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Core-shell structure oil-absorptive resin microsphere suitable for oil well cement as well as preparation method and application of core-shell structure oil-absorptive resin microsphere

A technology of oil-absorbing resin and core-shell structure, which is used in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of resin structure damage and poor dispersion performance.

Active Publication Date: 2015-04-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Core-shell structure oil-absorptive resin microsphere suitable for oil well cement as well as preparation method and application of core-shell structure oil-absorptive resin microsphere
  • Core-shell structure oil-absorptive resin microsphere suitable for oil well cement as well as preparation method and application of core-shell structure oil-absorptive resin microsphere
  • Core-shell structure oil-absorptive resin microsphere suitable for oil well cement as well as preparation method and application of core-shell structure oil-absorptive resin microsphere

Examples

Experimental program
Comparison scheme
Effect test

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 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 a 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-absorptive resin microsphere suitable for oil well cement as well as a preparation method and an application of the core-shell structure oil-absorptive resin microsphere. The preparation method comprises the following steps: with modified nano particles as a dispersing agent and a shell material, a hard component monomer and a soft component monomer in an acrylic compound as binary monomers, adding a crosslinking agent, an initiator and a pore-foaming agent, and preparing the oil-absorptive resin microsphere with the core-shell structure by a suspension polymerization method. The core-shell structure oil-absorptive resin microsphere is stable in synthesis process; the stability and no coalescence of oil-phase droplets can be kept in the suspension polymerization process; the synthesized oil-absorptive resin microsphere is uniform in particle size and good in sphericity, and has good dispersity in an alkaline high-temperature environment of the oil well cement; the structure and the oil absorptiveness of the oil-absorptive resin microsphere can be kept stable; the oil absorption is not affected; and when a downhole cement ring of an oil well is damaged to generate a microcrack, the oil-absorptive resin microsphere can absorb oil to swell when running into oil flow through the micro-crack, and a physical packer is formed in the damaged part of the cement ring.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F212/36C08F222/14C08F2/44C08F2/18C08K9/06C08K3/36C08K3/22C08J3/12C08J9/28C09K3/32B01J13/14
Inventor 步玉环王春雨柳华杰郭胜来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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