Adjustable stabiliser for directional drilling

Details Adjustable stabiliser for directional drilling Adjustable stabiliser for directional drilling

2006-10-31

2006-10-31

Neuder, William (Department: 3672)

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Axially spaced opposed bore wall engaging guides

C175S325500

Reexamination Certificate

active

07128170

ABSTRACT:
A stabiliser (10) has a body (12) having a through-bore (16). A mandrel (14), also having a through-bore (20), is axially slidable in the body bore to actuate and de-actuate the tool. A step (64) in the body defines annular chambers (102, 104) between the mandrel and body on either side of the step. A control piston (18) in the mandrel alternately directs drilling mud pumped under pressure along said body bore and mandrel bore to the chambers to drive the mandrel hydraulically to actuate and de-actuate the tool.The control piston has a through-bore (46) and is slidable in the mandrel bore against the force of a return spring (40) by drilling mud pressure from a low-pressure position to a pressure position. The pressure position is alternately one of an actuate position (a) and a de-actuate position (b), axially spaced along the mandrel bore from said actuate position.

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