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A compound surfactant with ultra-low oil-water interfacial tension and preparation method thereof

A technology of oil-water interfacial tension and surfactant, applied in the field of compound surfactant and its preparation, compound surfactant for oil displacement

Active Publication Date: 2021-09-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a compound surfactant with ultra-low oil-water interfacial tension and its preparation method for the shortcomings of alkylbenzene sulfonate single surfactant system in enhancing oil recovery.

Method used

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  • A compound surfactant with ultra-low oil-water interfacial tension and preparation method thereof
  • A compound surfactant with ultra-low oil-water interfacial tension and preparation method thereof
  • A compound surfactant with ultra-low oil-water interfacial tension and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of a composite surfactant with ultra-low oil-water interfacial tension, comprising the following steps:

[0032] (1) Synthesis of alkylbenzene sulfonate:

[0033] ①Synthesis of light alkylbenzene sulfonate: take 20g of low molecular weight industrial alkylbenzene with a molecular weight of 330, put it in a three-necked bottle, and keep the temperature in an oil bath at 50°C; weigh 50g of fuming sulfuric acid, place Slowly add it dropwise into a three-necked flask to carry out sulfonation reaction, and at the same time carry out magnetic stirring; after reacting for 60 minutes, dissolve the reaction product in 20% sodium hydroxide solution for neutralization reaction to obtain light alkylbenzene Sulfonate;

[0034] ②Synthesis of heavy alkylbenzene sulfonate: Take 20g of high-molecular-weight industrial alkylbenzene with a molecular weight of 410, put it in a three-necked bottle, and keep the temperature in an oil bath at 50°C; weigh 50g of fuming su...

Embodiment 2

[0041] A preparation method of a composite surfactant with ultra-low oil-water interfacial tension, comprising the following steps:

[0042] (1) Synthesis of alkylbenzene sulfonate: same as Example 1.

[0043] (2) Purification of alkylbenzene sulfonate: same as Example 1.

[0044] (3) Preparation of compound surfactant: add purified light alkylbenzene sulfonate, heavy alkyl benzene sulfonate and betaine into brine, stir evenly to obtain compound surfactant; The mass percentage of the components is as follows: 0.2% of light alkylbenzene sulfonate, 0.2% of heavy alkylbenzene sulfonate and 0.15% of betaine, and the balance is brine; the salinity of brine is 5000mg / L.

[0045] (4) Evaluation of interfacial activity: the oil-water interfacial tension of the compound surfactant is 6×10 -4 mN / m.

Embodiment 3

[0047] A preparation method of a composite surfactant with ultra-low oil-water interfacial tension, comprising the following steps:

[0048] (1) Synthesis of alkylbenzene sulfonate: same as Example 1.

[0049] (2) Purification of alkylbenzene sulfonate: same as Example 1.

[0050] (3) Preparation of compound surfactant: add purified light alkylbenzene sulfonate, heavy alkyl benzene sulfonate and betaine into brine, stir evenly to obtain compound surfactant; The mass percentage of the components is as follows: 0.3% of light alkylbenzene sulfonate, 0.3% of heavy alkylbenzene sulfonate and 0.2% of betaine, and the balance is brine; the salinity of brine is 2000mg / L.

[0051] (4) Evaluation of interfacial activity: the oil-water interfacial tension of the compound surfactant is 8×10 -4 mN / m.

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Abstract

The invention discloses a compound surfactant with ultra-low oil-water interfacial tension and a preparation method thereof. The compound surfactant is compounded from the following components: 0.1-0.3% of light alkylbenzene sulfonate , 0.1~0.3% heavy alkylbenzene sulfonate, 0.1~0.2% betaine, and the balance is brine. Each component of the present invention cooperates with each other and acts together under a specific ratio, so that the compound surfactant has excellent interfacial activity, and the oil-water interfacial tension can be reduced to ultra-low (<1×10 ‑3 mN / m), and in a wide range of salinity (500~15000mg / L), all have ultra-low interfacial tension; in addition, the compound system is applicable to a wide range of oil phases, including n-hexane~n-decyl Series of n-alkanes such as hexane and crude oil from various sources can be applied and promoted in the field of oilfield chemical flooding to enhance oil recovery.

Description

technical field [0001] The invention relates to a compound surfactant for oil displacement, in particular to a compound surfactant with ultra-low oil-water interfacial tension and a preparation method thereof, which belongs to the preparation of oil displacement agent in the process of oil field chemical flooding to enhance oil recovery technology field. Background technique [0002] In the late stage of oilfield development, the water cut increases and the recovery factor decreases. In order to enhance oil recovery, one of the most commonly used methods is chemical flooding. In the field of oilfield chemical flooding, surfactant flooding is the most commonly used method. In recent years, there have been more and more researches on the development and application of surfactants, among which the most widely used is alkylbenzene sulfonate or Petroleum sulfonate. Because the oil-water interfacial tension of a single surfactant system is often difficult to achieve ultra-low (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 王帅王旭生郭勇王磊梁晓静王立成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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