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Polyether carboxylate-containing non-alkali viscoelastic surfactant composition, preparation method and use

A technology of surfactant and polyether carboxylate, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low oil displacement efficiency and achieve high interface activity, simple system and good technical effect 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

[0005] One of the technical problems to be solved by the present invention is the problem of low oil displacement efficiency of surfactants in the prior art under high temperature, medium and low permeability conditions, and a new composition of viscoelastic surfactants is provided, which has Features of high oil displacement efficiency

Method used

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  • Polyether carboxylate-containing non-alkali viscoelastic surfactant composition, preparation method and use
  • Polyether carboxylate-containing non-alkali viscoelastic surfactant composition, preparation method and use
  • Polyether carboxylate-containing non-alkali viscoelastic surfactant composition, preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Surfactant Preparation

[0026] (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

[0027] 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 sys...

Embodiment 2

[0037] 1. Surfactant Preparation

[0038] (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

[0039] 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

[0044] 1. Surfactant Preparation

[0045] (1) triacic acid amide carboxy betaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0046] 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 alkali-free viscoelastic surfactant composition containing polyether carboxylate and a preparation method and application of the alkali-free viscoelastic surfactant composition. The problems that the surfactant used as an oil displacement agent has poor oil displacement effect in the high temperature and the low permeability reservoir, and meanwhile, great damage is brought to the stratum and oil wells due to the fact that alkali is contained in current production technologies are mainly solved. As for the alkali-free viscoelastic surfactant composition containing the polyether carboxylate, according to the technical scheme, the alkali-free viscoelastic surfactant composition containing the polyether carboxylate comprises an ampholytic surfactant shown in a formula (I) and organic acid salt shown in a formula (II) (please see the specifications for the formula (I) and the formula (II)), wherein R1 is selected from any of alkyl and alkenyl of C6-C29, and R2 and R5 are independently selected from any of alkylene and hydroxyl substituted alkylene of C1-C22 correspondingly; and the molar ratio of the ampholytic surfactant to the organic acid salt is 1 to 0.01-1 to100, the technical problem is well solved, and the alkali-free viscoelastic surfactant composition containing the polyether carboxylate can be applied to oil displacement production in an oilfield.

Description

technical field [0001] The present invention relates to a polyether carboxylate-containing non-alkali viscoelastic surfactant composition and its preparation method and application, in particular to a polyether carboxylate-containing non-alkali viscoelastic surfactant suitable for use in low-permeability oil reservoirs Composition and preparation method and use. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. Conventional oil recovery methods (primary and secondary methods) generally only produce 1 / 3 of the crude oil geological reserves, and about 2 / 3 of the crude oil has not been reco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/30
Inventor 王辉辉沈之芹裘鋆马俊伟
Owner CHINA PETROLEUM & CHEM CORP
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