Two-phase pam/amps nano-microsphere latex and preparation method and application

Abstract

Two-phase PAM / AMPS nano-microsphere latex and its preparation method and application, adding a cross-linking agent to polyethylene glycol aqueous solution to obtain a mixed solution; acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and Mix distilled water evenly, adjust the pH value and add it to the mixed solution, then add the initiator solution drop by drop, and react for 1-3 hours under nitrogen atmosphere at 50°C-60°C after dropping. In the present invention, the two-phase PAM / AMPS copolymer nano-microsphere latex is prepared into a certain concentration of two-phase PAM / AMPS copolymer nano-microsphere latex from clear water and salt water, and then injected into the formation under the action of an injection pump. PAM / AMPS copolymer nanospheres gradually absorb water and swell to seal the matching formation, and under the action of the injection medium pressure, deform and break through the pore throat and enter the deep formation, realizing multi-level plugging and flooding, improving low permeability and Heterogeneity of medium and low permeability reservoirs, enhanced oil recovery.

Description

Two-phase PAM / AMPS nano-microsphere latex and preparation method and application technical field The present invention relates to chemistry, oil field chemistry field, be specifically related to two-phase PAM / AMPS nano-microsphere latex and preparation methods and applications. Background technique Polyacrylamide microspheres expand in volume when encountering water and remain unchanged when encountering oil, have good plugging performance, and can improve Change the flow direction of injected water, improve the sweep coefficient of injected water, improve oil recovery, and apply polyacrylamide microspheres to control flooding Profile control is a new type of deep plugging control technology developed in the field of oilfield exploitation in recent years. Polyacrylamide microspheres are mostly used Prepared by reversed-phase suspension polymerization and reversed-phase (micro)emulsion polymerization methods. Inverse suspension polymerization is the dispersion of re...

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Problems solved by technology

However, both inverse suspension polymerization and inverse emulsion polymerization use organic solvents, the production cost is relatively high, there are problems such as solvent pollution, recycling and production safety, and the application fields with high requirements for solvent residues are limited.

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