Evaluation of Mechanical behaviour for Resources Development of Methane Hydrate-Supported Sand in Deep Seabed

深海海底甲烷水合物支撑砂资源开发力学行为评价

基本信息

批准号：
17360226
负责人：
HYODO Masayuki
金额：
$ 9.47万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360226/
关键词：
Methane Hydrate Deep Seabed Sedimentary Deposits Resources Development Mechanical Behaviour Constitutive Model Ground Deformation Model Methane Gas 生産過程減圧法せん断変形体積変化構成モデル

项目摘要

The possible existence of a vast amount of methane hydrate around islands has attracted attention in Japan. At the same time, several production methods have then considered to extract the gas from the hydrate zone. Although it is known that the hydrates pose significant obstacles to drilling and production operations, them is at present only limited knowledge on the mechanical behavior of hydrate-rich zones, which is necessary to understand the stability around the site. For this purpose, a low-temperature high-pressure triaxial test equipment was developed to reproduce the temperature and pressure condition of the seabed where methane hydrate exists.The, methane hydrate was produced in the sand specimen set in the triaxial cell to measure its shear strength. Moreover, methane hydrate formation was replicated and methane hydrate was dissociated under different conditions of temperature and pressure in order to understand the resulting deformation behavior of the ground.On the basis of experimental results, an elastoplastic constitutive model for methane hydrate-bearing sand was developed based on subloading surface model. The bonding effect due to the cementation by methane hydrate was introduced into the model The bonding force was correlated with the pressure and temperature according to the experimental results. The simulation performed on the triaxial behaviour of methane hydrate-supported sand under various pressure and temperature condition showed good agreement with the experimental results.

岛屿周围可能存在大量甲烷水合物引起了日本的关注。与此同时，随后考虑了几种生产方法来从水合物区域提取天然气。尽管众所周知，水合物对钻井和生产作业构成重大障碍，但目前对富含水合物区域的机械行为的了解还很有限，而这对于了解该地点周围的稳定性是必要的。为此，开发了低温高压三轴试验设备，再现甲烷水合物存在的海底温度和压力状况。在三轴单元中设置的砂样中产生甲烷水合物，并测量其剪切力。力量。此外，还复制了甲烷水合物的形成过程，并在不同的温度和压力条件下解离甲烷水合物，以了解由此产生的地面变形行为。在实验结果的基础上，建立了含甲烷水合物砂的弹塑性本构模型基于子加载表面模型。模型中引入了甲烷水合物胶结引起的粘结效应，根据实验结果，将粘结力与压力和温度相关联。对不同压力和温度条件下甲烷水合物支撑砂体的三轴行为进行的模拟与实验结果吻合良好。