E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01)
Patent
CA 2541541
An apparatus for keeping a down hole drilling tool vertically uses a pendulum. The pendulum restricts flow from outlets of drilling fluid chambers providing drilling fluid to centralizer activating pistons acting upon centralizer blades. When in a concentric pivotal position, all of the drilling fluid chambers are in a balanced pressure equilibrium. Should the outer housing deviate from a vertical orientation, the pendulum swings by force of gravity to assume an angularly offset pivotal position. This relieves the flow restriction on one or two of the outlets for one or two of the drilling fluid chambers resulting in an increased flow of fluid reducing hydraulic force acting upon one or two of the pistons causing one of the centralizers to at least partially retract toward the retracted position. Differential pressure from the other centralizers urges the outer housing back toward the vertical position until the pendulum again assumes the concentric pivotal position and the balanced pressure equilibrium in the drilling fluid chambers is restored.
Thompson Douglas B.
Wenzel Kenneth H.
LandOfFree
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