MULTILATERAL WELL CONSTRUCTION METHOD Russian patent published in 2005 - IPC

FIELD: oil and gas production, particularly for oil and gas well cluster construction.

SUBSTANCE: method involves lowering pipe string having deflecting tool arranged at pipe string end into casing pipe to reach predetermined interval; lowering flexible shaft with cutter located at end thereof in pipe string to bring cutter into cooperation with deflecting tool; performing rotation and translation of flexible shaft with cutter which cuts openings in casing pipe as the result of cooperation thereof with deflecting tool and projects in formation for a given distance to form process channels; retrieving flexible shaft and cutter from the well; lowering flexible pipe with nozzle in pipe string up to reaching the casing pipe openings; supplying pressurized liquid through flexible pipe and nozzle along with performing translation thereof to lengthen process channels up to necessary lengths. After pipe string and deflecting tool lowering the deflecting tool is fixed relative casing pipe so that deflecting tool may rotate through predetermined angle each time the pipe string performs reciprocal motion. Then after lowering flexible shaft and cutter into pipe string casing pipe opening cutting and process channel forming operations are alternated with cutter removal from the opening and deflecting tool rotation through predetermined angle during pipe string reciprocation up to cycle termination. After flexible tube and nozzle lowering into pipe string process channel lengthening under the action of pressurized liquid and nozzle removal from casing pipe opening is alternated with rotation of deflecting tool through a given angle along with pipe string reciprocation up to cycle termination.

EFFECT: reduced number of trips and reduced material consumption.

2 dwg