Wellbore constrained equations were deduced considering separated layer water injection in a heavy oil model. A numerical model constrained by fine separated layer water injection was constructed. A linear system consisted of a seven-diagonal sparse coefficient matrix with attached columns and rows was derived, which was solved by partitioned matrix multiplication combined with preliminary treatment of conjugate gradient. Development effects of separated layer water injection and generalized water injection were compared and influences of segmentation and injection allocation models were assessed.

A new method to investigate optimal development decisions of gas-cycling in condensate reservoirs is presented. It is shown that both the oil recovery and the total net present value of a condensate reservoir can be enhanced obviously through optimization of gas production rate, gas injection rate and the mole fractions of each component in injection gas. The corresponding computer program makes a progress in automatic optimal design of development of condensate reservoirs.