| abstract |
Disclosed in the present invention are a sulfonate-betaine-type hydrophobic associated polymer and a preparation method therefor. The preparation process of the sulfonate-betaine-type hydrophobic associated polymer is as follows: mixing acrylamide and acrylic acid in an aqueous solution, adjusting pH of the system to about 6 to 8, adding 3-(methacrylamidopropyldimethylamino) propionate, N-aryl-N-alkyl (meth) acrylamide and sodium dodecyl sulfate, stirring the mixture until the solution becomes clear, passing nitrogen gas to remove oxygen, then adding a photoinitiator azobisisobutylamidine dihydrochloride, and performing polymerization under photoinitiation conditions. The present invention combines the advantages of a two-tailed hydrophobic associated polymer and a betaine-type polymer, significantly increasing the thickening property, temperature resistance, salt resistance, hydrolysis resistance, and thus can be used as an oil displacing agent or an acid fracturing thickener for increasing oil recovery in oil field development. The preparation method is reliable in principle, simple in operation, and has broad market prospects. |