PLANT FOR REMOVAL OF FORMATION FLUID FROM WELL, AND METHOD OF ITS IMPLEMENTATION Russian patent published in 2013 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: plant includes production tubing with upper shock absorber with a bar, lower shock absorber, flying valve in the form of a housing with detachable element in the form of sphere and limit switch of its entry to axial channel of tubular housing. According to the invention, limit stop is made in the form of a shell with longitudinal slots on lower end, which is rigidly attached to detachable tubular housing, spring-loaded bushing equipped with pins and the upper end of which envelopes the shell with possibility of introducing the pins to its longitudinal slots and axial movement, at interaction with detachable element. Tubular housing has detachable structure, and annular chamber equipped with a hollow ring with tangential holes is formed in the place of detachment of its parts. At that, detachable element is made in the form of a hollow sphere, with a counter-weight in one of the semi-spheres, which is equipped with perforations, and installed on the end face of spring-loaded bushing with possibility of annular gap formation. Upper shock absorber is equipped with a spring-loaded piston installed on the bar, with possibility of formation of a movable connection in axial channel of tubular housing in upper position. Method involves periodic start of flying valve for fluid level to lower shock absorber and its further lifting in production tubing together with column of formation fluid to the well head. Flying valve with detachable element is lifted at maximum pressure drop between production tubing and intertube space. When flying valve is being lifted with column of formation fluid there performed is bypass of some part of gas from axial channel of flying valve body under detachable element to annular gap between surface of tubular housing of flying valve and production string pipe. Detachment of detachable element from tubular housing on upper shock absorber is performed by introducing a spring-loaded piston to its axial channel.

EFFECT: higher operating reliability of the device and efficiency of the method.

3 cl, 4 dwg