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Fracturing fluid thickener and preparation method thereof

A fracturing fluid thickener and emulsifier technology, which is applied to chemical instruments and methods, drilling compositions, etc., can solve the problems of poor low temperature solubility, inability to meet real-time mixing on site, affecting the stimulation effect of fracturing, etc. , to achieve the effect of improving high temperature resistance, improving system viscosity and saving water resources

Active Publication Date: 2021-08-24
北京九恒质信能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current polymers prepared only with cationic monomers or hydrophobically associated monomers have poor low-temperature solubility, need to add metal cross-linking agents to cross-link to carry sand, and cannot meet the requirements of on-site real-time mixing. needs
Moreover, formation plugging caused by insufficient dissolution and incomplete gel breaking directly affects fracturing and subsequent stimulation effects

Method used

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  • Fracturing fluid thickener and preparation method thereof
  • Fracturing fluid thickener and preparation method thereof
  • Fracturing fluid thickener and preparation method thereof

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preparation example Construction

[0043] The invention provides a preparation method of a fracturing fluid thickener, comprising:

[0044] Add acrylamide, acrylic monomer, 2-acrylamido-2-methylpropanesulfonic acid, salt-resistant monomer and For the temperature-resistant monomer, add 80%-200% deionized water accounting for the mass of the monomer and adjust the pH to 6-8 with 30% NaOH solution, and then add an aqueous emulsifier accounting for 1-10% of the monomer mass and stir to dissolve uniform;

[0045] Add white oil containing an oily emulsifier to emulsify for 10-30 minutes under stirring, the oily emulsifier accounts for 1-8% of the monomer mass, and the white oil accounts for 70-200% of the monomer mass; after emulsification, feed Deoxygenation with high-purity nitrogen for 30-40 minutes; control the initiation temperature at 0-10°C, add a redox initiator and an azo initiator for polymerization reaction, and obtain a water-in-oil inverse emulsion after reacting for 3-8 hours;

[0046] An aqueous emul...

Embodiment 1

[0051] Put 55g of N-(2-aminoethyl)-acrylamide and 100ml of butanone into a 500mL pressure vessel, add 42.5g of ethylene oxide in batches, keep the reaction temperature below 30°C and stir the reaction for 4h, and then Add 89g of sodium chloroethylsulfonate to the container, raise the temperature to 80°C and continue to stir for 8 hours, pour the product into 500ml of ether to precipitate the crude product, and then recrystallize from a mixed solution of ethanol and ethyl acetate with a volume ratio of 4:1 to obtain The salt-resistant monomer with a purity of 98.5% has a yield of 82.5%.

[0052] In a 1L container equipped with a stirrer, thermometer, condenser and gas inlet and outlet, add 144.2g of acrylamide, 17.3g of acrylic acid, 30.2g of 2-acrylamido-2-methylpropanesulfonic acid, 6.5g of salt-resistant mono Body and 11.2g N-vinylpyrrolidone and 175.5g deionized water, stir to dissolve, then adjust the pH to 6.5 with 30% NaOH solution, then add 14.5g Tween 60 and 5.3g AEO-7...

Embodiment 2

[0054] Put 55g of N-(2-aminoethyl)-acrylamide and 100ml of butanone into a 500mL pressure vessel, add 42.5g of ethylene oxide in batches, keep the reaction temperature below 30°C and stir the reaction for 4h, and then Add 89g of sodium chloroethylsulfonate to the container, raise the temperature to 80°C and continue to stir for 8 hours, pour the product into 500ml of ether to precipitate the crude product, and then recrystallize from a mixed solution of ethanol and ethyl acetate with a volume ratio of 4:1 to obtain The salt-resistant monomer with a purity of 98.5% has a yield of 82.5%.

[0055] Add 142.1g of acrylamide, 16.5g of methacrylic acid, 32.8g of 2-acrylamido-2-methylpropanesulfonic acid, 8.4g of anti- Salt monomer A, 11.0g N-vinylpyrrolidone and 176.2g deionized water were stirred and dissolved, then the pH was adjusted to 6.5 with 30% NaOH solution, and then 14.2g Tween 80 and 5.5g NP-10 were added to dissolve evenly. Under rapid stirring, 205 g of white oil in whi...

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Abstract

This application discloses a fracturing fluid thickener and its preparation method. By introducing salt-resistant monomers for copolymerization, the polymer has the ability to withstand high salinity, and the salt resistance exceeds 100,000 salinity, which can meet The reuse of on-site fracturing fluid greatly saves water resources, and it also has the effect of complexing and chain extension under the action of high-priced metal ions such as Ca2+, Mg2+, and Fe3+, thereby increasing the viscosity of the system. The high temperature resistance of the polymer is improved by introducing a temperature-resistant functional monomer, and the temperature resistance can reach above 150°C. At the same time, an instant polymer emulsion is obtained through the inverse emulsion polymerization process, which can be quickly dissolved in water and can be dispersed within 10 seconds. Dissolution is complete, so as to meet the requirements of on-site mixing.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a fracturing fluid thickener and a preparation method thereof. Background technique [0002] At present, at home and abroad, the development of unconventional oil and gas reservoirs is becoming more and more in-depth and large-scale. Especially the development of tight oil reservoirs and shale gas is in full swing. The hydraulic fracturing technology is a mature and commonly used technical method for unconventional oil and gas stimulation. At present, the main fracturing fluids used are guar gum and its derivative vegetable gum fracturing fluid, viscoelastic surfactant fracturing fluid and synthetic fracturing fluid. Polymer fracturing fluids, mainly vegetable gum fracturing fluids, account for about 90% of the entire fracturing market. Guar gum and its derivatives have strong thickening ability, good crosslinkability, salt resistance and shear resistance, but th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/60C08F220/58C08F212/14C08F226/10C08F220/06C08F220/54C08F2/32C09K8/68C09K8/88
CPCC08F2/32C08F220/56C09K8/68C09K8/882
Inventor 徐文熙
Owner 北京九恒质信能源技术有限公司
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