METHOD OF CONSTRUCTION OF MULTI-BOTTOM WELLS AND BAFFLE PLATE TO THIS END Russian patent published in 2014 - IPC E21B7/08 E21B29/06 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises mounting of locking assembly with deflector wedge with one deflection surface in the well main borehole constructed to design depth. Locking assembly is composed of hydromechanical anchor with seat to be locked below sidetracking interval. Prior to sidetracking, casing string is exposed by cutting the "opening". After sidetracking, deflector wedge is withdrawn from the well at disconnecting it from the locking assembly. Extra longer deflector wedge is lowered to interaction with hydromechanical anchor seat to prevent its turn. Prior to sidetracking, casing string is opened by cutting an extra "opening" with subsequent withdrawal of deflector wedge after construction of second side hole. Proposed device comprises deflector wedge to be lowered on the string and equipped with one deflecting surface connected by shear elements via adapter with locking assembly composed of hydromechanical anchor equipped with pipe corrugated in lengthwise direction and plugged at bottom by shoe and hydraulic locator arranged under said adapter. Note here that said locator is composed of the case with lengthwise channel communicated with said corrugated pipe and string. Said case houses the piston displacing axially at fluid overpressure and equipped with conical surfaces to act at pushers arranged regularly over the case perimeter and height to allow limited radial displacement outward to interaction with casing string walls. Note here that case top has groove to mate with adapter ledges at deflector wedge and extra deflector wedge to rule out their turn and to lock them at preset position.

EFFECT: sidetracking of two opposing boreholes from one level of existing wells, lower costs.

2 cl, 6 dwg