Micro-emulsion polymer for in-depth profile control and oil displacement of reservoirs and preparation method thereof

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

Inactive Publication Date: 2010-10-13
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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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 (modulation and displacement) materials and technologies either cannot penetrate into deep formations and only form plugs 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 20% of acrylamide monomer and stir until the solution is clear and free of solid insolubles , and then adjust the solution to pH=7 with NaOH aqueous solution, 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 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 li...

Embodiment 2

[0028] (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, 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: 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 introduce the emulsion into the pi...

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 , and then adjust the solution to pH=7 with NaOH aqueous solution, and stir for 1 to 2 hours;

[0034] (2) Emulsion system preparation: Dissolve 20% surfactant in 22% solvent, after fully dissolving evenly, gradually add the aqueous solution of step (1) and stir fully to obtain transparent or translucent emulsion polymerization reaction system;

[0035] (3) Photopolymerization reaction: after dissolving 1% photoinitiator with 3% 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, make the emulsion system under the deoxygenation condition, and then use the metering pump to introduce the emulsion into the pipeline with the ultraviolet lig...

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Abstract

The invention relates to a micro-emulsion polymer for in-depth profile control and oil displacement of reservoirs and a preparation method thereof. On the basis of a method for preparing a polymer by adopting a photopolymerization reaction, water-solubility anion monomers are added into aqueous solution containing acrylamide monomers, a dispersing agent and a cross-linking agent are added, an oil-water mixed emulsion is formed in a mixed medium of a surfactant and a solvent, and after an imitating agent is decomposed by ultraviolet light in a mode of photopolymerization reaction at the controlled temperature, the emulsion polymerization is initiated so as to form the micro-emulsion polymer. The micro-emulsion polymer prepared by the invention is suitable for reactions under the condition of multiple environments, and has the characteristics of safe and stable reaction systems, simple, easy and convenient operation, flexible adjustment of reaction process and reaction time, high production efficiency, low energy consumption, no pollution and the like. The micro-emulsion polymer of the invention can be dispersed into injection water at any concentration and can enter deep strata to form gel under the action of the cross-linking agent, so that the capability of blocking pore throats is formed gradually, high-permeability stripes of the strata are blocked effectively, the swept volume of the water is enlarged, and the crude recovery ratio of developing the reservoirs through water flooding is improved obviously.

Description

technical field [0001] The invention relates to a polymer polymerized petroleum exploitation chemical material and a preparation method, in particular to a microemulsion polymer suitable for oil reservoir deep control and flooding and a preparation method. 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 to rise rapidly, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/06C08F220/26C08F220/58C08F2/48C08J3/09C08L33/24C09K8/42
Inventor 叶卫保叶勇保马中跃温鸿滨朱超世
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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