石油钻采工艺2017，Vol.39Issue(1)：33-36,41,5.DOI:10.13639/j.odpt.2017.01.006
考虑泥页岩黏弹性的钻井液密度计算方法
Calculation method of drilling fluid density based on viscoelastic characteristics of shale
摘要
Abstract
Due to the intrusion of foreign fluid, mud shale presents obvious rheological effect, so borehole collapse tends to happen easily. In order to investigate how the borehole stability in mud shale is affected by viscoelastic mechanical behavior which is caused by fluids in the well, a viscoelastic creep constitutive model was developed to show the mechanical mechanisms and evolution laws of bore-hole rheological instability and deterioration. Then, balance equation and geometric equation were derived according the force on the surrounding rocks of borehole. Combined with the physical equation and boundary conditions, the drilling fluid density equation based on viscoelastic characteristics of shale was established. And finally, density charts of drilling fluids in mud shale with different shrinkage rates over the time were plotted based on actual drilling data. It is indicated that the lower the borehole shrinkage rate is, the higher the drilling fluid density shall be. As the well depth and drilling time increase, the density of drilling fluid shall be increased.关键词
泥页岩/黏弹性/井壁稳定/钻井液密度/计算方法Key words
mud shale/viscoelasticity/borehole stability/density of drilling fluid/calculation method分类
能源科技引用本文复制引用
屈展,王萍,吴学升,崔莹,张燕娜..考虑泥页岩黏弹性的钻井液密度计算方法[J].石油钻采工艺,2017,39(1):33-36,41,5.基金项目
国家自然科学基金资助项目"力学与化学耦合下泥页岩井壁蠕变损伤失稳研究"(编号:51174162) （编号:51174162）
国家自然科学基金资助项目"基于构型力学理论的井壁损伤失稳研究"(编号:51674200). （编号:51674200）
