钻井液与完井液2018，Vol.35Issue(1)：71-76,6.DOI:10.3969/j.issn.1001-5620.2018.01.014
温敏性膨胀微胶囊防气窜水泥浆体系
A Temperature Sensitive Expanding Microcapsule Anti-Gas-Channeling Cement Slurry
摘要
Abstract
A temperature sensitive expanding microcapsule anti-gas-channeling agent has been synthesized with acrylonitrile (AN),methylmethacrylate (MMA) and methyl acrylate (MA) as the wall material,and iso-butane as the core material.The effects of the amount of iso-butane used in the synthesis on the performance of the anti-gas-channeling were studied,and the performance of the temperature sensitive expanding microcapsule anti-gas-channeling cement slurry in controlling gas channeling was evaluated.The studies and the evaluation results showed that the temperature sensitive expanding microcapsule anti-gas-channeling agent can be obtained under the following conditions:in 100 g of deionized water add AN,MMA and MA in a ratio of 3 ∶ 0.4 ∶ 2,30％ iso-butane,1％ lauroyl peroxide (LPO,as initiator),0.1％ 1,4-butanediol dimethacrylate (BDDMA,as crosslinking agent),20％ nano silicon dioxide (as dispersant),and react these substances at 65 ℃ with the protection of nitrogen.The anti-gas-channeling agent has initial expansion temperature of 65 ℃,optimal expansion temperature of 83 ℃,and is resistant to temperature as high as 120 ℃.Rate of expansion of the anti-gas-channeling agent is 50.Stimulation of water-channeling/gas-channeling in oil well cement and test of cement slurry condensation and contraction indicated that volumetric contraction of cement slurry can be made up for with less than 2％ of the synthesized anti-gas-channeling agent,meaning that this anti-gas-channeling agent has good gas-channeling prevention ability.关键词
温敏性/微胶囊/气窜/固井/固井质量Key words
Temperature sensitivity/Microcapsule/Expandability/Gas channeling/Well cementing分类
能源科技引用本文复制引用
张兴国,于学伟,郭小阳,杨吉祥,鄢锐,李早元..温敏性膨胀微胶囊防气窜水泥浆体系[J].钻井液与完井液,2018,35(1):71-76,6.基金项目
国家自然科学基金“基于多相渗流理论的环空气窜机理及应用基础研究”(51574203). （51574203）
