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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 restricting the development and application of VES fracturing fluid and reducing the viscosity of VES fracturing fluid, and achieve good stability and universality , The effect of expanding the fracturing formation range and improving the temperature resistance and viscosity enhancement performance

Active Publication Date: 2019-05-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • High-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof
  • High-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof
  • High-salt-resistant viscoelastic surfactant cleaning fracturing fluid and preparation method thereof

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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 ...

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Abstract

The invention discloses a high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and a preparation method thereof. The fracturing fluid contains a cationic surface active agent, and thestructural formula of the cationic surface active agent is shown as the following formula. In the formula, R<1>' is selected from saturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, unsaturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, and a compound as shown in the following formula, wherein R<1> is selected from saturated alkyls with a carbon number n meeting a relationship of 16<=n<=24, and unsaturated alkyls with a carbon number n meeting a relationship of 16<=n<=24; and R<2> is selected from saturated alkyls with a carbon number C meetinga relationship of 3<=C<=7, unsaturated alkyls with a carbon number C meeting a relationship of 3<=C<=7, and short-chain alkylbenzene (C<=5). The cationic surfactant has good resistance to inorganic salts, and the principle is that the R<2> substituent groups block mutual proximity between polar head groups of the cationic surface active agent under a high-mineralization-degree condition, and thenprecipitation of the cationic surface active agent is avoided, so that the micelle continues keeping a dense three-dimensional network structure, and tackifying performance is improved.

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

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Application Information

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Patent Type & Authority Applications(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)
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