Invention Grant
US07946361B2 Flow operated orienter and method of directional drilling using the flow operated orienter 有权
流量定向器和使用流动定向器定向钻孔的方法

Flow operated orienter and method of directional drilling using the flow operated orienter
Abstract:
A bottom hole assembly (BHA) for use in drilling a wellbore includes: a first mud motor having a stator and a rotor; a second mud motor having a stator and a rotor; a drill bit rotationally coupled to the second rotor and having a tool face and a longitudinal axis inclined relative to a longitudinal axis of the first mud motor; and a clutch. The clutch is operable to: rotationally couple the second stator to the first stator in a first mode at a first orientation of the tool face, rotationally couple the first rotor to the second stator in a second mode, change the first orientation to a second orientation by a predetermined increment, orient the tool face at the second orientation in an orienting mode, and shift among the modes in response to a change in flow rate of a fluid injected through the clutch and/or a change in weight exerted on the drill bit.
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