Surface-active two-tailed hydrophobic associated polymer and preparation method thereof

Abstract

The invention discloses a surface-active two-tailed hydrophobic associated polymer and a preparation method thereof; the surface-active two-tailed hydrophobic associated polymer is prepared via micellar free radical copolymerization: adding a surfactant, sodium lauryl sulfate, and a hydrophobic monomer, N-phenethyl-N-alkyl (methyl) acrylamide or N-benzyl-N-alkyl (methyl) acrylamide into the aqueous solution of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and surface-active macromonomer polyoxyethylene lauryl ether (methyl) acrylate, using the surfactant to solubilize the hydrophobic monomer in the formed micelle, using sodium hydroxide to adjust pH to 6-8, and copolymerizing the hydrophobic monomer and a water-soluble monomer by means of photo-initiation. The properties, such as tackifying performance, temperature resistance, salt resistance and hydrolysis resistance, of the polymer can be effectively improved, the preparation method and principle of the polymer are reliable, and the preparation method is simple to perform and has a promising application prospect.

Description

technical field [0001] The invention relates to a surface-active double-tailed hydrophobic association polymer used for oil field enhanced recovery and acid fracturing and a preparation method thereof. Background technique [0002] Traditional polymers, such as partially hydrolyzed polyacrylamide (HPAM), have poor temperature resistance, salt resistance, and shear resistance. Under high-temperature and high-salt reservoir conditions, HPAM will polymerize due to hydrolysis, thermal degradation, and chain coiling. The viscosity of the solution drops sharply, which cannot meet the requirements of enhanced oil recovery and acid fracturing in high-temperature and high-salt reservoirs. However, the hydrophobic association polymer with a small amount of hydrophobic groups introduced into the molecular chain has high-efficiency viscosity-increasing properties, excellent salt resistance, good temperature resistance, and shear resistance. Acid fracturing shows good application prospe...

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Problems solved by technology

Styrene-type hydrophobic monomers, although they have rigid benzene rings, can effectively improve the temperature resistance and hydrolysis resistance of polymers, but the benzene rings are too close to the main chain of the molecule, which is not conducive to the copolymerization of hydrophobic monomers and acrylamide. It is also unfavorable for improving the viscosity-increasing effect of polymer solution (Zhong Chuanrong, etc., the characterization and heat resistance of AM-STD-NaAMPS ternary hydrophobic association copolymer. Polymer Materials Science and Engineering, 2003,19(6):126-130 )

Allyl-type hydrophobic monomers, because they contain allyl groups, are difficult to realize the copolymerization with the main monomer acrylamide, and the molecular weight of the hydrophobic association polymer prepared is not high, and the viscosity-increasing effect is not obvious (Rosan et al., a Synthesis and Solution Properties of Hydrophobic Association Polymers with Imidazoline Structure. Chemical Research and Applications, 2015, 27(8): 1151-1156)

Acrylamide-type hydrophobic monomer, its structure is similar to acrylamide, which is beneficial to the polymerization reaction, but it has a certain disadvantage of poor hydrolysis resistance (Geng Tongmou. Hydrophobic association water-soluble polymer P(AM / NaAA / DiAC16) Viscosity Behavior of Aqueous Solutions. Fine Chemical Industry, 2007,24(9):914-918)

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