Downhole steering tool having a non-rotating bendable section

E - Fixed Constructions – 21 – B

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Details

E21B 7/04 (2006.01) E21B 7/08 (2006.01)

Patent

CA 2548171

A downhole steering tool is disclosed. The steering tool includes a rotatable shaft, a substantially non-rotating tool body deployed about the shaft, and a plurality of force application members deployed on the steering tool body. The steering tool further includes a bendable section deployed in the steering tool body. The bendable section is disposed to bend preferentially relative to the steering tool body under an applied bending load. The use of a steering tool body having a bendable section tends to advantageously reduce bending stresses in the steering tool body during use. Moreover, tools embodying this invention may be suitable for higher dogleg severity applications.

L'outil de direction pour fond de trou décrit comprend un axe rotatif, un corps d'outil quasiment fixe déployé autour de l'axe et une multitude d'éléments exerçant une charge qui sont déployés sur le corps de l'outil de direction. L'outil de direction comporte également une section flexible déployée dans le corps de l'outil. La section flexible est disposée de manière à fléchir, de préférence, par rapport au corps de l'outil de direction sous l'effet de l'application d'une charge de flexion. L'utilisation d'un corps d'outil de direction muni d'une section flexible tend à réduire avantageusement les efforts de flexion subis par le corps de l'outil en cours d'utilisation. Les outils visés par cette invention peuvent être utilisés dans des applications caractérisées par des contraintes en flexion plus importantes.

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