计算水驱气藏水侵量及动态地质储量的集成方法

Integrated method for calculating water influx and dynamic geological reserves in water-drive gas reservoirs

气藏动态地质储量及水侵量是水驱气藏开发设计的重要参数,目前常使用气藏物质平衡法进行计算,但是运用常规物质平衡法计算水驱气藏水侵量和动态地质储量时,由于人工选取回归点、识别图版等过程会产生较大误差,常出现不同方法地质储量及水侵量计算结果不同的情况。针对以上问题,对水侵量计算物质平衡法中的差值法、图版法、视地质储量法进行分析,建立3种方法之间的约束条件,形成新的计算方法,并进行实例计算。通过实例分析了常规物质平衡法误差来源,并验证新方法,计算结果表明新方法具有较好的实用性和可靠性,可以推广运用到有水气藏动态储量及水侵量的计算。

When calculating the water influx and geological reserves of the water-drive gas reservoir by using the material balance method,large errors will occur due to artificial selection of the regression points and the identification of the chart,and of ten results in different calculation results of geological reserves and water influx by different methods.In view of the above problems,this paper analyzes the difference method,chart method and apparent geologic reserves method in the material balance method of water influx calculation,establishes the constraint conditions between the three methods,forms a new calculation method and carries out the example calculation.The error sources of conventional material balance method have been calculated and analyzed by examples,and the new method has been verified.The calculation results show that the new method has good practicability and reliability,which can be applied to the calculation of geological reserves and water influx of water-drive gas reservoirs.