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Micro emulsion polymer for displacement control of oil deposit deep part with high temperature and mineralization and preparation method

A high-salinity, polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability and reliability, rapid rise of water content in oil wells, and low oil saturation, and achieve production efficiency. High, improved effect, low energy consumption effect

Inactive Publication Date: 2010-10-20
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
The existing control and drive materials and technologies either cannot penetrate deep into the formation, but 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

[0022] (1) Aqueous solution preparation: Dissolve 18% of water-soluble anionic monomers in 10% of deionized water, add 3% of dispersant and stir, then add 25% of sodium 3-acrylamido-3-methylbutyrate Stir thoroughly until the solution is clear and free of solid insolubles, then adjust the solution to pH=7 with 1% NaOH aqueous solution, and stir for 1 to 2 hours;

[0023] (2) Emulsion system preparation: Dissolve 15% of surfactant in 20% of solvent, and after fully dissolving uniformly, add the aqueous solution of step (1) gradually and stir thoroughly to obtain a transparent or translucent emulsion polymerization reaction system;

[0024] (3) Photopolymerization: After dissolving 1.5% of the photoinitiator in a solvent, add it to the emulsion system of step (2), and after stirring uniformly, inert gas is introduced into the reactor to replace the oxygen in the reaction system. Put the emulsion system under deoxygenation conditions, and then use the metering pump to introduce the em...

Embodiment 2

[0027] (1) Aqueous solution preparation: Dissolve 10% of water-soluble anionic monomer into 12% of deionized water, add 2.5% of dispersant and stir, then add 33% of 2-acrylamido-2-methylpropanesulfon Stir the mixture of acid and acrylamide monomer fully until the solution is clear and free of solid insolubles, then adjust the solution to pH=7 with 1% NaOH aqueous solution, and then stir for 1 to 2 hours;

[0028] (2) Emulsion system preparation: Dissolve 10% surfactant in 22% solvent, and after fully dissolving it, add the aqueous solution of step (1) step by step and stir well to obtain a transparent or translucent emulsion polymerization reaction system;

[0029] (3) Photopolymerization reaction: After dissolving 2% of the photoinitiator in a solvent, add it to the emulsion system of step (2). After stirring uniformly, inert gas is introduced into the reaction kettle to replace the oxygen in the reaction system. Put the emulsion system under deoxygenation conditions, and then us...

Embodiment 3

[0032] (1) Aqueous solution preparation: Dissolve 15% water-soluble anionic monomer into 9% deionized water, add 1% dispersant and stir, then add 27% acrylamide monomer and stir thoroughly until the solution is clear and there is no solid insoluble matter , And then adjust the solution to pH=7 with 1% NaOH aqueous solution, and stir for 1 to 2 hours;

[0033] (2) Emulsion system preparation: Dissolve 20% of surfactant in 27% of solvent, and after fully dissolving it, add the aqueous solution of step (1) gradually and stir thoroughly to obtain a transparent or translucent emulsion polymerization reaction system;

[0034] (3) Photopolymerization reaction: After 1% of the photoinitiator is dissolved in a solvent, it is added to the emulsion system of step (2), after stirring uniformly, an inert gas is introduced into the reactor to replace the oxygen in the reaction system. Put the emulsion system under deoxygenation conditions, and then use the metering pump to introduce the emulsio...

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Abstract

The invention provides a preparation method of a micro emulsion polymer for displacement control of an oil deposit deep part with high temperature and mineralization. The preparation method comprises the following steps of: on the basis of preparing the micro emulsion polymer by adopting a photopolymerication, adding 3-acrylamide group-3-methyl sodium butyrate, 2-acrylamide group-2-methyl propanesulfonic acid and other temperature-resistant salt-resisting materials and water-soluble anion monomers into a water solution containing acrylamide monomers; adding a dispersion agent; forming a water-oil mixed emulsion in a mixed medium of a surfactant and a solvent; and decomposing an initiator to initiate the emulsion for polymerizing to form the micro emulsion polymer by using a photopolymerication mode under the action of controllable temperature. By utilizing the capability of the micro emulsion polymer dispersed into injected water at any concentration, entering a stratum deep part and forming jelly under the action of the cross linking to block a pore throat to effectively block a high-permeation stripe of the stratum, the invention enlarges the swept volume of water, remarkably improves the crude oil recovery ratio for developing the oil deposit driven by water, and is applied to deep part profile control of the oil deposit with high temperature and mineralization.

Description

Technical field [0001] The invention relates to a microemulsion polymer used for deep profile control and flooding in high-temperature and high-salinity oil reservoirs in the field of polymer materials and a preparation method thereof, and is particularly suitable for application in the development process of water drive development reservoirs. Background technique [0002] In the process of oilfield development, water injection development is the most economical and effective way to supplement formation energy and increase oil recovery. Since most of the oil reservoirs in my country are 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 be in the reservoir. The medium effectively drives the crude oil and quickly flows out of the oil well, forming an ineffective cycle, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/56C08F220/06C08F220/28C08F2/48C08F2/24C09K8/588C09K8/42
Inventor 叶卫保饶鹏叶勇保马中跃温鸿滨朱超世
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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