Method for determining temperature boundary of low temperature gathering and transportation of crude oil in extra-high water cut period
As domestic oil fields gradually enter the late stage of exploitation,viscous wall temperature as the evaluation index of high water and low temperature collection with a comprehensive water content of 70％-90％has entered the promotion stage and the effect is remarkable.However,in the field cooling test,it is found that there is a certain error between the actual operating temperature of ultra-high water cut crude oil pipelines with water content of more than 90％and the prediction results of viscous wall temperature.Therefore,it is of great significance to study the temperature boundary conditions of low temperature gathering and transportation for extra-high water cut crude oil.In this paper,the characteristics of oil-water two-phase flow and oil-phase wall adhesion in the extra-high water cut period are analyzed.It is determined that the yield stress is the most important factor that prevents the viscous wall oil from being washed away in the pipeline.The prediction software of low temperature collection temperature for extra-high water cut crude oil is developed and verified by the field cooling test of single well collection pipeline.The error is within 2℃,which meets the engineering application requirement.
extra-high water cut crude oilsticky wall condensatelow temperature gathering and transportationtemperature boundary conditionerosion stress
万方数据
维普
