Research on bottom water distribution law and parameter optimization of bottom water reservoir:A case of Yan'an Formation reservoir in Zhouchang Oilfield
The recovery rate is low,production declines fast,and stable production is difficult due to the strong randomness of early well layout,no well pattern and no specific development plan in the study area.To clarify the influence of perforating parameters on the development of bottom-water reservoirs,the reservoir geological parameter analysis and reservoir numerical simulation were used to analyze the development effects of different bottom-water reservoirs under different perforating parameters.The results show that:1)The oil well response and development effect are different due to the perforated thicknesses in water injection wells in Yan10 Formation,the main oil layer with well-developed bottom water in the study area.2)The target reservoir can be divided into direct contact type,unstable interlayer type,and stable interlayer type according to the interlayer distribution and the oil/water contact relationship.3)The higher the perforation degree,the more beneficial it is to inhibit bottom water inrush,and the best perforation thickness is about 2 m in type Ⅰ reservoir directly contacting bottom water.4)The higher the perforation degree of the water injection well,the better the development effect;the development effect is good when the oil well perforation degree reaches about 70％in type Ⅱ/Ⅲ reservoir separated from bottom water by interlayers.The research results have guiding significance for the design of development parameters,the oil stabilization and water control,and enhanced oil recovery for the same type of bottom water reservoirs.
bottom water reservoirperforating thicknessnumerical simulationparameter optimizationinterlayer
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