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A kind of nanoemulsion injection enhancer for water injection and preparation method thereof

A technology of nanoemulsion and injection booster, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problem of salt resistance restricting the popularization and application of active water, reduce the performance of oil-water interfacial tension, and reduce the effect of increasing injection of active water, etc. problems, to achieve the effect of increasing water phase permeability, improving seepage environment, and good injectability

Active Publication Date: 2022-07-15
北京富达鑫辉能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the formation conditions in the oil field are complex, and there are phenomena of high salinity and high content of divalent ions in the formation water, and high salinity and divalent ion concentration will reduce the performance of the surfactant and reduce the oil-water interface. Tension performance deteriorates, reducing the effect of active water injection, and the lack of salt resistance also restricts the popularization and application of active water injection technology

Method used

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Examples

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preparation example Construction

[0041] Preferably, the preparation method of the alkyl-modified polyoxometalate comprises the following steps:

[0042] S1. Dissolve the cationic surfactant in a low-polarity organic solvent with a dissolution ratio of 1-10 mg / mL to obtain solution A; dissolve the polyoxometalate in deionized water with a dissolution ratio of 1-10 mg / mL , to obtain solution B, add the solution A dropwise to the solution B while stirring to obtain a mixed solution, continue to stir the mixed solution for 30-60 min, separate the organic phase after standing, add anhydrous sodium sulfate to dry, After filtration, the solvent was evaporated to obtain product A;

[0043]The cationic surfactant is alkylammonium bromide, the low-polarity organic solvent is acetone, chloroform, dichloromethane, benzene or toluene, and the polyoxometalate is phosphotungstate, silico-molybdate , phosphomolybdate or silicotungstic acid salt, in the mixed solution, the ratio of the cationic charge of the surfactant to th...

Embodiment 1

[0059] A nano-emulsion injection enhancer for water injection, in parts by weight, comprises the following components:

[0060] 2 parts of lauryl alcohol, 10 parts of anionic surfactant, 10 parts of SB-12 (dodecyl sulfobetaine), 30 parts of AEO-9 (polyoxyethylene ether fatty alcohol), 70 parts of alcohol-based solution;

[0061] The anionic surfactant is a mixture of sodium dodecylbenzenesulfonate (LAS), sodium dodecyl sulfate (K12) and alkyl-modified phosphomolybdate, and the mass ratio is 1:1:1.4;

[0062] The preparation method of the alkyl-modified polyoxometalate comprises the following steps:

[0063] S1. Dissolve dioctadecyl dimethyl ammonium bromide in chloroform at a dissolution ratio of 5 mg / mL to obtain solution A; dissolve phosphomolybdate in deionized water at a dissolution ratio of 5 mg / mL to obtain a solution B. Add the solution A dropwise to the solution B while stirring, and the mixed volume ratio of the solution A and the solution B is 5:12 to obtain a mixed...

Embodiment 2

[0071] A nano-emulsion injection enhancer for water injection, in parts by weight, comprises the following components:

[0072] 1 part of lauryl alcohol, 8 parts of anionic surfactant, 10 parts of SB-12 (dodecyl sulfobetaine), 25 parts of AEO-9 (polyoxyethylene ether fatty alcohol), and 60 parts of alcohol-based solution;

[0073] The anionic surfactant is a mixture of sodium dodecylbenzenesulfonate (LAS), sodium dodecyl sulfate (K12) and alkyl-modified phosphomolybdate, and the mass ratio is 1:1:1.4;

[0074] The preparation method of the alkyl-modified polyoxometalate comprises the following steps:

[0075] S1. Dissolve dioctadecyl dimethyl ammonium bromide in chloroform at a dissolution ratio of 5 mg / mL to obtain solution A; dissolve phosphomolybdate in deionized water at a dissolution ratio of 5 mg / mL to obtain a solution B. Add the solution A dropwise to the solution B while stirring, and the mixed volume ratio of the solution A and the solution B is 5:12 to obtain a mix...

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Abstract

The invention provides a nano-emulsion injection enhancer for water injection, which belongs to the technical field of water injection development of low-permeability oil reservoirs, and comprises the following components in parts by weight: 0.01-4 parts of a non-polar organic dispersed phase, anionic surface active 1-12 parts of zwitterionic surfactants, 8-16 parts of zwitterionic surfactants, 20-35 parts of non-ionic surfactants, and 35-70 parts of alcohol-based solutions; the non-polar organic dispersed phase is of 6-16 carbon atoms. Long-chain alkane or long-chain alcohol, the anionic surfactant is a mixture of alkyl benzene sulfonate, alkyl sulfate and alkyl-modified polyoxometalate; the nanoemulsion infusion agent of the present invention is easily compatible with water It forms a stable oilfield water injection system with good injectability, which can be used for water injection development of low-permeability oil reservoirs, effectively improving the seepage environment and increasing the water phase permeability.

Description

technical field [0001] The invention relates to the technical field of water injection development of low-permeability oil reservoirs, in particular to a nano-emulsion injection enhancer for water injection and a preparation method thereof. Background technique [0002] Low-permeability reservoirs are an important part of my country's petroleum resources. Most of the low-permeability reservoirs are developed by water flooding. Low-permeability reservoirs generally have the characteristics of small pore throats, low permeability, and large seepage resistance. The initial water injection pressure of some water injection wells is not high, but as the water injection time continues, the water injection pressure rises rapidly, the water injection volume drops rapidly, and even the phenomenon of no water injection occurs, resulting in a rapid decline in oil production. [0003] The reasons for the increasing water injection resistance are: firstly, due to the polarity of the rock ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 张庚娟
Owner 北京富达鑫辉能源科技有限公司
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