OIL-FORCING REAGENT FOR INHOMOGENEOUS FLOODED POOLS Russian patent published in 2000 - IPC

FIELD: oil industry, increase of oil recovery form carbonate and terrigenous flooded inhomogeneous pools under conditions of limit water content at latest stage of exploitation of oil fields. SUBSTANCE: technical objective of invention lies in rise of rheological properties of oil-forcing reagent under high shearing stresses and high degrees of mineralization of stratal water and in increase of its thermal oxidizing stability in sweet and highly mineralized water. Oil-forcing reagent for inhomogeneous flooded pools includes, per cent by mass: cross-linked polyacrylamide with molecular mass not less than 1,10⁶•50-98 and carboxymethylcellulose with substitution degree of 0.65- 1.45 in carboxylmethyl groups and polymerization degree of 600-1600•2-50. EFFECT: raised rheological properties of oil-forcing reagent. 2 tbl