Preparation method of hyperbranched zwitterionic polyacrylamide and application of hyperbranched zwitterionic polyacrylamide in oilfield exploitation

Abstract

The invention discloses a preparation method of hyperbranched zwitterionic polyacrylamide and application of the hyperbranched zwitterionic polyacrylamide in oilfield exploitation. The preparation method comprises the following steps that S1, materials are prepared by mole; S2, 0.05-0.2 part of 4-dimethylaminopyridine and 0.01-0.05 part of dicyclohexyl carbodiimide are dissolved in 1-2 parts of diethyl ether to prepare a composite catalyst; S3, 2-3 parts of a cyclohexanol branching agent and 16-24 parts of ethylenic-bond-type unsaturated anionic monomers react with each other at 70-80 DEG C for 2-3 hours under the function of the catalyst; S4, 40-60 parts of acrylamide monomers, 6-12 parts of sodium methacrylate monomers, 10-18 parts of ethylenic-bond-type unsaturated cationic monomers andan initiator are added into the first reaction solution, and a polymerization reaction is carried out at 45-70 DEG C for 4-10 hours; S5, 2-6 parts of tetrabutyl titanate is added, the pH is adjustedto be 5.0, hydrolysis is carried out at 65-85 DEG C for 1-2 hours, and overnight standing, neutralization and drying are conducted. According to the method, with cyclohexanol as a hexahydroxy parent nucleus, the spherical polyacrylamide with a three-dimensional stereoscopic multi-arm compact structure is synthesized, the salt resistance and shear resistance are obviously improved, the molecular weight is high, and the polyacrylamide is easily dissolved in various solvents.

Description

technical field [0001] The invention belongs to the technical field of polyacrylamide polymer synthesis, and in particular relates to a preparation method of hyperbranched zwitterionic polyacrylamide and its application in oilfield exploitation. Background technique [0002] Hyperbranched polymers are special polymers with a highly branched topology, with a large number of branch nodes and active end groups. Compared with linear polyacrylamide, hyperbranched multi-arm polyacrylamide has a unique spherical three-dimensional compact structure, small hydrodynamic radius of gyration, less molecular chain entanglement, more active end groups, and is easy to dissolve. Under the action of high shear, its molecular structure is not easy to curl and entangle, and its stability and rheology are higher. It has excellent performances such as oil displacement, water blocking and lubrication. [0003] In view of the above excellent properties, in recent years, hyperbranched polyacrylamid...

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Problems solved by technology

[0003] In view of the above excellent properties, in recent years, hyperbranched polyacrylamide has gradually become a research hotspot in the field of polyacrylamide synthesis. For example, the patent application number CN201610465108.7 discloses a polymer based on fluorine-containing hyperbranched multi-arm polyacrylamide The polymer oil displacement agent of object; Such as the patent of CN201610178694.7, disclose the hyperbranched polymer oil displacement agent based on polyethylene glycol / cyclodextrin composite structure and preparation method thereof; Such as application number, CN201510-253411.6 patent, which discloses a hyperbranched multi-arm polyacrylamide polymer and its preparation method; for example, the patent application number CN201710184609.2 discloses a hyperbranched amphoteric polyacrylamide and its preparation method; Related patents and literature reports and disclosures of cyclohexyl hexyl alcohol as a hyperbranched zwitterionic polyacrylamide with a hexahydroxyl nucleus, the present invention also utilizes the interaction between nano-titanium dioxide hydrolyzed from tetrabutyl titanate and polyacrylamide end groups Polymerization inhibition by physical crosslinking

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