學術報告
報告題目：Dynamic Modeling of Injectivity Evolution in Unconsolidated Formations
報 告 人： Arash Dahi Taleghani 教授
時 間： 2019 年 12 月 23 日（周一）下午15:00
地 點： 國家重點實驗室A403學術報告廳
報告人單位：美國賓夕法尼亞州立大學
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報告內容：
In this presentation, we look at injectivity changes of water injectors targeting unconsolidated formations as a result of erosion or channelization. In this situation, sand particles migrate from the formation matrix toward the wellbore and consequently affect the well performance and completion components like frac-packs or gravel-packs. To simulate this phenomenon, we use a model that decomposes the sand matrix into two different phases by means of volumetric fractions. The first phase consists of the immobile granular phase while the other is the fraction of grains that are detached from the matrix and carried away by the fluid. The ratio of these two phases evolves over time by means of erosion and deposition. Considering the fact that erosion is understood in its physical form as gradual destruction or diminution of the material, a model is needed to describe rock elastic and plastic properties during the mentioned destruction of solid skeleton of the rock. Hence, continuum damage mechanics is utilized in a coupled framework to model this problem. The results show how local porosity evolves over time around the wellbore by the formation of channels that enhance the flow, however, upon well shut-in, flowback induced by vertical communication or water hammer effect can bring a considerable amount of sand into the well and fills it up. A study of the effect of frac-packs which are typical completions for wells targeting poorly consolidated formations is performed to demonstrate potential damage of repetitive shut-ins on injectivity in these wells. The presented model appears as a robust tool to predict sand production for different completion systems to achieve more sustainable injection operations.
報告人簡介，
美國賓夕法尼亞州立大學（The Pennsylvania State University）能源與礦物工程學院石油與天然氣工程專業博士生導師。主要從事油藏地質力學、水力壓裂、井筒完整性和鉆頭及鉆柱力學等方面研究。他擁有謝里夫理工大學的土木工程專業學士學位及結構力學及材料專業碩士學位，以及美國得克薩斯大學奧斯汀分校（University of Texas at Austin）的博士學位。他是2014年SPE石油工程員工杰出成就大獎和2017年SPE美國北美東部地區完井優化與技術獎獲得者。他曾多次擔任SPE年會（SPE ATCE）評定委員會成員，目前是美國機械工程師協會（ASME）旗下期刊Journal of Energy Resources and Technology的責任副主編。近年來，他在石油工程領域的雜志和國際會議上發表論文100余篇，ESI高被引文章10余篇。
油氣藏地質及開發工程國家重點實驗室
西南石油大學科研處
石油與天然氣工程學院
SPE成都分部
西南石油大學SPE學生分會
2019年12月20日
