| abstract |
The invention relates to a composition for improving oil recovery in oil fields and a preparation method thereof, which mainly solves the problems of poor temperature resistance and salt resistance and low oil displacement efficiency of oil displacement agents containing polymers in the prior art. The oil displacement composition for tertiary oil recovery of the present invention comprises the following components by weight percentage: (1) 0.01-5.0% of temperature-resistant and salt-resistant copolymer KWKY-PAD; (2) 0.01-5.0% of fatty alcohol poly Oxyethylene ether carboxylate surfactant; (3) 90.0-99.98% injection water; wherein (1) the general molecular formula of the component is: In the formula, R 1 and R 2 are both C 1 ~ C 16 alkyl groups, x, y, and m are the molar numbers of monomer structural units respectively, and the molecular formula of (2) component is RO(CH 2 CH 2 O ) n CH 2 COOM, where: R is an alkyl group of C 12 ~ C 18 , n is the addition number of ethoxy group EO; M is any metal ion selected from potassium, sodium or lithium; water The technical scheme selected from oil field injection water solves this problem well and can be used in tertiary oil recovery production in oil fields. |