Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof

A surfactant and clean fracturing fluid technology, applied in the field of acidizing fracturing agents, can solve the problems of lowering the viscosity of VES fracturing fluid and restricting the development and application of VES fracturing fluid, and achieve good stability and universality , expand the range of fracturing formations, and improve the effect of temperature resistance

Active Publication Date: 2021-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF20 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the inorganic salt exceeds a certain content, it will have a certain destructive effect on the worm-like micelle structure, resulting in a significant decrease in the viscosity of the VES fracturing fluid, which limits the application of the VES fracturing fluid in high-salinity reservoirs and offshore oil fields. development and application in

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
  • A kind of high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof
  • A kind of high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof
  • A kind of high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] A high-salt-resistant viscoelastic surfactant cleaning fracturing fluid system and a preparation method thereof, comprising the following components:

[0042] In terms of mass percentage: 2.0-6.0% cationic surfactant, 2.0-10.0% inorganic salt, 84.0-96.0% water.

[0043] The cationic surfactant is an ultra-long-chain fatty amide cationic surfactant with a special substitution structure, and the structure is as follows:

[0044] Among them, R 1 'Selected from saturated alkyl groups with 16≤n≤24 carbons, unsaturated alkyl groups with 16≤n≤24 carbons, R 1 Selected from saturated alkyl groups with 16≤n≤24 carbons and unsaturated alkyl groups with 16≤n≤24 carbons, R 2 It is selected from saturated alkyl groups with 3≤C≤7 carbons, unsaturated alkyl groups with 3≤C≤7 carbon atoms, and short-chain (C≤5) alkylbenzenes.

[0045] The preparation method of the ultra-long-chain fatty amide cationic surfactant with special substitution structure is as follows:

[0046]Put 5.0-...

Embodiment 1

[0051] The preparation method of oleic acid amidopropyl butyl ammonium bromide:

[0052] Take 24.0 g of oleic amidopropyl dimethyl tertiary amine in a single-necked bottle, add 35 mL of absolute ethanol as a solvent, raise the temperature to 60 ° C, slowly add 9.0 g of bromobutane dropwise, continue the reaction for 12 h, and distill under reduced pressure to obtain a yellow viscous Thick liquid, add acetone to dissolve, then refrigerate at 0°C for 10h to precipitate a white solid, filter and dry to obtain the final product with a yield of 90-96%. Its NMR spectrum is as figure 1 Shown: 1 H NMR (300MHz,D 2 O)δ: 0.75(t,2H), 0.96~1.22(m,28H), 1.64~1.73(m,3H), 2.57~2.96(m,9H), 3.02(t,2H), 3.56(s,2H ), 5.33~5.46(m,1H), 5.51~5.62(m,1H).

[0053] 1) Add 3.0wt% oleic acid amidopropyl butyl ammonium bromide prepared in Example 1 to distilled water, stir for 60 minutes, and mix well to obtain a clean fracturing fluid system; put the clean fracturing fluid system in a rheometer In t...

Embodiment 2

[0058] The preparation method of erucamide propylhexyl ammonium bromide:

[0059] Take 27.0 g of erucamidopropyl dimethyl tertiary amine in a single-necked bottle, add 35 mL of absolute ethanol as a solvent, raise the temperature to 60 ° C, slowly add 12.0 g of bromohexane dropwise, continue the reaction for 14 hours, and distill under reduced pressure to obtain a yellow viscous Thick liquid, add acetone to dissolve, then refrigerate at 0°C for 7h to precipitate a white solid, filter and dry to obtain the final product with a yield of 88-96%. Its NMR spectrum is as figure 2 Shown: 1 H NMR (300MHz,D 2 O)δ: 0.77(t,2H), 0.94~1.23(m,32H), 1.66~1.75(m,3H), 2.57~2.94(m,9H), 3.04(t,2H), 3.61(s,2H ), 5.31~5.54(m,1H).

[0060] 1) Add 3.0 wt% of erucamide propylhexyl ammonium bromide prepared in Example 2 to distilled water, stir for 60 minutes, and mix well to obtain a clean fracturing fluid system; place the clean fracturing fluid system in a rheometer In cylinder, at 90℃, 170s ...

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
shear viscosityaaaaaaaaaa
shear viscosityaaaaaaaaaa
shear viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and a preparation method thereof. The fracturing fluid contains a cationic surfactant, and the structural formula of the cationic surfactant is: wherein, R 1 'Selected from saturated alkyl groups with 16≤n≤24 carbons, unsaturated alkyl groups with 16≤n≤24 carbons, R 1 Selected from saturated alkyl groups with 16≤n≤24 carbons and unsaturated alkyl groups with 16≤n≤24 carbons, R 2 It is selected from saturated alkyl groups with 3≤C≤7 carbons, unsaturated alkyl groups with 3≤C≤7 carbon atoms, and short-chain (C≤5) alkylbenzenes. The cationic surfactant has good resistance to inorganic salts, the principle is that R 2 The substituents prevent the polar head groups of cationic surfactants from approaching each other under the condition of high salinity, avoid the precipitation of cationic surfactants, make the micelles continue to maintain a dense three-dimensional network structure, and improve the viscosity-increasing performance.

Description

technical field [0001] The invention relates to the technical field of acidizing fracturing agents, in particular to a high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and a preparation method thereof. Background technique [0002] Low-permeability oil and gas reservoirs are widely distributed in my country and have abundant reserves. Hydraulic fracturing technology is one of the commonly used technologies for the development of low-permeability oil and gas reservoirs, and fracturing fluid is an important part of hydraulic fracturing technology. Results matter. The steps of the hydraulic fracturing technology are as follows: 1) Using the surface high-pressure pump group, inject the fracturing fluid into the well at a displacement that greatly exceeds the absorption capacity of the formation, and build up high pressure at the bottom of the well; 2) When the pressure is greater than that of the ground near the well wall When the stress and the tensile stre...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/86C09K8/60C07C233/38C07C233/36C07C231/12
Inventor 杨红斌康万利王鹏祥李欣欣朱彤宇王瞳煜张弘文周博博
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com