The research on well pattern adjustment strategy of PL oilfield

PL oilfield adopts commingled production with big intervals, which causes serious conflict among layers, so layer system and well pattern adjustment of later stage is required, at this time we will need to determine the scope of the reasonable well spacing. Three main pay formations of PL oilfield has a big difference in crude oil viscosity, which also have different reservoir property. On the basis of the analysis of actual production condition, numerical simulation model is set up separately for each reservoir. Results showed that the ultimate recovery degree under different well spacing were similar with the present condition of mining. But with the increase of well spacing, the increased amplitude of the recovery degree becomes smaller than before, the time to achieve the ultimate recovery increases. In order to further determine the scope of the rational well spacing, the concept of pseudo oil production rate is introduced. On the basis of the actual oil production rate, determine the scope of the reasonable well spacing of each reservoir on the condition that the pseudo oil production rate was 2%, and analyze its reasons. Considering the practical mining conditions and the drilling cost, the layer combination and well pattern of PL oilfield has been adjusted, its development effect and economic benefits are predicted through the numerical simulation model. The research for PL oilfield late development adjustment provides a certain theoretical basis, which also has guiding significance for other oilfields to improve development effect.