基于滞回环的含蜡原油触变模型评价

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1、第31卷第3期石油学报Vo1．31No．32010年5月ACTAPETROLEISINICAMay2010文章编号：0253—2697(201())03—0494—07基于滞回环的含蜡原油触变模型评价张劲军国丽萍(1中国石油大学城市油气输配技术jE京市重点实验室北京102249；2．中国石油大学石油工程教育部重点实验室北京102249；3．大庆石油学院石油工程学院黑龙江大庆163318)摘要：触变性是含蜡原油的一个重要流变特性，对输油管道停输再启动过程的水力特性及安全性至关重要。通过实验，研究了4种含蜡原油在剪切速率先呈线性增大后呈线性减小这一循

2、环加载条件下的滞回环特性。利用最小二乘原理，分别对剪切速率循环一次得到的单一滞回环和剪切速率变化率不同的多个循环得到的多个滞回环进行了拟合。用平均偏差作为统计指标，对8个触变模型进行了评价。结果表明，基于Cheng的含蜡油品中存在完全可逆和完全不可逆两类结构，在Houska模型的基础上建立的模型最适合于描述含蜡原油的滞回环特性。关键词：输油管道；含蜡原油；滞回环；础变模型；评价中图分类号：TE732．3文献标识码：AAssessmentofthixotropymodelsforwaxycrudebasedonthehysteresisloopZH

3、ANGJinjun’GUOLiping’’。(1．BeijingKeyLaboratoryoJUrbanOilandGasDistributionTechnology，ChinaUniversityofPetroleum，Beijing102249，China；2．KeyLaboratoryforPetroleumEngineeringoftheMinistryofEducation，ChinaUniversityofPetroleum，Beijing102249，China；3．CollegeofPetroleumEngineering，Daq

4、ingPetroleumInstitute，Daqing163318，China)Abstract：ThethixotropyofwaxycrudeisanimportantrheologicalbehaviortOthehydrauliccharacteristicsandsafetyintherestartprocessofoilpipelines．Thehysteresisloopsoffourtypesofwaxycrudewereexperimentallystudiedunderthecyclicshearingcondi—tiono

5、ffirstlyincreasinginlinearpatternandthendecreasingofshearrate．Thedataofsinglehysteresisloopobtainedfromtheshearrateofonecyclingandthemultipleloopsobtainedfromtheshearcyclingatvariousshearrateswerefittedrespectivelyusingtheleastsquare．Theaverageabsolutedeviationwastakenasthest

6、atisticalindextOtheexperimentaldata．Eightthixotropymodelsweree—valuatedbytheleastsquareregressions．Amongeightmodels，fiveonesaredevelopedspeciallyforwaxycrudes，andtheotherthreeonesaredevelopedforhumanbloodandprovedtObesuitablefordescribingthehysteresisloop．hisconcludedthatthem

7、ostsuitablemodelfordescribingthecharacteristicsofhysteresisloopisdevelopedfromCheng’SideaonthebasisoftheHouskamodelabouttwokindsofstructures(reversibleandirreversiblestructures)existinginwaxyoils．Keywords：oiltransitionpipeline；waxycrude；hysteresisloop；thixotropymodel；assessme

8、nt中国所产原油大多含蜡量较高，凝点高，管道输送基于恒定剪切速率下的剪切应力(或表观黏度)衰减特中存在蜡沉积和较长时问停输后凝管等流动保