Comb type structure amphiprotic ionic polymer filtrate reducer and preparation method thereof

Abstract

The invention relates to a comb type structure amphiprotic ionic polymer fitrate reducer and a preparation method thereof. The fitrate reducer is prepared from the following monomers in parts by weight through copolymerization: 20 to 40 parts of 2-acrylamide-2-methallyl sulfonate, 5 to 30 parts of polyethylene glycol monomethyl ether methyl acrylate, 10 to 60 parts of N,N-dimethyl acrylamide and 5to 20 parts of dimethyl diallyl ammonium chloride. The fitrate reducer contains molecule groups such as quaternary ammonium groups, amido groups and sulfonic groups, wherein the sulfonic groups havehigh hydration capability; the amido groups and quaternary ammonium salts have high adsorption capacity on clay; the adsorption stability of the fitrate reducer under the high temperature condition; aproduct obtained through graft copolymerization on macromolecule monomers of polyethylene glycol monomethyl ether methyl acrylate and other monomers is of a comb type specific structure; the anti-shearing performance and the high-temperature stability can be further improved; the fluid loss performance is ensured; meanwhile, the temperature resistant and salt resistant effects are good; the fitrate reducer can be effectively applied to drilling fluid in high-temperature complex formation environment.

Description

technical field [0001] The invention belongs to the field of additives for drilling fluids, and in particular relates to a comb-shaped structure zwitterionic polymer fluid loss reducer and a preparation method thereof. Background technique [0002] With the development of the petroleum industry and the increasing demand for petroleum, the drilling depth continues to increase, and more and more high-temperature complex formations and downhole complex situations are encountered. Drilling fluid is called the "blood" of drilling technology and is an important part of drilling technology. Drilling fluid with high temperature and salt resistance is playing an increasingly important role in the drilling process. Filtrate reducer is one of the important agents of drilling fluid, its function is to form a low permeability, flexible, thin and dense filter cake on the well wall, reduce the fluid loss of drilling fluid as much as possible, and maintain the stability of the well wall , ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a comb-shaped structure zwitterionic polymer fluid loss control agent, thereby solving the problem that the existing fluid loss control agent cannot have both excellent fluid loss control performance and temperature and salt resistance performance

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