Hydrophobic associated polymer and preparation method thereof

Abstract

The invention provides a hydrophobic associated polymer, which comprises the following four repetitive units represented in the description. In the formula, y=0.001 to 0.02, z=0.01 to 0.12, m=0.08-0.3, and x+y+z+m=1; the A represents a monomer unit of hydrophobic monomer, which can be one or more of allyl alkyl quaternary ammonium salt, acrylamide alkyl sulfonic acid, acrylamide alkyl sulfonate, alkyl phenol polyoxyethylene acrylate, and polyoxyethylene alkyl acrylate; the D represents a monomer unit of functional monomer, and the viscosity average molecular weight of the hydrophobic associated polymer is in a range of 30 million to 45 million. Compared with the prior art, the provided acrylamide monomer unit of the hydrophobic associated polymer can provide hydrophilic groups; the monomer unit of hydrophobic monomer can provide hydrophobic side groups, the provided polymer can construct spatial network in water and provides viscosity for the solution; monomer unit of acrylic acid ions can improve the solubility of polymer; and the introduction of monomer unit of functional monomer can improve the temperature resistant and salt resistant performance of the polymer.

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...

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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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