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Oil displacement composition containing carboxybetaine surfactant, preparation method and application thereof

A technique for surfactants and compositions, which is applied to oil displacement compositions containing carboxybetaine surfactants and their preparation and application fields, can solve problems such as injection difficulties and formation plugging, and achieve high interfacial activity and oil washing The effect of strong ability and good technical effect

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the problem that the polymer in the compound flooding of the current production technology is likely to cause formation plugging and difficult injection in medium and low permeability reservoirs. Composition, the surfactant has the characteristics of ultra-low interfacial tension, simple system and high oil displacement efficiency

Method used

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  • Oil displacement composition containing carboxybetaine surfactant, preparation method and application thereof
  • Oil displacement composition containing carboxybetaine surfactant, preparation method and application thereof
  • Oil displacement composition containing carboxybetaine surfactant, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Surfactant Preparation

[0027] (1) palmitic acid amide carboxy betaine amphoteric surfactant (R 1 =C 15 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0028]a) Add long carbon chain hexadecanoic acid methyl ester and the required amount of amidation reagent N,N-bis(2-hydroxyethyl)ethylenediamine into the reaction kettle, react at 130°C for 6 hours, turn on the vacuum pump, and pump Remove excess N,N-bis(2-hydroxyethyl)ethylenediamine, and then heat to 150°C while passing nitrogen into the reactor equipped with condensing device and stirring device, add ethylene oxide after heating for 40 minutes alkanes (2 moles), the temperature was maintained at 150°C and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reaction temperature of the syst...

Embodiment 2

[0040] 1. Surfactant Preparation

[0041] (1) Erucamide carboxy betaine amphoteric surfactant (R 1 =C 21 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 1 ) preparation

[0042] a) Add methyl erucate and the required amount of amidation reagent N,N-bis(2-hydroxyethyl)ethylenediamine into the reaction kettle, react at 145°C for 7 hours, turn on the vacuum pump, and remove excess N , N-bis(2-hydroxyethyl)ethylenediamine to obtain the erucic acid acyl tertiary amide product, and then heat to 150°C while passing nitrogen into the reactor equipped with a condensation device and a stirring device, after heating for 40 minutes Ethylene oxide (2 moles) was added, and the temperature was maintained at 150° C. and the reaction was stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reaction tempe...

Embodiment 3

[0047] 1. Surfactant Preparation

[0048] (1) triacic acid amide carboxy betaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 \R 4 =C 2 , R 5 =C 1 ) preparation

[0049] a) Add the long carbon chain triacic acid methyl ester and the required amount of amidating reagent N,N-bis(2-hydroxyethyl)propylenediamine into the reaction kettle, react at 150°C for 8 hours, turn on the vacuum pump, and pump Remove excess N,N-bis(2-hydroxyethyl)propylenediamine to obtain triacyl acyl tertiary amine product, and then heat to 150°C while blowing nitrogen into a reactor equipped with a condensing device and a stirring device After heating for 40 minutes, ethylene oxide (2 moles) was added, and the temperature was maintained at 150° C. and stirred for 1 hour. Cool down to 80°C, add barium hydroxide as a catalyst, heat to 140°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, and then use nitrogen to blow 4 times to remove the air in the system, and then adjust the reactio...

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Abstract

The invention relates to an oil displacing composition containing a carboxyl betaine type surfactant and a preparation method and application thereof. The problems that in the prior art, macromolecular polymers in combination flooding are prone to causing reservoir blocking and difficult injection in medium-low-permeability oil reservoirs are mainly solved. The oil displacing composition containsthe betaine type ampholytic surfactant and inorganic salts, wherein the structure of the betaine type ampholytic surfactant is shown in the formula (I), R1 is selected from any one of C6-C29 alkyl andvinyl, R3 and R4 are selected from any one of C1-C12 alkylene and hydroxyl-substituted alkylene, and the inorganic salts are at least one of a halide, carbonate, bicarbonate, sulfate, sulfite and nitrate; the molar ratio of the betaine type ampholytic surfactant to the inorganic salts is 1: 0.01 to 1: 100. By means of the technical scheme, the technical problems are well solved, and the oil displacing composition can be used for oil displacing production of oil fields. Please see the specification for the formula (I).

Description

technical field [0001] The invention relates to an oil displacement composition containing a carboxybetaine type surfactant, a preparation method and an application thereof. Background technique [0002] Among tertiary oil recovery technologies, chemical flooding is the main technology and direction of enhanced oil recovery in my country, including alkaline water flooding, surfactant flooding (micelle flooding and microemulsion flooding), polymer flooding and composite flooding. Among them, the polymer flooding technology mainly uses the fluidity control function of the polymer to achieve the purpose of enhancing the recovery by increasing the swept volume, and the range of the enhanced recovery reaches more than 10%. ASP flooding mainly utilizes the fluidity control of polymer and the synergistic effect of surfactant and alkali to reduce interfacial tension and achieve the purpose of enhancing oil recovery. Surfactant flooding at home and abroad uses mostly anionic surfact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C07C231/12C07C233/36C07C233/38
CPCC09K8/584C09K2208/10
Inventor 王辉辉李应成何秀娟翟晓东
Owner CHINA PETROLEUM & CHEM CORP
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