Research On Multiphase Measurement Simulation Technology Of Oil Well

Oil,gas,water three-phase holdup and flow of oil well is the main basis on monitoring,controlling the dynamic characteristics of oil well and reservoir.A kind of continuous,on-line measuring multiphase flowmeter will provide convenience for oil field development.In the international development of the multi-phase flowmeter,the usual throttling set, such as standard orifice is used to reflect the mixed-flow velocity,but has not been based on the theory.The research background of the multiphase flow on-line measuring system is shown in this paper.According to performing the multiphase flow measurement using standard orifice,on base of a great deal of experiment,simulation study on fluid fields when different fluid flow through standard orifice with CFX is performed,considering working condition parameters of practical measurement and boundary conditions comprehensively.The main contents are as follows:Main technology method of multiphase flow measurement and multiphase measuring system subject research base on have been introduced;The single-phase water,air and gas/water experiment is performed to understand the system operation conditions,observe the experiment phenomenon,obtain the range of parameters.Experiment data is provided for the subsequent simulation;The relation between difference pressure signal and flow mass,difference pressure signal and velocity through the orifice flowmeter is analyzed and transmitted;Physical model is set up,and mesh generation is completed,according practical problem;According to the working condition,boundary condition is set up. Respective fluid field is simulated when single-phase flow(water,air) and multiphase flow (gas/water,oil/gas,oil/water) get through standard orifice to get multi-group pressure difference—velocity relation curves.Simulation results of the single-phase indicate the correctness of simulation and the feasibility with code CFX;Simulation results of the gas/water,oil/gas,oil/water verify that performing the multiphase measuring with standard orifice is feasible theoretically.