苏嵯管道混输原油蜡沉积规律及清蜡周期研究

发布时间：2018-04-13 17:43

本文选题：苏嵯管道 + 混合原油　；参考：《东北石油大学》2017年硕士论文

【摘要】：近年来,随呼伦贝尔油田产量递减,承担其原油外输任务的苏嵯输油管道逐渐进入低输量运行阶段,为保证其安全运行,该管道目前采取混合塔木察格原油提高输量的输送方式,但由于呼伦贝尔和塔木察格原油的化学组成差异较大,导致混合原油的析蜡特性和相关基础物性发生较大改变,增加了对管道实际运行条件下的结蜡规律及清防蜡措施制定的难度。因此,开展苏嵯输油管道混合输送塔木察格和呼伦贝尔原油的蜡沉积规律及清蜡周期研究,为管道的实际运行管理提供辅助决策依据,具体包括以下研究工作:首先,采用旋转流变仪、差示扫描量热仪和凝点测定仪等测定不同比例混合原油的凝点、密度、粘度和析蜡热特性参数等基础物性参数,在此基础上,通过数理统计方法回归得到不同比例混合原油的粘温方程和蜡晶溶解度系数与温度的关系函数,为蜡沉积规律研究及蜡沉积预测模型建立奠定基础。其次,以压差法为基本原理,设计安装了一套室内环道蜡沉积模拟实验装置,应用该装置对不同比例混合原油在不同油温、壁温和流量下的蜡沉积规律进行实验研究,根据实验结果对影响管道蜡沉积的相关因素及其具体作用规律进行分析。基于主成分分析法对输油管道蜡沉积的影响因素进行权值分析,得出各因素对管道蜡沉积影响程度的显著性等级。在此基础上,基于实验数据,以蜡沉积倾向系数法为基础,采用回归分析法得出适用于不同比例混合原油的苏嵯输油管道蜡沉积预测模型。最后,依据所获得的蜡沉积预测模型,在综合考虑管道实际运行的动力费用、燃料费用和清蜡费用基础上,建立了苏嵯输油管道的清管周期计算模型。根据管道的实际运行工况及周围环境条件分析了运行温度、季节条件等对管道输油动力费用、燃料费用及清管费用的影响规律,进一步得出不同工况下苏嵯输油管道的最优清蜡周期。
[Abstract]:In recent years, as the production of Hulunbeir oil field decreases, the Su-ao oil pipeline, which undertakes the task of transporting crude oil out of the oil field, has gradually entered the stage of low-volume operation, in order to ensure its safe operation.At present, the pipeline adopts mixed Tamchag crude oil transportation mode to increase the transportation capacity, but the chemical composition of Hulunbeir crude oil and Tamchage crude oil differ greatly, which results in a great change in wax evolution characteristics and related basic physical properties of mixed crude oil.It also increases the difficulty of wax deposit law and paraffin control measures under the actual operation condition of pipeline.Therefore, the research on wax deposition law and wax cleaning period of mixed transportation of Tamchag and Hulunbeir crude oil in Su-ao oil pipeline will provide auxiliary decision-making basis for the actual operation and management of the pipeline, including the following research work: first,Based on rotating rheometer, differential scanning calorimeter (DSC) and condensate point tester, the basic physical parameters, such as freezing point, density, viscosity and thermal characteristic parameters of wax separation, were measured.The viscosity temperature equation of mixed crude oil with different proportion and the relation function between wax solubility coefficient and temperature were obtained by regression of mathematical statistical method, which laid a foundation for the study of wax deposition law and the establishment of wax deposition prediction model.Secondly, based on the principle of pressure difference method, an indoor loop wax deposition simulation device is designed and installed. The wax deposition law of mixed crude oil with different proportion under different oil temperature, wall temperature and flow rate is studied experimentally.Based on the experimental results, the related factors affecting wax deposition in pipelines and their specific action rules are analyzed.Based on the principal component analysis (PCA), the influential factors of wax deposition in oil pipeline were analyzed, and the significance of each factor on wax deposition in pipeline was obtained.On this basis, based on the experimental data and based on the wax deposition tendency coefficient method, a prediction model of wax deposition in Su-ao oil pipeline suitable for mixed crude oil with different proportions is obtained by using regression analysis method.Finally, based on the obtained prediction model of wax deposition, the calculation model of the cleaning period of Su-ao oil pipeline is established on the basis of considering the power cost, fuel cost and wax cleaning cost of the pipeline.According to the actual operating conditions and surrounding environmental conditions of the pipeline, the effects of operating temperature and seasonal conditions on the pipeline transportation power cost, fuel cost and pipeline cleaning cost are analyzed.Furthermore, the optimal wax removal period of Suzao oil pipeline under different working conditions is obtained.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE832

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