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Core-shell structure oil-absorbing resin microspheres suitable for oil well cement, preparation method and application
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An oil-absorbing resin and core-shell structure technology, which is applied to the preparation of core-shell structure oil-absorbing resin microspheres and the field of core-shell structure oil-absorbing resin microspheres, can solve the problems of resin structure damage, poor dispersion performance, etc. The effect of stable production
Active Publication Date: 2017-04-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, the cement slurry is in a water-based environment, and the dispersion performance of conventional polyacrylate oil-absorbing resins in water is poor; and the pH value of the cementing slurry is as high as 12 to 13. It is easy to hydrolyze under high temperature and alkaline conditions, and the resin structure is destroyed
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Embodiment 1
[0032] Equipped with stirrer, reflux condenser, N 2 1. Add 200 g of distilled water and 1 g of modified fumed silica into a four-necked flask with a dropping funnel, stir until the modified fumed silica is completely dispersed, and raise the temperature to 85° C. Stir and mix 6.25g methyl methacrylate, 6.25g lauryl methacrylate, 0.063g divinylbenzene, 0.375g benzoyl peroxide and 7g ethyl acetate until the benzoyl peroxide is completely dissolved. Add the oil phase solution dropwise to water at 1000r / min, stir at high speed for 10min, then react at 300r / min for 2h, filter after the reaction, wash with 80°C distilled water three times, and finally dry at 50°C for 24h.
Embodiment 2
[0034] Equipped with stirrer, reflux condenser, N 21. Add 200 g of distilled water and 2 g of gelatin into a four-necked flask with a dropping funnel, stir until the gelatin is completely dissolved, and heat up to 85° C. Stir and mix 6.25g methyl methacrylate, 6.25g lauryl methacrylate, 0.063g divinylbenzene, 0.375g benzoyl peroxide and 7g ethyl acetate until the benzoyl peroxide is completely dissolved. Add the oil phase solution dropwise to water at 1000r / min, stir at high speed for 10min, then react at 300r / min for 2h, filter after the reaction, wash with 80°C distilled water three times, and finally dry at 50°C for 24h.
Embodiment 3
[0036] Equipped with stirrer, reflux condenser, N 2 1. Add 200 g of distilled water and 1.3 g of modified fumed silica into a four-necked flask with a dropping funnel, stir until the modified fumed silica is completely dispersed, and heat up to 80° C. Stir and mix 5.5g methyl methacrylate, 7g lauryl methacrylate, 0.06g divinylbenzene, 0.2g benzoyl peroxide and 12.5g ethyl acetate until the benzoyl peroxide is completely dissolved, The oil phase solution was added dropwise to water at a speed of 1000r / min, stirred at a high speed for 10min, then reacted at a speed of 300r / min for 3h, filtered after the reaction, washed with 80°C distilled water for 3 times, and finally dried at 50°C for 24h.
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Abstract
The invention discloses a core-shell structure oil-absorbing resin microsphere suitable for oil well cement and its preparation method and application. The preparation method uses modified nanoparticles as a dispersant and a shell material, and uses hard components in acrylate compounds as a single The body and soft component monomers are binary monomers, and a cross-linking agent, an initiator and a porogen are added to prepare an oil-absorbing resin microsphere with a core-shell structure by suspension polymerization. The synthesis process of the invention is stable, and the oil phase droplets can be kept stable and not coalesced during the suspension polymerization process; the synthesized oil-absorbing resin microspheres have uniform particle size and good sphericity, and have good dispersion in the alkaline high-temperature environment of oil well cement slurry It can keep the oil-absorbing resin microsphere structure and oil-absorbing performance stable, and the oil-absorbing capacity will not be affected. When the downhole cement sheath of the oil well is damaged and micro-cracks are generated, the oil-absorbing resin microspheres can absorb oil and expand when encountering the oil flow through the micro-cracks, forming a physical seal at the place where the cement sheath is damaged.
Description
technical field [0001] The present invention relates to a method for preparing oil-absorbing resin microspheres with core-shell structure, and also relates to the oil-absorbing resin microspheres with core-shell structure prepared by the preparation method, and the oil-absorbing resin microspheres with core-shell structure used as oil-absorbing and swelling components in oil well cement application. The invention belongs to the fields of oil and gas well cementing and oil field chemistry. Background technique [0002] The main function of cementing stone is to seal off the formation, prevent fluids from different formations from crossing each other, and ensure the safe and stable production of oil and gas wells. The cementing quality of oil and gas wells requires the service life of the cement sheath to be greater than 30 years, and the cementing quality of underground gas storage requires the service life of the cement sheath to be greater than 80 years. However, after th...
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