STIFF BOTTOMHOLE ASSEMBLY OF DRILL STRING WITH A DRILL BIT THAT DOESN'T CUT WELLBORE WALL

摘要

A stiff bottomhole assembly of drill string with a drill bit that doesnt cut wellbore wall comprises loaded drill pipes, calibrator, cross stabilizer, three-cone bit with pins, legss, roller cutters. Angle of inclination of the pin of drill bit to vertical is 57-60°, and bearing surface of the cross stabilizer has hard alloy plates in whole length of aligning elements.