Viscoelastic surfactant composition for oil displacement and preparation method and application of viscoelastic surfactant composition

A technology of surfactant and composition, applied in the field of viscoelastic betaine surfactant composition and preparation field for oil displacement, can solve the problems of difficult injection, formation blockage, etc., and achieves reduced repulsion, high interfacial activity, excellent resistance The effect of temperature performance

Active Publication Date: 2019-04-26
CHINA PETROLEUM & CHEM CORP +1
View PDF15 Cites 3 Cited by
  • 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 viscoelastic surfactant composition is provided , the surfactant has the characteristics of high oil displacement efficiency under the condition of high temperature and low permeability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Viscoelastic surfactant composition for oil displacement and preparation method and application of viscoelastic surfactant composition
  • Viscoelastic surfactant composition for oil displacement and preparation method and application of viscoelastic surfactant composition
  • Viscoelastic surfactant composition for oil displacement and preparation method and application of viscoelastic surfactant composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Surfactant Preparation

[0031] (1) Erucamide sulfobetaine amphoteric surfactant (R 1 =C 21 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 3 h 6 O) Preparation

[0032] 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 te...

Embodiment 2

[0042] 1. Surfactant Preparation

[0043] (1) octadecanoic acid amide sultaine surfactant (R 1 =C 17 , R 2 =C 2 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0044] a) Add methyl octadecanoate and the required amount of amidating reagent N,N-bis(2-hydroxyethyl)ethylenediamine into the reaction kettle, react at 150°C for 8 hours, turn on the vacuum pump, and remove the excess N,N-bis(2-hydroxyethyl)ethylenediamine to obtain the nonanoic acid acyl tertiary amine product, and then heated to 150°C while passing nitrogen into a reactor equipped with a condensing device and a stirring device, and then heated for 40 After 1 minute, 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 ...

Embodiment 3

[0049] 1. Surfactant Preparation

[0050] (1) nonanoic acid amide sultaine surfactant (R 1 =C 7 , R 2 =C 3 , R 3 \R 4 =C 2 , R 5 =C 2 ) preparation

[0051] a) Add methyl nonanoate and N,N-bis(2-hydroxyethyl)propylenediamine into the reactor, react at 150°C for 8 hours, turn on the vacuum pump, and remove the excess N,N-bis(2 -Hydroxyethyl) propylenediamine, obtain nonanoic acid acyl tertiary amine product, then in the reactor that condensing device and stirrer are housed, nitrogen gas limit limit is heated to 150 ℃, adds oxirane after heating 40 minutes ( 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 to Slowly feed ethylene oxide (4 moles) and propylene oxide (2 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a viscoelastic surfactant composition for oil displacement and a preparation method and application of the viscoelastic surfactant composition. The problem of poor oil displacement effect of an existing oil displacement system under the condition of a low-permeability oil reservoir is mainly solved. According to the technical scheme of the viscoelastic surfactant composition for oil displacement and the preparation method and application of the viscoelastic surfactant composition, a viscoelastic betaine surfactant composition suitable for low permeability oil fields isadopted, and the viscoelastic betaine surfactant composition comprises a betaine surfactant and an anionic surfactant, wherein the betaine surfactant is shown in the following formula (I); the anionic surfactant is at least one of formula (II); R<1> is selected from any one of alkyl and alkenyl of C<6>-C<29>, R<2> and R<5> are selected from any one of alkylene and hydroxyl-substituted alkylene ofC<1>-C<22>, m+n is equal to 0-100, and x+y is equal to 0-100; and the molar ratio of an amphoteric surfactant to the anionic surfactant is (1 to 0.01) to(1 to 100), the problem of poor oil displacement effect of the existing oil displacement system under the condition of the low-permeability oil reservoir is better solved, and the viscoelastic surfactant composition for oil displacement can be used in oil displacement production in the oil fields.(Please see the specification for the formula).

Description

technical field [0001] The invention relates to a viscoelastic surfactant composition for oil displacement, its preparation method and application, in particular to a viscoelastic betaine surfactant composition for oil displacement in low permeability reservoirs, its preparation method and application. 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. Due to the characteristics of low permeability reservoirs such as low permeability and small porosity, the water absorption capacity of the reservoir is low, and the clay minerals in the oil layer expand with water and the water quality of the injected water is not compatible with the oil layer. The oil layer damage, water injection pressure Continuously rising, resulting in the formation o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K2208/30E21B43/16
Inventor 王辉辉沙鸥张慧
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap