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Design Methodology of Artificial Crack -Like Reservoir for HDR Geothermal Energy Extraction ( T-Project )

用于 HDR 地热能提取的人工裂缝类储层的设计方法（T-Project）

基本信息

批准号：
58065002
负责人：
ABE Hiroyuki
金额：
$ 211.2万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Specially Promoted Research
财政年份：
1983
资助国家：
日本
起止时间：
1983 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-58065002/
关键词：
Geothermal Energy HDR Hydraulic Fracturing Design of Subsurface Crack Subsurface Crack Measurement Acoustic Emission Fractrue Toughness 岩石環境強度地下熱交換面破壊靭性

项目摘要

The purpose of the project is for the development of the design methodology of artificial subsurface cracks for the extraction of geothermal energy from hot dry rocks. The basis of the approach is rock fracture mechanics. The project has three research areas; [T] evaluation of rock mechanical properties, [M] monitoring and mapping of subsurface cracks and [S] simulation of subsurface cracks. It consists of three phases, i.e., Phase I, II and III. In Phase I, the validation of rock fracture mechanics was made through hydraulic fracturings of rock cubic specimens with a variety of sizes from 0.5 m up to 10 m. In Phase II, a model field was set up at Higashihachimantai. A large subsurface crack was created by massive hydraulic fracturings nearly 350 m below the ground surface and two wells were successfully connected through the artificial crack. This subsurface circulation system is the first system in the world constructed as designed. In Phase III, effects of geothermal subsurface conditions, such as temperature and confining pressure, on rock fracture were investigated, including mechanochemical interactions berween water and rocks. Through these three phases, the design methodology for creating subsurface reservoir cracks was finally established. The main results of each research area can be listed as in the following. [T]: The process and the mechanism of crack growth in rocks and the size effect of rock fracture were clarified and new methods were developed for fracture toughness tests of rocks. [M]: Hardware and software of downhole AE measurement systems were developed. New methodologies utilizing the systems for monitoring of subsurface cracks were established. [S]: Simulators were developed for analyzing the crack behavior under a variety of geothermal subsurface conditions and an in-situ tectonic stress measurement method was successfully established for three-dimensional stress fields.

该项目的目的是开发用于从干热岩石中提取地热能的人工地下裂缝的设计方法。该方法的基础是岩石断裂力学。该项目分为三个研究领域； [T] 岩石力学特性评估，[M] 地下裂纹监测与绘图，[S] 地下裂纹模拟。它由三个阶段组成，即第一阶段、第二阶段和第三阶段。在第一阶段，通过对0.5 m至10 m各种尺寸的岩石立方体试样进行水力压裂来验证岩石断裂力学。第二期工程在东八幡平建立了示范场。在地表以下近350 m处进行大规模水力压裂，形成大面积地下裂缝，并通过人工裂缝成功连通两口井。该地下循环系统是世界上第一个按设计建造的系统。在第三阶段，研究了地热地下条件（例如温度和围压）对岩石破裂的影响，包括水和岩石之间的机械化学相互作用。通过这三个阶段，最终建立了地下储层裂缝的设计方法。各研究领域的主要成果如下。 [T]：阐明了岩石裂纹扩展的过程和机制以及岩石断裂的尺寸效应，发展了岩石断裂韧性测试的新方法。 [M]：井下声发射测量系统硬件和软件开发。建立了利用该系统监测地下裂纹的新方法。 [S]：开发了用于分析各种地热地下条件下裂缝行为的模拟器，并成功建立了三维应力场的原位构造应力测量方法。