In order to improve the dynamic control ability of multiphase flow in heavy
oil reservoir by steam injection, he put forward the sequential solution
method of multiphase flow in heavy oil reservoir by steam injection based on
numerical oscillation, established saturation equation and dynamic equation
of multiphase flow in heavy oil reservoir by steam injection, solved the
output pressure of multiphase flow in heavy oil reservoir by pressure
equation based on volume conservation, and established the sequential
solution model of all-component model of multiphase flow in heavy oil
reservoir by steam injection. The output pressure of multiphase seepage in
steam injection-production heavy oil reservoir is transformed into parabolic
variable, and the saturation and composition are hyperbolic variable models.
Through the analysis method of saturation and composition characteristics of
all-component model, combined with the pressure signal analysis of numerical
oscillation, empirical mode decomposition and spectrum analysis methods are
adopted to realize the velocity parameter analysis and multiphase seepage
sequence analysis of steam injection-production heavy oil reservoir, and the
numerical oscillation analysis and parameter estimation of multiphase
seepage in steam injection-production heavy oil reservoir are realized by
establishing the sequential solution algorithm of steam injection-production
heavy oil reservoir. The simulation results show that this method is used to
solve the multiphase seepage sequence of heavy oil reservoir by steam
injection, and the parameter estimation accuracy is high, which improves the
calculation efficiency of numerical simulation of steam injection and
production. The calculation efficiency and accuracy of this algorithm in
two-dimensional and three-dimensional examples with gravity are verified by
examples.