涪陵页岩气田气井地层压力计算方法研究

Research on Calculation Method of Reservoir Pressure of Gas Wells in Fuling Shale Gas Field

涪陵页岩气田焦石坝区块页岩气井目的层位于五峰组-龙马溪组,相比常规气井,生产过程更加复杂。随着开发时间不断延长,气藏压力下降,进而造成气藏合理开发工作制度的改变。如何求准地层压力,制定页岩气井全生命周期合理生产制度,提升单井EUR,是页岩气藏开发亟需解决的问题。通过研究发现:套压迭代法、物质平衡法、环空测液面资料+套压迭代法能够准确预测页岩气井地层压力,相对误差在5%以内。

The target layers of shale gas wells in the Jiaoshiba block of the Fuling Shale Gas Field are the Wufeng-Longmaxi Formation.In comparison to conventional gas wells,the production process is more complex.As development progresses and reservoir pressure declines,necessitating changes to the development working regime,it becomes crucial to accurately determination of formation pressure for shale gas wells and enhance the Estimated Ultimate Recovery(EUR)per well.This study explores the use of the casing pressure iteration method,material balance method,and annular liquid level data combined with the casing pressure iteration method to accurately predict formation pressure in shale gas wells,with a relative error within 5%.