Optimization of the parameters of the prediction formula for the time to see water in wells with different entrapments in block N bottom-water reservoirs
Bottom-water reservoir bottom-water cone into,so that the oil wells see water too early,resulting in rapid increase in water content,oil production rapidly decreasing,in order to change these unfavorable factors,early prediction of the time to see water in the oil wells is particularly important.Usually,bottom-water reservoirs can be divided into non-interca-lated wells and impermeable intercalated wells according to the nature of intercalation per-meability.In this study,firstly,a reasonable formula for predicting the time to see water is chosen,and the results show that the maximum error time between the predicted time to see water and the actual time to see water in wells in the non-intercalated well zone is 11.1 d,with a relative error of 5.6％.The maximum error time between the predicted water sighting and actual water sighting of wells in the impermeable intercalated well zone is 19.0 d,with a relative error of 7.2％.Moreover,the addition of artificial interbedding to inhibit the bottom-water coning in the uninterbedded well zone can delay the water sighting time of the wells in this well zone to different degrees.In this study,Eclipse numerical simulation software was used to optimize the optimal stratigraphic vertical permeability coefficient α.The results showed that the degree of recovery was 20.1％,which was 3.9％higher than that before the unoptimized.The integrated water content decreased by 4.7％,and the cumulative oil produc-tion increased by 250×103m3.Finally,in view of the impermeable interlayer water time can be affected by a variety of factors,this study uses orthogonal experimental design and combines the results of the R value of each factor can be seen in the largest extreme difference is the interlayer radius rb.According to the extreme difference in the order of the influence of the model prediction of the time to see the water parameter in descending order,the results of the ranking to get the optimal combination of the program,that is,the interlayer radius rb>in terlayer from the height of the interface between oil and water hb>the degree of openness of the wells b>the amount of production of qo.The program so that the prediction of the cumula-tive amount of production of 383×103m3(5％),and the degree of extraction increased by 4％.
bottom-water reservoirstime to see waterinterlayernumerical simulationor-thogonal experimental design
万方数据
维普
