A Method to Calculate Gas Well Controlled Reserves and Water Influx from Production Data
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摘要: 为了解决水侵量计算较为复杂的问题,根据存水体积系数的物理意义,将存水体积系数用当前气藏含水饱和度与初始含水饱和度的差值来表示,推导了计算气井控制储量和水侵量的公式。利用该公式计算了某水驱气藏3口气井的控制储量和水侵量,结果表明,计算精度与其他常用计算方法相当。利用该公式还计算了该气藏某口气井不同时刻的含水饱和度、单井控制储量及水侵量,结果表明,在一定采出程度条件下,随着气井生产时间的延长,气藏的含水饱和度升高,气井的控制储量和水侵量增大。气井的控制储量与地层压力差、含水饱和度均呈线性关系;水侵量与地层压力差呈线性关系,与气藏含水饱和度呈指数关系。由于该计算方法中求取含水饱和度时要用稳定的生产数据,因此,该计算方法仅适用于生产时间较长的气井。Abstract: To avoid complex water influx calculations, a new formula was derived to calculate gas well controlled reserves and water influx based on water storage volume coefficient which was expressed by the gap between current water saturation and initial water saturation of the gas reservoir.Using the new formula, the controlled reserves and water influx of three wells in a water driven gas reservoir were calculated.The results showed that this method provided a precision equivalent to other methods.Moreover, the formula was used to calculate water saturation, single well controlled reserves and water influx of a well in such reservoir at different times, which indicated recovery degree, water saturation of gas reservoir increased and gas well controlled reserves and water influx increased over the well production time.The well controlled reserves had a linear relation to formation pressure difference or water saturation, while water influx had a linear relation to the formation pressure difference and an exponential relation to the water saturation.This method requires steady production data to calculate the water saturation, so it is only suitable for the gas wells that have been produced for some time.
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