A decompression and injection-stimulation gemini surfactant system for oil fields and a preparing method thereof

A twin-type, surfactant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor effect of measures, reduced water injection capacity, high water injection pressure, etc., to increase the water flooding swept area and swept The effect of high volume, high permeability and high oil washing efficiency

Inactive Publication Date: 2019-01-01
东营利丰化工新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the middle and later stages of oilfield exploitation, many wells were acidified many times but the measures were not effective. Some wells were acidified and fractured. Reservoirs cause great damage, resulting in reduced water injection capacity. During the water injection process, there will be problems such as high water injection pressure, failure to inject, and insufficient injection.

Method used

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  • A decompression and injection-stimulation gemini surfactant system for oil fields and a preparing method thereof
  • A decompression and injection-stimulation gemini surfactant system for oil fields and a preparing method thereof
  • A decompression and injection-stimulation gemini surfactant system for oil fields and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Under normal temperature and pressure, add 35kg of water into the reaction kettle, start stirring, then add 40kg of heterogemini amphoteric surfactant (Xi'an Dingbowei Environmental Protection Technology Co., Ltd. Penetration King), and fully stir for 20 minutes;

[0026] (2) After stirring evenly, add 20 kg of nonionic amphoteric surfactant (carboxylate symmetric type succinic acid diester gemini surfactant), and continue to stir for 20 minutes;

[0027] (3) Add 5 kg of anionic surfactant sodium dodecylbenzenesulfonate after fully stirring, and continue stirring for 30 minutes to obtain the pressure-reducing and increasing-injection surfactant product.

Embodiment 2

[0029] (1) Under normal temperature and pressure, add 40kg of water into the reaction kettle, start stirring, then add 30kg of heterogemini amphoteric surfactant (Xi'an Dingbowei Environmental Protection Technology Co., Ltd. Osmotic King), and fully stir for 15 minutes;

[0030] (2) After stirring evenly, add 25 kg of nonionic amphoteric surfactant (biquaternary ammonium carboxymethyl sodium salt amphoteric gemini surfactant) and continue to stir for 25 minutes;

[0031] (3) After fully stirring, add 5 kg of anionic surfactant sodium diisobutylnaphthalene sulfonate, and continue stirring for 35 minutes to obtain the depressurizing and increasing injection surfactant product.

Embodiment 3

[0033] (1) Under normal temperature and pressure, add 39kg of water into the reaction kettle, start stirring, then add 45kg of heterogemini amphoteric surfactant (Xi’an Dingbowei Environmental Protection Technology Co., Ltd. Penetration King), and fully stir for 25 minutes;

[0034] (2) After stirring evenly, add nonionic amphoteric surfactant (biquaternary ammonium carboxymethyl sodium salt amphoteric gemini surfactant) 15kg, continue to stir for 15 minutes;

[0035] (3) After fully stirring, add 1 kg of anionic surfactant α-olefin sulfonate sodium, and continue stirring for 25 minutes to obtain the pressure-reducing and increasing injection surfactant product.

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Abstract

A decompression and injection-stimulation gemini surfactant system for oil fields and a preparing method thereof are provided. The system is a mixed system consisting of a heterogemini amphoteric surfactant as a main component, a nonionic amphoteric gemini surfactant as an auxiliary agent, an anionic surfactant and water. Compared with products in the prior art, the system has a wide spectrum anda wide adaption range; the system has a wide application concentration range, and the interfacial tension of the system can still be 10<-3> mN / m with a low application concentration (0.1%); the systemhas good wettability, high permeability, high oil washing efficiency, and good salt resistance, and is free of precipitate and turbid phenomena in an aqueous solution having a salt content of 100,000ppm (with the content of calcium and magnesium ions being 5,000 ppm); the system is resistant to high temperature and wide in application temperature range; the system is neutral, free of organochlorine and free of alkali and does not cause harm to stratums; and the system can greatly reduce water injection pressure for a water injection well and increase the water injection efficiency.

Description

technical field [0001] The invention provides a Gemini surfactant system for reducing pressure and increasing injection for water injection wells in the petroleum industry and a preparation method thereof. Specifically, it is a broad-spectrum, salt-resistant, temperature-resistant, organic chlorine-free, alkali-free, no damage to the formation, suitable for all oil fields such as carbonates and sandstones, including small fault block oil fields, low permeability oil fields, Gemini surfactant system for pressure-reducing and injection-increasing in ultra-low permeability oilfields and its preparation method. Background technique [0002] In the middle and later stages of oilfield exploitation, many wells were acidified many times but the measures were not effective. Some wells were acidified and fractured. Reservoirs cause great damage, resulting in reduced water injection capacity. During the water injection process, there will be problems such as high water injection press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 许人军徐天申王永辉丁解放董建荣孙洪莉徐倩男
Owner 东营利丰化工新材料有限公司
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