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Salt-tolerant Gemini cation VES (Viscoelastic Surfactant) as well as preparation method thereof and salt-tolerant clean fracturing fluid

A surfactant and cation technology, applied in the field of salt-tolerant gemini cationic viscoelastic surfactant and its preparation, salt-resistant clean fracturing fluid, can solve problems such as non-salinity resistance, and achieve good salt resistance , good viscoelasticity, strong surface activity

Inactive Publication Date: 2019-03-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of salt-resistant gemini cationic viscoelastic surfactant and its preparation method and salt-resistant clean fracturing fluid, to solve the problems existing in the application of existing viscoelastic surfactants in clean fracturing fluid The problem of resistance to mineralization

Method used

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  • Salt-tolerant Gemini cation VES (Viscoelastic Surfactant) as well as preparation method thereof and salt-tolerant clean fracturing fluid
  • Salt-tolerant Gemini cation VES (Viscoelastic Surfactant) as well as preparation method thereof and salt-tolerant clean fracturing fluid
  • Salt-tolerant Gemini cation VES (Viscoelastic Surfactant) as well as preparation method thereof and salt-tolerant clean fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The preparation method of the salt-tolerant type gemini cationic viscoelastic surfactant of the present embodiment is as follows:

[0048] Oleamide propyl dimethylamine and dibromoneopentyl glycol are dissolved in N,N-dimethylformamide (DMF) at a molar ratio of 2.1:1, and potassium iodide is added as a catalyst (potassium iodide and oleamide propyl The molar ratio of dimethylamine is 1:10), at 145°C, magnetically stirred at 300r / min, and reflux heating with a condenser tube for 24 hours; vacuumize with an oil pump, under 5 negative pressures, distill under reduced pressure at 80°C to remove DMF Solvent to obtain a viscous paste crude product; dissolve the crude product in ethyl acetate at 40°C, remove unreacted dibromoneopentyl glycol and potassium iodide catalyst by suction filtration; recrystallize the ethyl acetate solution at 3°C ​​to remove unreacted oleic acid amide Propyldimethylamine, after three recrystallizations, ethyl acetate was removed by rotary evaporatio...

Embodiment 2

[0050] The preparation method of the salt-tolerant type gemini cationic viscoelastic surfactant of the present embodiment is as follows:

[0051] Erucamide propyl dimethylamine and dibromoneopentyl glycol were dissolved in N,N-dimethylformamide (DMF) at a molar ratio of 2.1:1, and potassium carbonate was added as a catalyst (potassium carbonate and erucamide The molar ratio of propyldimethylamine is 1:13), at 135°C, the magnetic sub-stirrer is 300r / min, and the condenser tube is added to reflux and heated for 22 hours; the oil pump is used to evacuate, under 4 negative pressures, 70°C vacuum distillation, Remove the DMF solvent to obtain a viscous paste crude product; dissolve the crude product in ethyl acetate at 30°C, remove unreacted dibromoneopentyl glycol and potassium iodide catalyst by suction filtration; recrystallize the ethyl acetate solution at 0°C, remove unreacted mustard Acid amidopropyl dimethylamine, after three times of recrystallization, rotary evaporation to...

Embodiment 3

[0053] The preparation method of the salt-tolerant type gemini cationic viscoelastic surfactant of the present embodiment is as follows:

[0054] Stearic amidopropyl dimethylamine and dibromoneopentyl glycol were dissolved in N,N-dimethylformamide (DMF) at a molar ratio of 2.5:1, and sodium carbonate was added as a catalyst (potassium carbonate and stearic acid The molar ratio of acid amidopropyl dimethylamine is 1:11), at 150°C, the magnet is stirred at 300r / min, and the condenser is added to reflux and heated for 26 hours; vacuumize with an oil pump, under 6 negative pressures, reduce the pressure at 85°C Distill and remove the DMF solvent to obtain a viscous paste crude product; dissolve the crude product in ethyl acetate at 50°C, remove unreacted dibromoneopentyl glycol and potassium iodide catalyst by suction filtration; recrystallize the ethyl acetate solution at 0-5°C, Unreacted stearic acid amidopropyl dimethylamine was removed, and after three times of recrystallizati...

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Abstract

The invention discloses a salt-tolerant Gemini cation VES (Viscoelastic Surfactant) as well as a preparation method thereof and salt-tolerant clean fracturing fluid. The salt-tolerant Gemini cation VES is synthesized and obtained by taking fatty acid amide propyl dimethylamine and dibromoneopentyl glycol as raw materials, micelle can be formed by the salt-tolerant Gemini cation VES under the action of hypersalinity sea water or stratum water, so that a solution can have good viscoelasticity, the salinity tolerance of the salt-tolerant Gemini cation VES can be up to 150,000 mg / L or above, the salt-tolerant Gemini cation VES can be used for preparing seawater-based clean fracturing fluid, and meanwhile, gel breaking caused after the salt-tolerant Gemini cation VES encounters the hypersalinity stratum water can be avoided; the salt-tolerant Gemini cation VES can also be used for preparing the seawater-based clean fracturing fluid, and the tolerable maximum salinity can be up to 200,000 mg / L. The preparation method disclosed by the invention is simple, and the yield of products is increased to a large extent and is commonly up to 96 percent; in addition, reaction byproducts are less, and the influence on the properties of the products is small; during preparation of the clean fracturing fluid, the using amount of the salt-tolerant Gemini cation VES is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of surfactants for petroleum reservoirs, in particular to a salt-tolerant gemini cationic viscoelastic surfactant, a preparation method thereof, and a salt-resistant clean fracturing fluid. Background technique [0002] With the rapid development of oil and gas exploration, a large number of low-permeability or ultra-low-permeability unconventional oil and gas reservoirs have attracted more and more attention from petroleum workers. The exploitation of such reservoirs needs to undergo reservoir stimulation and transformation to achieve economical and effective development. . Among the reservoir stimulation technologies, hydraulic fracturing technology is one of the most important measures to improve the production efficiency of oil and gas fields. In the past 20 years, the clean fracturing fluid formulated with viscoelastic surfactants has played a good role in carrying sand, creating fractures, and reducin...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68
Inventor 毛金成张文龙杨小江毛金铧张恒
Owner SOUTHWEST PETROLEUM UNIV
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