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A viscoelastic surfactant type sand-carrying liquid and its processing technology

A surfactant and sand-carrying fluid technology, which is applied in the field of clean sand-carrying fluid, can solve the problems of formation incompatibility, fracturing fluid not resistant to shear, and low reverse flow rate, so as to reduce migration and increase sand-carrying fluid ability, the effect of stabilizing fine particles

Active Publication Date: 2022-04-22
DONGYING DONGFANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thickeners are the main additives in fracturing fluids. At present, the commonly used thickeners mainly include (1) natural plant gums: such as guar gum and its derivatives; (2) cellulose: such as carboxymethyl cellulose, hydroxyethyl cellulose, etc. (3) Synthetic polymers: such as polyacrylamide, etc.; but with the needs of development, its disadvantages are gradually exposed, such as low reverse discharge rate, poor degradation effect, incompatibility with the formation, fracturing fluid Not resistant to shearing, storage time is not long, etc.
As a result, the currently used clean sand-carrying fracturing fluid has low viscosity, poor sand-carrying performance, insufficient temperature and salt resistance, and the fracturing effect is not ideal in the actual application process. In order to obtain more oil and gas resources, people urgently need A viscoelastic surfactant sand-carrying liquid with high viscosity, excellent sand-carrying performance, temperature resistance and salt resistance, clean and pollution-free

Method used

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  • A viscoelastic surfactant type sand-carrying liquid and its processing technology
  • A viscoelastic surfactant type sand-carrying liquid and its processing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) prepare modified thickener;

[0044] A. Preparation of modifying reagent: mix hexadecyl tertiary amine with absolute ethanol, adjust the pH to 6, raise the temperature to 60°C, add epichlorohydrin dropwise, and react at constant temperature for 3 hours to obtain the modifying reagent;

[0045] B. Synthesis of modified thickener: mix xanthan gum and absolute ethanol, stir for 5 minutes, add modification reagent, heat up to 85°C, add acrylamide, acrylic acid, N,N-diallyl oleamide, emulsifier , deionized water, stirred at 600r / min for 1-2h, adjusted the pH value to 6, added ammonium sulfate and sodium bisulfite to react for 8h under nitrogen conditions, added acetone, stirred for 5min, suction filtered, and the obtained material was washed with anhydrous Wash with ethanol for 3 times, and dry at 45°C for 20 hours to obtain a modified thickener;

[0046] (2) prepare modified surfactant;

[0047] A. Synthesis solution A: Dissolve dehydroabietic acid in dichloromethane,...

Embodiment 2

[0060] (1) prepare modified thickener;

[0061] A. Preparation of modifying reagent: mix hexadecyl tertiary amine with absolute ethanol, adjust the pH to 6.5, raise the temperature to 65°C, add epichlorohydrin dropwise, and react at constant temperature for 4 hours to obtain the modifying reagent;

[0062] B. Synthesis of modified thickener: mix xanthan gum and absolute ethanol, stir for 8 minutes, add modification reagent, heat up to 90°C, add acrylamide, acrylic acid, N,N-diallyl oleamide, emulsifier , deionized water, stirred at 650r / min for 1.5h, adjusted the pH value to 6.5, added ammonium sulfate and sodium bisulfite to react for 8.5h under nitrogen, added acetone, stirred for 8min, and suction filtered. Washed with ethanol for 4 times, and dried at 50°C for 22 hours to obtain a modified thickener;

[0063] (2) prepare modified surfactant;

[0064] A. Synthesis solution A: Dissolve dehydroabietic acid in dichloromethane, raise the temperature to 60°C, add catalyst and ...

Embodiment 3

[0077] (1) prepare modified thickener;

[0078] A. Preparation of modifying reagent: mix hexadecyl tertiary amine with absolute ethanol, adjust the pH to 7, raise the temperature to 70°C, slowly add epichlorohydrin dropwise, and react at constant temperature for 5 hours to obtain the modifying reagent;

[0079] B. Synthesis of modified thickener: mix xanthan gum and absolute ethanol, stir for 10 minutes, add modification reagent, heat up to 95°C, add acrylamide, acrylic acid, N,N-diallyl oleamide, emulsifier , deionized water, stirring at 700r / min for 2h, adjusting the pH value to 7, adding ammonium sulfate and sodium bisulfite to react for 10h under nitrogen, adding acetone, stirring for 10min, suction filtration, and washing the obtained substance with absolute ethanol 5 times, and dried at 55°C for 24 hours to obtain a modified thickener;

[0080] (2) prepare modified surfactant;

[0081] A. Synthesis solution A: Dissolve dehydroabietic acid in dichloromethane, raise the ...

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Abstract

The invention discloses a viscoelastic surfactant-type sand-carrying fluid. Firstly, xanthan gum is reacted with a hydrophobic cationic bond etherification reagent, and the modified xanthan gum forms a reversible network structure through electrostatic interaction and hydrophobic association, greatly Enhanced the apparent viscosity and network structure of modified xanthan gum; then using rosin derivatives as raw materials, synthesized betaine amphoteric surfactant, and combined it with acrylamide, acrylic acid and N, N-diallyl oleamide Combined copolymerization is carried out to obtain a modified surfactant; a silane coupling agent is used to graft positively charged amino groups on the surface of porous ceramics, and then succinic anhydride is used to open the ring to convert the amino groups into negatively charged carboxyl groups. The proppant is negatively charged, and through electrostatic repulsion, the modified proppant mixture is better dispersed in the sand-carrying fluid, and the fracturing effect is greatly improved. The reaction conditions are mild, the raw materials are cheap, the synthesis route is simple, and the sand-carrying ability, salt resistance, temperature resistance and shear resistance are greatly improved.

Description

technical field [0001] The invention relates to the field of cleaning sand-carrying liquid, in particular to a viscoelastic surfactant type sand-carrying liquid. Background technique [0002] Crude oil is the lifeblood of the national economy and plays a vital role in the development of the national economy and society. With the development of industry and manufacturing, countries are increasingly dependent on oil. The remaining reserves of old oil fields are still considerable. When the total reserves remain unchanged, the enhanced oil recovery is an important measure to stabilize the output of mature oilfields. In order to obtain more oil and gas resources, people use high-pressure pumps to inject liquid with a certain viscosity into the formation at high speed. When the injection speed is greater than the absorption speed of the formation, the formation will rupture or the original small cracks will be opened to form larger cracks. In order to prevent the fracture from r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C09K8/68C09K8/80C09K8/88C09K8/90C04B35/82C08F251/00C08F220/06C08F226/02C08B37/02
CPCC09K8/685C09K8/80C09K8/602C09K8/905C09K8/887C04B35/82C04B35/46C04B35/495C04B35/6365C04B35/636C04B38/0645C04B41/84C04B41/009C04B41/4552C08F251/00C08B37/0033C09K2208/26C09K2208/30C09K2208/12C08F220/56C08F220/06C08F226/02
Inventor 张安东邢煜孙双梅杜森昌毕海涛周志全
Owner DONGYING DONGFANG CHEM IND