METHOD OF OIL EXTRACTION FROM WELL (VERSIONS) AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2011 - IPC E21B43/00 E21B34/02 

FIELD: oil and gas industry.

SUBSTANCE: at pump method of oil production in the wellhead there installed is control valve unit. When the mode of the well is being switched, measurements of dynamic level of liquid are performed in the well shaft. Then, by controlling the volume of produced oil flow through control valve unit there determined is the value of dynamic level of liquid in the well shaft, at which the stable daily operating mode of the well is provided. Value of buffered pressure at the well head is recorded when the oil is being lifted, which is maintained during pump operation of the well. At gush production method of oil, the design operating conditions of the well are determined as per dynamic level of liquid in the well shaft, buffered pressure and the rate of flow. Then, value of buffered pressure at the well head is recorded when the oil is being lifted, which is maintained during gush operation of the well. Methods are implemented by means of the device for oil production from the well, which contains the tubing string the upper end of which is connected to delivery line and control valve unit installed in the wellhead. Body of control valve unit is made of three bushings coaxially connected to each other on the thread. Front bushing is made in the form of pressure nut. Middle bushing has side channel interacting its inner cavity to delivery line; inside the bushing there fixed is the seat and arranged is spring-loaded valve in the form of ball. End bushing has inner open cavity on the side of its output end, in which there arranged is control mechanism of wellhead buffered pressure, which includes thrust disc with pusher. Pusher is led through front edge of the end bushing and seal in it to inner cavity of middle bushing to bear against the valve in the form of a ball. Inside end bushing on the thread there screwed is control stock the shank of which with the element on the end for rotation of stock has smaller diametre and is led to the outside from end bushing through the hole made in the pipeline wall of the wellhead to external space of the well head.

EFFECT: reducing oil production losses, shortening the time for work execution, excluding material costs and hardware for bringing the wells into operation after they have been switched to another operating mode.

9 cl, 2 dwg