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Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof

A clean fracturing fluid, medium and high temperature technology, applied in the field of fracturing fluid, can solve the problems of limited popularization and application, poor temperature resistance of clean fracturing fluid system, etc.

Inactive Publication Date: 2010-07-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The currently used clean fracturing fluid system has poor temperature resistance, generally at 60-80°C, and is not suitable for use in deep wells with relatively high formation temperatures, thus limiting the popularization and application of this technology

Method used

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  • Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof
  • Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof
  • Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First, Gemini cationic surfactant ethylene bis(octadecyl dimethyl ammonium chloride), amphoteric surfactant cetyl dimethyl amine oxide, cosolvent methanol and water are mixed evenly to obtain a uniform transparent liquid. Then, in the transparent liquid, the aqueous solution of electrolyte salt potassium chloride and counterion sodium salicylate is mixed under stirring condition to obtain, said its mass percent is 2% of Gemini cationic surfactant, 1% of amphoteric surfactant, 1% electrolyte salt, 0.05% counter ion, 0.5% co-solvent, and the balance is water. The medium-high temperature clean fracturing fluid obtained in this example was heated at 25°C for 170s -1 The viscosity under shear is greater than 180mPa·s, at 90°C, 110°C, 130°C, 170S -1 Shearing for 60 minutes, its viscosity is 127mPa s, 86mPa s, 36mPa s respectively. It has good temperature resistance, shear resistance and sand carrying performance, which fully meets the sand carrying requirements of oil and ga...

Embodiment 2

[0046] First, Gemini cationic surfactant propylene bis(octadecyl dimethyl ammonium chloride), amphoteric surfactant octadecyl dimethyl amine oxide, co-solvent isopropanol and water are evenly mixed to obtain a uniform transparent liquid , then add the aqueous solution of electrolyte salt sodium chloride and counterion sodium lauryl sulfate to the transparent liquid under stirring conditions and mix uniformly to obtain, said its mass percentage is Gemini cationic surfactant 5%, amphoteric surfactant 1%, electrolyte salt 3%, counter ion 0.1%, co-solvent 0.8%, and the balance is water. The medium-high temperature clean fracturing fluid obtained in this example is at 90°C, 110°C, 130°C, 170S -1 After shearing for 60 minutes, the viscosities are 181mPa·s, 120mPa·s, and 67mPa·s respectively.

Embodiment 3

[0048] First, the Gemini cationic surfactant ethylene bis(octadecyl dihydroxyethyl ammonium chloride), the amphoteric surfactant tallow dimethyl amine oxide, the cosolvent glycerin and water are evenly mixed to obtain a uniform transparent liquid , then add electrolyte salt ammonium chloride and counter ion sodium dodecylbenzenesulfonate aqueous solution to the transparent liquid under stirring conditions and mix uniformly to obtain, said its mass percentage is Gemini cationic surfactant 3%, amphoteric surface Activator 2%, electrolyte salt 2%, counter ion 0.08%, cosolvent 0.1%, and the balance is water. The medium-high temperature clean fracturing fluid obtained in this example is at 90°C, 110°C, 130°C, 170S -1 After shearing for 60 minutes, the viscosities are 178mPa·s, 120mPa·s, and 70mPa·s respectively.

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Abstract

The invention provides medium-temperature and high-temperature clean fracturing fluid used under high formation temperature and a preparation method thereof. The clean fracturing fluid contains Gemini cation surfactant, amphoteric surfactant, electrolyte salt, counter-ion salt, cosolvent and water. The clean fracturing fluid of the invention is used for oil and gas field fracturing and mainly comprises 2-5 percent of surfactant, 1-4 percent of amphoteric surfactant, 1-4 percent of electrolyte, 0.05-0.15 percent of counter ion and 0.1-1.5 percent of cosolvent by weight percent. Viscoelastic fluid is formed under agitation. The invention has the advantages that the viscoelasticity of the system is high, the friction resistance is low and good sand suspending performance is kept within 90-130 DEG C.

Description

technical field [0001] The invention relates to a fracturing fluid for fracturing stimulation measures in the development process of oil and gas fields, in particular to a medium-high temperature clean fracturing fluid which can be used under relatively high formation temperature conditions and a preparation method thereof. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs, and fracturing fluid is an important part of fracturing technology. The most commonly used fracturing fluids at home and abroad are mainly water-based fracturing fluids with natural vegetable gum, cellulose and synthetic polymers as thickeners, which have been widely used in various oil fields and have achieved good production stimulation effects. However, the disadvantage of the water-based polymer fracturing fluid system is that the fracturing fluid does not completely break the gel, and the residue...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 沈一丁马少云王磊赖小娟李刚辉
Owner SHAANXI UNIV OF SCI & TECH
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