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Silicon-containing supercritical CO2 dry fracturing fluid thickening agent and preparation method thereof

A technology for dry fracturing fluid and thickener, which is applied in the field of thickener, preparation of thickener, and thickener for silicon-containing supercritical CO2 dry fracturing fluid, and can solve problems such as being unsuitable for industrial application. , to achieve good stability

Pending Publication Date: 2021-12-07
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Irani and others have studied some siloxane polymers that can greatly increase the viscosity of carbon dioxide. Among them, dimethylcyclosiloxane has the best effect, which can increase the viscosity of carbon dioxide by 90 times, but a large amount of organic co-solvent must be added, so it does not Not suitable for industrial applications

Method used

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  • Silicon-containing supercritical CO2 dry fracturing fluid thickening agent and preparation method thereof
  • Silicon-containing supercritical CO2 dry fracturing fluid thickening agent and preparation method thereof
  • Silicon-containing supercritical CO2 dry fracturing fluid thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 18g methylcyclosiloxane (DMC), 9g vinyltriethoxysilane (WD-20), 9g sodium dodecylbenzenesulfonate (SDBS) (emulsifying dispersant) to the four-necked flask successively. 3g of dodecylbenzenesulfonic acid (SDBA) (catalyst) and 60g of deionized water, stirred for 30min at a speed of 500r / min, then heated up to 80°C, started timing, and adjusted the speed to 250r / min, and reacted for 3h After that, the temperature was naturally lowered to 50°C. Adjust the pH to 7-8 with a mass fraction of 10% sodium hydroxide solution. Then adjust the rotation speed to 150r / min, then cool down to normal temperature naturally, and discharge as seed emulsion (PDMS). Add 5.5g polyvinyl alcohol (PVA) and 35g deionized water into the three-necked flask, heat up and dissolve. After cooling down to 50°C, add 5.4g octylphenol polyoxyethylene ether (OP-10), 30g vinyl acetate (VAc), 3.6g sodium dodecyl sulfate (SDS) and 60g deionized water, and adjust the speed to 500r / min, stirred for 30min,...

Embodiment 2

[0032]Add 18g methylcyclosiloxane (DMC), 9g vinyltriethoxysilane (WD-20), 9g sodium dodecylbenzene sulfonate (SDBS), 3g dodecyl Benzenesulfonic acid (SDBA) and 45g deionized water were stirred for 30min at a rotation speed of 500r / min, then the temperature was raised to 80°C, timing was started, and the rotation speed was adjusted to 250r / min, and the temperature was naturally lowered to 50°C after 3 hours of reaction. Adjust the pH to 7-8 with a mass fraction of 10% sodium hydroxide solution. Then adjust the rotating speed to be 150r / min, then naturally cool down to normal temperature, and discharge as seed emulsion. Add 4.5g polyvinyl alcohol (PVA) and 30g deionized water into the three-necked flask, and heat up to dissolve. After cooling down to 50°C, add 4g octylphenol polyoxyethylene ether (OP-10), 30g vinyl acetate (VAc), 2.7g sodium dodecyl sulfate (SDS) and 55g deionized water, and adjust the speed to 500r / min, stirred for 30 min, and transferred to the dropping fun...

Embodiment 3

[0034] Add 19g methylcyclosiloxane (DMC), 10g vinyltriethoxysilane (WD-20), 9g sodium dodecylbenzenesulfonate (SDBS), 3.5g dodecane to the four-necked flask in sequence Base benzenesulfonic acid (SDBA) and 45g deionized water, stir for 30min at a speed of 500r / min, then raise the temperature to 80°C, start timing, and adjust the speed to 250r / min, react for 3h, then naturally cool down to 50°C . Adjust the pH to 7-8 with a mass fraction of 10% sodium hydroxide solution. Then adjust the rotating speed to be 150r / min, then naturally cool down to normal temperature, and discharge as seed emulsion. Add 2.5g polyvinyl alcohol (PVA) and 20g deionized water into the three-necked flask, heat up and dissolve. After cooling down to 50°C, add 4g octylphenol polyoxyethylene ether (OP-10), 35g vinyl acetate (VAc), 2.5g sodium dodecyl sulfate (SDS) and 25g deionized water, and adjust the speed to 500r / min, stirred for 30 min, and transferred to the dropping funnel for use. Add 0.5 g of...

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Abstract

The invention relates to a silicon-containing supercritical CO2 dry fracturing fluid thickening agent. The thickening agent is prepared from 18g to 27g of methylcyclosiloxane, 9g to 13g of vinyltriethoxysilane, 30g to 35g of vinyl acetate, 9g to 13g of sodium dodecyl benzene sulfonate, 3g to 4g of dodecylbenzene sulfonic acid, 2.5 g to 5.5 g of polyvinyl alcohol, 4g to 5.4 g of octylphenol polyoxyethylene ether, 2.5 g to 3.6 g of lauryl sodium sulfate, 3g to 3.1 g of ammonium persulfate and 89g to 155g of deionized water. The product provided by the invention is suitable for industrial application and has strong thickening ability. The invention also discloses a preparation method of the silicon-containing supercritical CO2 dry fracturing fluid thickening agent at the same time.

Description

technical field [0001] The invention relates to a thickener, more specifically a silicon-containing supercritical CO 2 The dry fracturing fluid thickener (dimethylcyclosiloxane-vinyl acetate binary copolymer) belongs to the field of oil field chemistry, and the invention also relates to a preparation method of the thickener. Background technique [0002] Supercritical CO 2 The fracturing fluid has little damage to the formation and has no fracturing fluid residue. During the fracturing process, it will be heated and expanded to vaporize and finally flow back to the wellbore. At the same time, it can replenish energy for low-pressure reservoirs to achieve long-term stable production development. But CO 2 As a fracturing fluid, it also has its inevitable disadvantages. CO 2 The low viscosity leads to large fracturing fluid fluid loss, poor sand-carrying capacity, and high frictional resistance, which limits the scale of fracturing operations. Therefore, how to increase th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F283/12C08F218/08
CPCC09K8/68C09K8/882C09K8/885C08F283/124C08F218/08Y02P20/54
Inventor 付美龙胡佳妮王杰
Owner YANGTZE UNIVERSITY
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