BLOCK COPOLYMERS FOR EXTRACTION OF HYDROCARBON FLUIDS FROM UNDERGROUND DEPOSIT Russian patent published in 2013 - IPC C09K8/508 C09K8/512 C09K8/588 

FIELD: oil and gas industry.

SUBSTANCE: composition containing cross-linked polymer microparticles having average diameter of particles of non-increased volume of approximately 0.05 to approximately 5000 mcm and content of cross-linking agents of approximately 100 to approximately 200000 ppm, labile cross-linking agents and 0 to approximately 300 ppm of non-labile cross-linking agents; besides, expanded polymer microparticles have structure of block copolymer containing at least two different monomers with different chemical structure. Besides, a method for improvement of production of hydrocarbon fluids from an underground formation is described, which involves pumping of the proposed composition to the underground formation.

EFFECT: proposed composition provides effective spreading of microparticles in porous structure of deposit, thus increasing extraction degree of hydrocarbon fluids from underground formations.

20 cl, 3 ex