Development of a Fractured Geothermal Reservoir Simulator in terms of Mechanical and Chemical Water/Rock Interactions.

根据机械和化学水/岩石相互作用开发破裂地热储层模拟器。

• 批准号: 07555325
• 负责人: HASHIDA Toshiyuki
• 金额: $ 6.59万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555325/
• 关键词: Geothermal; Hot Dry Rock; Hot Wet Rock; Reservoir; Subsurface Fractures; Numerical Simulation; Energy; マルチクラック; 水圧破砕; 岩石熱水反応; き裂

Hot Dry Rock (HDR)/Hot Wet Rock (HWR) geothermal energy extraction systems, which attract a great deal of attention as one of new technologies to obtain energy, are designed to utilize natural and artificial subsurface fractures for the heat exchange between water and hot rock. Numerical analysis of water flow and heat transfer in fractured geothermal reservoir is strongly needed to estimate the heat mining performance of these systems.In this study, first of all, HDR/HWR geothermal reservoirs were characterized by fracture network based on fractal geometry which is getting popular to assess subsurface fractures. By using fracture network geothermal reservoir model, the mithodology to analyze water flow and heat transfer in reservoirs has been established. The changes of fracture apertures has significant influence on fluid flow, and it is important to estimate fracture behavior during water circulation. The mechanical and chemical interaction between water and rock was included into the program. Share dilation of each fracture caused by water pressure was calculated based on rock mechanics theory. Rock dissolution and precipitation experiments in high pressure and temperatures have been performed. Water/Rock interaction rate was obtained as a function of temperature and surface water velocity.Short-term water circulation test was conducted at Ogachi field, one of HDR/HWR test sites in Japan. The profile of production temperature was analyzed by the program developed in this study, and the results has shown good agreement with the actual data. Furthermore this analysis could give a stochastic estimation of long-term performance of Ogachi reservoir.

干热岩石(HDR)/热湿岩石(HWR)地热能提取系统作为一种新的能源获取技术，是利用天然和人工地下裂隙进行水和热岩之间的热交换而设计的，受到了极大的关注。裂缝性地热藏水流动与换热的数值分析是评价裂缝性地热储层热开采性能的迫切需要。本研究首先对HDR/HWR地热藏进行了基于分形几何的裂隙网络表征，并将其应用于地下裂隙的评价。利用裂隙网络地热储层模型，建立了分析储集层内水流动与换热的方法。裂缝开度的变化对流体流动有重要影响，对水循环过程中裂缝行为的判断具有重要意义。水和岩石之间的机械和化学相互作用被包括在程序中。根据岩石力学理论，计算了各裂隙在水压作用下的扩容份额。进行了高压高温条件下的岩石溶解和沉淀实验。获得了水/岩石相互作用速率随温度和地表水速度的函数关系，并在日本HDR/HWR试验场之一的Ogachi油田进行了短期水循环试验。利用本文开发的程序对生产过程中的温度分布进行了分析，结果与实际数据吻合较好。此外，这一分析还可以给出Ogachi水库长期运行的随机估计。

项目成果

K.Watanabe and H.Takahashi: "Crack Systems in Rocks(一部分担、編集:Prof.P.Meredith,UCL,London)" Gordon and Breach Science Publishers Ltd.,London.(予定),

K. Watanabe 和 H. Takahashi：“岩石中的裂纹系统（部分贡献，由伦敦大学学院 P. Meredith 教授编辑）”Gordon and Breach Science Publishers Ltd，伦敦（计划），

Z.Jing,J.Willis-Richards,K.Watanabe and T.Hashida: "The Effect of Water/Rock Interaction on the Permeability of HDR Geothermal Reservoir." Proc.of the 2nd Int.Conference on Solvothermal Reactions. 2. 169-172 (1996)

Z.Jing，J.Willis-Richards，K.Watanabe 和 T.Hashida：“水/岩石相互作用对 HDR 地热储层渗透性的影响”。

高橋秀明,渡辺公雄: "岩石破壊力学からフラクタル破壊力学へ" 材料. 45. 705-710 (1996)

Hideaki Takahashi、Kimio Watanabe：“从岩石断裂力学到分形断裂力学”材料 45. 705-710 (1996)

Z.Jing, J.Willis-Richards, K.Watanabe and T.Hashida: "The Effect of Water/Rock Interaction on the Permeability of HDR Geothermal Reservoir." Proc.of the 2nd International Conference on Solvothermal Reactions. Vol.2. 169-172 (1996)

Z.Jing、J.Willis-Richards、K.Watanabe 和 T.Hashida：“水/岩石相互作用对 HDR 地热储层渗透性的影响”。

H.Takahashi and K.Watanabe: "From Rock Fracture Mechanics to Fractal Fracture Mechanics." Journal of the Society of Materials science Japan (Japanese). Vol.45. 705-710 (1996)

H.Takahashi 和 K.Watanabe：“从岩石断裂力学到分形断裂力学”。