SYSTEM FOR DRILLING MULTI-BARREL WELLS, WHICH ENABLES TO MINIMIZE NUMBER OF ROUND-TRIP OPERATIONS Russian patent published in 2019 - IPC E21B7/04 E21B7/08 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to completion of wells in oil and gas industry. Proposed method comprises feeding flushing well deflector coupled with orienting snap attachment mechanism into parent well cased with casing string and securing snapping cage attachment orienting mechanism. Flushing tool is connected to flushing borehole deflector and extracts it from parent wellbore, thereby opening detachable orienting connection of orienting snapping mechanism of attachment. Repair borehole deflector connected to the connection insulation tool is supplied to the parent borehole of the well, and the repair borehole deflector is connected to the orienting snatch attachment mechanism in the detachable orienting joint. Connection isolation tool is separated from the repair well deflector and moved to the side wellbore. After that, the connection isolation tool is removed back to the parent wellbore for repeated connection to the repair borehole deflector for extraction of the repair borehole deflector from the parent borehole.

EFFECT: technical result is reduced number of round-trip operations required for completion and improvement of productivity of parent and side wellbores of multi-barrel well.

10 cl, 10 dwg