摘要
海底天然气水合物(以下简称水合物)的开采会劣化储层的力学性质,威胁钻井平台、破坏开采井甚至可能诱发地质灾害。为探究含水合物沉积物的力学特性及开采扰动下水合物储层的力学强度劣化机理,本文搭建了一套含天然气水合物土水-力特性联合测试装置,主要包括:压力室、压力控制系统,注/除气系统,温度控制系统,数据采集及人机交互管理系统。该装置可实现不同条件下含水合物沉积物试样的合成,并可开展渗透试验、等向压缩试验、以及不同应力路径下三轴压缩试验测试。以细砂作为赋存介质,采用富气法制备含天然气水合物沉积物试样,对其进行了一系列水-力特性试验测试,并对结果进行了简要地分析。这些试验结果证实了装置测试含水合物沉积物水-力学特性的功能和可靠性。
The exploitation of methane hydrate from seafloor could degrade the strength properties of the reservoir,and further induce the geological disasters,threatening safety of the drilling platform and the exploitation well.This paper aims to explore the mechanical properties of hydrate-bearing sediments and reveal the mechanism of mechanical strength deterioration of hydrate reservoirs induced by hydrate exploitation.It develops a set of hydraulic-mechanical united experiment apparatus for hydrate-bearing sediment.This apparatus consists of the pressure chamber,pressure-control system,supply/exhaust gas system,temperature control system,data acquisition and human-computer interaction management system.Based on these components,this apparatus can be used to synthesize the methane hydrate-bearing sediment sample,and perform the permeability measurement test,the isotropic compression test and the triaxial compression test under different stress paths.For illustrating the functions of this apparatus,methane hydrate-bearing fine sand specimens are prepared by excess-gas method.The hydraulic-mechanical characteristics are measured.The experimental results are analyzed briefly,and confirm the function and reliability of the apparatus for measuring the hydro-mechanical properties of hydrate bearing sediments.
作者
杨德欢
颜梦秋
陆地
颜荣涛
韦昌富
田慧会
YANG Dehuan;YAN Mengqiu;LU Di;YAN Rongtao;WEI Changfu;TIAN Huihui(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Wuhan 430071,China)
出处
《工程地质学报》
CSCD
北大核心
2021年第6期1722-1732,共11页
Journal of Engineering Geology
基金
国家自然科学基金(资助号:11962004,51639008)
广西自然科学基金(资助号:2017GXNSFAA198215).
关键词
水合物
联合测试装置
含水合物细砂
水-力特性测试
性能评价
Hydrate
United experiment apparatus
Hydrate-bearing fine sand
Hydro-mechanical characteristic test
Performance evaluation
作者简介
第一作者:杨德欢(1990-),男,博士生,主要从事含水合物沉积物力学特性方面的研究.E-mail:ydh9008@126.com;通讯作者:颜荣涛(1984-),男,博士,教授,硕士生导师,主要从事土力学的教学工作和含水合物土力学特性的研究工作.E-mail:yrt301@163.com。
