Experimental investigation of hydrate formation in water-dominated pipeline and its influential factors

作     者：Li Huang Jia-le Kang Xiao-dong Shen Jian-ye Sun Qing-guo Meng Qiang Chen Gao-wei Hu Chang-ling Liu Neng-you Wu Li Huang;Jia-le Kang;Xiao-dong Shen;Jian-ye Sun;Qing-guo Meng;Qiang Chen;Gao-wei Hu;Chang-ling Liu;Neng-you Wu

作者机构：Key Laboratory of Gas HydrateMinistry of Natural ResourcesQingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral ResourcesPilot National Laboratory for Marine Science and TechnologyQingdao 266071China College of Marine Science and TechnologyChina University of GeosciencesWuhan 430074China State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationChengdu University of TechnologyChengdu 610059China 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2022年第5卷第2期

页      面：310-321页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：funded by the National Natural Science Foundation of China(42076217,41976205) Shandong Provincial Taishan Scholars Special Expert Project (ts201712079) Marine Geological Survey Program (DD20190231) Shandong Natural Science Foundation(ZR2017BD024) 

主　　题：Pipeline Water production Circulation Gas hydrate Formation morphology Gas concentration Flowrate NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea 

摘      要：Blockage in water-dominated flow pipelines due to hydrate reformation has been suggested as a potential safety issue during the hydrate *** this work,flow velocity-dependent hydrate formation features are investigated in a fluid circulation system with a total length of 39 m.A 9-m section pipe is transparent consisted of two complete rectangular *** means of pressurization with gas-saturated water,the system can gradually reach the equilibrium *** result shows that the hydrates are delayed to appear as floccules or thin films covering the methane *** the circulation velocity is below 750 rpm,hydrate is finally deposited as a“hydrate bedat upmost of inner wall,narrowing the flow channel of the ***,no plugging is observed during all the experimental *** five stages of hydrate deposition are proposed based on the experimental *** is also revealed that a higher driving pressure is needed at a lower flow *** driving force of hydrate formation from gas and water obtained by melting hydrate is higher than that from fresh water with no previous hydrate *** authors hope that this work will be beneficial for the flow assurance of the following oceanic field hydrate recovery trials.