层间非均质含天然气水合物沉积物力学性质数值模拟研究
Numerical simulation study on mechanical properties of interlayer heterogeneous natural gas hydrate sediments
叶瑞杰 1蒋宇静 2张瑞琪 1公彬 1张博文1
作者信息
- 1. 山东科技大学 能源与矿业工程学院,山东 青岛 266590
- 2. 山东科技大学 能源与矿业工程学院,山东 青岛 266590;长崎大学 研究生院工学研究科,日本 长崎 852-8521
- 折叠
摘要
为探究含天然气水合物夹层的砂岩储层的力学性质及剪切破坏机理,采用离散元法制备含天然气水合物夹层的砂岩储层试样,进行了一系列双轴剪切试验.研究结果表明:当天然气水合物夹层的饱和度低于15%,且夹层厚度小于1/5时,砂岩储层整体强度降低;当水合物夹层的饱和度超过35%,含水合物夹层厚度超过1/2时,水合物夹层才能增强整个试样的强度.含水合物夹层的失效形式与上覆层和下伏层的失效形式不同,含水合物夹层的破坏主要归因于水合物颗粒与周围颗粒的胶结作用的破坏.
Abstract
To investigate the mechanical properties and shear failure mechanisms of sandstone reservoirs with gas hydrate interlayers,we employed the discrete element method to prepare sandstone reservoir samples containing gas hydrate interlayers and conducted a series of biaxial shear tests.The results indicate that there is a reduction in the overall strength of the sandstone reservoir when the natural gas hydrate interlayer saturation is below 15%and the interlayer thickness is less than 1/5 and that the hydrate interlayer can strengthen the entire sample when the saturation of the hydrate interlayer surpasses 35%and the interlayer thickness exceeds 1/2.The failure mode of the hydrate-bearing interlayer differs from that of the overlying and underlying layers.The failure of the hydrate-bearing interlayer is primarily attributed to the breakdown of cementation between the hydrate particles and surrounding particles.
关键词
天然气水合物/含水合物夹层/层间非均质/数值模拟/力学性质/失效模式Key words
natural gas hydrates/hydrate containing interlayer/interlayer heterogeneity/numerical simulation/me-chanical properties/failure mode引用本文复制引用
基金项目
国家自然科学基金(520095077)
山东省自然科学基金(2022HWYQ-078)
山东省"泰山学者"青年专家计划(Tsqn202103074)
出版年
2024
NETL
NSTL
万方数据