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Surfactant flooding system and application thereof

A technology of surfactant flooding and surfactant, which is applied in the field of surfactant systems for tertiary oil recovery, can solve problems such as water sensitivity enhancement, formation damage, and impact on sustainable development of oil, and achieve low-cost finished products and good emulsification performance Effect

Active Publication Date: 2015-01-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to reduce the oil-water interface to 10 due to simple surfactants -3 Below mN / m, the commonly used surfactant systems in the past, such as alkali-surfactant-polymer (ASP) ASP flooding, foam composite flooding, etc., in the ASP system technology, scaling occurs due to the presence of alkali , clay swelling, water sensitivity enhancement and a series of problems, thus causing greater damage to the formation and seriously affecting the sustainable development of petroleum

Method used

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  • Surfactant flooding system and application thereof
  • Surfactant flooding system and application thereof
  • Surfactant flooding system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Product preparation:

[0016] Under normal temperature and pressure, add 1% anionic surfactant sodium petroleum sulfonate (Panjin Wuyuan Science & Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5L, add 1% isopropanol, stir well for 30 minutes to dissolve completely, and then Sequentially add 1% nonionic surfactant isomerized deca alcohol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 1% anionic sulfonate gemini surfactant N, N'-dilaurel Acyl ethylene diamine diethane sulfonate (Gemini, Xi'an Chulongda Chemical Co., Ltd.), stir well, and finally add water and stir for 1 hour to obtain the oil displacement product.

[0017] Interface tension test:

[0018] 1. Testing instrument: TX500TM automatic rotating drop interfacial tension meter

[0019] 2. Temperature: 60℃

[0020] 3. Crude oil: 6 layers of crude oil

[0021] 4. Water: inject water

[0022] 5. Oil-displacing agent composition: anionic-nonionic surfactant system

[0023] The effec...

Embodiment 2

[0030] Product preparation:

[0031] Under normal temperature and pressure, add 2% anionic surfactant sodium petroleum sulfonate (Panjin Wuyuan Science & Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5L, add 2% isopropanol, stir well for 30 minutes to dissolve completely, and then Sequentially add 1% nonionic surfactant isomerized deca alcohol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 1% anionic sulfonate gemini surfactant N, N'-dilaurel Acyl ethylene diamine diethane sulfonate (Gemini, Xi'an Chulongda Chemical Co., Ltd.), stir well, and finally add water and stir for 1 hour to obtain the oil displacement product.

[0032] Interface tension test:

[0033] 1. Testing instrument: TX500TM automatic rotating drop interfacial tension meter

[0034] 2. Temperature: 60℃

[0035] 3. Crude oil: 6 layers of crude oil

[0036] 4. Water: inject water

[0037] 5. Oil-displacing agent composition: anionic-nonionic surfactant system

[0038] The effec...

Embodiment 3

[0045] Product preparation:

[0046] Under normal temperature and pressure, add 3% of anionic surfactant sodium petroleum sulfonate (Panjin Wuyuan Science & Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5L, add 3% of isopropanol, fully stir for 30min to dissolve completely, and then Add 0.5% of 1% nonionic surfactant isomerized deca alcohol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 0.5% of anionic sulfonate gemini surfactant N, N'in turn -Sodium dilauroyl ethylenediamine diethanesulfonate (Gemini, Xi'an Chulongda Chemical Co., Ltd.), stir well, and finally add water and stir for 1 hour to obtain the oil displacement product.

[0047] Interface tension test:

[0048] 1. Testing instrument: TX500TM automatic rotating drop interfacial tension meter

[0049] 2. Temperature: 60℃

[0050] 3. Crude oil: 6 layers of crude oil

[0051] 4. Water: inject water

[0052] 5. Oil-displacing agent composition: anionic-nonionic surfactant system

[0053...

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Abstract

The invention relates to a surfactant flooding system and application thereof. The surfactant flooding system comprises the following materials in percentage by weight: 1-4% of sodium petroleum sulfonate, 0.5-1% of isomeric alcohol ethoxylate, 0.5-1% of N,N'-dilauroyl-ethylenediamine-sodium diethanesulfonate, 1-4% of organic cosolvent isopropanol and the balance of water, and the sum of the weight percents of all the materials is 100%. In the wide concentration range (0.1-0.5%) of the surfactant, the oil-water interfacial tension can be reduced to an ultralow value at such order of magnitude as 10<-3> mN / m, the field experiment effect is remarkable, and the system is resistant to temperature (80 DEG C) and can be slightly influenced by the change of temperature.

Description

Technical field [0001] The invention belongs to the field of chemical flooding for improving oil recovery of oil reservoirs, and relates to a surfactant system for tertiary oil recovery. Background technique [0002] With the extension of development time, most of the domestic oil fields have entered the late stage of development, and the degree of water flooding control is low. After water flooding, there is generally more than 50% of residual oil in the reservoir. Therefore, the application of tertiary oil recovery technology is becoming more and more extensive Attention. Reducing the interfacial tension is the only way to force the residual oil trapped in the porous medium to flow, and it is also an effective method that can greatly increase the oilfield recovery. The oil-displacing agent must reduce the oil-water interfacial tension to 10 -3 mN / m or lower order of magnitude, otherwise it has no practical value. It is difficult to reduce the oil-water interface to 10 -3 Below...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 刘宁杨全安何治武王小勇李宁军董俊周佩杨会丽刘爱华唐泽玮姜毅张振云古正富
Owner PETROCHINA CO LTD
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