Research On Numerical Well Test Analysis Method Based On Finite Element Method

In recent years,many oilfields have entered the middle and late stages.The distribution of oil and gas in the oil layer has become more complicated.It is very important to establish a multi-phase fluid test analysis model.In the traditional well test analysis,the analytical method is usually used to solve the well test theory model.In this progress,the well test theory model is mainly a single phase homogeneous reservoir.When the oil water two-phase flow test problem is analyzed,the numerical solution is more in line with the actual situation of the reservoir.In this paper,the oil-water two phase well test problem is analyzed by the finite element method in the numerical method.The oil-water two phase finite element well test model is set up.The oil water two phase numerical well test simulator is developed in consideration of the effect of the wellbore reservoir effect and the skin effect.The well test analysis for the complex condition reservoir is analyzed by the finite element method.It is provided for theoretical guidance.The specific research contents of this paper are as follows:1.Establish a finite element mathematical model of oil-water two phase flow which considered the influence of wellbore storage effect and skin effect.2.Compile a numerical well test simulator under the condition of oil-water two-phase flow.3.The numerical solution of the single-phase flow model in the oil water two-phase flow numerical well test simulator is analyzed and compared with the analytical solution.The correctness and reliability of the single-phase flow model in the numerical well test simulator are verified.4.Comparing the numerical results of the two-phase flow model with the analytical results of the single-phase flow model,and verify the correctness of the two phase flow model in the well test simulato.5.Analyze the sensitivity factors of the oil water two-phase flow test curve used by the simulator,and discuss the influence law of the phase seepage curve,initial oil saturation and crude oil viscosity on the well test curve.