A new calculation method of water sweep efficiency in water drive reservoir
The water sweep efficiency is important parameters in oilfield development,but there are many problems in the calculation method,such as complicated operation,low precision and poor practicability,the calculation method of water sweep efficiency based on the water drive curve is not clear about the concept of the oil displacement efficiency and the water saturation,which makes the result of the derivation not rigorous.So it is necessary to establish a simple and accurate analytical solution method.Based on fractional flow equation and welge equation,a calculation method of water sweep efficiency based on relative permeability curve is proposed,which can be used to calculate water sweep efficiency in different oilfield development stages based on production data.The X oilfield calculation shows that for the south china sea marine sandstone oil field with abundant side water,the oil production is mainly from the water flooding region expansion in the initial oilfield developed period and then change to enhance oil displacement efficiency as the water sweep efficiency is to be stable,so the development policy of this oilfield should be to perfect production patterns nets in the initial oilfield developed period,then be to installe larger pumps and increase liquid production in the middle-later developed period.The proposed method is featured with accessible date,convenient calculation,showing a broad application prospect in dynamic analysis and development effect evaluation of oilfield.
water flooding reservoirmarine sandstone reservoirwater saturationwater sweep efficiencyoil displacement efficiency
NETL
NSTL
万方数据
