Compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof

A technology of double long-chain alkylmethyl carboxyl and long-chain alkyl dimethyl carboxyl, which is applied in the field of compound oil displacement agents and can solve problems such as poor water solubility

Inactive Publication Date: 2015-09-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the product has poor water solubility ...

Method used

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  • Compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof
  • Compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof
  • Compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: N-octadecyl-N-hexylmethyl tertiary amine (C 18+6 A) Preparation. With stearic acid (C 18 ) is the initial raw material, called reactant A, reacts with thionyl chloride, and thionyl chloride is called reactant B. According to the molar ratio A:B=1:1.4, add 0.5mol (142g) A, 1mL N,N-dimethylformamide (DMF), 50mL dichloromethane into a 500mL three-necked flask, and heat to 55°C. Weigh 0.7mol (83.3g) B in a beaker, quickly transfer it to a 250mL constant pressure funnel, and dropwise add it to a three-necked flask. HCl and SO produced by the reaction 2 The acid gas is absorbed and treated with 700mL 10% NaOH aqueous solution. After the addition of B was completed, the temperature was raised to 65°C, and the reaction was continued for 2h. After the reaction, use a circulating water vacuum pump to extract the residual B and dichloromethane while it is hot (50-60° C.) to obtain the intermediate product stearoyl chloride, which is called intermediate C. The r...

Embodiment 2

[0045] Embodiment 2: N-octadecyl-N-hexylmethylcarboxybetaine (C 18+6 B) Preparation. According to the molar ratio I:(chloroacetic acid)=1:1.1, add 0.05mol tertiary amine and 10mL aqueous solution dissolved with 0.055mol chloroacetic acid into a 250mL three-necked flask, stir vigorously and slowly raise the temperature to 80°C. According to the molar ratio (chloroacetic acid): NaOH = 1:1.1, add 10 mL of an aqueous solution dissolved with 0.0605 mol of NaOH into the three-necked flask dropwise within 0.5 to 1 h. After the dropwise addition, the temperature of the material was raised to reflux temperature (100° C.) to continue the reaction for 10 h. After the reaction was finished, 20% chloroacetic acid and a corresponding amount of NaOH were added, and the reaction was continued for 4 hours to obtain the target product (J). The yield is about 80%, and the reaction formula is as follows:

[0046]

[0047] Purification of the product: After the reaction is completed, add an ...

Embodiment 3

[0048] Embodiment 3: N-octadecyl-N-hexylmethylcarboxybetaine (C 18+6 B) Structural characterization. For purified products (C 18+6 B) Structural characterization by infrared spectroscopy, mass spectrometry and NMR.

[0049] figure 1 It is the infrared spectrogram of the purified product (J). at 1643cm -1 The absorption peak at is the stretching vibration of the C=O bond, 1305cm -1 The absorption peak at is the stretching vibration of C–O, indicating that there is a –COO- group in the structure. 2927cm -1 and 2856cm -1 The absorption peaks are the asymmetric and symmetric stretching vibrations of the C-H bond, respectively, at 1469cm -1 and 1394cm -1 is the bending vibration of the C-H bond, 727cm -1 It is the bending vibration of the long-chain alkyl group, which matches the length of the two long-chain alkyl groups in the molecule. 1076cm -1 and 885cm -1 The weaker absorption bands at are the stretching and bending vibrations of the C-N bond, respectively.

[00...

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Abstract

The invention relates to a compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof, and belongs to the technical field of chemical oil displacement. The asymmetric di-long chain alkylmethyl carboxyl betaine is prepared by adopting fatty acids with different chain lengths and monomethylamine as original raw materials by means of amide reduction and carboxymethylation, and a molecular formula of the asymmetric di-long chain alkylmethyl carboxyl betaine is abbreviated as Cm+nB, wherein m is not equal to n. Compared with the symmetric di-long chain alkylmethyl carboxyl betaine identical in main alkyl chain length, the asymmetric betaine basically maintains high surface activity of the symmetric betaine, but the water solubility of the product is remarkably improved, and the adsorption onto the surface of rock is obviously lowered. The interface tension between C7-C9 n-alkanes and Daqing formation water and between Daqing crude oil and Daqing formation water is respectively reduced to 10<-3>mN/m and 10<-2>mN/m by virtue of C18+6B single component; the asymmetric di-long chain alkylmethyl carboxyl betaine is compounded with a symmetric homologous series and a single-long-chain alkyl-dimethyl carboxyl betaine, the interface tension of Daqing crude oil/formation water is lowered to 10<-3>mN/m in a wide range of total concentration.

Description

technical field [0001] The invention relates to a compound oil displacement agent for alkali-free binary compound flooding, which contains an asymmetric double-long-chain alkylmethyl carboxy betaine surfactant, and belongs to the technical field of chemical oil displacement. Background technique [0002] As we all know, many old oilfields in my country have successively entered the high water cut period, and the water content in the water flooding production fluid has reached more than 90%, facing the natural decline of crude oil production. On the other hand, there are still about 60% of the residual oil that has not been produced. , so the use of tertiary oil recovery technology to further enhance the recovery after the water flooding stage is the only way for my country's old oilfields to stabilize and increase production. [0003] In the late stage of water flooding, residual oil is trapped in the pores of porous rocks in the form of oil droplets, and due to capillary act...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 崔正刚宋洪娟宋冰蕾裴晓梅
Owner JIANGNAN UNIV
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