An integrated SAGD numerical simulation model is described by combining the modules of the newly developed 1D multi-phase flow in horizontal wellbores with the steam flooding numerical simulation model. The behavior of steam chamber is calculated with the simulator and the results show that the simulator is effective for the SAGD simulation with horizontal wells. Several important factors influencing the size and the shape of the steam chamber are analyzed for the needs of practical SAGD designs.

A new solution method to compositional model is investigated,which is implicit to pressure and saturation of oil and gas,and explicit to mole fractions of components.The number of equations to be solved simultaneously is much less than that of the fully implicit method,but the stability is as good as such one.It is also shown that the present compositional software have good accuracy and exciting computation speed.