Hydrophobic association acrylamide polymer emulsion and preparation method thereof

Abstract

The invention relates to a hydrophobic associated acrylamide polymer emulsion and a preparation method thereof. The hydrophobic associated acrylamide polymer emulsion and the preparation method thereof in the invention mainly overcome the problems that conventional hydrophobic associated polymers are prepared through micelle or aqueous solution polymerization, equipment and processes used in the prior art are lengthy, complicated and high in energy consumption, and difficulties exist in on-site application of the conventional hydrophobic associated polymers to oil displacement in oil fields, especially in oil displacement of offshore oil reservoirs. According to the invention, a reversed-phase emulsion polymerization method is employed, and a commercial nonionic surfactant is used as an emulsifier in an oil-water system; and the hydrophobic associated polymer emulsion with high solid content is obtained by controlling the feeding speed of an initiator and can be rapidly dispersed in water, which facilitates on-site on-line injection of the emulsion for oil displacement. The hydrophobic associated acrylamide polymer emulsion comprises, by weight, 10 to 50 parts of an oil phase, 1 to 10 parts of an emulsifier and a co-emulsifier and 40 to 80 parts of a water phase containing copolymerization monomers. The hydrophobic associated acrylamide polymer emulsion provided by the invention overcomes the above problems and is suitable for on-site application to continental or marine oil displacement or the like for improvement of recovery efficiency.

Description

technical field [0001] The invention relates to a hydrophobic association acrylamide polymer emulsion and a preparation method thereof. Background technique [0002] Hydrophobically associated water-soluble polymers refer to a class of water-soluble polymers with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer. Due to its unique solution properties such as viscosity increasing, salt resistance, and shear resistance, it has a good application prospect as a new type of polymer oil displacement agent in harsh oil reservoir development. [0003] Due to the large difference in polarity between the hydrophilic monomer and the hydrophobic monomer, it is difficult to fully mix the hydrophilic monomer and the hydrophobic monomer during the synthesis process. Generally, there are two ideas in the synthesis of hydrophobic association polymers. One is the copolymerization method in which hydrophobic monomers are directly connected to water-so...

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Problems solved by technology

[0006] On the basis of comparing various polymerization methods and conducting extensive and in-depth research on the synthesis, structure characterization and properties of acrylamide hydrophobic association polymers by inverse emulsion method, the present invention provides a hydrophobic association The acrylamide polymer emulsion and its preparation method mainly solve the problem that in the prior art, hydrophobic association polymers are usually polymerized by micelles or aqueous solutions, and the dry powder preparations need to be obtained by cutting, pulverizing, drying, and pulverizing again. The first is that the production process is relatively lengthy and complex, and the energy consumption is higher. The second is that the dry powder preparation of hydrophobic association polymers requires special equipment, and it needs to go through high-speed stirring, dissolution, and aging processes. bring some difficulties

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