The proposed technology is protected by RF patent No.2382172. The method implies that a polymer composition, cement slurry and (at the final stage of cementing) a polymer/cement mixture are sequentially injected in the amount sufficient to fill the annular space in the productive layer interval.

Fragility of the resulting synthetic resin based polymer/cement stone is lower in comparison with the cement stone. This increases the resistance of the polymer/cement stone to alternating loads, which the cement sheath in the annulus of the pay zone is constantly exposed to in the process of perforation and operation of wells. The cured polymer/cement stone demonstrates high corrosion resistance in corrosive reservoir fluids.

Various synthetic resin based polymer/cement compositions, which cure in the cement slurry environment, are used as a plugging material.

The injection of polymer composition prior to cement slurry is necessary for the polymer composition to evenly distribute and solidify after penetration into rock and mud cake, forming a solid impermeable barrier in the near-wellbore part of rock. The developed method improves the structural and mechanical properties of the filter cake and rock contacting with the cake. This saves reservoir properties due to the formation of impermeable polymer based barrier in the near-wellbore part. Filling of the reservoir interval annulus with 10-20 m of polymer/cement material overlap in the final stage of cementing provides for high sealing contact of the polymer/cement slurry with the polymer/cement cake crust and casing metal.

Application of polymer/cement slurry for production strings sealing will allow the Company’s professionals to effectively carry out both sealing and additional sealing of production strings as the resulting polymer/cement slurry filtrate has a high penetrating power, while the cement slurry does not penetrate into the formation pores and fractures. Therefore, the filtrate containing resin penetrates and cures in tight channels and eliminates leakage, while the formed polymer/cement stone prevents squeezing of filtrate in the process of its curing. Moreover, the resin specifically gets into the leak channels and is not diluted with reservoir fluids on the way to wellbore, which typically occurs when pumping pure resins, since their density is less than the density of reservoir fluids.