迂曲裂缝内支撑剂运移数值模拟  

Numerical simulation of proppant transport in tortuous fractures

作　　者：胡晓东 张鹏天[1,2] 周福建 李昕桐 白亚超[1,2] 陈超 HU Xiaodong;ZHANG Pengtian;ZHOU Fujian;LI Xintong;BAI Yachao;CHEN Chao(State Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《中国石油大学学报（自然科学版）》2024年第3期111-118,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金联合基金项目(U23B2084)。

摘　　要：水力压裂后,储层形成较多的迂曲裂缝,支撑剂在迂曲裂缝中的运移和铺置规律尚不明确,在稠密颗粒流模型的基础上耦合颗粒物料仿真软件,模拟迂曲角度、支撑剂尺寸、注入速率、携砂液密度和支撑剂密度对迂曲裂缝中支撑剂运移和砂堵的影响。结果表明:大多支撑剂会堆积在裂缝第一转折角处,迂曲角度的变化会显著影响支撑剂的运移和砂堵的发生,迂曲角度大,容易发生砂堵且砂堵程度严重;密度大和粒径小的支撑剂发生砂堵时会形成致密的支撑剂堆积,加剧砂堵程度;注入速率大,支撑剂在裂缝中运移距离较远,但注入速度和携砂液密度的增加,会加剧砂堵程度。After hydraulic fracturing,numerous tortuous fractures can be generated and formed in the reservoir,and the migration and distribution behavior of proppants in these tortuous fractures is not clear.In this study,in coupling with a simulation software of granular materials,a dense particle flow model was proposed to simulate the effects of tortuosity angle,proppant size,injection rate,carrying fluid density and proppant density on the migration of proppants and sand plugging in tortuous fractures.The results show that most proppants can accumulate at the location of first turning angle of the fracture.The variation in tortuosity angle can significantly affect the migration of proppants and the occurrence of sand plugging,with a higher tortuosity angle leading to more severe sand plugging.Proppants with higher density and smaller particle size tend to form dense proppant accumulation during sand plugging,exacerbating the severity of sand plugging.Higher injection rates can result in longer migration distances of proppants in the fracture,but increasing injection velocity and carrying fluid density can exacerbate the severity of sand plugging.

关 键 词：迂曲裂缝 支撑剂运移 砂堵预测 数值模拟 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]