MULTIHOLE WELL CONSTRUCTION METHOD Russian patent published in 2012 - IPC E21B7/08 E21B43/10 E21B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention includes main hole drilling, lowering and attachment of casing string and shank with openings for branch holes and lowering of assembly of drilling string bottom. At that well equipment is provided with electromagnetic system of oriented entry of drilling tool and shanks of small diameter into branch holes. Electromagnetic channel of communication with wellhead is formed, and, according to obtained data about installation angle of downhole motor diverter, diverter is installed in specified directional attitude for oriented entry in shank opening and for drilling from horizontal shaft shank opening. After drilling also oriented lowering of shank of smaller diameter with end curved to specified angle is performed. After drilling out and attachment of all the planned branch holes, lowering of tubing with self-contained well instruments arranged on tubing is performed. Well instruments provide measurement and transfer of bottom-hole data to the surface.

EFFECT: improving reliability and simplifying procedure of multihole well construction, also providing accurate relative orientation of main and branch holes.

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