Polymer microsphere modifying and flooding agent and preparation method thereof

Abstract

The invention discloses a polymer microsphere modifying and flooding agent. The polymer microsphere modifying and flooding agent comprises the following raw materials in parts by weight of 21-25 partsof acrylamide, 5-8 parts of an anionic surfactant, 0.5-1.2 parts of a cross-linking agent, 5-8 parts of an emulsifier, 1.5-2 parts of ammonium persulfate, 0.1-0.5 part of potassium persulfate, 150-250 parts of oil and 100-280 parts of deionized water, and is obtained by uniformly stirring the oil and the emulsifier to form a continuous oil phase; dissolving the acrylamide, the anionic surfactant,the cross-linking agent and part of ammonium persulfate in the deionized water to form a water phase; preparing a potassium persulfate solution and an ammonium persulfate solution; and adding the water phase into the oil phase, adding the ammonium persulfate solution at a low temperature and adding the potassium persulfate solution at a high-temperature, reacting at a constant temperature, and naturally cooling to a room temperature. According to the polymer microsphere modifying and flooding agent provided by the invention, and through the combined reaction of the above materials, the polymer gel microspheres with good gel ductility matched with the pore throat size of the polymer gel microspheres can be synthesized, and the recovery ratio of the petroleum is greatly improved.

Description

technical field [0001] The invention relates to the technical field of oil-displacing agents for oil fields, in particular to a polymer microsphere regulating and displacing agent and a preparation method thereof. Background technique [0002] As an extremely important energy source and chemical raw material, the worldwide demand for oil continues to grow, especially in my country. On the one hand, the growth rate of oil demand for national economic development is greater than ever before. On the other hand, my country's main oil fields All of them have entered the period of high water-cut or ultra-high water-cut mining, the difficulty of mining has increased, the rate of production decline has increased, and the reserve reserves are seriously insufficient, and the contradiction between supply and demand of oil has become increasingly prominent. There are two effective ways to alleviate the increasingly prominent contradiction between oil supply and demand: one is to find new...

AI Technical Summary

Problems solved by technology

For my country's oilfields, there are many development layers, and the inter-layer and intra-layer heterogeneity are serious. After entering the high water-cut and ultra-high water-cut period, the injection fluid has a small sweep coefficient and a low recovery factor.

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