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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...

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.

文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 5 5 %和 6 4 % ;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

Through analyzing the petrophysical prop erties, as pore type, porosity, permeability and water satu ration, etc, of T 3x 4 ( the fourth member of Xiangxi Group, Upper Triassic) reservoir in Chongxi region of Central Si chuan, it was indicated that this reservoir is of gas-producing ability. The full core productivity simulation test result showed that, when the producing pressure drop was 6 MPa, T 3x 4 gas reservoir might reach to the commercial production standard of 5 X 10 3m 3/d; and while the pressure...

Through analyzing the petrophysical prop erties, as pore type, porosity, permeability and water satu ration, etc, of T 3x 4 ( the fourth member of Xiangxi Group, Upper Triassic) reservoir in Chongxi region of Central Si chuan, it was indicated that this reservoir is of gas-producing ability. The full core productivity simulation test result showed that, when the producing pressure drop was 6 MPa, T 3x 4 gas reservoir might reach to the commercial production standard of 5 X 10 3m 3/d; and while the pressure drop in creased to 10 MPa, the single-well production was (25-30) X 10 3m 3/d. Therefore it is a low productivity gas reservoir. The dynamic damage simulation results indicated that the producing formation was damaged and the single-well pro duction lost about 25%-50%; the gas permeability was more than 0. 2 × 10 -3 μm 2 at the initial stage and less than 0. 05×10 -3 μm 2 at water-carried stage; and a little initial waterwas allowed to be produced with natural gas. The research results are basically identical with the testing data in this re gion.

研究了川中充西地区香四段储层的孔隙类型、孔隙度、渗透率、含水饱合度等特征 ,表明该层具有产气能力。岩心产能全模拟试验表明 ,当生产压差为 6MPa时 ,香四段气藏可达到 0 .5× 10 4m3 /d工业产气标准 ,当生产压差增至 10MPa时 ,单井产量可达到 (2 .5 3.0 )× 10 4m3 /d ,为一低产能气藏。动态损害模拟表明产层已受到损害 ,单井产量损害了 2 5 % 5 0 % ;开井生产初期气相渗透率大于 0 .2× 10 -3 μm2 ,产水时气相渗透率小于 0 .0 5× 10 -3μm2 ,生产中可产出少量原生水 ,研究结果与该区测试资料基本吻合。

 
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