MULTILATERAL WELL CONSTRUCTION METHOD Russian patent published in 2008 - IPC E21B7/06 

FIELD: oil and gas production, particularly special apparatus for deflecting the boring.

SUBSTANCE: method involves lowering pipe string in casing pipe to predetermined interval, wherein pipe string has deflector connected to one end thereof; cutting casing pipe with cutter; serially creating technological channels having predetermined lengths along casing pipe perimeter with the use of flexible pipe terminating in nozzle, wherein casing pipe cutting is carried out before deflector lowering along the full perimeter thereof in two areas within the limits of one productive reservoir and deflector is fixed in casing pipe so that outlet orifices of technological channels are within one casing pipe cut; removing flexible pipe with nozzle from well; disconnecting deflector from casing pipe and securing it over or under initial location so that deflector may rotate through predetermined angle; creating additional technological channel row within the second casing pipe cut in the same way; removing pipe string with deflector from casing pipe; lowering technological pipe string in casing pipe and installing packer between technological channel rows so that packer is arranged in hole annuity between casing pipe and technological pipe string.

EFFECT: decreased material consumption and costs due to elimination of additional well.

2 dwg