封堵用超细碳酸钙与超细二氧化硅分散性研究

发布时间：2018-06-13 23:51

本文选题：超细碳酸钙粉体 + 超细二氧化硅粉体　；参考：《材料科学与工艺》2017年03期

【摘要】：为探讨水基钻井液用超细碳酸钙粉体和超细二氧化硅粉体在水溶液中的分散状况,利用扫描电镜对超细微粒进行初始形貌分析,讨论了超声时间、pH、搅拌速度等物理分散因素对超细碳酸钙粉体和超细二氧化硅粉体分散效果及分散稳定性的影响.同时,使用阴离子表面活性剂、阳离子表面活性剂、聚合物表面活性剂等对超细微粒进行了化学分散.研究表明:放置后的超细微粒会发生团聚,其中超细碳酸钙中径达5~6μm,超细二氧化硅中径达6~7μm;物理分散方法对超细微粒的分散效果影响不大,化学试剂分散效果明显优于物理分散;相同分散剂作用下,超细碳酸钙的分散效果优于超细二氧化硅,超细碳酸钙经过化学试剂分散处理后D_(10)可以达到120 nm,Zeta电位值达-56.3 mV;优化条件下制得的分散体系中,超细碳酸钙的沉降稳定性较好,放置24 h后沉降率在5%左右.
[Abstract]:In order to study the dispersion of ultrafine calcium carbonate powder and ultrafine silica powder in aqueous solution for water-based drilling fluid, the initial morphology of ultrafine particles was analyzed by scanning electron microscope (SEM). The effects of physical dispersion factors such as ultrasonic time pH and stirring speed on the dispersion and stability of ultrafine calcium carbonate and ultrafine silica powder were discussed. At the same time, the ultrafine particles were chemically dispersed by anionic surfactant, cationic surfactant and polymer surfactant. The results showed that the superfine particles would be agglomerated, in which the median diameter of superfine calcium carbonate was 5 渭 m, and the diameter of ultrafine silica was 6 渭 m, and the physical dispersion method had little effect on the dispersion of ultrafine particles. The dispersing effect of chemical reagent is obviously better than that of physical dispersion, and the dispersion effect of superfine calcium carbonate is better than that of ultrafine silica under the same dispersant. The value of Zeta potential of ultrafine calcium carbonate reached to -56.3 MV after dispersing with chemical reagent, and the sedimentation stability of ultrafine calcium carbonate was better in the dispersion system prepared under optimized conditions, and the sedimentation rate was about 5% after 24 hours of storage.
【作者单位】： "油气藏地质及开发工程"国家重点实验室(西南石油大学);
【基金】：国家“十三五”科技重大专项资助项目(2016ZX05022001-002)
【分类号】：TE254.4

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