DEVICE FOR SIMULTANEOUS-SEPARATE OPERATION OF MULTYPAY WELL Russian patent published in 2008 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and can be used at operation of multypay wells for separate as well as for simultaneous working. The invention facilitates simplification of the design, reduction of costs for opening-closing of valves and also excludes back flow of well liquid into a bed during the well shutdown. The essence of the invention is as follows: the device contains a fitting with holes arranged opposite to each of producing beds pressure tight pressure tight separated from one another with packers. Valves are located outside the fitting opposite to each of its holes; each valve consists of a case with a side channel, of a spring, loaded from below a saddle, and installed pressure tight into the case, of a guiding pin and a ball, arranged on the saddle. A closed groove is made on the exterior surface of the saddle; the said groove consists of alternate short and long cuts, while the guiding pin is on one side rigidly fixed with the case, while on the other side it is placed in the closed groove of the saddle and is designed to move along the trajectories of alternate short and long cuts under the effect of the above hydraulic pressure. At that the valve is closed when the guiding pin is in the short cut of the closed groove of the saddle, and is open when the guiding pin is in the long cut of the closed groove of the saddle.

EFFECT: design simplification of device and reduction of costs for valve opening-closing as well as exclusion of back flow of well liquid into bed during well shut down.

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