Rheological study of methane gas hydrates in the presence of micron-sized sand particles  

作　　者：Bohui Shi Shangfei Song Yuchuan Chen Shunkang Fu Lihao Liu Xinyao Yang Haihao Wu Guangjin Chen Jing Gong 

机构地区：[1]National Engineering Research Center of Oil and Gas Pipeline Transportation Safety,MOE Key Laboratory of Petroleum Engineering,Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum-Beijing,Beijing 102249,China [2]China's Oil and Gas Exploration and Development Company(CNODC),Beijing 100034,China [3]China National Petroleum Corporation Mozambique LDA,Maputo,Mozambique [4]PipeChina West East Pipeline Company,Shanghai 200122,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第6期149-161,共13页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(52104069,U20B6005);Beijing Municipal Natural Science Foundation(3232030);Science Foundation of China University of Petroleum,Beijing(2462023BJRC018,2462020YXZZ045).

摘　　要：Natural gas hydrates,intricate crystalline structures formed by water molecules and small gas molecules,have emerged as a significant and globally impactful clean energy resource.However,their commercial exploitation faces challenges,particularly operational disruptions caused by sand-related blockages.Understanding the rheological properties of hydrate slurry,especially in the presence of micron-sized sand particles,is imperative for ensuring the flow assurance of subsea hydrate exploitation.This study extensively investigates the rheological properties of sand-containing hydrate slurries.The findings reveal that these slurries exhibit non-Newtonian fluid characteristics,including yield stress,thixotropy,and shear-thinning behavior.Solid-like elastic features are observed in sand-containing hydrate slurries before yielding,transitioning to viscous behavior after yielding.Even with a minimal amount of sand,both static yield stress and yield strain experience substantial changes,correlating with the increase in sand concentration.The research conclusively establishes the thixotropic nature of sand-hydrate slurries,where the viscosity decay rate is directly influenced by the shear rate.These insights aim to contribute comprehensively to the development of effective flow assurance strategies,ensuring the safe and stable operation of subsea hydrate exploitation.

关 键 词：Natural gas hydrate production Sand-containing hydrate slurries Yield stress THIXOTROPY Shear-thinning behavior 

分 类 号：TE53[石油与天然气工程—油气田开发工程]