In order to study the influence and changing law of the offshore extra-heavy oil pipeline viscosity measurement and pipeline transportation calculation methods on the pipeline transportation pressure drop, a PIPEFLOW transportation model of offshore extra-heavy oil pipelines in an offshore oilfield is set up.The changing law of parameters such as pressure in the extra-heavy oil pipeline trans-portation process of the offshore oilfield is simulated by the model,and the influence of different viscos-ity measuring methods of extra-heavy oil and corresponding pipeline transportation calculation methods on transportation pressure drop is analyzed. Studies show that in the working conditions with low wa-ter content, the pipeline transportation pressure drop values corresponding to the viscosity got by the conventional method are larger; when the water content reaches 70%, the pipeline transportation pres-sure drop values corresponding to the viscosity got by the conventional method, the stirring method and the ring method are close to each other; when the water content is more than 70%, the pressure drop values corresponding to the stirring method are the largest.%为研究海上特稠油黏度测量及管输计算方法对管线输送压降的影响及变化规律,建立了某海上油田特稠油管线的PIPEFLOW输送模型.利用该模型,仿真模拟该油田特稠油管线输送过程中压力等参数的变化规律,分析特稠油不同黏度测量方法及对应管输计算方法对输送压降的影响.研究表明:在含水率较低的输送工况下,常规法测量所得黏度对应的管线输送压降值较大;当含水率达到70%时,常规法、搅拌法和环道法测量黏度所对应的管线输送压降值比较接近;当含水率超过70%时,搅拌法测量黏度模拟计算压降值最大.
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