Calculation method for reasonable oil-water well ratio in the edge water drive offshore sandstone oilfield
Based on the calculation formulas for reasonable oil-water well ratio and reasonable formation pressure in oil fields considering the influence of edge water energy were derived through material balance and extreme value principles.This method was applied to reservoir A,which is developed in Neogene the Pearl River Forma-tion of the Pearl River Mouth Basin.Meanwhile,the variation law of reasonable oil-water well ratio with water content in edge water reservoirs has been analyzed through the new method.The results show that:(1)Compare with natural energy supplementation,the new method can determine the reasonable oil-water well ratio for different water content stages of edge water reservoirs and the calculation results are closer to field practice.(2)The reasonable ratio of oil-water wells is subject to the comprehensive influence of multiple factors.The coefficient of edge water invasion has the most significant impact on it.The larger water invasion coefficient,the greater the calculation error of traditional methods.(3)To meet the conditions of high liquid yield and high utilization of natural energy,the current reasonable oil-water well ratio was 1.97 for reservoir A of the Pearl River Mouth Basin.Under this condition,the daily water injection volume was 18 878 m3/d.The natural water influx was 1 693 m3/d.The formation pressure was 21.27 MPa.The calculation results were similar to the numerical simulation results.
edge-water drive reservoirsmaterial balancereasonable ratio of production and injection wellsreasonable pressureinjection-production ratioinvasion coefficientnumerical simulationneogenePearl River Mouth Basin
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