Hydrophobic associated polymer and preparing method thereof

Abstract

The invention provides a hydrophobic associated polymer. The hydrophobic associated polymer comprises four repetitive units (please see the specification), wherein y=0.001-0.2, z=0.005-0.3, m=0.03-0.2 and x+y+z+m=1; A is a monomeric unit of a hydrophobic monomer, and the hydrophobic monomer is selected from one or more of allyl alkyl quaternary ammonium salt, acrylamide alkyl sulfonic acid, acrylamide alkyl sulfonic acid salt, alkyl phenol polyoxyethylene acrylic ester and acrylic acid polyoxyethylene alkyl ester; D is a monomeric unit of a functional monomer; the viscosity average molecular weight of the hydrophobic associated polymer ranges from 500 thousands to 15 millions. Compared with the prior art, hydrophilic base groups can be provided through the monomeric unit of acrylamide in the hydrophobic associated polymer; hydrophobic lateral groups can be provided through the monomeric unit of the hydrophobic monomer, and the necessary viscoelasticity of a solution is provided; the solubleness of the hydrophobic associated polymer can be improved through a sodium acrylate unit; the temperature resistance and the salt tolerance of the hydrophobic associated polymer can be improved through the monomeric unit of the functional monomer.

Description

technical field [0001] The invention belongs to the technical field of polymers, in particular to a hydrophobic association polymer and a preparation method thereof. Background technique [0002] In oilfield development and application technology, it is usually necessary to modify the formation environment, etc., and it is necessary to use certain performance fluids for mass transfer and transportation. By injecting these fluids into the formation, certain substances will be brought into the formation to act to transform the formation environment. To achieve the purpose of oil and gas field development and increase production. At the same time, related application technologies also require these fluids to have certain specific properties, such as thickening, viscoelasticity, drag reduction, permeability, and improved mobility ratio. Among them, the most commonly used fluid is aqueous solution, which has the advantages of wide source, economy, and convenient construction. By...

AI Technical Summary

Problems solved by technology

The output and quality of natural polymers are limited by seasons and regions, and the performance stability cannot be guaranteed. Compared with synthetic polymers, they are used in large amounts and are easy to biodegrade. Higher residues will also seriously damage the environment in the formation, giving Later development brought many new problems

At present, the most widely used synthetic polymer is polyacrylamide. Although its performance in all aspects can meet the construction requirements, it is easy to cause mechanical degradation during the pumping process, and the viscosity of the solution drops rapidly. In high-temperature oil reservoir environment, polyacrylamide is not resistant to salt, and is easily degraded at high temperature, resulting in a significant decline in various properties, and it is difficult to further overcome it on the basis of its existing molecular structure. Therefore, from It is imminent to modify the polymer molecular structure to improve its shear resistance, temperature resistance and salt resistance

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