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Nano-emulsion augmented injection agent for water injection and preparation method of nano-emulsion augmented injection agent

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: 2021-07-23
北京富达鑫辉能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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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 30-60min, 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, methylene chloride, benzene or toluene, and the polyoxometalate is phosphotungstate, silicon molybdate , phosphomolybdate or silicotungstate, in the mixed solution, the ratio of the cationic charge of the surfactant to the anio...

Embodiment 1

[0059] A nanoemulsion injection booster for water injection, in parts by weight, comprising 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 dodecylsulfate (K12) and alkyl-modified phosphomolybdate, and its mass ratio is 1:1:1.4;

[0062] The preparation method of the polyoxometalate of described alkyl modification comprises the following steps:

[0063] S1. Dissolve dioctadecyldimethylammonium bromide in chloroform at a dissolution rate of 5 mg / mL to obtain solution A; dissolve phosphomolybdate in deionized water at a dissolution rate of 5 mg / mL to obtain a solution B, add the solution A dropwise to the solution B while stirring, the mixing volume ratio of the solution A to the solution B is 5:12, to obtain...

Embodiment 2

[0071] A nanoemulsion injection booster for water injection, in parts by weight, comprising 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), 60 parts of alcohol-based solution;

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

[0074] The preparation method of the polyoxometalate of described alkyl modification comprises the following steps:

[0075] S1. Dissolve dioctadecyldimethylammonium bromide in chloroform at a dissolution rate of 5 mg / mL to obtain solution A; dissolve phosphomolybdate in deionized water at a dissolution rate of 5 mg / mL to obtain a solution B, add the solution A dropwise to the solution B while stirring, the mixing volume ratio of the solution A to the solution B is 5:12, to obtain a...

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Abstract

The invention provides a nano emulsion augmented injection agent for water injection, and belongs to the technical field of low permeability reservoir water injection development, the nano-emulsion augmented injection agent comprises the following components by weight: 0.01-4 parts of a non-polar organic dispersion phase, 1-12 parts of an anionic surfactant, 8-16 parts of a zwitterionic surfactant, 20-35 parts of a nonionic surfactant, and 35-70 parts of an alcohol-based solution; the non-polar organic dispersed phase is long-chain alkane or long-chain alcohol with the carbon atom number of 6-16, and the anionic surfactant is a mixture of alkylbenzene sulfonate, alkyl sulfate and alkyl modified polyoxometallate; the nano-emulsion augmented injection agent and water can easily form a stable oilfield water injection system, and the nano-emulsion augmented injection agent has good injectability, can be used for water injection development of low-permeability reservoirs, effectively improves the seepage environment and improves the water phase permeability.

Description

technical field [0001] The invention relates to the technical field of water injection development of low-permeability reservoirs, in particular to a nanoemulsion injection booster 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 low-permeability reservoirs are mainly developed by water injection. 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 continuous increase of water injection resistance are as follows: first, due to the polar...

Claims

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Application Information

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Patent Type & Authority Applications(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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