WELL MAGNETIC MEASUREMENTS DURING ROTATION AND METHODS OF THEIR USE Russian patent published in 2015 - IPC G01V3/26 

FIELD: instrumentation.

SUBSTANCE: invention relates to the magnetic measurements in wells during drilling. Essence of the invention is as follows: three-axis vector magnetometer is secured to the drilling string assembly. The three-axis vector magnetometer is made with possibility to measure three orthogonal components of the magnetic field. The drilling string assembly is rotated. The average value (B_TwR) of the full magnetic field during the drilling string assembly rotation is determined in accordance with the equation selected from the group comprising:

and

where each member B_xi, B_yi and B_zi corresponds to three orthogonal components of the magnetic fields.

EFFECT: possibility to estimate inclination and azimuth of the drilling string assemblies in the well bore during drilling, determination of presence of the external electromagnetic materials and distances to them, including deviation from the existing well, well crossing and check of the Instrument integrity.

20 cl, 3 dwg