Temperature-resistant and salt-resistant viscoelastic surfactant, and preparation method and application thereof

A surfactant, temperature and salt resistance technology, applied in the field of surfactants and their preparation, can solve the problems of poor temperature resistance, insufficient fresh water resources, poor salt resistance, etc., to achieve reduced utilization and solve fresh water resources Insufficient, good effect of salt tolerance

Inactive Publication Date: 2020-04-21
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems in the prior art, the present invention provides a temperature-resistant and salt-resistant viscoelastic surfactant and its preparation method and application. The temperature-resistant and salt-resistant viscoelastic surfactant has both cationic groups and anionic groups. It can weaken the impact of counter ions on the hydrophilic head group area, reduce the utilization of fresh water resources, and effectively solve the problems of poor temperature resistance, poor salt resistance, insufficient fresh water resources and reservoir damage.

Method used

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  • Temperature-resistant and salt-resistant viscoelastic surfactant, and preparation method and application thereof
  • Temperature-resistant and salt-resistant viscoelastic surfactant, and preparation method and application thereof
  • Temperature-resistant and salt-resistant viscoelastic surfactant, and preparation method and application thereof

Examples

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Embodiment 1

[0045] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:

[0046](1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and methanol at a volume ratio of 2:2, then add sodium hydroxide, and heat to 50°C for 7 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;

[0047] (2) Add erucamide propyl dimethylamine and intermediate one obtained in step (1) into 20 wt% ethanol solution, heat to 70° C. for 15 h to obtain intermediate two; erucamide propyl dimethylamine and The intermediate-molar ratio is 2:1;

[0048] (3) Dissolve the intermediate two obtained in step (2) in the mixed solvent two formed by mixing ethyl acetate and ethanol at a volume ratio of 9:2 at a temperature of 40°C, recrystallize at a temperature of 0°C, and finally Evaporate and dry at 70°C and 200r / min to obtain a heat-resistant ...

Embodiment 2

[0050] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:

[0051] (1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and methanol at a volume ratio of 2:3, then add sodium hydroxide, and heat to 50°C for 8 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;

[0052] (2) Add oleic amidopropyl dimethylamine and intermediate one obtained in step (1) into 20 wt% ethanol solution, heat to 80° C. for 16 hours to obtain intermediate two; oleic amidopropyl dimethylamine and Intermediate-molar ratio is 2.5:1;

[0053] (3) Intermediate 2 obtained in step (2) was dissolved in a mixed solvent 2 formed by mixing ethyl acetate and ethanol at a volume ratio of 10:2 at a temperature of 45°C, and then recrystallized at a temperature of 2°C, and finally Evaporate and dry at 80°C and 300r / min to obtain a heat...

Embodiment 3

[0055] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:

[0056] (1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and ethanol at a volume ratio of 2:5, then add sodium hydroxide, and heat to 50°C for 9 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;

[0057] (2) Add stearic acid amidopropyl dimethylamine and intermediate one obtained in step (1) into a 30wt% ethanol solution, heat to 90° C. for 17 hours to obtain intermediate two; stearic acid amidopropyl dimethyl The molar ratio of amine to intermediate is 2.5:1;

[0058] (3) Dissolve the intermediate 2 obtained in step (2) in a mixed solvent 2 formed by mixing ethyl acetate and ethanol at a volume ratio of 10:2 at a temperature of 50° C., recrystallize at a temperature of 3° C., and finally Evaporate and dry at 90°C and 400r / min to...

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Abstract

The invention provides a temperature-resistant and salt-resistant viscoelastic surfactant, and a preparation method and an application thereof. The specific structural formula of the temperature-resistant and salt-resistant viscoelastic surfactant is shown, the preparation method of the temperature-resistant and salt-resistant viscoelastic surfactant, and the application of the temperature-resistant and salt-resistant viscoelastic surfactant in a foam fracturing fluid are provided. The temperature-resistant and salt-resistant viscoelastic surfactant disclosed by the invention has both a cationic group and an anionic group, can weaken the influence of counter ions on the area of a hydrophilic head group, reduces the utilization of freshwater resources, and effectively solves the problems ofpoor temperature resistance, poor salt resistance, insufficient fresh water resources, reservoir damage and the like.

Description

technical field [0001] The invention belongs to the technical field of surfactants and their preparation, and in particular relates to a temperature-resistant and salt-resistant viscoelastic surfactant and its preparation method and application. Background technique [0002] With the development and depletion of conventional oil and gas resources, a large number of low-permeability or ultra-low-permeability unconventional oil and gas resources have attracted more and more attention from oil companies. In order to realize the economical and efficient development of such oil and gas resources, hydraulic fracturing has become an extremely important a link. Conventional water-based fracturing systems are mostly guar gum systems or polyacrylamide polymer systems, and the jelly systems formed under the action of crosslinking agents have good temperature and shear resistance. However, due to the large molecular weight of its thickener molecules, residues are easily formed in the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/38C07C233/36C07C231/12C09K8/68C09K8/86C09K8/70
CPCC07C233/38C07C233/36C07C231/12C07C227/18C09K8/68C09K8/86C09K8/703C09K8/602C09K2208/30C07C229/60
Inventor 毛金成张文龙杨小江林冲毛金桦
Owner SOUTHWEST PETROLEUM UNIV
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