Differential Pressure Calculation During Pipeline Transportation For Water-cut Heavy Crude

Two-phase flow of mixture of oil and water exists in petroleum industry widely,especially when the oilfield enters its production tail. With the increase of water content ratio in producing liquid,two-phase flow of mixture of oil and water will be found either in interspaces of rocks underground or in pipelines on ground. Usually invest in construction of gathering and transporting pipelines is 30% the total invest of ground project,and energy consumption of gathering and transporting is 40% of the total energy consumption of produce. Therefore it is important to research on rheological property of mixture of oil and water and economical design of its gathering and transporting pipeline.Because of the infusibility of oil and water,its mixture will present suspended state or emulsified state and its rheological property varies obviously. It is a particular and complicated task to research on the flow of mixture of oil and water because of its complicated rheological property and its large difference of pressure drop under different float state. To fulfill this task in this paper,hydrous super heavy crude of Liaohe oilfield is selected as the object. And also numerical simulation of two-phase flow of oil and water is based on the flow of this hydrous super heavy crude.For the reason of non-Newton properties formula used for hydrodynamic calculation are not suit for the mixture of oil and water. So in this paper some methods and formula fit for calculation are supplied after many experiments. And also with the help of software of excel,origin and Jandel SigmaPlot some formula for calculation of viscosity are offered to instead the old ones in which do not include shearing speed.In this paper,oil-water two-phase flow in a vertical pipe is simulated in numerical method. Firstly,the laminar oil-water volume averaged equations(also fit for transient turbulent flow)were achieved by using volume average method. Then time-averaged turbulent two phase flow control equations were presented,and use k ?εmodel to close the oil phase shearing turbulent flow. Finally the practical cylindrical coordinating control equations are given.On thought of material properties of the two-phase flow itself confirm it as steady and fully developed vertical flow. So view it as parabolic flow. After the dispersion of general gas-liquid two-phase flow dynamics equations,interfacial momentum transfer is modeled precondition that the system is adiabatic,non-inner source,equal pressure at any cross-section and uniformed scale. Drag force,virtue mass force and shift force are presented in this part crystallized. Because of parabolic flow,the outlet boundary condition isn't necessary."Wall function"method was used to handle with wall boundary condition.At last Phoenics3.4 is use to calculate this two-phase flow.