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章通过模拟地层上覆压力、地层压力、地层温度和地层原始含水饱和度以及无边、底水定容气藏的弹性气驱降压开采的全模拟试验,对川西蓬莱镇组气藏在废弃压力时的天然气采收率进行了模拟研究,得出如下结论：蓬1和蓬2气藏采收率分别为55％和64％;气藏采收率与渗透率呈正相关关系,水饱和度与孔隙度呈负相关关系;提高气藏在废弃压力时采收率的关键是控制生产压差,避免大量天然气进入尾气生产阶段产出。

Simulation Experimental Research on the Recovery Factor of Penglaizhen Formation Gas Reservoir in West Sichuan

Through an overall simulation experiment of th e overburden pressure,formation pressure,formation temperature and initial formati on water saturation as well as the pressure fall off production of elastic gas drive constant volume gas reservoir without edge water and bottom water,the gas recovery factor at abandonment pressure was studied for the Penglaizhen Formatio n gas reservoirs in West Sichuan.It is concluded that the recovery factors are 5 5% and 64% for J 3 p 1 and J 3 p 2 gas reservoirs respectively;res ervoir recovery efficiency is positively correlated with permeability and water saturation is negatively correlated with porosity;and the key to enhance reservo ir recovery factor at the abandonment pressure is to control producing pressure drop,so as to avoid a lot of gas' being produced in end gas production stage.