焦石坝背斜中北部页岩气井压力变化规律研究

Research on Pressure Change Pattern of North Central Shale Gas Wells in Jiaoshiba Anticline

涪陵页岩气田焦石坝区块地质条件与北美国家存在较大差异,对其进行有效的人工改造使其成为具有经济效益的页岩气产层是个重大的课题。选取投产较早的典型井19口进行研究,发现各页岩气井的生产压力递减规律存在差异,并且井底流压测试资料表现出相同规律。从地质因素出发,进一步找出页岩气井压力递减规律的影响因素,为气藏管理及稳产措施时机等提供可靠依据,并且对涪陵页岩气田乃至整个四川盆地早古生界五峰组-龙马溪组页岩气的选区评价开发具有参考意义。

Jiaoshiba Block of Fuling Shale Gasfield is different greatly from North American countries in geological conditions.Its artificial modification to make it become shale gas producing pay with economic benefit is a great task.Through the research on earlier typical wells,this paper finds out that production pressure declining rules of shale gas wells are different,being the same with the rule displayed by downhole flow pressure test data.Starting from geological factor,this paper further determines the influence factor of declining rules to provide reliable evidence for gas reservoir management and stable production measure time,shedding light on evaluation and development of selected target area in Fuling shale gasfield and even Palaeozoic Wufeng Formation-Longmaxi Formation of all the Sichuan Basin.