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 a case with holes made opposite to each of producing formation; valve bushings installed in the case opposite to each of its holes and designed to axially travel; the said bushings are equipped with spring circular fixing devices and clamped components; the facility also contains a control mechanism which is lowered into a well from a day surface and actuates the valve bushings to open or close the case holes, and packers. According to the invention outside the case opposite to each of its holes adjustable valves are installed. Each adjustable valve consists of a hollow cartridge wherein a bushing with a saddle is placed with a ball spring loaded from top to bottom; the said ball is placed on the bushing saddle. At that, adjustable valves are designed to run corresponding producing formations at exceeding of the set values of pressure by means of control of ball spring contraction force for each adjustable valve individually; and the clamped components of the valve bushings are made as their lower ends; while inside diameter of each of valve bushings decreases from top to bottom.

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.

2 dwg