页岩气产量递减典型曲线应用分析

Application and analysis of yield decline type curve of shale gas

在页岩气井生产数据基础上,对典型曲线进行研究,分析了拟合方法、初始产量确定方法、生产历史长短以及压裂级数等对典型曲线的影响。结果表明,以日产量为基础计算典型曲线应采用自动拟合法确定初始产量。生产历史长短对最终可采储量(EUR)具有很大影响,因此,应尽量选择生产历史长的井作为研究对象。要充分考虑压裂级数影响,在一个井场(Pad)中各井压裂级数相差不大时,采用单井生产数据和单级压裂生产数据所得结果是一致的。但当一个pad内各井压裂级数相差较大时,应采用单级压裂生产数据作为产量递减典型曲线分析数据,所得结果更能反映典型井生产特征。

Research in the type curve base on the production data of shale gas well , the effects of fitting method, determination method of initial prodution, length of production history and fracturing stages on the yield decline type curve of shale gas were analysed. The results showed that it was better using automatic fitting method to determine the initial production when the production data was supplied by per day. The length of production history has large influence on the expected ultimate reserve （EUR）, therefore, the well with longer enough production history should be best chosen. When the fracturing stages of different wells in the same pad were similar, the type curves derived from the production data of the whole well and the single fracture stage were nearly the same. However, When the fracturing stages of different wells in the same pad had larger difference, the production data of the single fracture stage should be used to determine the type curve, its result could reflect production character of the well better.