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Microemulsion Conditioning and Flooding System and Its Application

A system and microemulsion technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low oil displacement efficiency, poor temperature resistance and salt resistance, etc., achieve stable control, enhance temperature resistance and salt resistance , Improve the effect of solid content

Active Publication Date: 2021-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the problem of poor temperature and salt resistance and low oil displacement efficiency in the high-temperature, high-salt and low-permeability conditions of the existing technology of the control and displacement agent. A microemulsion control and displacement system is provided.

Method used

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  • Microemulsion Conditioning and Flooding System and Its Application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0051] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0052] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 80 (polyoxyethylene (20EO) sorbitan monooleic acid Esters) mixed with HLB value 15);

[0053] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0054] d) 5 parts of hydrophobic monomers: sodium 2-acrylamido-N-tetradecylsulfonate;

[0055] e) 30 parts of water;

[0056] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comp...

Embodiment 2

[0094] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0095] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0096] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 80 (polyoxyethylene (20EO) sorbitan monooleic acid Esters) mixed with HLB value 15);

[0097] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0098] d) 5 parts of hydrophobic monomers: p-tert-butylstyrene;

[0099] e) 30 parts of water;

[0100] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the following co...

Embodiment 3

[0115] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0116] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0117] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 80 (polyoxyethylene (20EO) sorbitan monooleic acid Esters) mixed with HLB value 15);

[0118] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0119] d) 5 parts of hydrophobic monomers: octadecyl methacrylate;

[0120] e) 30 parts of water;

[0121] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the following...

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Abstract

The invention relates to a micro-emulsion control and displacement system and its application, which mainly solves the problems of poor temperature resistance and salt resistance and low oil displacement efficiency in high-temperature, high-salt and low-permeability reservoir conditions in the existing technology of control and displacement agents. The present invention adopts a microemulsion regulating and flooding system, which includes the following components by weight percentage: (1) 0.01-5.0% core-shell polymer microspheres; (2) 0.01-5.0% anion-nonionic surface Active agent; (3) The technical solution of 90.0-99.98% injection water can better solve this problem, and can be used for deep profile control, water shutoff, oil displacement, etc. to enhance recovery in high temperature, high salt and low permeability reservoirs. Rate field application.

Description

technical field [0001] The invention relates to a microemulsion control and displacement system and its application in tertiary oil recovery of high-temperature, high-salt and low-permeability reservoirs. Background technique [0002] With the development of society and economy, people's demand for oil continues to increase and oil reserves decrease, and oil, as a non-renewable resource, is becoming more and more valuable. The first problem is: the contradiction between supply and demand is prominent, the demand for oil is increasing, and the number of new oil fields is less and less; the second is that there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, primary oil recovery and secondary oil recovery only produce 25-50% of underground crude oil. In order to ensure the long-term stable supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F212/12C08F222/40C08F220/18C08F222/06C08F4/40C08F2/26C08F2/30C09K8/588
CPCC09K8/588C08F2/26C08F2/30C08F4/40C08F220/56C08F220/06C08F220/585C08F226/02C08F220/1818C08F222/06C08F212/12C08F222/40
Inventor 宋晓芳夏燕敏朱益兴许汇王兰
Owner CHINA PETROLEUM & CHEM CORP
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