Temperature-resistant composite cleaning fracturing fluid and preparation method thereof

A clean fracturing fluid and temperature-resistant technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to degrade, fail to meet the field application promotion, and high cost, and achieve enhanced micellar network structure intensity effect

Inactive Publication Date: 2018-07-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis process of the associative long-chain alkylacrylamide polymer provided by this invention is complicated, the cost of chemicals involved is high, and the polymer monomer is easy to remain in the formation and cannot be degraded
[0004] The use of nanomaterials to further enhance the performance of clean fracturing fluids has become one of the current research hotspots. CN107033868 A discloses a nanomaterial-enhanced clean fracturing fluid and a preparation method thereof. A new type of composite clean fracturing fluid system obtained by compounding silica can further improve the consistency and viscoelasticity of the fracturing fluid. It has been verified that nano-silica has the function of improving the performance of the fracturing fluid. However, the quaternary ammonium used in this invention Salt cationic surfactants have insufficient temperature resistance and are only suitable for medium and low temperature formation environments. In addition, the nano-silica used in this invention is ordinary hydrophilic nano-silica, which is easy to agglomerate in aqueous solution, although it can rely

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  • Temperature-resistant composite cleaning fracturing fluid and preparation method thereof
  • Temperature-resistant composite cleaning fracturing fluid and preparation method thereof
  • Temperature-resistant composite cleaning fracturing fluid and preparation method thereof

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preparation example Construction

[0030] The preparation method of the temperature-resistant composite clean fracturing fluid comprises the following steps:

[0031] (1) Disperse ordinary hydrophilic nano-silica in an organic solvent with an ultrasonic cleaner, then add acid anhydride organic matter, and stir magnetically at room temperature for 15 hours at a speed of 600-700 rpm to obtain acid anhydride-modified nano-silica. particle reaction solution.

[0032] (2) Put the anhydride-modified nanoparticle reaction solution obtained in step (1) into a high-speed centrifuge for high-speed centrifugation at a speed of 9000 rpm and a centrifugation time of 30 minutes. Collect the centrifuged product and wash it with ethanol for 3 times to remove untreated particles. After the fully reacted acid anhydride organic matter is washed with ethanol, it is vacuum-dried to remove the remaining organic solvent and ethanol, and the dried solid is ground to obtain the acid anhydride-modified nano-silica particles.

[0033] (...

Embodiment 1

[0037] A temperature-resistant composite clean fracturing fluid, its components and mass percentages are as follows:

[0038]Behenamidopropyldimethylamine 1%; Sodium Salicylate 1%; Modified Nanoparticles 1% and the balance water.

[0039] The preparation method of the temperature-resistant composite clean fracturing fluid comprises the following steps:

[0040] (1) 2g particle size is 20nm, specific surface area 240m 2 / g of ordinary hydrophilic nano-silica is dispersed in 200ml of N,N-dimethylamide using an ultrasonic cleaner, then 2g of maleic anhydride is added, and magnetically stirred at room temperature for 15 hours at a speed of 600 rpm, that is The reaction solution of maleic anhydride modified nanoparticles was obtained.

[0041] (2) Put the maleic anhydride modified nanoparticle reaction liquid obtained in step (1) into a high-speed centrifuge and carry out high-speed centrifugation, the rotating speed is 9000 rpm, and the centrifugation time is 30 minutes; the cen...

Embodiment 2

[0047] A temperature-resistant composite clean fracturing fluid, its components and mass percentages are as follows:

[0048] Stearic acid amidopropyl dimethylamine 2%; sodium p-toluenesulfonate 1.5%; modified nanoparticles 2% and the balance of water.

[0049] The preparation method of the temperature-resistant composite clean fracturing fluid comprises the following steps:

[0050] (1) 4g particle size is 25nm, specific surface area is 300m 2 / g of ordinary hydrophilic nano-silica is dispersed in 200ml of toluene with an ultrasonic cleaner, and then 4.5g of trimellitic anhydride is added, and magnetically stirred at room temperature for 15 hours at a speed of 650 rpm to obtain modified trimellitic anhydride. Nanoparticle reaction solution.

[0051] (2) Put the trimellitic anhydride modified nano-particle reaction solution obtained in step (1) into a high-speed centrifuge for high-speed centrifugation, the rotating speed is 9000 rpm, and the centrifugation time is 30 minute...

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Abstract

The invention discloses a temperature-resistant composite cleaning fracturing fluid and a preparation method thereof, wherein the temperature-resistant composite cleaning fracturing fluid comprises the following components by mass: 2-2% of a surfactant; 1-2% of a countra-ion assistant; 1-2% of nano particles and balance of water. The preparation method comprises the following steps: first esterifying ordinary hydrophilic nano silica with an acid anhydride organic substance to obtain an acid anhydride modified surface carboxylated nano particle, then preparing a nano fluid by using the modifiednano particle, sequentially adding the temperature resistant surfactant and the countra-ion assistant, uniformly mixing, standing at a constant temperature to obtain the temperature-resistant composite cleaning fracturing fluid. The temperature-resistant composite cleaning fracturing fluid has the advantages of simple preparation method and low cost, and the nano silica particles modified by theacid anhydride has a dual mechanism effect in the cleaning fracturing fluid, further strengthens the gelation of the long-chain surfactant so as to improve the viscoelasticity and temperature resistance of the clean fracturing fluid, and broadens the application of the clean fracturing fluid in complex reservoirs.

Description

technical field [0001] The invention belongs to the technical field of functional nanomaterials and oil recovery chemistry in the development of oil and gas fields, and in particular relates to a temperature-resistant composite clean fracturing fluid and a preparation method thereof. Background technique [0002] With the rapid development of the national economy, oil, as an efficient and extensive energy source, is also in increasing demand. With the continuous development of oil and gas exploration and development, the reserves of easy-to-exploit reservoirs are decreasing, so the development of low-permeability oil and gas layers is currently in the technical reserve stage. There are abundant oil and gas reserves in my country's low-permeability oil and gas reservoirs, but due to the low natural production capacity, they cannot achieve effective production by relying on their own energy. Therefore, the recovery rate must be improved by fracturing. The fracturing fluid is t...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/66C09K8/584C09K8/86
CPCC09K8/584C09K8/665C09K8/68C09K8/845C09K8/86C09K2208/10
Inventor 赵明伟戴彩丽张跃吴一宁李玉阳吴雪鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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