A kind of double tail hydrophobic association polymer with surface activity and preparation method thereof

Abstract

The invention discloses a double-tailed hydrophobic association polymer with surface activity and a preparation method thereof. The double-tailed hydrophobic association polymer is prepared by free radical micellar polymerization: it contains acrylamide, acrylic acid, 2-propylene Aqueous solution of amido-2-methyl propane sulfonic acid, surface-active macromonomer lauryl polyoxyethylene ether (meth)acrylate, adding surfactant sodium lauryl sulfate and hydrophobic monomer N-phenylethyl ‑N‑Alkyl (meth)acrylamide or N‑Benzyl‑N‑Alkyl (meth)acrylamide, using surfactants to solubilize hydrophobic monomers in the micelles they form, using sodium hydroxide The pH value is adjusted to 6~8, and the hydrophobic monomer and the water-soluble monomer are copolymerized by photoinitiation. The polymer can effectively improve the properties of the hydrophobic association polymer such as thickening, temperature resistance, salt resistance, hydrolysis resistance, etc., and the preparation method has reliable principle and simple operation, and has broad market application prospects.

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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