降压开采条件下胶结型深海能源土力学特性离散元模拟

Numerical Simulation of the Mechanical Properties of Gas Hydrate-Bearing Marine Sediments Using the Discrete Element Method Under Depressurization Conditions

降压开采会造成影响深海能源土宏观力学特性发生显著变化,而胶结型是天然气水合物赋存于深海能源土储层的主要类型,因此降压开采条件下胶结型深海能源土力学特性研究对于提高天然气水合物开采效率,预防海洋灾害具有重要意义。研究了胶结型深海能源土降压开采时的胶结和损伤影响,构建了三维离散元(Discrete Element Method,DEM)数值模型,并分析了围压、饱和度和损伤对于降压开采条件下胶结型深海能源土力学性能影响。研究结论对于深海能源土储层中天然气水合物开采研究具有较好的借鉴意义。

Depressurization mining can cause significant changes in the macroscopic mechanical properties of marine sedimentary energy soil,while cemented type is the main type of natural gas hydrate stored in the marine sedimentary energy soil reservoir.Therefore,it is of great significance to study the mechanical properties of cemented deep sea sedimentary energy soil under depressurization mining conditions to improve the efficiency of natural gas hydrate exploitation and prevent marine disasters.This article studies the effects of bonding and damage on cemented deep sea sedimentary energy soil during depressurization mining,constructs a three-dimensional discrete element numerical model,and analyzes the influence of confining pressure,saturation and damage on the mechanical properties of cemented deep sea sedimentary energy soil under depressurization mining conditions.The research conclusions have good reference significance for the research of natural gas hydrate exploitation in the sedimentary energy soil reservoir of the deep sea.