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DETERMINING ANGULAR OFFSET BETWEEN GEOMAGNETIC AND GRAVITATIONAL FIELDS WHILE DRILLING WELLBORE
DETERMINING ANGULAR OFFSET BETWEEN GEOMAGNETIC AND GRAVITATIONAL FIELDS WHILE DRILLING WELLBORE
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机译:在钻探井眼时确定地磁和重力场之间的角偏移
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摘要
An apparatus (50) is directed relative to geomagnetic and gravitational fields of reference while advancing with rotation in a borehole (12) by determining angular position of the apparatus during the rotation and correcting the angular position of the apparatus relative to an offset of a toolface of the apparatus. To do the correction, a magnetic toolface of the apparatus during the rotation is determined based on geomagnetic readings of the apparatus in each of a plurality of divisions of the rotation relative to the geomagnetic field, and a gravitational toolface of the apparatus during the rotation is determined based on gravitational readings of the apparatus in each of the divisions of the rotation relative to the gravitational field. The offset of the toolface is then calculated as a difference between the magnetic toolface and the gravitational toolface. The corrected angular position can then be used in directing the apparatus.
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