DEVICE FOR CUMULATIVE WELL DRILLING Russian patent published in 2011 - IPC E21B7/14 

FIELD: oil and gas production.

SUBSTANCE: device for cumulative well drilling consists of bore bit with case inside of which there is installed combustion chamber. A charge with explosive substance made with a cumulative recess is supplied into the combustion chamber. Explosive substances in charges are placed inside fragile, easily fractured or burned casings. Casings of explosive substances in charges can be made with corrugated surfaces. Also, cumulative recesses for charges are made at various angles to axis of the charge proper. Internal surface of the combustion chamber has ribs. The combustion chamber swivels at angle to axis of the bit or inside the bit there are made at least two combustion chambers connected with a rotating distributor of charges, or axis of the combustion chamber coincides with axis of the bit or at angle to axis of the bit, or is set off parallel to axis of the bit, or positioned at certain set off and at angle to bit axis.

EFFECT: increased drilling speed, simplification and reduction of cost of drilling process, supply of charges at various angles to bit axis and reliable explosion of charges.

7 cl, 16 dwg