METHOD FOR CEMENTING FIBERGLASS CASING AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC E21B33/14 E21B23/01 

FIELD: cementing methods.

SUBSTANCE: invention relates to methods and devices for cementing a fiberglass casing in a wellbore. The method for cementing fiberglass casing includes lowering the fiberglass casing into the well, sequentially pumping buffer fluid, cement slurry into the fiberglass casing, and squeezing it out with drilling fluid. A device for cementing the fiberglass casing is preliminarily screwed onto the lower part of the fiberglass casing using a threaded connection. The device includes a body consisting of a lower part and an upper part with an external thread and shear elements. The body with an external thread at the top is equipped with at least two stop pins and a tapered groove ending in a characteristic shoulder at the bottom of the body. The body is additionally equipped with a shoe part made in the form of a shoe, which is equipped with at least two vertical grooves that can be aligned with the body's limit pins when shear elements are cut off and the body downward movement is limited. The device is equipped with at least three paws with notches at the ends on the outside and a tapered groove, made mirror-like in relation to the tapered groove in the lower part of the body and a characteristic shoulder on the outside, mounted on the axle and compressed by springs. The device is equipped with through flushing holes between the tines. After lowering the fiberglass casing to the design depth and fixing it in the well, it is unloaded to the bottomhole by the value of the pipe weight. Also claimed is a device for implementing a method for cementing fiberglass casing.

EFFECT: increasing the efficiency, quality and reliability of fiberglass casing cementing, due to guaranteed fixation of the fiberglass casing in the well, and eliminating its floatation during the cementing process.

2 cl, 3 dwg