页岩气储层压裂液滞留机理与模拟研究

项目名称： 页岩气储层压裂液滞留机理与模拟研究

项目编号： No.51504266

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 王飞

作者单位： 中国石油大学（北京）

项目金额： 20万元

中文摘要： 页岩气储层在水力压裂过程中需要泵注大量的水，现场统计超过60%的压裂液滞留在地下不能够返排，这种现象可能影响页岩气井的压后产能。然而，目前缺乏直接可视的实验数据证明滞留液的分布范围、前缘运移动态以及这种现象是如何影响页岩气产能的。. 本项目详细设计了室内实验来重现侵入压裂液在水力裂缝及其周围复杂基质孔隙间的运移和滞留过程。物理模拟了压裂液泵注、返排和关井等几个重要施工步骤。辅以实验获得的侵入液饱和度、毛细管力、相对渗透率、应力敏感等参数，建立了流动模拟数值模型来重现侵入压裂液的运移和滞留过程。项目研究结果将有助于深入理解清水压裂液在页岩气储层中的运移和滞留控制机理，同时提高对页岩气采收机理的进一步认识。

中文关键词： 页岩气；分段压裂；油藏数值模拟；水平井；页岩气水平井

英文摘要： A general observation from the completion of shale gas wells is that a large fraction of the injected water remains in the formation after flowback, and that the fluid loss from any single well can exceed 60% of the original injected volume. This may affect the post-fracturing productivity of the well. However, there is lack of direct experimental and visual evidence of the extent of fluid retention, evolution of the resulting invaded fluid front, and how they relate to potential productivity hindrance.. In this study, laboratory experiments have been carefully designed to represent the migration and retention of the invaded fluid in the neighborhood of hydraulic fractures. Laboratory experiments are carried out on several shale samples in order to mimic the fluid injection, flowback and shut-in periods of the well.Then, aided by laboratory invaded fluid saturation, relative-permeability, capillary pressure data and their dependency to stress in a shale gas reservoir, the flow-simulation model are able to reproduce the suspected fluid migration and retention behavior. Results from this investigation are expected to provide fundamental insight to improve the understanding of the physical mechanisms that control fluid transport and subsequent gas recovery.

英文关键词： Shale gas;Multi-stage fracturing;Reservoir simulation;Horizontal well;Shale gas horizontal well