硅酸盐钻井液防塌机理与应用技术  

Anti-sloughing mechanism of silicate drilling fluid and its application technology

作　　者：徐加放[1] 邱正松[1] 吕开河[1] 于连香[1] 

机构地区：[1]中国石油大学(华东)石油工程学院

出　　处：《石油勘探与开发》2007年第5期622-627,共6页Petroleum Exploration and Development

基　　金：中国石油天然气集团公司2005年重点科技攻关项目"高效低成本钻井新技术--强抑制性硅酸盐防塌机理研究"(05B2030100)

摘　　要：利用Zetasizer 3000胶体电位-粒度仪、Turbiscan红外分散稳定仪以及SHM泥页岩化学-力学耦合模拟试验装置等先进的实验仪器和研究手段,初步探索了硅酸盐钻井液防止井壁坍塌的微观作用机理。研究表明,浓度为5%的硅酸盐水溶液的粒度分布较窄、颗粒较均匀,协同使用的无机盐最佳加量为3%,且粒度分布受溶液pH值和硅酸盐模数影响较大。硅酸盐胶体溶液Zeta电位为-41.0^-31.0mV,对泥岩钻屑分散体系具有很强的稳定作用;硅酸盐与泥页岩作用可以形成致密的"隔膜",具有较理想的阻止滤液侵入和压力传递的作用。研究开发了硅酸盐钻井液配方,现场试验表明,硅酸盐钻井液流变性好,井壁稳定能力强。The microscopic anti-sloughing mechanism of silicate drilling fluid is explored by using advanced experimental apparatus and reseach approaches such as Zetasizer 3000 potential ＆ granularity meter, Turbiscan infrared dispersion steady indicator and SHM （the simulation equipment of hydra-mechanics coupling of shales）. The granularity distribution of silicate water solution of 5 percent concentration is narrower and deeply affected by the silicate module and pH, the grains are even, and the optimum amount of the cooperation inorganic salt is 3 percent. The Zeta potential of silicate colloidal solution, which can stablize the dispersion system of claystone bit cuttings, ranges from --41.0mV to --31.0mV. The reaction of silicate with shales can buildup a compact isolate membrane to block or postpone the invasion of mud filtration and the pressure transmission. One silicate drilling fluid formula is developed, and field tests demonstrate that the drilling fluid has good theology and a strong rejection capability.

关 键 词：硅酸盐 钻井液 防塌机理 粒度 ZETA电位 

分 类 号：TE256[石油与天然气工程—油气井工程]