Fracture Mechanics Approach to the Growth Process of Fracture Network for Direct Heat Heat Extraction from Magma
直接加热岩浆热提取裂缝网络生长过程的断裂力学方法
基本信息
- 批准号:13650981
- 负责人:
- 金额:$ 1.6万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In the system of direct heat extraction from magma, working fluid (water) extracts heat by flowing through fractures, which are created by thermal contraction of solidified magma. Role of fractures is two fold, i.e., fluid path and heat exchange surfaces. Thus, the characteristics of these fractures are crucial. In the present research, the process of fracture growth is studied. It is supposed that the magma chamber is significantly large compared with the heat exchange system. The following condition is adopted as the base case, i.e., depth of the system is 7km, solidus temperature 800℃ and the Young's modulus times linear expansion coefficient 4.5X10^5(Pa/℃). The stress field consists of three fields, i.e., firstly the one due to over burden pressure acting on the outer boundary of the solidified region, secondly the one induced by pressure acting on the inner boundary of the solidified region and lastly the thermal stress field. The analysis is performed based on the Fracture Mechanics. It is found that growth of the first two fractures takes place at 463℃ in the base case and is followed by sequential fracture growth. The temperature at which the growth of ninth fracture takes place, is 457℃. The difference is only 6℃ between the two temperatures. This implies that the fracture growth and formation of fracture network would be almost simultaneous and thus be out of our control. There seem to be many factors which have effects on the formation of fracture network, such as fracture toughness, radius of wellbore, elastic constants and so on. Among these factors, depth of the heat exchange system has most significant effect, regarding the fracture size. Fracture toughness is less effective.
在岩浆直接取热系统中,工作流体(水)通过流经凝固岩浆热收缩形成的裂隙来取热。骨折的作用有两个方面,即,流体路径和热交换表面。因此,这些裂缝的特征至关重要。在本研究中,裂缝扩展的过程进行了研究。据推测,岩浆房是显着的大相比,热交换系统。采用以下条件作为基本情况,即,该系统的深度为7 km,固相线温度为800℃,杨氏模量乘以线膨胀系数为4.5 × 10 ~(^5)(Pa/℃)。应力场由三个场组成,即,首先是作用在凝固区外边界上的超载压力引起的应力场,其次是作用在凝固区内边界上的压力引起的应力场,最后是热应力场。根据断裂力学进行分析。结果表明,在463℃时,裂纹先扩展,后扩展。第九条断裂的生长温度为457℃。两个温度之间的差异仅为6℃。这意味着裂缝的生长和裂缝网络的形成几乎是同时的,因此是我们无法控制的。影响裂缝网络形成的因素很多,如断裂韧性、井筒半径、弹性常数等,其中换热系统深度对裂缝大小的影响最为显著。断裂韧性不太有效。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
林 一夫: "マグマエネルギー直接抽出における破砕帯の特性に関する研究"日本地熱学会平成15年学術講演会講演要旨集. (発表予定). (2003)
Kazuo Hayashi:“直接提取岩浆能量的断裂带特征的研究”日本地热学会2003年学术会议摘要(预定演讲)。
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HAYASHI Kazuo其他文献
HAYASHI Kazuo的其他文献
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{{ truncateString('HAYASHI Kazuo', 18)}}的其他基金
A novel method for four dimensional analysis of mandibular kinematics
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The Geographical Study about the Actual Condition and the Change of Traditional Markets in Modern Rural China
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Evaluation of capillary radii in wood by the centrifugal method.
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08456089 - 财政年份:1996
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Characterization of a Geothermal Reservoir Crack Based on the Analysis of Dynamic Response of a Crack Filled with Fluid
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