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Determining Angular Offset Between Geomagnetic and Gravitational Fields While Drilling Wellbore

  • US 20180298743A1
  • Filed: 04/13/2017
  • Published: 10/18/2018
  • Est. Priority Date: 04/13/2017
  • Status: Active Grant
First Claim
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1. A method of operating an apparatus while advancing with rotation in a borehole, the method comprising:

  • determining angular position of the apparatus during the rotation in the borehole;

    correcting the angular position of the apparatus relative to a toolface offset of the apparatus by;

    determining a magnetic toolface of the apparatus during the rotation based on geomagnetic readings of the apparatus in each of a plurality of divisions of the rotation relative to the geomagnetic field of reference,determining a gravitational toolface of the apparatus during the rotation based on gravitational readings of the apparatus in each of the divisions of the rotation relative to the gravitational field of reference, andcalculating the toolface offset of the apparatus as a difference between the magnetic toolface and the gravitational toolface; and

    directing the apparatus in the borehole based on the corrected angular position.

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