迂曲裂缝内支撑剂运移数值模拟
Numerical simulation of proppant transport in tortuous fractures
胡晓东 1张鹏天 1周福建 1李昕桐 1白亚超 1陈超1
作者信息
- 1. 油气资源与工程全国重点实验室,北京 102249;中国石油大学(北京)非常规油气科学技术研究院,北京 102249
- 折叠
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.
Abstract
After hydraulic fracturing,numerous tortuous fractures can be generated and formed in the reservoir,and the mi-gration and distribution behavior of proppants in these tortuous fractures is not clear.In this study,in coupling with a simula-tion software of granular materials,a dense particle flow model was proposed to simulate the effects of tortuosity angle,prop-pant size,injection rate,carrying fluid density and proppant density on the migration of proppants and sand plugging in tortu-ous 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 densi-ty 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Key words
tortuous fractures/proppant transport/sand plugging predictions/numerical simulation引用本文复制引用
基金项目
国家自然科学基金联合基金(U23B2084)
出版年
2024
国家科技期刊平台
NSTL
万方数据