Anion/cation composite surfactant oil displacement agent

A surfactant flooding and surfactant technology, which is applied in the field of surfactants for oil flooding in oil fields, can solve problems such as precipitation and flocculation that are prone to occur

Active Publication Date: 2015-05-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the anion / cation surfactant complex system has excellent synergistic effect, it is easy to cause precipitation and flocculation due to the strong charge effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 0.5 part of cetyltrimethylammonium bromide and 3 parts of sorbitan oleate according to the mass ratio, put them in a three-necked flask with a stirrer, stir for 20 minutes, add 2 parts of methanol and stir for 20 minutes. Add 4 parts of petroleum sodium sulfonate and 1 part of deionized water and stir for 30 minutes until a transparent liquid is formed, and a light yellow product is obtained, which is a novel anionic / cationic composite surfactant oil-displacing agent. The surface tension of the prepared surfactant composite system is 33mN / m, and the oil-water interfacial tension is 0.0024mN / m.

Embodiment 2

[0016] Take 1 part of cetyltrimethylammonium chloride and 4 parts of sorbitan oleate according to the mass ratio, put them in a three-necked flask with a stirrer, stir for 20 minutes, add 3 parts of methanol and stir for 20 minutes. Add 4 parts of sodium dodecylbenzene sulfonate, 2 parts of fatty alcohol polyoxyethylene sodium sulfate and 2 parts of deionized water and stir for 30 minutes until a transparent liquid is formed, and a light yellow product is obtained, which is a new type of anionic / cationic composite surfactant Oil-displacing agent. The surface tension of the prepared surfactant composite system is 31mN / m, and the oil-water interfacial tension is 0.0018mN / m.

Embodiment 3

[0018] Take 1 part of octadecyltrimethylammonium chloride and 5 parts of nonylphenol polyoxyethylene ether according to the mass ratio and place them in a three-necked flask with a stirrer, stir for 20 minutes, add 4 parts of ethanol and stir for 20 minutes, Add 6 parts of sodium lauryl sulfate, 4 parts of sodium alkyl diphenyl ether disulfonate and 2 parts of deionized water and stir for 30 minutes until a transparent liquid is formed, and a light yellow product is obtained, which is a new type of anionic / cationic composite surfactant Oil-displacing agent. The surface tension of the prepared surfactant composite system is 32mN / m, and the oil-water interfacial tension is 0.0022mN / m.

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PUM

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Abstract

The invention relates to an anion / cation composite surfactant oil displacement agent, which is prepared by compounding an anionic surfactant, a cationic surfactant, a nonionic surfactant, small molecular alcohol cosurfactant and deionized water according to a mass ratio of (4-10):(0.5-1):(2-5):(2-5):(1-2). The oil displacement agent provided by the invention not only has low surface tension and low oil-water interfacial tension, but also has good emulsifying stability on crude oil. A 0.15% oil displacement agent water solution is prepared, a Sweden Biolin Sigma701 type surface tension meter is employed for test at a temperature of 25DEG C, and the low surface tension evaluation standard is a surface tension of lower than or equal to 38mN / m.

Description

Technical field [0001] The invention belongs to the field of surfactants for oilfield flooding, and particularly relates to an anionic and cationic composite surfactant oil-displacing agent. Background technique [0002] In traditional concepts, the combination of cationic surfactants and anionic surfactants will produce precipitation or flocculent complexes due to the interaction in the aqueous solution, resulting in negative effects and even loss of surface activity of the surfactants. Studies have found that under certain conditions, the anionic / cationic surfactant compound system has a high surface activity and shows a great synergistic effect. The combination of anionic / cationic surfactants can greatly increase the surface activity due to the strong electrical interaction between the two. The anionic / cationic surfactant composite system has the following advantages: ① It can effectively reduce the critical micelle concentration CMC; ② It can greatly improve the solubility o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 赵文李书静张昊李斌杨剑张育超侯军刚康帅马力胡剑黄先利
Owner PETROCHINA CO LTD
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