涪陵页岩气田常压气藏试气返排规律

Flowback features of a gas test in normal-pressure gas reservoirs in Fuling shale gas field

涪陵页岩气田白涛、白马区块属于常压页岩气藏(压力系数0.85~1.11),页岩品质与焦石坝区块等高压气藏相近,含气性稍差,但试气及试采特征存在显著差异。通过分析白涛、白马区块多口常压页岩气井试气阶段的产气、返排及压力数据,摸索常压页岩气井试气特征规律,为更准确的评价气井产能和制定试采制度提供依据。

Baitao and Baima blocks of Fuling shale gas field belong to normal-pressure shale gas reservoirs(pressure coefficient 0.85~1.11).The shale quality is similar to that of high-pressure gas reservoirs such as Jiaoshiba block with slightly poor gas content,but there are significant differences in gas tests and production characteristics.By analyzing the gas production,flowback and pressure data of multiple normal-pressure shale gas wells during gas testing in Baitao and Baima blocks,the paper investigates their gas test characteristics,which provides a basis for more accurate evaluation of gas well deliverability and development of a production test regime.