E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/08 (2006.01) E21B 7/06 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2421414
In an apparatus for use in a borehole of a type comprising a rotatable shaft and a housing for rotatably supporting the shaft therein, a rotation restraining device associated with the housing for restraining its rotation. The device includes a plurality of rollers, each having an axis of rotation substantially perpendicular to a longitudinal axis of the housing and being oriented such that it is capable of rolling about its axis of rotation in response to a force exerted thereon substantially in the direction of the longitudinal axis, wherein at least two of the rollers are spaced about a circumference of the housing and axially along the housing so that the rollers are staggered axially along the housing. Alternately, the device includes a plurality of pistons, wherein at least two of the pistons are spaced about a circumference of the housing and axially along the housing so that the pistons are staggered axially along the housing.
Cargill Edward James
Restau Bryan James
Emery Jamieson Llp
Halliburton Energy Services Inc.
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