基于正交试验的输油管道压降敏感性分析

Sensitivity Analysis of Pressure Drop of Oil Pipeline Based on Orthogonal Test

多相混输管道的压降计算是油气集输管道设计和生产运行方案制定的基础。明确影响管道压降的主要因素及其敏感性,对管道设计及运行方案的优化具有重要意义。根据塔河油田集输管网实际运行情况,以沿程百米压降为目标函数,分析了原油黏度、管道管径、液相含水率及管道入口温度(管道入口处油气水混合物温度)对混输压降影响程度。选择Beggs-Brill压降模型,并用实测数据拟合当量表观黏度,对模型进行修正,利用修正后的模型进行正交试验计算。通过对正交试验结果的极差分析,可知各因素的影响程度为:管道入口温度>管道内径>液相含水率>原油黏度。可为输油管线结构设计和运行方案提供参考。

Pressure drop calculation of multiphase pipeline is the basis of design and production operation plan formulation of oil and gas gathering and transportation pipeline. It is of great significance to determine the sensitivity of different gathering and transportation parameters to the pressure drop of mixed transportation for the optimization of pipeline design and operation scheme. Based on the actual operation of the gathering and transportation pipeline network in Tahe oilfield, the influence of crude oil viscosity, pipe diameter, liquid water content and pipeline inlet temperature(oil-gas-water mixture temperature at the pipeline inlet) on the pressure drop of mixed transportation was analyzed with the pressure drop of 100 meters as the objective function. Beggs-Brill pressure drop model was selected, and the measured data were used to fit the equivalent apparent viscosity. The model was modified, and the orthogonal test calculation was carried out by using the modified model. Through the analysis of the range of orthogonal test results, the degree of influence of each factor was determined as follows: pipe inlet temperature > pipe inner diameter > liquid phase water content > crude oil viscosity. The results of this study can provide powerful reference for the design and operation of oil pipeline structures.