Betaine surfactant and preparation method and application thereof

A technology of surfactant and betaine, which is applied in the field of betaine-type surfactant and its preparation, can solve the problems of corrosion equipment, high economic cost, reservoir damage, etc., and achieve ultra-low interfacial tension, high yield and low price cheap effect

Active Publication Date: 2012-08-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical applications, due to the use of a large amount of strong alkali, there are some negative problems: alkali consumption and scaling, reservoir damage, reduction of displacement fluid viscosity, oil-water emulsification, etc., which seriously increase the difficulty and economic cost of the produced fluid.

Method used

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  • Betaine surfactant and preparation method and application thereof
  • Betaine surfactant and preparation method and application thereof
  • Betaine surfactant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The present embodiment provides a kind of betaine type surfactant, and it has following structure:

[0059]

[0060] Wherein, m=6, 7, 8 or 9, n=9, 8, 7 or 6, and m+n=15.

[0061] The above-mentioned betaine type surfactant provided in the present embodiment is prepared according to the following steps:

[0062] (1) Esterification reaction: Mix oleic acid and methanol (excess methanol), add concentrated sulfuric acid or p-toluenesulfonic acid as a catalyst, heat and reflux for 10 hours, cool, and then neutralize with sodium methoxide to a pH value of 8-9, use Wash with water until neutral, dry with anhydrous calcium chloride, and then distill under reduced pressure to obtain methyl oleate;

[0063] (2) Friedrich's alkylation reaction: In a sealed reaction kettle, add 3.5mol m-xylene and 0.75mol methanesulfonic acid, blow with nitrogen for 10min at room temperature, and then raise the temperature to 110-130°C under 0.15MPa , then dropwise add the methyl oleate that 1...

Embodiment 2

[0080] The present embodiment provides a kind of betaine type surfactant, and it has following structure:

[0081]

[0082] The above-mentioned betaine type surfactant provided in the present embodiment is prepared according to the following steps:

[0083] Step 1-4 is identical with embodiment 1;

[0084] (5) Quaternization reaction: under the reaction conditions of 130°C and 0.3MPa, using methanol as a solvent, the reaction product of step (4) xylene α-octadecyl tertiary amine reacts with sodium chloroacetate to generate the target betaine type surfactant, its hydrogen spectrum is as follows Figure 7a As shown, the assignment of its hydrogen spectrum signal is as follows Figure 7b shown.

[0085] Industrial Applicability

experiment example

[0087] (1) Ultra-low interfacial tension experiment of binary system oil displacement agent

[0088] The target product of embodiment 2 is mixed with oil and water of Daqing No. 6 Plant to test its interfacial activity, and the test results are as follows: Figure 8 Shown, wherein, binary system is the binary aqueous solution of polymer and surfactant, and polymer is hydrophobic polyacrylamide, and molecular weight is 19 million, and concentration is 2000ppm, and surfactant is the betaine type surface that embodiment 1 provides active agent. The interfacial tension of the surfactant concentration in the binary system can reach ultra-low in the range of 0.05wt%-0.3wt%, which also shows that the synthesized betaine-type surfactant has excellent performance in kilogram samples.

[0089] (2) Ultra-low interfacial tension experiment of one-component system

[0090] The aryl alkyl betaine surfactant provided by the present invention has excellent ability and effect of reducing int...

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Abstract

The invention relates to a betaine surfactant and a preparation method and application thereof. The betaine surfactant is shown as a formula I, wherein the m is 0 or a positive integer, the n is 0 or a positive integer, the m and the n cannot be 0 simultaneously, the R1 is hydrogen (H) or alkyl, the R2 is H or alkyl, the R3 is alkyl and the R4 is alkyl. The invention further provides a preparation method of the betaine surfactant and application of the betaine surfactant in tertiary oil recovery as a surfactant of a binary compound oil-displacing agent. The betaine surfactant has strong temperature resistance, mineralization resistance and dilution resistance and wide application prospect in the field of the tertiary oil recovery.

Description

technical field [0001] The invention relates to the field of surfactants, in particular to betaine surfactants and their preparation methods and applications. Background technique [0002] At present, my country's main oil fields (Daqing, Shengli, Liaohe, etc.) have entered the late stage of secondary oil recovery, and the main characteristics are high water cut and extremely high water cut. In order to improve the recovery rate of existing oil fields, the development and application of tertiary oil recovery technology is imperative Row. [0003] Chemical composite flooding technology is a new technology for tertiary oil recovery developed in the 1980s. It is characterized by the use of organic composites of alkali, surfactants and polymers to exert the synergistic effect of each component. Significantly reduce the oil-water interfacial tension, improve the microscopic oil displacement efficiency, and at the same time increase the viscosity of the displacement fluid, which h...

Claims

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Application Information

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IPC IPC(8): C09K8/584C07C309/14C07C303/32C07C229/14C07C227/08
Inventor 刘春德袁士义王德民宋新民
Owner PETROCHINA CO LTD
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