Study On The Potential Of Partial Encryption In S Oilfield

Our country sea area is rich in hydrocarbon resources.At present,the terrestrial oil and gas production shows a declining trend,and the country's oil demand has steadily increased.The continuous increase in offshore field production has become an important part of the country's oil production growth and output replacement.Therefore,this article studies the offshore S field,the technology of reservoir engineering and numerical simulation is used to define the secondary local refinement potential of the S Oilfield,and finally the local layer system subdivision and well pattern adjustment plan are obtained.Firstly,the Single index and comprehensive index of S Oilfield is evaluated by selecting eight evaluation indexes,and they include recovery rate,water drive reserve control degree,water drive reserve production degree,water cut rise rate,decline rate,stage water storage rate,stage water drive index and formation pressure maintenance level.Through evaluating the S Oilfield,the evaluation result is A class of oilfield.The overall development effect is good,but the part area still has the potential to further improve oil recovery.Based on reservoir engineering and numerical simulation technology,a new method of reservoir numerical model fitting is obtained.Before the completion of historical fitting,the relationship curve between the recovery degree and water content of the calculated value and the actual value is quite different.Based on reservoir engineering theory,it is proved that there is a functional relationship between the slope and intercept of K_ro/K_rw?S_w relation curve and water oil ratio?recovery degree relation curve.According to the water oil ratio?recovery degree curve calculated from the actual data of the oilfield,the displacement distance of the relative permeability curve is determined,and the modified relative permeability curve is obtained by inversion.The same development effect of the calculated value and the actual value of the oil field can be obtained by numerical simulation calculation using the relative permeability again,and realize the history matching fastly.This method is used to verify the actual well group model of S Oilfield,and the fitting accuracy is 96.84%,which is good.In order to find the secondary potential of part infilling of S Oilfield after overall infilling,a new method of reservoir numerical model fitting is used to fit the history of s Oilfield with eclipse numerical simulation software,and then predict the remaining oil.In order to highlight the shortcomings of the current well pattern and determine a reasonable part well pattern infilling location,the model is predicted to June 2041 based on the current development system.Through the calculation of stage recovery degree and remaining oil saturation and comparative analysis,two part infilling potential areas S1 and S2 are obtained.Through sorting out and selecting geological reservoir data in potential area,and based on reservoir engineering,numerical simulation and physical simulation,we can obtain effective thickness limit of single well,permeability differential limit and span limit of production well section.Thus,they can provide theoretical basis for subdivision of strata in potential area.Through the methods of production rate,well pattern density and economic limit well spacing,the well spacing limit of potential area is further optimized,which lays a theoretical foundation for secondary local infilling of S Oilfield.According to the adjustment limit of well pattern and strata,five development plans are designed by combining different strata and well pattern.We can get through prediction.The best development plan of S1 potential area is that the oil formation of I_u and I_d are divided into a set of strata.Based on the original wells,a well pattern with two rows of oil wells adjacent to one water well and a well spacing of 175 meters is constructed.The?oil formation is a set of strata.The well pattern of the combination of one row well of inter injection production,one row of production wells and one row of water injection wells with a well spacing of 175 meters is constructed.The cumulative oil increase is 343.92×10⁴m³,and the single well oil increase is 9.05×10⁴m³.The best development plan of S2 potential area is to take I_u oil formation as a set of strata.On the basis of the original wells,transfer some of the original production wells,and build a pattern the combination of inter injection production,one production well and one injection well.The I_d and II oil formations are a set of strata.It can be constructed a pattern of two rows of oil wells adjacent to one row of water wells with a spacing of 175 meters.The cumulative oil increase is 495.2×10⁴m³,and the single well oil increase is 12.38×10⁴m³.