Polymer microspheres for water flooding reservoir deep oil displacement and profile control and preparation method thereof

A polymer and oil reservoir technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as high cost, dispersed reservoirs, heterogeneity of reservoirs, etc., and achieve flexible adjustment of reaction process and time , The reaction system is safe and stable, and the effect of enhancing oil recovery

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

[0021] (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 20% of acrylamide monomer and stir until the solution is clear and free of solid insolubles , add 2.5% cross-linking agent and stir for 1-2 hours;

[0022] (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;

[0023] (3) Photopolymerization reaction: After dissolving 1.5% photoinitiator with 5% solvent, join in the emulsion system of step (2), after stirring evenly, pass into inert gas in the reactor, to replace the reaction system Oxygen, so that the emulsion system is under deoxygenation conditions, and then use a metering pump to introduce the emulsion into the pipeline with an ultraviolet light device at a constant speed, so that...

Embodiment 2

[0026] (1) Preparation of aqueous solution: dissolve 10% of water-soluble anionic monomer into 12% of deionized water, add 2.5% of dispersant and stir, then add acrylamide monomer accounting for 31% of the reaction system and fully stir until the solution is clear For solid insoluble matter, adjust the solution to pH = 7 with NaOH aqueous solution, add 0.25% cross-linking agent, and stir for 1 to 2 hours;

[0027] (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;

[0028] (3) photopolymerization reaction: After dissolving 1% photoinitiator with 1.75% solvent, join in the emulsion system of step (2), after stirring evenly, feed inert gas in the reactor, to replace the reaction system Oxygen, so that the emulsion system is under deoxygenation conditions, and then use a metering pump to i...

Embodiment 3

[0031] (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 , then add 2% cross-linking agent, and stir for 1 to 2 hours;

[0032] (2) Emulsion system preparation: Dissolve 20% surfactant in 25% solvent, after fully dissolving evenly, gradually add the aqueous solution of step (1), stir well, and obtain transparent or translucent emulsion polymerization reaction system;

[0033] (3) Photopolymerization reaction: 1% of the photoinitiator is directly 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 in Under the condition of deoxygenation, the metering pump is used to introduce the emulsion into the pipeline with the ultraviolet light device at a uniform...

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Abstract

The invention relates to polymer microspheres for in-depth reservoir oil displacement and profile control and a preparation method thereof. In the method, based on the method that photopolymerization is used to prepare the polymer, water-soluble anionic monomer is used and acrylamide monomer water solution, dispersant and crosslinking agent are added 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 polymer microspheres material prepared by the invention can be used in various environmental conditions and is characterized of safe and stable reaction system, simple and convenient operation, flexible and controllable reaction process and time, high production efficiency, low energy consumption, non-pollution and the like. 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 and significantly increase crude oil recovery of water flooding reservoir.

Description

technical field [0001] The invention relates to a polymer polymerized petroleum exploitation chemical material and a preparation method thereof, in particular to a polymer microsphere suitable for water flooding and development of oil reservoirs and a preparation method thereof. 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 circulation, causing the water content of the oil well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/28C08F220/58C08F2/48C08F2/24C09K8/42
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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