Anionic clean fracturing fluid

A clean fracturing fluid, anionic technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems affecting the viscoelasticity of fracturing fluid, high toxicity and irritation, harsh preparation conditions, etc., and achieve adsorption Small, low formation damage, simple configuration effect

Active Publication Date: 2015-02-25
江西富诚生态环境科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with anionic surfactants, cations are more likely to be adsorbed on negatively charged rock surfaces, which often leads to a decrease in the content of surfactants in the system, which affects the viscoelasticity of fracturing fluids and leads to higher costs of fracturing fluids
In addition, cationic surfactants are more toxic and irritating than anionic surfactants, and are more difficult to biodegrade
However, the production process of zwitterionic surfactants is often more complex and cumbersome than that of anionic surfactants, especially compared to fatty acid salt anionic surfactants, resulting in an increase in the cost of fracturing fluids
[0004] However, due to the harsh preparation conditions and weak viscoelasticity of anionic viscoelastic fluids, the popularization and application of anionic fracturing fluids has been hindered.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Anionic clean fracturing fluid includes the following ingredients: sodium stearate 2%, potassium erucate 2%, N 1 ,N 1 ,N 1 ,N 2 ,N 2 ,N 2 - Hexamethylpropyldiammonium bromide 1.5%, fumed silica 0.5%, water 93.5%. Its viscosity-temperature performance can be seen in figure 1 , as the temperature increases, the viscosity of the fracturing fluid decreases continuously, but at 120 degrees Celsius, 170s -1 The shear viscosity can still be maintained at about 50mPa.s, fully meeting the needs of oil and gas field fracturing operations.

Embodiment 2

[0025] Anionic clean fracturing fluid includes the following ingredients: Potassium behenate 4%, N 1 ,N 1 ,N 2 ,N 2 -Tetramethyl-N 1 ,N 2 - Dibenzylhexyl diammonium bromide 2.5%, N 1 ,N 1 ,N 1 ,N 2 ,N 2 ,N 2 - 0.5% of hexamethylpropyl diammonium bromide, 0.8% of barium sulfate, and the balance is water. Its viscosity-temperature performance can be seen in figure 1 , 170s at room temperature -1 Under the shear viscosity is about 490mPa.s, when the temperature rises to 120 degrees Celsius, 170s -1 The shear viscosity remains above 50mPa.s.

Embodiment 3

[0027] Anionic clean fracturing fluid includes the following ingredients: peanut sodium 2.5%, potassium stearate 2.5%, potassium behenate 0.5%, N 1 ,N 1 ,N 2 ,N 2 -Tetramethyl-N 1 ,N 2 - Diethylhexyl diammonium chloride 2%, N 1 ,N 1 ,N 1 ,N 2 ,N 2 ,N 2 - Hexamethylethyldiammonium bromide, kaolin 0.3%, balance water. Its viscosity-temperature performance can be seen in figure 1 , 170s at the start -1 Under the shear viscosity is about 530mPa.s, when the temperature rises to 120 degrees Celsius 170s -1 Under the shear viscosity is still maintained at about 50mPa.s.

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Abstract

The invention relates to an anionic clean fracturing fluid applicable to oilfield fracturing yield increase operation and a preparation method thereof, belonging to the technical field of oil-gas field exploitation application. The anionic clean fracturing fluid comprises the following components in percentage by mass: 2-8% of long-carbon-chain natural fatty acid salt anionic surfactant, 0.5-6% of Bola type counter ion quaternary ammonium salt, 0.1-2% of nano stabilizer and the balance of water. The preparation method is simple and quick. The preparation method comprises the following steps: dissolving the Bola type counter ion quaternary ammonium salt in water at room temperature by stirring, and slowly adding the fatty acid salt and nano stabilizer to obtain the transparent viscous fluid. The anionic clean fracturing fluid has the advantages of low formation damage, high sand carrying capacity, no need of any gel breaker, low adsorptivity and environmental protection. The anionic clean fracturing fluid has huge potential value in oil-gas field fracturing exploitation application.

Description

technical field [0001] The invention relates to an anionic clean fracturing fluid in oil field exploitation, and belongs to the technical field of oil and gas field fracturing. Background technique [0002] In order to overcome the damage to the formation caused by the use of traditional water-soluble polymer fracturing fluids, clean fracturing fluids based on viscoelastic fluids formed by self-assembly of surfactants have attracted increasing attention. [0003] In the preparation and application of clean fracturing fluids, viscoelastic surfactants that are cheap, easy to obtain, environmentally friendly, and have strong viscosity-increasing ability have always been the goal pursued by practical production and one of the problems that are eager to be solved. Most of the currently used viscoelastic surfactants are cationic surfactants (CN10395199A, CN102643637A, CN103897684A, CN101298555A, CN101481608A) or zwitterionic surfactants (CN101812290A, CN103951593A, CN104073235A, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68
Inventor 张永民安鹏云
Owner 江西富诚生态环境科技集团有限公司
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