天然气水合物沉积物力学性质测试与评价

MEASUREMENT AND ASSESSMENT OF MECHANICAL PROPERTIES OF HYDRATE-BEARING SEDIMENTS

储层力学参数的评价及预测是天然气水合物安全高效开发的关键。笔者从力学试验、本构模型以及离散元数值模拟等方面介绍了含水合物沉积物力学性质测试及数值计算研究新进展,分析总结了力学参数评价及预测的主要方法及其特点,探究了目前含水合物储层力学性质测试及评价研究存在的问题及其主要原因。为了更好的解决相关工程技术问题,笔者建议通过结合室内试验与数值模拟的方法对水合物储层力学特性及破坏机制进行分析,针对不同工况条件及储层特征建立更加准确的力学参数计算模型。

Right estimation and prediction of mechanical properties of reservoirs are the keys to natural gas hydrate development in an economic,safe,and efficient manner.In this paper,recent advances in measurement and numerical calculation of mechanical properties of hydrate-bearing sediments are summarized respectively from the viewpoints of testing,modeling,and discrete element numerical simulation,etc.The primary methods for evaluating and predicting the mechanical parameters and their characteristics are analyzed.The existing problems and causes in the measurement and estimation of mechanical characteristics are discussed in depth.In order to solve the concerned geological problems,the mechanical behaviors and failure mechanism should be investigated by combining the experimental measurement and numerical simulation in the future,and a more accurate calculation model needs to be established for obtaining more accurate mechanical parameters under specific operating conditions and reservoir characteristics.