Polymer microspheres for high temperature hypersalinity reservoir deep profile control and preparation method thereof

A technology for high salinity and deep profile control, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as poor stability and reliability, rapid rise of water cut in oil wells, reservoir heterogeneity, etc. Achieve the effect of high production efficiency, improvement effect and low energy consumption

Inactive Publication Date: 2010-01-06
CHINA UNIV OF PETROLEUM (EAST CHINA) +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the oil reservoirs in my country belong to continental deposits, the oil saturation is relatively low, the reservoirs are scattered, and the reservoir heterogeneity is serious. Therefore, high-permeability bands are often formed during the water injection development process, and the injected water cannot flow in the reservoir. Crude oil is effectively driven in the oil well, and it flows out of the oil well quickly, forming an invalid circulation, causing the water content of the oil well to rise rapidly, resulting in water flooding
Existing profile control materials and technologies either cannot penetrate deep into the formation and only form a plug near the wellbore, or have problems such as poor stability and reliability, and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of aqueous solution: dissolve 18% of water-soluble anionic monomer into 10% of deionized water, add 3% of dispersant and stir, then add 25% of 3-acrylamido-3-methylbutyrate sodium Fully stir until the solution is clear and free of solid insoluble matter, add 2.5% cross-linking agent, and stir for 1 to 2 hours;

[0024] (2) Emulsion system preparation: Dissolve 15% surfactant in 20% solvent, after fully dissolving evenly, gradually add the aqueous solution in step (1), stir well, and obtain transparent or translucent emulsion polymerization reaction system;

[0025] (3) Photopolymerization: 1.5% photoinitiator is added to the emulsion system of step (2), after stirring evenly, an inert gas is passed into the reaction kettle to replace the oxygen in the reaction system, so that the emulsion system is deoxidized Under the conditions, the metering pump is used to introduce the emulsion into the pipeline with the ultraviolet light device at a constant speed,...

Embodiment 2

[0028] (1) Aqueous solution preparation: dissolve 10% water-soluble anionic monomer into 12% deionized water, add 2.5% dispersant and stir, then add 33% 2-acrylamido-2-methylpropanesulfonic acid Stir well with the acrylamide monomer mixture until the solution is clear and free of solid insolubles, add 0.25% crosslinking agent, and stir for 1 to 2 hours;

[0029] (2) Emulsion system preparation: Dissolve 10% surfactant in 22% solvent, after fully dissolving evenly, gradually add the aqueous solution in step (1) and stir fully to obtain transparent or translucent emulsion polymerization reaction system;

[0030] (3) Photopolymerization reaction: 2% photoinitiator is added in the emulsion system of step (2), after stirring evenly, inert gas is passed into the reactor to replace the oxygen in the reaction system, so that the emulsion system is deoxidized Under the conditions, the metering pump is used to introduce the emulsion into the pipeline with the ultraviolet light device at ...

Embodiment 3

[0033] (1) Preparation of aqueous solution: Dissolve 15% of water-soluble anionic monomer into 9% of deionized water, add 1% of dispersant and stir, then add 27% of acrylamide monomer and stir until the solution is clear and free of solid insolubles , add 2% cross-linking agent and stir for 1-2 hours;

[0034] (2) Emulsion system preparation: Dissolve 20% surfactant in 27% solvent, after fully dissolving evenly, gradually add the aqueous solution of step (1), stir well, and obtain transparent or translucent emulsion polymerization reaction system;

[0035] (3) Photopolymerization reaction: Add 1% photoinitiator to the emulsion system of step (2), after stirring evenly, pass inert gas in the reaction kettle to replace the oxygen in the reaction system, so that the emulsion system is in deoxidation Under the conditions, the metering pump is used to introduce the emulsion into the pipeline with the ultraviolet light device at a constant speed, so that it can fully react through ...

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Abstract

The invention provides polymer microspheres for high temperature hypersalinity reservoir deep profile control and a preparation method thereof. In the method, based on the method that photopolymerization is used to prepare the polymer microspheres, heat and salt resistance polymer materials such as sodium 3-acryloylamino-3-methyl butyrate, 2-acryloylamino-2-methylpropane sulfonic acid, acrylamide monomer and the like and water-soluble anionic monomer are adopted and dispersant and cross-linking agent are added as so to form oil-water mixed emulsion in the mixed medium of surfactant and solvent; then initiator is decomposed by ultraviolet through photopolymerization under controllable temperature so as to initiate emulsion polymerization and 50-500nm of microspheres are formed. The invention utilizes the ability of microspheres that microspheres can be dispersed in arbitrary concentration and injected in the water and can gradually swell after entering in depth of the formation to plug the pore throat so as to effectively plug the high permeable strip of the formation, expand the water swept volume, significantly increase crude oil recovery of water flooding reservoir and is applicable to high temperature hypersalinity reservoir deep profile control.

Description

technical field [0001] The invention relates to a polymer microsphere used for deep profile control of high-temperature and high-salinity reservoirs in the field of polymer materials and a preparation method, which is particularly suitable for application in the development process of water flooding development reservoirs. Background technique [0002] In the process of oilfield development, water injection development is the most economical and effective method to replenish formation energy and enhance oil recovery. Since most of the oil reservoirs in my country belong to continental deposits, the oil saturation is relatively low, the reservoirs are scattered, and the reservoir heterogeneity is serious. Therefore, high-permeability bands are often formed during the water injection development process, and the injected water cannot flow in the reservoir. Crude oil is effectively driven in the oil well, and it flows out of the oil well quickly, forming an ineffective circulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/56C09K8/42C08F2/48C08F2/24
Inventor 叶卫保肖建洪叶勇保马中跃温鸿滨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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