Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition

A technology of surfactant and composition, which is applied in the field of viscoelastic surfactant composition for oil displacement and its preparation and application, can solve the problems of low oil displacement efficiency, achieve high interfacial activity, strong oil washing ability, improve Yield effect

Active Publication Date: 2018-04-17
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 High oil displacement efficiency, especially suitable for Shaqi Oilfield in Jiangsu Oilfield

Method used

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  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition
  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition
  • Viscoelastic surfactant composition for oil displacement as well as preparation method and application of composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Surfactant Preparation

[0029] (1) Erucamide carboxy betaine amphoteric surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 ) preparation

[0030] a) Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 140°C for 8 hours, turn on the vacuum pump, and remove the methanol and Excess N,N-dimethylpropanediamine to obtain erucic acid acyl tertiary amide product, then add the required amount of sodium chloroacetate, react at 75°C for 9 hours, recrystallize and purify with absolute ethanol to obtain a long carbon chain Betaine amphoteric surfactant; wherein, the molar ratio of methyl erucate:N,N-dimethylpropylenediamine:sodium chloroacetate is 1:2.5:1.5.

[0031] b) Naphthalene sulfonate and the erucamide carboxy betaine amphoteric surfactant prepared by the present invention are respectively dissolved in water, stirred for 30 minutes, and formulated into an aqueous solution, and then the...

Embodiment 2

[0040] 1. Surfactant Preparation

[0041] (1) triacic acid amide carboxyl betaine amphoteric surfactant (R 1 =C 29 , R 2 =C 2 , R 3 =C 2 ) preparation

[0042] a) Add 0.5 mole of long-chain triacic acid methyl ester and the required amount of amidating reagent N,N-dimethylethylenediamine into the reaction kettle, react at 130°C for 6 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylethylenediamine to obtain triacyl tertiary amine product, then add the required amount of sodium chloroacetate, react at 85°C for 15 hours, and recrystallize and purify with absolute ethanol Afterwards, a long carbon chain betaine surfactant is obtained; wherein, the molar ratio of triacic acid methyl ester:N,N-dimethylethylenediamine:sodium chloroacetate is 1:2:1.5.

[0043] b) Naphthalene sulfonate and the triacic acid amide carboxy betaine amphoteric surfactant prepared by the present invention are respectively dissolved in water, stirred f...

Embodiment 3

[0047] 1. Surfactant Preparation

[0048] (1) nonanoic acid amide carboxy betaine amphoteric surfactant (R 1 =C 8 , R 2 =C 3 , R 3 =C 3 ) preparation

[0049] a) Add 0.5 mole of nonanoic acid methyl ester and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 135°C for 10 hours, turn on the vacuum pump, and remove the methanol and Excess N,N-dimethylpropanediamine to obtain nonanoic acid acyl tertiary amine product, then add the required amount of β-chloropropionate sodium, react at 75°C for 10 hours, and recrystallize and purify with absolute ethanol A long carbon chain betaine surfactant is obtained; wherein, the molar ratio of methyl nonanoate:N,N-dimethylpropylenediamine:β-sodium chloropropionate is 1:2:1.6.

[0050] b) Naphthalene sulfonate and the nonanoic acid amide carboxy betaine amphoteric surfactant prepared by the present invention are respectively dissolved in water, stirred for 30 minutes, and formulate...

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Abstract

The invention relates to viscoelastic surfactant composition for oil displacement and mainly solves the problems that surfactants have poor oil displacement effects as oil displacing agents in high-temperature medium / low-permeability reservoirs and cause huge damage to stratums and oil wells due to contained alkali in the prior art. The viscoelastic surfactant composition for oil displacement is prepared from an ampholytic surfactant shown in formula (I) and organic acid salt, wherein the organic acid salt is selected from at least one of organic acid salts shown in formula (II); R1 is selected from any one of C8-C29 alkyls and alkenyls, R2 and R3 are independently selected from any one of C1-C5 alkylenes or hydroxyl substituted alkylenes and X is selected from any one of carboxylate and sulfonate radicals, and the molar ratio of the ampholytic surfactant to the organic acid salt is (1:0.01)-(1:100). With the adoption of the technical scheme, the technical problems are better solved, and the composition can be applied to oil displacement production of oil fields.

Description

technical field [0001] The invention relates to the synthesis of a viscoelastic surfactant composition for oil displacement and the application of the composition as an oil displacement agent. Background technique [0002] With the rapid growth of the national economy, the contradiction between domestic oil supply and demand has become increasingly prominent, mainly manifested in relatively poor oil and gas resources, oil exploration and development and proven reserves cannot keep up with the growth of demand, and the degree of crude oil recovery is relatively low. In order to alleviate the shortage of my country's oil resources, reduce the gap in crude oil production, and ensure my country's oil security, one of the important measures to be taken is to greatly increase the recovery rate of my country's crude oil. For example, the current average recovery rate of Sinopec is only 28%, and more than 70% of the oil resources have not been effectively developed and utilized, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/30
Inventor 王辉辉沈之芹何良好翟晓东
Owner CHINA PETROLEUM & CHEM CORP
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