稠油热采三重介质三渗模型及压力动态分析

Subjects: Mechanics >> Hydromechanics submitted time 2022-11-01 Cooperative journals: 《应用力学学报》

陈帅1 ,孙可明2

Abstract： To study the characteristics of the wellbore pressure changes of thermal recovery of heavy oil in carbonate reservoirs,considering the effect of temperature on viscosity of oil and stress sensitivity of reservoirs,the triple permeability mathematical model in triple media has been constructed.The mathematical model is of nonlinear partial differential equations with variable coefficients.The difference equations have been discretized by the fully implicit finite difference scheme.Newton-Raphson method has been used for solving nonlinear difference equations.The Jacobi matrices of the difference equations are tridiagonal matrix.Using the properties of tridiagonal matrix,the iteration speed is improved.According to the calculation results,the typical well test curves have been plotted.Sensitivity of parameters has been analyzed.There are eight stages of pressure response.The sensitivities of viscosity depend on temperature are different in different reservoirs.The higher the sensitivities of viscosity depend on temperature,the greater the values of pressure in reservoirs.When the cross flow stages are earlier,the time of the cross flow between the fractures and vugs is shortened and the strength is weakened,causing the earlier decrease in the pressure derivative.

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