一种估算气井合理产量的新方法

New method of estimating reasonable production of gas well

川西中浅层气藏是该地区的主力气藏，因常年的生产任务繁重，气井动态监测工作不能正常开展。各类试井资料严重匮乏。确定气井合理产量的资料依据不足。生产上往往直接按气井无阻流量的1／3—1／5进行配产，而生产实践表明，这种经验方法存在较大偏差，部分气井即使低于1／5无阻流量配产，仍然表现出井口压力下降快，稳产期短的问题。针对谊情况。基于计算单井控制储量的流动物质平衡法，提出一种估算单井合理产量的井口压降近似法。通过建立起气井井口压降速度与产量之间的近似函数关系。并利用大量实际井生产数据统计出的合理井口压降速度来反推气井的合理产量。检验与应用结果表明，该方法相对简便易行，且准确度较高，可作为该地区气井合理配产的参考依据。

The middle and shallow layers are the main reservoirs in western Sichuan. Due to the perennial heavy production task, the well testing works usually can＇t be implemented. Being short of well testing data makes the information of caculating the reasonable production of gas well be lack. In practice, 1/3 to 1/5 open-flow capacity is often used as the reasonable production. But it is showed that this experience method always has obvious error. Sometimes, the production is even lower than 1/5 open-flow capacity, the wellhead pressure still descends quickly and the stable production period is very short. For this situation, a new approximation method of estimating reasonable production of gas well is proposed, which is based on the flow material balance method used to calculate the well control reserves. Firstly, an approximation function relationship is established between the well headpressure descending rate and the gas production, then a statistic reasonable pressure descending rate from large numbers of producing data can be used to calculate the reasonable production. Testing and application results indicate that this method is relatively easy and precise, it can be used as the reference of production allocation.