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Ampholytic surfactant fracturing fluid and preparation method thereof

A surfactant and fracturing fluid technology, applied in the field of fracturing fluid, can solve the problems of reduced fracturing effect, clogging, incomplete gel breaking of fracturing fluid, etc., achieve good flowback performance, control fracture height, increase fracture long effect

Active Publication Date: 2012-07-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 after the gel breaks will block the pores and fractures of the rock, reducing the conductivity of the fracture propped zone and the permeability of the oil and gas layer, thereby greatly reducing the fracturing effect. effect, resulting in the inability to achieve the best stimulation effect of fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Under stirring conditions, add 5g of octadecyl betaine, 1g of sodium dodecyl diphenyl ether disulfonate, 0.5g of methanol, 5g of formic acid, and 0.5% potassium chloride into 84g of distilled water, and stir for 5-10min. After obtaining a milky white stable suspension, add 4g of sodium chloride and stir for 1-2 minutes to obtain a transparent viscoelastic fluid.

[0011] The performance of the amphoteric surfactant fracturing fluid was tested by the EX2000 rheometer of American TA Company. -1 The viscosity remained at 40mPa·s after shearing for 1h.

[0012] The amphoteric surfactant fracturing fluid described in this embodiment includes 5% octadecyl betaine, 1% sodium dodecyl diphenyl ether disulfonate, 0.5% methanol, and 5% formic acid by mass percentage , sodium chloride 4%, clay stabilizer 0.5%, and the rest is water. The amphoteric surfactant fracturing fluid obtained in this example can be used for fracturing at a formation temperature of 60°C.

Embodiment 2

[0014] Under stirring conditions, 5g of octadecyldimethyl betaine, 1g of sodium fatty acid methyl ester sulfonate, 0.5g of methanol, and 0.5g of potassium chloride were added to 89g of distilled water, and stirred for 5-10min to obtain a milky white stable suspension To the turbid liquid, add 4g of sodium chloride and stir for 1-2min to obtain a transparent viscoelastic fluid.

[0015] The performance of the amphoteric surfactant fracturing fluid was tested by the EX2000 rheometer of American TA Company. -1 The viscosity remained at about 36mPa·s after shearing for 1h.

[0016] The amphoteric surfactant fracturing fluid described in this embodiment includes 5% octadecyl dimethyl betaine, 1% sodium fatty acid methyl ester sulfonate, 0.5% methanol, and 4% sodium chloride by mass percentage , clay stabilizer 0.5%, the rest is water. The amphoteric surfactant fracturing fluid obtained in this example can be used for fracturing at a formation temperature of 60°C.

Embodiment 3

[0018] Under stirring conditions, 3g oleic acid amidopropyl betaine, 0.5g sodium dodecyl diphenyl ether disulfonate, 0.3g ethanol, 5g formic acid, 0.5g potassium chloride were added to 84.7g distilled water respectively, and stirred for 5 -10min to obtain a milky white stable suspension, then add 4g of sodium chloride and stir for 1-2min to obtain a transparent viscoelastic fluid.

[0019] The performance of the amphoteric surfactant fracturing fluid was tested by the EX2000 rheometer of American TA Company. -1 The viscosity remained at about 55mPa·s after shearing for 1h.

[0020] The amphoteric surfactant fracturing fluid described in this embodiment comprises oleic amidopropyl betaine 5%, sodium dodecyl diphenyl ether disulfonate 0.5%, methanol 0.3%, formic acid 5% by mass percentage %, sodium chloride 4%, clay stabilizer 0.5%, and the rest is water. The amphoteric surfactant fracturing fluid obtained in this example can be used for fracturing at a formation temperature o...

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Abstract

The invention relates to ampholytic surfactant fracturing fluid and a preparation method thereof. The ampholytic surfactant fracturing fluid comprises the following components in percentage by mass: 3 to 5 percent of ampholytic surfactant, 0.5 to 1 percent of anionic surfactant, 2 to 4 percent of inorganic salt, 0.3 to 0.5 percent of alcohol with low molecular weight, 0 to 5 percent of pH value regulator, 0.5 percent of clay stabilizer and the balance of water. The preparation method comprises the following steps of: adding the ampholytic surfactant, the anionic surfactant, the alcohol with low molecular weight, the pH value regulator, and the clay stabilizer into water, stirring for 5 to 10 minutes to obtain uniform and stable suspension, adding the inorganic salt, and stirring for 1 to 2 minutes to obtain fluid with high visco-elasticity. The ampholytic surfactant fracturing fluid is used for fracturing of an oil and gas field of which the formation temperature is 60 to 80 DEG C, residues are avoided after gel breaking, and a stratum is not damaged.

Description

technical field [0001] The invention relates to a fracturing fluid for hydraulic fracturing stimulation measures in the process of oil and gas field exploitation, in particular to an amphoteric surfactant fracturing fluid and a preparation method thereof. Background technique [0002] As the main stimulation measure of low permeability oil and gas reservoirs, fracturing has been developed rapidly and widely used, 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 after the gel breaks will block the pores and fractures of the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 薛小佳杨华赵振峰赵文王方一刘新印吕海燕吴江李转红曹宗熊吕宝强
Owner PETROCHINA CO LTD
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