基于水驱特征曲线的水驱气藏水侵量计算OA

In view of the complex calculation process of water influx in water drive gas reservoir,a new method is proposed to solve the water influx by establishing the relationship between water drive material balance equation and water drive characteristic curve.Firstly,the water drive characteristic curve of water flooding gas reservoir is derived from the gas water two-phase seepage law and formation fluid productivity equation,that is,the cumulative gas production after water breakthrough is linear with the natural logarithm of water gas ratio.The dynamic reserve of gas well after water breakthrough can be solved by slope,and the cumulative gas production before water breakthrough is taken as the total dynamic reserve.Secondly,according to the total dynamic reserves of gas wells,cumulative water production and high pressure physical properties of natural gas,the water invasion of water flooding gas reservoir can be calculated by substituting the water flooding material balance equation.The application results show that the method has high accuracy and practicability,and can provide basis for dynamic evaluation of water drive gas reservoir and selection of water control measures.