METHOD AND DEVICE FOR FLUSHING WELL, TREATING FORMATION AND COMPLETING A WELL IN ONE TRIPPING OPERATION Russian patent published in 2024 - IPC E21B37/00 E21B43/27 E21B43/25 

FIELD: oil industry.

SUBSTANCE: group of inventions is related to the oil industry and can be used in the development of oil fields. When implementing the method, a device is lowered onto a tubing string that destroys bottomhole cakes with a jetting effect, mechanical rotation or with a combined jetting effect with rotation, along with a liner made of tubing or drill pipes, an emergency disconnector, a device that distributes flows, including sealing elements cuff or cup type, moved along the production string in the activated state and a cross-sectional unit, a flushing device, including a movable rod and inlet circulation holes for supply and return of flushing fluid, a jet pump. The unit is configured to transfer the fluid flow supplied from the annulus above the sealing elements to the pipe space and back from the annulus below the sealing elements to the pipe space. The liquid is supplied into the annulus with its flow to the device that destroys the bottomhole cakes, with a combination of direct and reverse flushing, the ball is through which the rod is moved and the inlet circulation holes are closed for the supply and return of the flushing fluid is discharged, chemical reagents are pumped into the formation via the tubular space of the tubing. After the chemical reaction is carried out, the jet pump insert with fittings is released, the circulation holes of the jet pump are opened, liquid is supplied through the annulus and inflow from the well through the pipe space is caused.

EFFECT: time costs are reduced, the efficiency of technological work is increased, the number of tripping operations and the impact of killing fluids and flushing fluid on the formation are reduced, and the turnaround period is increased.

2 cl, 1 dwg