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Alkali-free viscoelastic surfactant composition and its preparation method and application

A technology of surfactant and composition, applied in the field of preparation of alkali-free viscoelastic surfactant, can solve problems such as formation blockage and injection difficulty, and achieve the effects of reducing repulsion, high interfacial activity, and reducing critical micelle concentration

Active Publication Date: 2020-08-07
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 that the polymers in the existing chemical flooding are used in the process of flooding low-permeability reservoirs to easily cause formation plugging and difficult injection problems. A new combination of viscoelastic surfactants is provided. The surfactant has the characteristics of high oil displacement efficiency under the condition of high temperature and low permeability, especially suitable for Shaqi Oilfield of Jiangsu Oilfield

Method used

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  • Alkali-free viscoelastic surfactant composition and its preparation method and application
  • Alkali-free viscoelastic surfactant composition and its preparation method and application
  • Alkali-free viscoelastic surfactant composition and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1. Surfactant Preparation

[0032] (1) Erucamide carboxy betaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 ) preparation

[0033] 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 surfactant; Wherein, methyl erucate: N, N-dimethylpropylenediamine: the mol ratio of sodium chloroacetate is 1:2.5:1.5.

[0034] b) Naphthalene sulfonate and the erucamide carboxy betaine surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and formulated into an aqueous solution, and then the above-mentioned surfactant was...

Embodiment 2

[0043] 1. Surfactant Preparation

[0044] (1) triacic acid amide carboxy betaine surfactant (R 1 =C 29 , R 2 =C 2 , R 3 =C 2 ) preparation

[0045] 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.

[0046] b) Naphthalene sulfonate and the triacic acid amide carboxy betaine surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and for...

Embodiment 3

[0050] 1. Surfactant Preparation

[0051] (1) nonanoic acid amide carboxy betaine surfactant (R 1 =C 8 , R 2 =C 3 , R 3 =C 3 ) preparation

[0052] 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.

[0053] b) Naphthalene sulfonate and the nonanoic acid amide carboxyl betaine surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and formulated into an aqueous so...

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Abstract

The invention relates to a preparation method and an application of alkali-free viscoelastic surfactant composition and mainly solves the problem of poor flooding effect of an existing flooding systemunder the condition of the high-temperature and low-permeability reservoir. According to the technical scheme, the alkali-free viscoelastic surfactant composition is prepared from a betaine surfactant, an anionic surfactant and water, wherein the betaine surfactant is represented as the formula (I) in the description; the anionic surfactant is selected from at least one of structures shown as theformula (II) in the description; in the formula (I), R1 is selected from any one of C8-C29 alkyl and alkenyl, and R2 and R3 are independently selected from C1-C5 alkylidene and hydroxyl substituted alkylidene; in the structural formula (II), X is selected from at least one of carboxylate radical and sulfonate radical. With the adoption of the technical scheme that the mole ratio of an ampholyticsurfactant to the anionic surfactant is 1:0.01-1:100, the technical problem is solved better, and the alkali-free viscoelastic surfactant composition can be applied to tertiary oil recovery of an oilfield.

Description

technical field [0001] The invention relates to a preparation method and application of an alkali-free viscoelastic surfactant in low-permeability oil reservoirs. Background technique [0002] Among Sinopec's newly proven petroleum geological reserves, low-permeability reservoirs account for as high as 60% to 70%. Low-permeability reservoirs will be the main resource base for increasing reserves and production for a long period of time in the future. In recent years, with the reduction of recoverable reserves of medium and high permeability reservoirs, people pay more and more attention to the development of low permeability reservoirs. Surfactant flooding has been proved to be a very promising method to enhance the recovery of low permeability oilfields, and has become a research hotspot at home and abroad. Compared with medium and high permeability reservoirs, residual oil droplets in low permeability reservoirs exist in pores with small throat radius. Under the same cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K2208/30E21B43/16
Inventor 王辉辉李应成吴春芳吴国英
Owner CHINA PETROLEUM & CHEM CORP
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