DEVELOPMENT METHOD OF OIL MASSIVE DEPOSIT AND ADJUSTABLE WELL VALVE Russian patent published in 2012 - IPC E21B43/20 E21B34/08 

FIELD: oil and gas industry.

SUBSTANCE: method involves investigation of the bed properties, drilling of injection wells and branched production well with horizontal sections, pumping of displacing agent to injection wells and extraction of the product through production well. At that, two horizontal sections of production well are located one above the other in the range of one productive formation. Investigations of productive capacity of each of horizontal sections are performed; after that, pressure-adjustable valve with replaceable orifice in the through channel is installed between horizontal sections. Extraction from production well is performed with one pump installed above the valve with capacity higher than that of upper horizontal section, but lower than that of two horizontal sections. Valve has the possibility of separating horizontal sections when fluid level in the well exceeds maximum allowable value, and connection in upward direction of horizontal sections when fluid level decreases below minimum allowable. Valve includes body with central and side through channels, a seat arranged in central channel below side ones, and shutoff element located above the seat with possibility of being moved upwards relative to the body. At that, central channel of the body is equipped with replaceable orifice. Body is equipped above side channels with annular constriction with upper and lower chamfers. Angle of upper chamfer to axis of body is smaller than lower one; the seat is installed in the body with possibility of tight longitudinal downward movement and pressed with a spring in upward direction, and shutoff element is equipped with a stock with a recess on the surface, into which a spring ring having the possibility of interaction with annular constriction of the body, is inserted. At that, spring stiffness, angles of chamfers and stiffness of spring ring are chosen so that when fluid level reaches maximum allowable value, under action of pressure drop, the shutoff element with stock and seat compresses the spring, and spring ring moves below annular constriction of the body when fluid level reaches minimum allowable value.

EFFECT: simplifying the method, increasing the monitoring efficiency of water content of the well and improving reliability of the device operation.

2 cl, 3 dwg