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气井单井控制储量的确定在气藏的开发过程中占有重要地位,而低渗透气藏的渗流特点是非达西流动,即存在启动压力。以往计算单井控制储量的方法均未考虑启动压力梯度的影响。但是在现场实际运用中,常常需要考虑启动压力梯度,因而提出了在低速非达西流动情况下,考虑启动压力梯度时的单井控制储量的确定方法。从基本数学模型出发,推导出了相应公式。利用该公式对某井进行了单井控制储量的计算,并且同用常规动态方法计算的单井控制储量相比较,证明所提出的方法是实用有效的。
The determination of single well control reserves in gas wells plays an important role in the development of gas reservoirs, whereas the seepage characteristics of low permeability gas reservoirs are non-Darcy flow, that is, the starting pressure exists. In the past, the method of calculating single well control reserves did not consider the influence of starting pressure gradient. However, it is often necessary to consider the starting pressure gradient in practical application. Therefore, a method to determine single well control reserves when starting pressure gradient is proposed under low-velocity non-Darcy flow conditions. Starting from the basic mathematical model, the corresponding formula is deduced. Using this formula to calculate the single well control reserves of a well, and compared with the single well control reserves calculated by the conventional dynamic method, the proposed method is proved to be practical and effective.