Degradable methylstyrene copolymer powder and preparation method and high-temperature plugging application thereof

A technology of methyl styrene and copolymer, which is applied in the field of intelligent plugging in drilling, can solve the problems of slowness, speed up in the later stage, unsuitability for pressure plugging, and failure to meet the application requirements of leak prevention and plugging, and achieve excellent mechanical properties. Effect

Pending Publication Date: 2022-07-29
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicable temperature range of this material is 60-110 °C, which cannot meet the application requirements of leakage prevention and plugging in high-temperature formations above 150 °C; in addition, due to the relatively fast degradation rate of polylactic acid at high temperatures, the prepared material can be used at 95 °C, The degradation rate is more than 15% in 5-6 days, so it is not suitable for continuous pressure plugging in high-temperature formations above 150°C for a longer period of time
Research and development of functional materials suitable for formations above 150°C, with high temperature resistance and high strength at high temperatures to meet long-lasting pressure plugging, and at the same time have appropriate degradability (slow in the early stage and accelerated in the later stage) is still a big challenge. challenge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add the solvent isoamyl acetate, monomer N-phenylmaleimide, glycidyl methacrylate, and crosslinking agent N,N'-bis(acryloyl)cystamine into the reaction flask, stir and heat up to 75° C.; add initiator azobisisobutyronitrile, stir, slowly add monomer α-methylstyrene (AMS), and react for 4 hours. Wherein, the mass percentage of the monomers in the solvent is 15%, and the molar ratio between the monomers α-methylstyrene, N-phenylmaleimide and glycidyl methacrylate is 1 / 3 / 2, the amount of the crosslinking agent N,N'-bis(acryloyl)cystamine is 2% of the mass of the monomer, and the amount of the initiator azobisisobutyronitrile is 1% of the mass of the monomer.

[0029] After the reaction, the obtained product was washed and centrifuged with n-heptane, repeated three times, and dried in an oven at 50° C. for 24 hours to obtain a white powder product. The glass transition temperature of the analyzed product was 165°C. The powder product was immersed in oil and aged in an ove...

Embodiment 2

[0031] Same as Example 1, the difference is: the monomers are N-cyclohexylmaleimide, methyl methacrylate, the crosslinking agent is 2,2-dithiodiethanol diacrylate, and the initiator is perylene glycol diacrylate. Benzoyl oxide, the solvent is a mixture of butanone and n-heptane (butanone / n-heptane=2 / 3, volume ratio). The mass percentage content of the monomer in the solvent is 25%, and the molar ratio between the monomer α-methylstyrene, N-cyclohexylmaleimide and methyl methacrylate is 2 / 3 / 1, The amount of the crosslinking agent 2,2-dithiodiethanol diacrylate is 8% of the mass of the monomer, and the amount of the initiator benzoyl peroxide is 2% of the mass of the monomer. The temperature of the mixed solution of the monomer and the crosslinking agent in the solvent was raised to 90° C., the initiator was added, the monomer α-methylstyrene (AMS) was added, and the reaction was carried out for 6 hours.

[0032] The glass transition temperature of the obtained product was 220°...

Embodiment 3

[0034] Same as Example 1, the difference is: the monomers are N-(4-hydroxyphenyl) maleimide, butyl acrylate, the cross-linking agent is allyl disulfide and cystamine, butanone and petroleum Mixture of ethers (butanone / petroleum ether=2 / 3, volume ratio). The mass percentage of the monomer in the solvent is 15%, and the molar ratio between the monomer α-methylstyrene, N-(4-hydroxyphenyl)maleimide and butyl acrylate is 6 / 3 / 4.5, the cross-linking agent allyl disulfide (2%) and cystamine (2%) are 4% of the mass of the monomer, and the amount of the initiator azobisisobutyronitrile is 2% of the mass of the monomer.

[0035] The glass transition temperature of the obtained product was 150°C. The powder product was soaked in oil and aged in an oven at 180°C for 10 days with a mass loss of 13.5%, and aged for 30 days with a mass loss of 80%.

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PUM

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Abstract

The invention discloses degradable alpha-methylstyrene copolymer powder as well as a preparation method and high-temperature leaking stoppage application thereof. The preparation method of the degradable alpha-methylstyrene copolymer comprises the following steps: adding an N-substituted maleimide monomer, an acrylic ester monomer and a cross-linking agent into a solvent, heating, and then adding an initiator and alpha-methylstyrene to react, thereby obtaining the degradable alpha-methylstyrene copolymer, the N-substituted maleimide monomer is N-phenyl maleimide, N-cyclohexyl maleimide or N-(4-hydroxyphenyl) maleimide, and the allyl ester monomer is glycidyl methacrylate, methyl methacrylate or butyl acrylate; the cross-linking agent is a cross-linking agent containing disulfide bonds. By combining the degradation effect of an alpha-methylstyrene structure and a sulfur-sulfur bond and the high-temperature resistance of the alpha-methylstyrene and N-substituted maleimide copolymer, the functional polymer which is resistant to high temperature, excellent in mechanical property and degradable after being at a high temperature for a period of time is obtained.

Description

technical field [0001] The invention relates to a degradable α-methylstyrene copolymer powder, a preparation method and a high-temperature plugging application, and belongs to the technical field of drilling intelligent plugging. Background technique [0002] Reservoir leakage control requires efficient plugging during drilling and completion, and effective removal of plugging after drilling and completion, so as to meet the needs of reservoir protection. Blockage removal and reservoir protection can be achieved through technologies such as early shielding and temporary plugging, late acidizing and plugging removal (commonly used bridging plugging materials such as calcium carbonate particles, etc., generally use strong acid to dissolve plugging), and biological enzyme plugging removal. Most of the layer protection and plug removal technologies require external assistance to remove plugs, and the process is complex. Therefore, it is necessary to comprehensively consider the ...

Claims

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Application Information

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IPC IPC(8): C08F222/40C08F212/12C08F220/32C08F220/14C09K8/42C09K8/44C09K8/467
CPCC08F222/40C08F212/12C09K8/426C09K8/44C09K8/467C09K2208/08C08F220/325C08F220/14C08F220/1804
Inventor 幸雪松邢希金刘莲英吴怡冯桓榰王超周定照何松谷林李振波
Owner CNOOC TIANJIN BRANCH
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