| 摘要 |
A bottom hole assembly for drilling a well, comprising a non-magnetic tubing , an orienter, a motor, a bit fed with drilling fluid which passes through the no n- magnetic tubing, and a sensor package contained within the non-magnetic tubing, characterized by a drilling fluid flow tube passing through the non-magnetic tubing adjacent to the sensor package, and means for determining the relativ e position measurement between the non-magnetic tubing and the motor.
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