response to a pressure differential created by a sufficient flow of drilling mud through the stabilizer. The stabilizer blades are retracted by a spring when the pressure differential is eliminated. A positioning piston limits blade extension to a desired position. The positioning piston moves in response to a command signal, and remains in place until a new command signal is received. By maintaining the positioning piston in a locked position, the position of the blades can be reset to the prior position after the loss of pressure differential. A measuring means is provided in association with the positioning piston to enable precise measurement of blade position.
Dewey Charles H.
Johnson Harold D.
Underwood Lance D.
Company Halliburton
Dewey Charles H.
Johnson Harold D.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Underwood Lance D.
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