STEERING TOOL WITH ECCENTRIC SLEEVE AND METHOD OF USE

摘要

A method for steering a well comprises disposing a first orienting assembly and a second orienting assembly spaced apart along a circular inner peripheral surface of a housing. An orienting sleeve is rotatably supported between the first orienting assembly and the second orienting assembly, The orienting sleeve has an angled bore therethrough, wherein a first longitudinal axis of the angled bore is inclined by a predetermined angle to a second longitudinal axis referenced to a cylindrical outer peripheral surface of the orienting sleeve. A rotatable steering shaft is rotatably supported along the angled bore to control rotatable steering shaft bending. The rotation of the first orienting assembly, the second orienting assembly, and the orienting sleeve is controllably adjusted to control the steering direction of the rotatable steering shaft.

主权项

1. A steerable well drilling apparatus comprising:
a tubular housing having a cylindrical inner peripheral surface; a first orienting assembly and a second orienting assembly spaced apart along the inner peripheral surface of the housing; an orienting sleeve rotatably supported between the first orienting assembly and the second orienting assembly, the orienting sleeve having an angled bore wherein a first longitudinal axis of the angled bore is inclined by a predetermined angle to a second longitudinal axis referenced to a cylindrical outer peripheral surface of the orienting sleeve; a rotatable steering shaft extending axially through and rotatably supported along the angled bore to control rotatable steering shaft bending, the rotatable steering shaft operably coupled to a drill bit for drilling a well; an orienting sleeve actuator operably coupled to the orienting sleeve to controllably rotate the orienting sleeve with respect to the housing; and a controller operatively coupled to the first orienting assembly, the second orienting assembly, and the orienting sleeve actuator to controllably adjust the steering direction of the rotatable steering shaft.