报告人：甘泉
时 间：12月24日下午3：00
地 点：采矿楼207会议室
报告题目：Thermal-Hydraulic-Mechanical Coupling in Unconventional Reservoir Stimulation
报告人简介：
甘泉博士毕业于美国宾州州立大学，师从美国工程院院士、宾夕法尼亚州立大学Derek Elsworth 教授，现任职于英国阿伯丁大学地球科学学院，担任Petrophysics & Formation Evaluation Program director。长期从事流固热耦合数值模拟的研究工作，用以改善应力环境下裂隙储层流体流动效果，将2D和3D离散孔裂隙结构模型嵌入到耦合模型Tough-FLAC3D中，成功地运用于油藏储层、页岩气、地热等的开采过程模拟，实现了超临界气体压裂、地热裂缝渗透率演化与衍生地震的精确描述。在JGR、JPSE，Geothermics、IJRMMS等国际著名期刊上发表50余篇高水平学术论文，特别是裂隙演化条件下的力学和流体动力学成果在国际上处于领先水平。主持并参与了英国、欧盟、中国政府、企业赞助的地热、碳酸油藏开发、煤矿安全断层滑动、数字岩心多尺度等多项课题，取得了丰硕的应用成果。
报告简介：
We present a model coupling stress and fluid flow in a discontinuous fractured mass represented as a continuum by coupling the continuum simulator Tough-FLAC3D with cell-by-cell discontinuum laws for deformation and flow. Both equivalent medium crack stiffness and permeability tensor approaches are employed to characterize pre-existing discrete fractures. The advantage of this approach is that it allows the creation of fracture networks within the reservoir without any dependence on fracture geometry or gridding. An induced thermal unloading effect is apparent under cold injection that yields a larger aperture and permeability than during conditions of isothermal injection. a stimulation then heat production optimization strategy is presented for prototypical EGS geothermal reservoirs by comparing conventional stimulation-then-production scenarios against revised stimulation schedules. The enhanced connectivity that develops between the injection zone and the production zone significantly enhances the heat sweep efficiency, while simultaneously increasing the fluid flux rate at the production well. Experiment observations suggest that fluid state controls interfacial properties and thereby governs fluid invasion into the matrix and the following breakdown process. The negligible interfacial tension in supercritical fluids allow easy invasion into the matrix, while the subcritical fluid with larger interfacial tension requires a higher pressure to invade and cause subsequent breakdown of the borehole.
