稠油掺稀输送中掺稀比的优化

Optimization of heavy-light ratio for transportation of heavy oil mixed with light oil

掺稀油输送是脱水稠油重要的输送方式之一。为了进行掺稀比的优化,降低稠油输送的能量消耗,以稠油输送动能消耗作为优化目标,建立了动能消耗与掺稀比相互关系的数学模型,并以胜利油田陈南集中处理站为例进行了分析计算。结果表明:稠油掺稀是非常有效的降黏方式,可以大幅度降低混合原油黏度;但是随着掺稀比的增大,稀油增加了混合原油的流量,输送动能消耗增加。因此,稠油掺稀输送存在最优掺稀比,掺稀比过大,反而会增加输送能耗。利用双对数模型和当量黏度的计算方法以及稠、稀油的物性,可以对最佳掺稀比进行计算分析。

Mixing with light oil is one of major transportation approaches for dehydrated heavy oil. In order to optimize the heavy-light ratio and reduce the energy consumption for transporting heavy oil, a mathematical model based on the relationship between consumption of kinetic energy and heavy-light ratio is established to optimize the consumption of kinetic energy during heavy oil transportation. This model was used for analysis and calculation for the Chennan Central Processing Station, Shengli Oilfield. The results indicate that, mixing heavy oil with light oil is a very effective way to lower viscosity, by which the viscosity of mixed oil can be reduced greatly; however, with the increase of heavy-light ratio, the addition of light oil will increase the flow rate of mixed oil, thus increasing the consumption of kinetic energy. Therefore, there is a best heavy-light ratio for the mixing process. The consumption of kinetic energy will increase if the heavy-light ratio is too high. With the log-log model and the calculation approach of viscosity equivalent, and considering the properties of heavy oil and light oil, the best heavy-light ratio can be worked out.