METHOD FOR CEMENTING FIBERGLASS CASING PIPES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to methods of cementing a string of fiberglass casing pipes in a wellbore. The method for cementing fiberglass casing pipes includes lowering a string of fiberglass casing pipes into the well, cementing by sequential injection of a buffer fluid, a cement slurry into the string of fiberglass casing pipes, and squeezing them out with drilling mud. Preliminarily, a device is screwed onto the lower fiberglass casing pipe using a threaded connection, including a hollow body made in the form of a branch pipe and equipped with at least three symmetrically located through side holes directed downward, in the lower part additionally equipped with a shoe with an internal ledge, and from the inner side - a bushing with an inner conical groove in the upper part, mounted on at least two shear pins, with the possibility of overlapping in the transport position the through side holes of the body and the possibility of landing a dropped ball, and a cementing basket rigidly mounted on the outer side of the body, in the form of a spring centralizer with an elastic tarpaulin cuff on the inner side in the lower part of the cementing basket with the possibility of matching and overlapping the through side holes of the body with an elastic tarpaulin cuff, then a check valve with an internal bore diameter exceeding the diameter of the dropped ball and a spring-loaded throttle is installed into the coupling joint between the nozzle and the string of fiberglass casing pipes, then the assembled assembly consisting of a string of fiberglass casing pipes is lowered into the well until the target depth is reached, after running to The ball is dropped from the well at the design depth into the casing, a ball is pushed through it with drilling fluid until it fits into the tapered bore of the sleeve, then a cementing head is installed on the upper fiberglass casing pipe. Also claimed is a device for implementing the method.

EFFECT: increasing the efficiency of cementing fiberglass casing pipes, the quality and reliability of cementing.

4 cl, 4 dwg