高含水原油在不同管材中的低温集输特性研究

Study on Low-Temperature Gathering and Transportation Characteristics of High-Water-Cut Crude Oil in Different Pipeline

目前,我国大部分油田已进入高含水期,采出液的流动特性发生变化,使降低集输温度成为可能。然而,关于管道材质对低温集输特性影响的研究相对较少。因此,利用现场实验装置对钢管与玻璃钢管中高含水原油低温集输特性进行了研究。结果表明,管线降低掺水量之后,井口回压上升,实验管道末点的油温缓慢下降;不同掺水量下井口回压上升过程不同,高掺水量下更容易实现低温集输;当掺水量相同时,玻璃钢管的黏壁温度低于钢管的黏壁温度,玻璃钢管低温集输的最低掺水量低于相同情况下钢管的掺水量。对黏壁温度实验数据进行拟合,得到了不同管材的黏壁温度计算模型,计算结果准确度较高,对高含水期油田实际生产中低温集输的可行性判断及其安全运行管理具有指导意义。

At present,most oil fields in China have entered the high water cut period,and the flow characteristics of produced fluid have changed,so it is possible to reduce the temperature of gathering and transportation.However,there are relatively few studies on the influence of pipeline materials on low-temperature gathering and transmission characteristics.Therefore,the characteristics of low-temperature gathering and transportation of high water content crude oil in steel pipe and fiberglass pipe are studied.The results show that the wellhead back pressure rises and the oil temperature at the end of pipeline drops slowly after the water content of the pipeline is reduced.The wellhead back pressure rises differently under different water content.When the water content is the same,the temperature of fiberglass pipe is lower than that of steel pipe,and the minimum water content of fiberglass pipe for low-temperature gathering and transportation is lower than that of steel pipe under the same condition.Based on the experimental data of viscosity wall temperature,the calculation models of different pipe materials are obtained,and the calculation results are accurate,which has a guiding significance for the feasibility judgment and safe operation management of the oil field in the high water cut period.