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US 6,883,622 B2Granted
Method for drilling a wellbore using a bi-center drill bit
AssigneeSmith International, Inc.
InventorsTimothy P. Beaton, Thomas L. Young, David K. Truax
Life of this patent
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Abstract
A method is disclosed for drilling a wellbore. The method includes operating a turbine-type mud motor having a bi-center drill bit coupled to it, and applying an axial force to the bit which is selected so that the bit drills in a directionally stable manner. In one embodiment, the motor is a steerable motor operated to maintain a selected trajectory of the wellbore.
Claims4
A method for drilling a wellbore, comprising:
- operating a turbine-type mud motor selected from a bent housing turbine-type mud motor and a steerable turbine-type mud motor having a bi-center drill bit coupled thereto;
- and
- applying an axial force to the bit selected so that the bi-center drill bit drills in a directionally stable manner;
- and
- operating the turbine-type motor at a high rate of revolution so that the bi-center drill bit drills at greater than a selected rate of penetration.
2 more elements
A method for drilling a wellbore, comprising:
- operating a turbine-type mud motor selected from a bent housing turbine-type mud motor and a steerable turbine-type mud motor having a bi-center drill bit coupled thereto;
- and
- rotating the bi-center bit at a high rate of revolution such that the bit drills in a directionally stable manner.
An apparatus for drilling a wellbore, comprising:
- a turbine-type mud motor selected from one of a bent housing turbine-type mud motor and a steerable turbine-type mud motor coupled to an asymmetric type drill bit.
Dependencies are inferred from the claim text.