Oil displacement system and method for low permeability reservoir
A technology of oil displacement and system, which is applied in the field of oil displacement system of low permeability reservoirs, can solve the problems of residue clogging formation, poor viscoelasticity, application limitations, etc., and achieve the effects of cost saving, high viscosity and elasticity
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[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] The invention provides an oil displacement system for low-permeability oil reservoirs, including an association polymer; the molecular weight of the association polymer is 1.014 to 9.975 million; in molar percentage, the association polymer is composed of acrylamide , 0.09% to 10.2% of hydrophobic monomers and 0 to 15.4% of functional monomers are polymerized; the concentration of the associated polymer in the oil displacement system is 200 to 3500 mg / L; the hydrophobic...
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