Study on development well pattern density of deep oil-bearing strata in Loufangping oil area of Wuqi Oilfield
In order to develop the unused Chang8 and Chang9 reservoirs reasonably and efficiently,it is necessary to establish a set of reasonable well pattern system to accumulate experience and guide the efficient and reasonable development of other deep oil-bearing areas in Wuqi Oilfield.According to the correlation between well pattern density and recovery efficiency under different mobility,the well pattern density of Chang8 and Chang9 reservoirs in the study area is 6.8 wells/km2.In fact,the well pattern density of the developed Triassic oilfield in the west of Yanchang Oilfield is 9.2～18.0 wells/km2.Considering the connection of new and old well patterns,it is determined that the development well pattern density of Chang8 and Chang9 reservoirs should be 10～15 wells/km2 and the well pattern density deployed at 300 m well spacing is more suitable.On the basis of the analysis of the maximum principal stress and fracture orientation in the study area,the well pattern plan is deployed on the basis of the original 300 m～300 m square well pattern as far as possible to inherit the original well pattern.300× 300 square reverse nine-point well layout is adopted,and the reverse nine-point water injection is adopted.The above results have certain guiding value to the development of deep reservoir in Wuqi oilfield.
well pattern densityChang9 oil formationLoufangping oil areaWuqi Oilfield
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