FIELD: drilling, particularly to drill inclined well sections characterized by stable or slightly varying zenith angles.
SUBSTANCE: calibration means comprises bit 1 with DD diameter, conical calibrator 2 with DK diameter and centrator 4 with DC diameter. The bit 1 and calibrator 2 are mounted on downhole motor shaft 3. Centrator 4 is installed on bottom motor 5 body. Angle γ between generator of cone, which defines working calibrator surface and calibrator axis, as well as calibrator diameter are selected in dependence of bottom assembly geometry.
EFFECT: increased efficiency of well wall gauging.
1 dwg
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