Preparation method and application of pH-sensitive water-absorption expansion resin

A water-absorbing swelling and sensitivity technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of plugging micro-cracks, environmental inconsistencies, etc., and achieve the goal of reducing water absorption, reducing water absorption, and strong water retention capacity Effect

Inactive Publication Date: 2021-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the pH-sensitive hydrogel involved in the Chinese invention patent application with the publication number CN101074286A, and the superabsorbent resin involved in the publication numb

Method used

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  • Preparation method and application of pH-sensitive water-absorption expansion resin

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Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the pH-sensitive water-swellable resin of this embodiment comprises the following steps:

[0024] Measure 40g of deionized water into a three-necked beaker, turn on the magnetic stirrer, blow in nitrogen, and then add 8.34g of acrylamide, 1.67g of acrylic acid, 4.16g of methacryloyloxyethyltrimethylammonium chloride, 0.14g of N ,N-Methylenebisacrylamide, stir for 10min, then slowly add 1mol / L acetic acid solution for neutralization, make the whole system neutral or weakly acidic, add 0.13g of potassium persulfate, stop feeding nitrogen, and continue stirring After 20 minutes, put it into an 80°C constant temperature water bath to continue the reaction, and control the reaction time to 6 hours. The product was taken out and repeatedly soaked in pure water for 24 hours to remove impurities, and the deionized water was changed every 8 hours. Finally put it into a 99°C oven for drying and pulverization.

Embodiment 2

[0026] The preparation method of the pH-sensitive water-swellable resin of this embodiment comprises the following steps:

[0027] Measure 40g of deionized water into a three-necked beaker, turn on the magnetic stirrer, blow in nitrogen, and then add 6.25g of acrylamide, 1.25g of acrylic acid, 6.25g of methacryloyloxyethyltrimethylammonium chloride, 0.14g of N , N-methylenebisacrylamide, stirred for 10min. Then slowly add 1mol / L acetic acid solution for neutralization, so that the whole system is neutral or weakly acidic, add 0.13g of potassium persulfate, stop feeding nitrogen, continue stirring for 20min, and put it in a constant temperature water bath at 80°C to continue the reaction. The control reaction time is 6h. The product was taken out and repeatedly soaked in pure water for 24 hours to remove impurities, and the deionized water was changed every 8 hours. Finally put it into a 99°C oven for drying and pulverization.

Embodiment 3

[0029] The preparation method of the pH-sensitive water-swellable resin of this embodiment comprises the following steps:

[0030] Measure 40g of deionized water into a three-necked beaker, turn on the magnetic stirrer, blow in nitrogen, and then add 4.16g of acrylamide, 0.83g of acrylic acid, 8.34g of methacryloyloxyethyltrimethylammonium chloride, 0.13g of N , N-methylenebisacrylamide, stirred for 10min. Then slowly add 1mol / L acetic acid solution for neutralization, make the whole system neutral or weakly acidic, add 0.13g of potassium persulfate, stop feeding nitrogen, continue stirring for 20min, put it into a constant temperature water bath at 80°C for continuous reaction, and control The reaction time is 6h. The product was taken out and repeatedly soaked in pure water for 24 hours to remove impurities, and the deionized water was changed every 8 hours. Finally, put it into a 99°C oven for drying and crushing.

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Abstract

The invention belongs to the field of preparation of absorption expansion resin, and particularly relates to a preparation method and application of pH-sensitive water-absorption expansion resin. Thepreparation method of the pH-sensitive water-absorption expansion resin comprises the following steps: carrying out copolymerization reaction on acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium salt and a cross-linking agent N,N-methylene bisacrylamide in a solvent under the condition that the pH value is 5-7, wherein the molar ratio of acrylamide to methacryloyloxyethyl trimethylammonium salt is (1-2):(1-2), the mass of acrylic acid accounts for 18-22% of the mass of acrylamide, and the mass of the cross-linking agent accounts for 1-6% of the total mass of acrylamide, acrylic acid and methacryloyloxyethyl trimethyl ammonium salt monomers. According to the preparation method of the pH-sensitive water-absorption expansion resin, the comonomer and the cross-linking agent are selected, so that the resin has pH sensitivity and relatively strong water retention capacity, and can tolerate a complex formation pressure environment.

Description

technical field [0001] The invention belongs to the field of preparation of absorbent swelling resin, and in particular relates to a preparation method and application of pH sensitive water absorbent swelling resin. Background technique [0002] With the deepening of oil and gas exploitation, harsher geological conditions and turbulent pressure layers in complex formations will cause damage to the sealed annular cement sheath, resulting in a large number of microcracks in the rigid cement sheath. Over time, the connectivity gradually extends, eventually destroying the integrity and sealing properties of the cement sheath. [0003] After the cement sheath is destroyed, the conventional remedial measures mainly include: replenishing cement, squeezing cement or secondary cementing. However, this type of remedial measures also faces difficulties such as the difficulty in determining the injection location, the adjustment of the waiting time, and the need to shut down the well a...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F220/06C08F222/38C08F2/10C09K8/46
CPCC08F220/56C08F220/34C08F2/10C09K8/426C09K8/46C08F220/06C08F222/385
Inventor 杨军虎赵林王海娟孙中伟仝继昌冯冲曾虹钢肖俊杰
Owner CHINA PETROLEUM & CHEM CORP
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