Study on Viscous Wall Temperature of Water-containing Crude Oil in Ambient Temperature Transfer System of MH Oilfield
The crude oil in MH oilfield contains wax and is easy to condense,and the probability of crude oil sticking to the wall increases in the process of ambient temperature gathering and transportation in winter extreme cold(-40℃),which threatens the safe operation of pipeline.Therefore,there is an urgent need to determine the possibility of ambient temperature transfer in the MH field under actual operating conditions as well as under future conditions.The viscous wall temperatures of oils from various transfer stations in the MH field at different water contents and different flow rates were measured by a modified cold finger experiment,and the extreme gradient ascent(XGBOOST)algorithm was used to carry out viscous wall temperature prediction.The results show that viscous wall temperatures of crude oil at M131,M18,BL and M2 transfer stations at 55%-80%water content and 0.90-2.72 m/s flow rate are all lower than the freezing point by 0.25-11.01℃,and the tendency to viscous wall of the crude oil decreases with the increase of the water content and mobility,and the viscous wall temperature decreases.The average error between the viscous wall temperature prediction results of XGBOOST algorithm and the experimental results under different working conditions is only 8.36%.The importance of crude oil viscous wall temperature with respect to each factor is ranked as follows:water content,crude oil freezing point,flow rate,and the XGBOOST algorithm can be used to predict the feasibility of ambient temperature transfer under variable operating conditions in the MH oilfield transfer system.
water-containing crude oilambient temperature transferviscous wall temperaturecold finger experiment
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