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Silicone rubber coated high-temperature slow-expansion water-absorbing particle and preparation method thereof

A technology of water-absorbing particles and silicone rubber, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems of fast swelling of water-absorbing particles and slow water-absorbing swelling

Active Publication Date: 2020-07-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current shortcoming that water-absorbing particles expand too fast at high temperatures, the purpose of the present invention is to provide a particle plugging agent that can slowly absorb water and expand at a temperature as high as 130°C

Method used

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  • Silicone rubber coated high-temperature slow-expansion water-absorbing particle and preparation method thereof
  • Silicone rubber coated high-temperature slow-expansion water-absorbing particle and preparation method thereof
  • Silicone rubber coated high-temperature slow-expansion water-absorbing particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 12g of acrylamide, 4g of 2-acrylamido-2-methylpropanesulfonate, and 1g of N-vinylpyrrolidone into 68g of clear water and stir evenly, then add 0.05g of azobisisobutylamidine hydrochloride, 0.04 gN,N-methylenebisacrylamide, after it is fully dissolved, add 10g nano-montmorillonite and 5g rubber powder, stir again and put it in a 60°C oven for 5h to form a gel block, then granulate the gel block, Crushed into particles with a diameter of 1-1.5 mm to obtain the matrix water-absorbing particles of this embodiment.

[0027] 86g of hydroxyl-terminated polydimethylsiloxane and 8g of fumed silica, 5.5g of tetraethyl orthosilicate and 0.5g of stannous isooctanoate were fully mixed to form component A1 and component B1, and then component B1 Add to component A1 and stir evenly to obtain the silicone rubber coating agent of this embodiment.

[0028] 80 g of matrix water-absorbing particles and 20 g of silicone rubber coating agent were thoroughly mixed, and then spread and dr...

Embodiment 2

[0030] The gel block prepared in Example 1 was granulated and crushed into particles with a diameter of 2-3 mm to obtain the matrix water-absorbing particles of this embodiment.

[0031] 80g of hydroxyl-terminated polydimethylsiloxane and 13g of hydrophobic nano-silica, 6.4g of methyltrimethoxysilane and 0.6g of dibutyltin diacetate were fully mixed to form component A2 and component B2, and then the components Part B2 was added to component A2 and stirred evenly to obtain the silicone rubber coating agent of this embodiment.

[0032] 85g of matrix water-absorbing particles and 15g of silicone rubber coating agent were thoroughly mixed, and then spread and dried at room temperature to obtain the slow-swelling water-absorbing particles of this embodiment.

Embodiment 3

[0034] Add 10g of acrylamide, 3g of 2-acrylamido-2-methylpropanesulfonate, and 1g of N,N-diethylacrylamide into 68g of clear water and stir evenly, then add 0.04g of ammonium persulfate, 0.04g of N,N - Methylenebisacrylamide, after it is fully dissolved, add 10g of nano-kaolin and 8g of hectorite, stir again evenly and put it in a 60°C oven for 5 hours to form a gel block, granulate and crush the gel block into a diameter of 1 -2mm particles, to obtain the matrix water-absorbent particles of this embodiment.

[0035] 78g of hydroxyl-terminated polydimethylsiloxane and 15g of precipitated silica, 6.2g of methyltriacetoxysilane and 0.8g of dibutyltin dilaurate are fully mixed to form component A3 and component B3, and then Add component B2 to component A2 and stir evenly to obtain the silicone rubber coating agent of this embodiment.

[0036] 70 g of matrix water-absorbing particles and 30 g of silicone rubber film coating agent were thoroughly mixed, and then spread and dried ...

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Abstract

The invention discloses a silicone rubber coated high-temperature slow-expansion water-absorbing particle and a preparation method thereof. The slow-expansion water-absorbing particle consists of a conventional temperature-resistant and salt-resistant matrix water-absorbing particle and a coating layer formed by a coating agent disclosed by the invention, wherein the coating agent is composed of silicone rubber base rubber, a vulcanizing agent, a reinforcing agent and a catalyst, the silicone rubber base rubber is at least one of hydroxyl-terminated polydimethylsiloxane and alkoxy-terminated polydimethylsiloxane, the vulcanizing agent is at least one of tetraethoxysilane, methyltriacetoxysilane and the like, the reinforcing agent is at least one of nanometer calcium carbonate, fumed silicaand the like, and the catalyst is at least one of dibutyltin dilaurate, dibutyltin diacetate and the like. According to the invention, the upper limit of the temperature of an existing slow-expansionwater-absorbing particle is obviously improved, and slow expansion can be conducted at a temperature as high as 130 DEG C; and meanwhile, a coating method of the invention is environmentally friendly, does not need organic solvents and high-temperature heating, and is free of adverse effects on the environment and the properties of the water-absorbing particle.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a silicon rubber film-coated high-temperature slow-swelling water-absorbing particle and a preparation method thereof. Background technique [0002] In the process of oilfield development, high water cut in oil wells has always been one of the most prominent production problems, and profile control and water shutoff are the preferred measures for oil stabilization and water control in major oilfields. Water-absorbing particles are widely used in profile control and water plugging operations because of their characteristics such as controllable gelation performance, adjustable size, temperature and salt resistance, and simple injection process. However, while the water-absorbing particles show outstanding advantages in water control, their shortcomings are gradually exposed: the water-absorbing particles expand rapidly when exposed to water, and the expanded particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K7/26C08K5/5415C08K5/5419C08K3/36C08F220/56C08F220/58C08F226/10C08F222/38C09K8/512C09K8/516
CPCC08F220/56C08K3/36C08K5/5415C08K5/5419C08K7/26C08K2201/011C09K8/5086C09K8/512C09K8/516C08L83/04
Inventor 孙琳辛军蒲万芬韩琪刘锐
Owner SOUTHWEST PETROLEUM UNIV
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