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Oil displacing composition containing sulphobetaine type surfactant and preparation method and application thereof

A sulfobetaine-type surfactant technology, which is applied to oil displacement compositions containing sulfobetaine-type surfactants and its preparation and application fields, can solve problems such as injection difficulties and formation plugging, and achieve interfacial activity High, strong oil washing ability, simple system effect

Active Publication Date: 2019-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 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 can easily cause formation plugging and injection difficulties in medium and low permeability reservoirs. Oil 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 displacing composition containing sulphobetaine type surfactant and preparation method and application thereof
  • Oil displacing composition containing sulphobetaine type surfactant and preparation method and application thereof
  • Oil displacing composition containing sulphobetaine type surfactant and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1. Surfactant Preparation

[0035](1) palmitic acid amide sulfonate betaine surfactant (R 1 =C 15 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 3 h 6 O) Preparation

[0036] 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 system ...

Embodiment 2

[0048] 1. Surfactant Preparation

[0049] (1) Erucamide sultaine surfactant (R 1 =C 21 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0050] 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 temperature of the syst...

Embodiment 3

[0055] 1. Surfactant Preparation

[0056] (1) triacic acid amide sulfobetaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0057] 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 reaction t...

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Abstract

The invention relates to an oil displacing composition containing a sulphobetaine type surfactant and a preparation method and application thereof. The problems that through existing production technologies, 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 displacingcomposition contains the 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 and vinyl, R3 and R4 are selected from any one of C1-C12 alkylene and hydroxyl-substituted alkylene, the sum of m and n is 0-100, and the sum of x and y is 0-100; the molar ratio ofthe 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 beused 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 sulfobetaine type surfactant, a preparation method and an application thereof. Background technique [0002] Chemical flooding is the main method of tertiary oil recovery, and surfactant flooding is considered to be a chemical agent that can greatly increase oil recovery, has a wide range of applications, and has the most development prospects. Surfactant plays an inestimable role in greatly enhancing oil recovery, whether it is used as a main agent or as an auxiliary agent for oil displacement. [0003] The main mechanism for the use of surfactants to enhance oil recovery is: after the oil field enters the high water cut period, the remaining oil is trapped in the pores of the reservoir rock in a discontinuous oil film, and the two main mechanisms acting on the oil droplets The force is viscous force and capillary force. If a suitable surfactant system is selected, the interfacial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/86E21B43/22
CPCC09K8/584C09K8/602C09K8/86E21B43/16
Inventor 王辉辉沙鸥虞辰敏李斌
Owner CHINA PETROLEUM & CHEM CORP
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