Surfactant flooding system and application thereof

A technique 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 good emulsification performance and low-cost finished products Effect

Active Publication Date: 2013-04-17
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 Technology Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5 L, add 1% isopropanol, stir thoroughly for 30 minutes to dissolve completely, and then Add 1% nonionic surfactant isomerized decanol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 1% anionic sulfonate gemini surfactant N, N'-dilauric Sodium acyl ethylenediamine diethylsulfonate (Gemini, Xi'an Chulongda Chemical Co., Ltd.), stirred well, and finally added water and stirred for 1 hour to obtain the oil displacement product.

[0017] Interfacial tension test:

[0018] 1. Test instrument: TX500TM automatic rotating drop interfacial tensiometer

[0019] 2. Temperature: 60°C

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

[0021] 4. Water: inject water

[0022] 5. Oil displacement agent composition: anionic-nonionic surfactant sy...

Embodiment 2

[0030] Product preparation:

[0031] Under normal temperature and pressure, add 2% anionic surfactant sodium petroleum sulfonate (Panjin Wuyuan Technology Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5 L, add 2% isopropanol, stir thoroughly for 30 minutes to dissolve completely, and then Add 1% nonionic surfactant isomerized decanol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 1% anionic sulfonate gemini surfactant N, N'-dilauric Sodium acyl ethylenediamine diethylsulfonate (Gemini, Xi'an Chulongda Chemical Co., Ltd.), stirred well, and finally added water and stirred for 1 hour to obtain the oil displacement product.

[0032] Interfacial tension test:

[0033] 1. Test instrument: TX500TM automatic rotating drop interfacial tensiometer

[0034] 2. Temperature: 60°C

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

[0036] 4. Water: inject water

[0037] 5. Oil displacement agent composition: anionic-nonionic surfactant sy...

Embodiment 3

[0045] Product preparation:

[0046] Under normal temperature and pressure, add 3% anionic surfactant sodium petroleum sulfonate (Panjin Wuyuan Technology Industry and Trade Co., Ltd.) into a reaction kettle with a capacity of 5 L, add 3% isopropanol, stir thoroughly for 30 minutes to dissolve completely, and then Add successively 0.5% of 1% nonionic surfactant isomeric decanol polyoxyethylene ether (LT-601, Shanghai Boyihe Chemical Co., Ltd.), 0.5% of anionic sulfonate gemini surfactant N, N' -Sodium bislauroyl 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] Interfacial tension test:

[0048] 1. Test instrument: TX500TM automatic rotating drop interfacial tensiometer

[0049] 2. Temperature: 60°C

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

[0051] 4. Water: inject water

[0052] 5. Oil displacement agent composition: anionic-nonioni...

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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 prolongation of development time, most domestic oilfields have entered the later stage of development, and the control degree of water flooding is low. After water flooding, there are 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 porous media to flow, and it is also an effective way to greatly increase oil recovery. The oil displacement 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 due to simple surfactants...

Claims

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Application Information

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Patent Type & Authority Applications(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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