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Control of Geothermal Reservoirs Consisting of Multiple Cracks

多裂缝地热储层的控制

基本信息

批准号：
05232103
负责人：
HAYASHI Kazuo
金额：
$ 84.67万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05232103/
关键词：
Geothermal Reservoir Artificial Crack Fluid Flow in a Crack Heat Transfer in a Crack Characteristic of a Crack Surface Acoustic Emission Fractal Crack Surface Crack Stiffness

项目摘要

The main objective of the present project is to clarify the mechanical response of geothermal engineered reservoirs, such as HDR/HWR reservoirs, within a rock mass with many planes of weakness. To this end, we have constructed models for the case that the reservoir consists of innumerable joints and for the case that the reservoir consists of predominant reservoir cracks. We have clarified the basic characteristics of such reservoirs. Then, we have applied them successfully to the results of massive hydraulic fracturing/stimulation conducted at the Fenton Hill HDR field and at the Yunomori HWR field. It is preferable that the basic characteristics of the models can be estimated by using the geometrical and mechanical characteristics of fracture surfaces of fractures within core samples retrieved from the depth of boreholes. Therefore, we developed new methods for estimating the hydraulic properties of fractures from the fractal characteristics of fracture surfaces based on the laborato … More ry experiments under tri-axial stress conditions. Furthermore, we conducted mini-hydraulic fracturings in a driftway at the Kamioka mine to make a man-made fracture and to characterize the fractal characteristics of the surfaces created by hydraulic fracturing to find that the fractal characteristics are different from those of surfaces of fractures made by explosion and of slicken sides which are the surfaces subjected to shear movements. We have also developed new techniques on crosshole seismic measurement, borehole radar measurement and precise AE measurement for estimating the structure of multicrack geothermal reservoirs and the in-situ stress state of surrounding rocks. We have analyzed data sets observed at geothermal fields and have estimated reservoir characteristics by using these new techniques. It was found that it is highly probable that man-made reservoir cracks are accompanied by many-small secondary cracks generally. The hydraulic and heat transfer properties have been investigated for reservoir cracks accompanied by the secondary cracks by conducting laboratory experiments, where the rock with secondary cracks is simulated by a packed cube bed. Less

本项目的主要目的是澄清地热工程油藏（如HDR/HWR油藏）在具有许多软弱面的岩体中的力学响应。为此，我们为储层由无数节理组成和储层由主要储层裂缝组成的情况建立了模型。明确了该类储层的基本特征。然后，我们成功地将其应用于Fenton Hill HDR油田和Yunomori HDR油田的大规模水力压裂/增产结果。利用从钻孔深处提取的岩心样品中裂缝裂缝面的几何和力学特征来估计模型的基本特征是可取的。因此，在三轴应力条件下的室内实验基础上，提出了利用裂缝表面分形特征估计裂缝水力特性的新方法。此外，我们在神冈矿的一个巷道中进行了小型水力压裂，制造了一条人工裂缝，并对水力压裂产生的裂缝表面的分形特征进行了表征，发现水力压裂产生的裂缝表面的分形特征不同于爆炸产生的裂缝表面和受剪切运动影响的光滑面。开发了井间地震测量、井内雷达测量和精密声发射测量等新技术，用于估算多槽地热储层结构和围岩地应力状态。我们分析了地热田观测数据集，并利用这些新技术估计了储层特征。研究发现，一般情况下，人工裂缝很可能伴随有许多小的次生裂缝。通过室内实验研究了含次生裂缝的储层裂缝的水力和传热特性，并对含次生裂缝的储层岩石进行了模拟。少