Viscoelastic betaine surfactant composition for oil displacement

A technology of surfactant and composition, applied in the field of viscoelastic betaine surfactant composition for oil displacement, can solve problems such as low oil displacement efficiency, achieve high interfacial activity, strong oil washing ability, and enhanced oil recovery 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 that surfactants in the prior art have low oil displacement efficiency under high temperature, medium and low permeability conditions, and a new viscoelastic betaine surfactant composition is provided. The agent has the characteristics of high oil displacement efficiency, especially suitable for Shaqi Oilfield of Jiangsu Oilfield

Method used

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  • Viscoelastic betaine surfactant composition for oil displacement
  • Viscoelastic betaine surfactant composition for oil displacement
  • Viscoelastic betaine surfactant composition for oil displacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Surfactant Preparation

[0030] (1) Erucamide sultaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 , R 4 and R 5 =C 1 )preparation

[0031] a) Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 145°C for 7 hours, turn on the vacuum pump, and remove the methanol and Excessive N,N-dimethylpropylenediamine to obtain erucic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate sodium, react at 75°C for 10 hours, and dissolve in absolute ethanol After recrystallization and purification, long carbon chain betaine surfactant is obtained; wherein, methyl erucate: N, N-dimethylpropylenediamine: the molar ratio of 3-chloro-2-hydroxypropanesulfonate sodium is 1:2 :1.5.

[0032] b) The hydroxy-substituted benzene carboxylate and the erucamide sulfobetaine surfactant prepared by the present invention are respectively dissolved in water...

Embodiment 2

[0040] 1. Surfactant Preparation

[0041] (1) palmitic acid amide sulfobetaine surfactant (R 1 =C 15 , R 2 =C 2 , R 3 =C 3 h 6 O, R 4 and R 5 =C 1 )preparation

[0042] a) Add 0.5 mole of long carbon chain hexadecanoic 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 palmitic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate to react at 70°C for 12 hours, use Long carbon chain betaine surfactant is obtained after dehydrated alcohol recrystallization purification; Wherein, methyl palmitic acid: N, N-dimethylethylenediamine: the mol ratio of 2-chloroethylsulfonate sodium is 1: 2:1.5.

[0043] b) The hydroxy-substituted benzene carboxylate and the palmitic acid amide sulfobetaine surfactant prepared by the p...

Embodiment 3

[0046] 1. Surfactant Preparation

[0047] (1) triacic acid amide sulfobetaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 =C 2 , R 4 and R 5 =C 1 )preparation

[0048] a) Add 0.5 moles of long-chain triacic acid methyl ester and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 150°C for 8 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylpropylenediamine to obtain triacyl acyl tertiary amine product, then add the required amount of sodium 2-chloroethylsulfonate, react at 85 ° C for 16 hours, after no Obtain the long carbon chain betaine surfactant after water ethanol recrystallization purification; Wherein, triacic acid methyl ester: N, N-dimethyl propanediamine: the molar ratio of 2-chloroethylsulfonate sodium is 1:2 :1.6.

[0049] b) The hydroxy-substituted benzene carboxylate and the triacic acid amide sulfobetaine surfactant prepared by the present invention are r...

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Abstract

The invention relates to viscoelastic betaine surfactant composition for oil displacement and mainly solves the problems that existing surfactants have poor oil displacement effects as oil displacingagents in high-temperature medium/low-permeability reservoirs and cause huge damage to stratums and oil wells due to contained alkali. The viscoelastic betaine surfactant composition is prepared froma betaine surfactant and an anionic surfactant in the molar ratio being (1:0.01)-(1:100); the betaine surfactant is selected from at least one of structures shown in formula (I), R1 is selected from any one of C8-C29 alkyls and alkenyls, and R2 and R3 are independently selected from any one of C1-C5 alkylenes; the anionic surfactant is selected from at least one of structures shown in formula (II). With the adoption of the technical scheme, the 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 betaine surfactant composition for oil displacement and the application of the composition as an oil displacement agent. Background technique [0002] Sinopec's high-temperature and high-salt type II and III oil reservoirs have geological reserves of 8.25×10 8 t, accounting for 65.6% of the total reserves, especially the third type of oil reservoirs with formation temperature greater than 80°C and formation water salinity greater than 30000mg / L, geological reserves account for about 42% of the total resources. How to improve oil recovery and maximize the development of remaining reserves, tertiary oil recovery technology has played a very important role in ensuring stable and high production in oil fields. Among tertiary oil recovery technologies, chemical composite flooding is still one of the methods with great development prospects, and it is the main technology and direction of my country's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/68E21B43/22E21B43/25
CPCC09K8/584C09K8/602C09K8/68C09K2208/30E21B43/16E21B43/25
Inventor 王辉辉张卫东沙鸥马俊伟
Owner CHINA PETROLEUM & CHEM CORP
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