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Association polymer and preparation method thereof, and applications in high-temperature-resistant fracturing fluids

A technology of hydrophobic association and synthesis method, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high cost, limited application, large amount of viscoelastic surfactant, etc., and achieve excellent viscoelasticity, high Temperature resistance, small dosage effect

Active Publication Date: 2020-01-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vegetable gum and its derivatives have better thickening effects, but they contain more water-insoluble plant fibers, and a large amount of residue after gel breaking will block the fracturing fracture, directly affecting the fracturing effect; the performance of the chemically modified vegetable gum is improved. Improvement, but the cost is difficult to control when the price of vegetable gum is unstable
The VES fracturing fluid system does not contain water-insoluble substances, is easy to break the gel and has no residue, and has the advantages of simple system preparation, no other chemical additives, and simple construction. However, the system uses a large amount of viscoelastic surfactant and high cost, which limits Its application in oil field

Method used

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  • Association polymer and preparation method thereof, and applications in high-temperature-resistant fracturing fluids
  • Association polymer and preparation method thereof, and applications in high-temperature-resistant fracturing fluids
  • Association polymer and preparation method thereof, and applications in high-temperature-resistant fracturing fluids

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Dissolve 0.5mol β-cyclodextrin and 0.5mol maleic anhydride in N,N-dimethylformamide and react at 80°C for 10 hours to obtain monomer MAH-β-CD;

[0032] (2) In an ice bath, add 0.1mol N,N-didodecylamine and 6N sodium hydroxide (50ml) into dichloromethane and pass through dry nitrogen, and use a constant pressure funnel to dissolve methacryloyl chloride (0.104mol) Slowly added to the mixed solution of dichloromethane, stirred for 2 hours, separated, the organic phase was washed with distilled water until neutral, dried and rotary evaporated to obtain the monomer DiC 12 AM;

[0033] (3) The mole fraction is 5% MAH-β-CD and the mole fraction is 6% DiC 12 Add AM and 70% acrylamide by mole fraction, 8% acrylic acid and 10% 2-acrylamido-2-methylpropanesulfonic acid by mole fraction to deionized water to form an aqueous solution with a monomer concentration of 20%, and pass nitrogen gas After half an hour, the temperature was raised to 45°C and an initiator was added, the...

Embodiment 2

[0036] Add a mole fraction of 0.1% MAH-β-CD and a mole fraction of 0.1% DiC 12 AM (synthesized in Example 1) and mole fraction is 99.5% acrylamide, and 0.15% acrylic acid and mole fraction are that 0.2% 2-acrylamido-2-methylpropanesulfonic acid joins deionized water and is made into monomer concentration 15% aqueous solution, nitrogen gas for half an hour, the temperature was raised to 45°C and an initiator was added, and the hydrophobic polymer was obtained after polymerization for 6 hours.

[0037] The fracturing fluids prepared with 0.6% hydrophobic association polymer and 0.4% hydrophobic association polymer were treated at 100℃ and 170s respectively -1 rheology such as Figure 4 and Figure 5 shown. After shearing for 2 hours, the viscosities remained above 150 mPa·s and 100 mPa·s respectively, which can meet the requirements of on-site construction; the static suspended sand test showed that there was no obvious settlement for 2 hours, and the viscosity of the gel bre...

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Abstract

The invention discloses an association polymer used for an oil field fracturing fluid and capable of improving recovery ratio, and a preparation method thereof. The preparation method comprises: (1) dissolving 0.05 mol of beta-cyclodextrin and 0.05 mol of maleic anhydride into N,N-dimethylformamide, and reacting at 80 DEG C for 10 h to obtain a monomer MAH-beta-CD; (2) adding 0.1 mol of N,N-didodecylamine and 6N sodium hydroxide (50ml) into dichloromethane in an ice bath, introducing dry nitrogen, slowly adding methacryloyl chloride (0.104 mol) into the mixed solution of dichloromethane by using a constant-pressure funnel, and stirring for 2 h to obtain a monomer DiC12AM; and (3) adding the monomers MAH-beta-CD and DiC12AM, acrylamide, acrylic acid and 2-acrylamido-2-methylpropanesulfonicacid into deionized water, introducing nitrogen for half an hour, heating to 45-60 DEG C, adding an initiator, and carrying out a polymerization reaction for 6-8 h to obtain the hydrophobic association polymer. According to the invention, the prepared fracturing fluid prepared from the polymer has good thickening capacity and good temperature resistance, and has good application prospects in oil field fracturing fluids and recovery ratio improvement.

Description

technical field [0001] The invention relates to an oilfield fracturing fluid and a hydrophobic association polymer thickener for enhancing oil recovery, a preparation method thereof and a high-temperature-resistant fracturing fluid. Background technique [0002] Since the 1940s, the birth, development and continuous application of fracturing fluid have formed a discipline involving multiple systems. At present, the fracturing fluid thickeners used at home and abroad are mainly vegetable gums and their derivatives, viscoelastic surfactants (VES) and synthetic polymers. Vegetable gum and its derivatives have good thickening effect, but they contain more water-insoluble plant fibers, and a large amount of residue after gel breaking will block the fracturing fracture, directly affecting the fracturing effect; the performance of the chemically modified vegetable gum is improved. Improvement, but it is difficult to control the cost under the condition of unstable vegetable gum pr...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C08F220/54C09K8/68
CPCC08F251/00C09K8/68C09K8/882C09K8/90C09K2208/26C08F220/06C08F220/56C08F220/54
Inventor 毛金成徐涛林冲毛金桦杨小江
Owner SOUTHWEST PETROLEUM UNIV
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