学术报告

报告题目：Dynamic Modeling of Injectivity Evolution in Unconsolidated Formations

报 告 人： Arash Dahi Taleghani 教授

时    间： 2019 年 12 月 23 日（周一）下午15:00

地    点： 国家重点实验室A403学术报告厅

报告人单位：美国宾夕法尼亚州立大学

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报告内容：

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.

报告人简介，

美国宾夕法尼亚州立大学（The Pennsylvania State University）能源与矿物工程学院石油与天然气工程专业博士生导师。主要从事油藏地质力学、水力压裂、井筒完整性和钻头及钻柱力学等方面研究。他拥有谢里夫理工大学的土木工程专业学士学位及结构力学及材料专业硕士学位，以及美国得克萨斯大学奥斯汀分校（University of Texas at Austin）的博士学位。他是2014年SPE石油工程员工杰出成就大奖和2017年SPE美国北美东部地区完井优化与技术奖获得者。他曾多次担任SPE年会（SPE ATCE）评定委员会成员，目前是美国机械工程师协会（ASME）旗下期刊Journal of Energy Resources and Technology的责任副主编。近年来，他在石油工程领域的杂志和国际会议上发表论文100余篇，ESI高被引文章10余篇。

油气藏地质及开发工程国家重点实验室

红宝石官方网站hbs123科研处

石油与天然气工程学院

SPE成都分部

红宝石官方网站hbs123SPE学生分会

2019年12月20日