A new way to calculate productivity of five point well pattern at high water cut stage

This paper presents a new way to obtain the instantaneous productivity of five point well pattern in low permeability reservoirs at high water cut stage. Different from the traditional analysis methods or semi-analytical methods, this paper takes the distribution of remaining oil into consideration, and uses the successive steady state method and ‘six step’ to obtain the numerical solution, which is accurate and simple. The effects of parameters including fracture length (the injection well and the production well) and pressure difference between the injection well and the production well were investigated in detail, which have a significant impact on instantaneous productivity. The advantage of the numerical solution is able to understand productivity at different times, and easy to incorporate well spacing and the optimal pressure difference. The amount of computation that this new method needs is very small, and it can also compute quickly and efficiently.