Method for drilling a wellbore using a bi-center drill bit

Details Method for drilling a wellbore using a bi-center drill bit Method for drilling a wellbore using a bi-center drill bit

2005-04-26

2005-04-26

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

With installing casing

C175S057000

Reexamination Certificate

active

06883622

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.

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European Search Report dated Nov. 6, 2003 (3 pgs.).

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