ROTARY LINER CEMENTING METHOD Russian patent published in 2022 - IPC E21B43/10 E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, and in particular to methods for installing and cementing liners in a borehole. The method includes lowering into the well on a string of process pipes with a liner release mechanism, setting it in the required interval, flushing the liner setting interval, cementing the liner with rotation, detaching the process pipes using a release mechanism with lifting before waiting for the cement to harden, washing out the excess cement slurry and buffer liquid over the liner head and waiting for the cement to harden. Preliminarily, as part of the liner, the following bottom-up assembly is installed on the casing pipes: restrictive rings, centralizer, flow rotator with elastic blades at least 1 m long, centralizer, restrictive rings with the possibility of free axial and radial movement of the centralizers between the restrictive rings. In the process of cementing, two identical volumes of cement slurry are pumped through the liner into the annulus, while first the first volume of cement slurry with a reduced density of not more than 1700 kg/m³ is pumped, then the second volume of cement slurry with an increased density of 1800 kg/m³ and more.

EFFECT: increased efficiency of cementing the liner in the well, the quality of liner fastening along the entire length of the lateral or horizontal wellbore increases, a full-fledged cement ring is created along the entire diameter of the wellbore.

2 cl, 4 dwg