页岩气产量递减规律研究

页岩气藏的渗透率极低，储层流体流动性较差，气井产能较低，其产量递减规律有别于常规气藏。研究页岩气产量递减规律，对预测气田未来产量变化与最终开发指标及指导开发措施调整等均有重要意义。以美国德克萨斯州 Haynesville 与 Barnett 页岩气田单井生产动态为例，研究了层状硅质-钙质页岩与层状硅质页岩两大类页岩气田的产量递减规律，分析了复合递减模型以及广义双曲型曲线用于页岩气研究时参数发生的变化及其影响因素。通过 Arps 广义双曲递减法与复合递减模型法应用的对比表明，层状硅质-钙质页岩与层状硅质页岩两大类页岩气田产量变化规律有较大差异。

Production decline trend of shale gas

Shale gas reservoir has low permeability, in which fluid hardly flow and wells have smaller production capacity. The production decline trend of shale gas reservoir is largely different from conventional gas reservoir. The study on shale gas production decline trend is a reference to predict future production changes, development indices and indicators, subsequent adjustment of development measures. Based on Arps decline equation and generalized Weng’s model, a new model, compound decline model was proposed. Because the compound decline model has more general applicability rather than Arps decline equation, it was applied to shale gas production decline trend analysis in this paper for the first time. Then the changing parameters and influencing factors of compound decline model and Arps decline equation used on shale gas production were computed and analyzed. Comparing the compound decline model with the Arps decline equation in case of practical application in Haynesville shale and Barnett shale, it was tested and verified that there are great differences between the production decline trends of two categories of shale gas field.