FIELD: drilling, namely, devices for driving inclined wells by turbine method.
SUBSTANCE: assembly of lower section of drilling column contains bit 1 with diameter DD, calibrator 2, with diameter DK, mounted on the shaft 3 of face engine, and localizer 4, having diameter DC, mounted on the body of face engine 5. Diameter of calibrator is determined from formula DK≤DC+L2(DD-DC)/(L1+L2), where L1 - distance from the end of bit to most remote point of working surface of calibrator, while L2 - distance between most remote point of working surface of calibrator and closest point of working surface of localizer.
EFFECT: improved technical and economic characteristics of drilling due to provision of stable operation of bit, increased durability of bits and face engines.
2 dwg
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