Steering assembly for directional drilling of a wellbore
AssigneeTercel IP Ltd.
InventorsJeffrey B. Lasater, Ronald G. Earles, Jason Byrd
Life of this patent
Estimating the term…
Abstract
A steering assembly includes a housing having a longitudinal axis, a mandrel having a front connecting extremity and a rear connecting extremity, the mandrel passing through the housing and arranged in a first position coaxially to the longitudinal axis of the housing, a deflector device configured to exert a side force on the mandrel to offset the front connecting extremity of the mandrel from the longitudinal axis, and a tool face assembly configured to rotate the front connecting extremity of the mandrel in a desired direction.
Claims22
A steering assembly comprising:
- a housing having a longitudinal axis;
- a mandrel comprising a front connecting extremity and a rear connecting extremity, the mandrel passing through the housing and arranged in a first position coaxially to the longitudinal axis of the housing;
- a deflector device configured to exert a side force on the mandrel to offset the front connecting extremity of the mandrel from the longitudinal axis;
- and
- a tool face assembly configured to rotate the front connecting extremity of the mandrel in a desired direction,
- wherein the mandrel is rotatable relative to the housing, the deflector device and the tool face assembly.
A method for directionally drilling a wellbore comprising:
- providing in a drillstring a steering assembly comprising:
- a housing having a longitudinal axis;
- a mandrel comprising a front connecting extremity and a rear connecting extremity, the mandrel passing through the housing and arranged in a first position coaxially to the longitudinal axis of the housing;
- a deflector device for giving a side force to the mandrel such as to bring the front connecting extremity of the mandrel offset from the longitudinal axis;
- and
- a tool face assembly for rotating the front connecting extremity of the mandrel towards a desired direction,
- wherein the mandrel is rotatable relative to the housing, the deflector device and the tool face assembly;
- and
- operating the deflector device to change the magnitude of direction of drilling or operating the tool face assembly to change the direction of drilling or operating both of the deflector device and tool face assembly for changing the magnitude of direction of drilling and the direction of drilling.
A steering assembly comprising:
- a housing having a longitudinal axis;
- a mandrel comprising a front connecting extremity and a rear connecting extremity, wherein the mandrel extends through the housing and is arranged in a first position coaxially to the longitudinal axis;
- a deflector device configured to provide a side force to the mandrel within the housing such as to bring the front connecting extremity of the mandrel offset from the longitudinal axis;
- and
- a pivot stabilizer sub connected to the rear extremity of the mandrel.
A method for directionally drilling a wellbore comprising:
- providing in a drillstring a steering assembly comprising:
- a housing having a longitudinal axis;
- a mandrel comprising a front connecting extremity and a rear connecting extremity, wherein the mandrel extends through the housing and is arranged in a first position coaxially to the longitudinal axis;
- a deflector device configured to provide a side force to the mandrel within the housing such as to bring the front connecting extremity of the mandrel offset from the longitudinal axis;
- and
- a pivot stabilizer sub connected to the rear extremity of the mandrel;
- and
- operating the deflector device to change the magnitude of direction of drilling.
Dependencies are inferred from the claim text.