FACILITY FOR SIMULTANEOUS-SEPARATE OPERATION OF MULTI-HORIZON WELL Russian patent published in 2008 - IPC E21B43/14 E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: facility contains case with holes made opposite to each of producing formations pressure tight separated from each other with packers. Adjustable valves are secured outside to a sleeve opposite to each of its holes; the said valves are designed to operate the corresponding producing formations at specified values of pressure in them. Each adjustable valve consists of a hollow cartridge wherein a bushing with a saddle is placed and a ball spring loaded from top to bottom; the said ball is placed on the bushing saddle, while the bushing is designed to adjust contacting force of a ball spring. Inside the sleeve there is a nipple plugged from beneath; this nipple is equipped with side holes and gates. At that, side holes of the nipple are arranged opposite sleeve holes; the latter must be set in the "open" position. The gates are pressure tight installed opposite to holes of the sleeve and they must be set in the "closed" position.

EFFECT: facilitating selective movement of valve bushings at one lowering of control mechanism into well, excluding of back flow of well liquid into formation at moment of well shutdown; regulated withdrawal of well liquid form producing formations depending on pressure therein.

3 dwg