Surveying of boreholes using shortened non-magnetic collars

Details Surveying of boreholes using shortened non-magnetic collars Surveying of boreholes using shortened non-magnetic collars

E - Fixed Constructions

21

B

324/9

E21B 47/022 (2006.01) E21B 17/16 (2006.01)

Patent

CA 1225433

- 1 - Abstract Disclosed are methods and apparatus for surveying a borehole including use of a survey instrument for making gravitational measurements from which the inclination and highside angles of the instrument may be determined. Measurements of two components of the local magnetic field perpendicular to the longitudinal axis of the in- strument may be sensed with the instrument, and may be used to determine the azimuth angle of the instrument under the assumption that magnetic interference due to the pipe string in which the instrument is located lies solely along the longitudinal axis of the instrument. The accuracy of the azimuth determination may be enhanced by an iteration process. To the extent that the pipe string interference includes transverse field components at the instrument, the sensors of the instrument may be separated from such pipe string members by placing the instrument in non-magnetic material whose minimum length may be determined.

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