FIELD: drilling.
SUBSTANCE: method includes rotating drilling column by a drive mounted at the surface, periodic lifting of the column, and its impact interaction with the well through drill bits and diamond tools. When the column lifts, the elements of the tool move in the radial direction thus spalling rock. The device has housing rigidly connected to the column and drill bits and diamond tool made of several members provided with working part and stem. The members are set in the housing for permitting rocking in radial direction.
EFFECT: enhanced efficiency.
2 cl, 5 dwg
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