Texture,composition and properties of plugs formed by carbon dioxide hydrate and wax

作     者：SKIBA Sergey SAGIDULLIN Aleksey SHAPOVALOVA Alexandra STRELETS Larisa MANAKOV Andrey SKIBA Sergey;SAGIDULLIN Aleksey;SHAPOVALOVA Alexandra;STRELETS Larisa;MANAKOV Andrey

作者机构：Nikolaev Institute of Inorganic ChemistrySB RASAc.Lavrentiev Ave.3Novosibirsk 630090Russia Novosibirsk State UniversityPirogova Str.2Novosibirsk 630090Russia Institute of Petroleum Chemistry SB RASAkademichesky ave.4Tomsk 634021Russia 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2021年第48卷第6期

页      面：1462-1470页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0708[理学-地球物理学] 082003[工学-油气储运工程] 

基　　金：Russian Science Foundation  RSF  (17-17-01085) 

主　　题：carbon dioxide hydrate hydrate/wax plug plug texture hydrate decomposition 

摘      要：Gas hydrates and wax are the major flow assurance problems for the transportation of produced hydrocarbons through ***,in most research works both these two problems are studied *** simultaneous precipitation or deposition of these compounds in pipelines can lead to different mitigation/prevention strategies,the investi-gations in which both these problems are considered simultaneously appeared only *** is no information in the literature on the texture/composition and features of decomposition process of mixed wax/hydrate *** the same time,this information could be useful to understand how to treat the problem of formation of these *** this work,three wax/gas hydrate plugs were collected at quasi-static conditions from a water-in-oil emulsion to study their texture,composition and the features of decomposition *** X-ray diffraction and IR(infrared spectroscopy)analyses showed that the plugs consisted of wax and gas *** and DSC(Differential Scanning Calorimetry)experiments showed that the main part of gas hydrate in the plugs at the ambient pressure started to decompose at about 268 *** temperature was higher than the equilibrium temperature of carbon dioxide hydrate at this pressure,indicating that the gas hydrate in the plugs could be effectively preserved at temperatures below the ice melting point(273.2 K).It was found through observation of the hydrate decomposition process in the plugs under the microscope that the gas in the samples released in small bubbles,while the hydrate particles were not visible at this magnification,indicating that the hydrate was indeed highly dispersed in the samples.A residual wax was jelly-like after decomposition of hydrate in all the *** experiments showed that the plugs residues after decomposition of the hydrates had higher yield points and viscosities than the initial waxy crude oil origi-nally used for the experiments.