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在气藏开发过程中,由于产能测试资料有限,进行快速准确地评价单井产能难度大。而一点法只需要测试一个工作制度下的稳定产量和相对应的稳定流压,在大幅度减少测试工作量及测试周期的同时,可得到气井的产能方程。从二项式产能方程出发,推导了“一点法”产能方程的理论公式并进行了讨论,结合气藏地质特征,针对不同的无阻流量区间确定平均产能系数α,建立新的经验公式,结果表明所求产能方程更符合实际情况。
In the course of gas reservoir development, due to the limited capacity testing data, it is very difficult to evaluate single well productivity quickly and accurately. However, the one-point method only needs to test the stable output under a working system and the corresponding steady-state flow pressure, and the productivity equation of the gas well can be obtained while greatly reducing the testing workload and testing cycle. Based on the binomial productivity equation, the theoretical formula of the “one-point method” productivity equation is deduced and discussed. Combined with the geological characteristics of the gas reservoir, the average productivity coefficient α is determined for different unobstructed flow rates and a new empirical formula is established. The results show that the required capacity equation is more in line with the actual situation.