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考虑动水压力梯度的自由水面计算 被引量:3
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作者 陈雄波 唐洪武 杨丽丰 《水动力学研究与进展(A辑)》 CSCD 北大核心 2005年第6期802-808,共7页
本文首先指出了两种常用计算自由水面方法存在的不足,提出在构造标高函数求解水位方程时,应考虑沿水深平均的动水压力梯度的影响,并说明了具体的计算步骤,推导出一种简便的计算近底平均流速的关系式,最后通过两个计算实例表明:引入动水... 本文首先指出了两种常用计算自由水面方法存在的不足,提出在构造标高函数求解水位方程时,应考虑沿水深平均的动水压力梯度的影响,并说明了具体的计算步骤,推导出一种简便的计算近底平均流速的关系式,最后通过两个计算实例表明:引入动水压力梯度后,数值计算结果与实测值更为接近。 展开更多
关键词 三维流数学模型 自由 动水压力梯度 近底平均流速
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考虑束缚水时变的致密气藏数值模拟研究 被引量:4
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作者 张旭 姜瑞忠 +2 位作者 崔永正 杨志兴 陈自立 《中国海上油气》 CAS CSCD 北大核心 2017年第5期82-89,共8页
从气相启动压力梯度的物理概念和物模实验角度分析认为,气体通过高束缚水低渗致密岩心时的"阈压效应"实质为气水相间渗流阻力的宏观反映,毛管压力曲线与时变的气水相渗曲线足以定量描述该现象,不应引入气相启动压力梯度。建... 从气相启动压力梯度的物理概念和物模实验角度分析认为,气体通过高束缚水低渗致密岩心时的"阈压效应"实质为气水相间渗流阻力的宏观反映,毛管压力曲线与时变的气水相渗曲线足以定量描述该现象,不应引入气相启动压力梯度。建立了考虑气水相渗时变、储层应力敏感及可动水启动压力梯度的致密气渗流数学模型,用全隐式有限差分方法求解,并编制了数值模拟器。对新模拟器进行了退化测试,并利用新模拟器研究了特殊渗流机理对致密气藏开发的影响及气水相渗时变对实际区块的影响,结果表明:不考虑特殊渗流机理时,新模拟器与Eclipse软件计算结果具有很好的一致性;气水相渗时变会增大气井产水量、减少稳产气时间;可动水启动压力梯度会减少日产水量、增加稳产气时间;储层应力敏感会降低日产水量、提早进入递减期;束缚水的运移是气井产水重要原因之一,考虑气水相渗时变更能反映实际气井生产动态。 展开更多
关键词 致密气 高束缚 相渗时变 储层应力敏感 压力梯度 数学模型 模拟器
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Drainage feature about coalbed methane wells in different hydrogeological conditions in Fanzhuang area 被引量:1
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作者 NI Xiao-ming LIN Ran WANG Yan-bin 《Journal of Coal Science & Engineering(China)》 2012年第4期344-349,共6页
It is an important guarantee to enhance the production of coalbed methane (CBM) and reduce the project invest- ment by finding out the drainage feature about CBM wells in different hydrogeological conditions. Based ... It is an important guarantee to enhance the production of coalbed methane (CBM) and reduce the project invest- ment by finding out the drainage feature about CBM wells in different hydrogeological conditions. Based on the CBM explora- tion and development data on the Fanzhuang block in southeast Qinshui Basin and combined with the seepage principle and lithology on the roof and the bottom coalbed, the mathematical model of integrated permeability was established. By perme- ability experiments of the different lithologies on the roof and the floor within the 20 m range combined with the log curves, the integrated permeability of different lithological combinations were obtained. The starting pressure gradient and permeabi- lity of the roof and the floor for different lithologies was tested by "differential pressure-flow method". The relationships be- tween the starting pressure gradient and the integrated permeability were obtained. The critical distance of limestone water penetrating into coal reservoirs was calculated. According to the drainage feature of CBM wells combined with the drainage data of some CBM wells, the results show that, when limestone water can penetrate into coal reservoirs, the daily water production is high and the daily gas production is low although there is no gas at the beginning of the drainage process, the CBM wells stop discharging water within 6 months after the gas began to come out, and the gas production is steadily improved. When limestone water can not penetrate into coal reservoirs, the daily water production is low and the daily gas production is high at the beginning of the drainage process, and it almost stops discharging water after some time when the gas come out, the daily gas production increases, and the cumulative water production is much lower. 展开更多
关键词 coalbed methane hydrogeologicalv condition drainage feature water production Fanzhuang area
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