Optimization design of horizontal well in interbedded super-heavy oil reservoir
Li Shuang(Research Institute of Changcheng Drilling and Exploration Engineering, CNPC, Panjin 124010, China).
In order to improve the producing degree of XLT super-heavy oil reservoir in Block D-84, the oil layers of XLT Ⅻ and Ⅷ Formations in this block are selected for the deployment of inter-well infill horizontal wells at its western section where the producing degree by vertical wells is poor. By using STARTS numerical simulation model, the parameter optimization design is conducted for these deployed horizontal wells. According to the result of research, the development of medium-thick interbedded reservoirs in Block D-84 by deploying inter-well infilling horizontal wells will produce certain economic benefits only when the effective thickness of individual layer is more than 5m,the length of horizontal section is 300 to 400 m, the steam quality at bottom hole is 50%, the velocity of steam injection is 350t per day, the intensity of steam injection is 15 to 20t per meter and the rational fluid production rate is 40 to 50t per day. This optimization design research has provided the scientific basis for development of medium-thick interbedded and super-heavy oil reservoir by using horizontal wells and combination of vertical wells and horizontal wells.
【CateGory Index】： TE345