COMBINATION FOR CONTROLLING GAS FILTRATION AND MIGRATION Russian patent published in 2022 - IPC C09K8/493 C04B14/06 C04B24/26 C04B28/02 C09K8/487 E21B21/00 E21B33/138 E21B43/32 

FIELD: oil industry.

SUBSTANCE: invention relates to the field of oil production, more precisely it relates to agents that provide the effect of controlling the filtration and migration of liquids and gases into fluids pumped under pressure into underground formations. Use as an agent for controlling the filtration and/or migration of gases in fluid (F) pumped under pressure into an underground formation is described, wherein specified fluid (F) contains solid particles (p) and/or comes into contact with solid particles (p) in oil-bearing rock after its pumping, a combination containing block copolymer (P) and particles capable of providing a barrier effect for gas. Block copolymer (P) contains the first block (A), which is adsorbed on at least part of particles (p), and the second block (B), the composition of which differs from the composition of the first block (A), with average molecular weight of at least 10,000 g/mol, for example above 100,000 g/mol, and soluble in fluid (F). Particles capable of providing a barrier effect for gas are latex and/or silicon oxide particles in the amount from 1.5 to 6 wt.% of the number of solid particles (p) contained in fluid (F).

EFFECT: increase in the efficiency of controlling the filtration and migration of gases into fluids pumped under pressure into underground formations.

13 cl, 7 tbl, 4 ex