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

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

SUBSTANCE: method involves lowering pipe string provided with whipstock connected to pipe string end in casing pipe within predetermined interval, wherein the whipstock is retained with respect to casing pipe and may rotate through predetermined angle; serially cutting windows in casing pipe by means of cutter secured to flexible shaft end with the use of whipstock to create technological channels in productive bed; removing flexible shaft; serially creating technological channels having necessary lengths with the use of flexible pipe having nozzle at end thereof; supplying liquid under pressure via the channels to create technological orifice row along casing pipe perimeter; removing flexible pipe from well; releasing whipstock from casing pipe; fixing whipstock in new location upstream or downstream of previous one; rotating whipstock through predetermined angle; cutting additional windows in casing pipe and creating additional technological channels in the same way within the boundaries of next productive reservoir; cutting next additional windows in casing pipe in above described way to create next additional technological channel row within next productive reservoirs to be developed.

EFFECT: possibility to penetrate different horizons arranged at different depths and, as a result, decreased costs due to elimination of additional well construction.

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