基于差示扫描量热法的含蜡原油析蜡特性测试  

Experiment on wax precipitation property of waxy crude oil based on DSC

作　　者：国丽萍[1] 弋博 陈锐 冯耀国 GUO Liping;YI Bo;CHEN Rui;FENG Yaoguo(School of Petroleum Engineering,Northeast Petroleum University//Key Laboratory of Enhanced Oil&Gas Recovery of the Ministry of Education;Daqing Oilfield Company Limited)

机构地区：[1]东北石油大学石油工程学院·东北石油大学提高采收率教育部重点实验室,黑龙江省大庆市163318 [2]大庆油田有限责任公司

出　　处：《油气储运》2023年第7期799-807,共9页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金资助项目“深水环境下沥青质对油气管道蜡结晶与沉积影响机理研究”,52174057;黑龙江省自然科学基金资助项目“W/O型含蜡原油乳状液依时流变行为机理及其量化表征研究”,LH2020E015

摘　　要：含蜡原油析蜡特性是含蜡原油管道输送经济安全运行和流动安全保障技术的基础参数,传统差示扫描量热(Differential Scanning Calorimetry,DSC)实验方法测量结果受测试条件影响,且测量结果可重复性差。为此,采用DSC和调制差示扫描量热(Modelated Differential Scanning Calorimetry,MDSC)两种方法开展实验测试,分析含蜡原油的析蜡特性,结果表明:降温速率对传统DSC法测量含蜡原油的析蜡特性影响较大,相同条件下,MDSC实验测得的析蜡点温度、累计析蜡量明显高于DSC实验测得的数值;MDSC实验蜡晶析出终了温度明显高于传统DSC实验结果,但两种实验方式蜡晶析出终了温度的累计析蜡量相差不大,且MDSC实验受降温速率的影响较小;从获取含蜡原油析蜡特性效果看,MDSC实验测试结果优于传统DSC实验。研究成果可为含蜡原油析蜡特性测试实验方法及条件的选取提供依据。Wax precipitation property of waxy crude oil is a basic parameter for the economic&safe operation and flow security assurance technology of waxy crude oil pipeline transportation.The conventional Differential Scanning Calorimetry(DSC)experimental method has its accuracy greatly dependent on the experimental process,with poor repeatability of measurement results.Given this reason,experiment was conducted with two methods:DSC and the Modulated Differential Scanning Calorimetry(MDSC).Meanwhile,the wax precipitation property of waxy crude oil was analyzed.The results show that the cooling rate is more influential on the wax precipitation property of the waxy crude oil that is measured by the conventional DSC method.Under the same conditions,both of the wax precipitation temperature and the cumulative amount of precipitated wax measured by MDSC are obviously higher than those measured by DSC.The final temperature of wax crystal precipitation in MDSC experiment is obviously higher than that in the conventional DSC experiment,whereas there is no significant difference in the two cumulative amounts of precipitated wax at the final temperatures in the two experiments,and the MDSC experiment appears to be less affected by the cooling rate.Judging from the effect of obtaining the wax precipitation property of waxy crude oil,MDSC experimental results are superior to the conventional DSC experiment.The research results could provide a basis for the selection of experimental methods and conditions for the wax precipitation property of waxy crude oil.

关 键 词：含蜡原油 差示扫描量热 调制差示扫描量热 降温速率 析蜡点 析蜡量 

分 类 号：TE832[石油与天然气工程—油气储运工程]