Pore structure and limit pressure of gas slippage effect in tight sandstone.
Pore structure and limit pressure of gas slippage effect in tight sandstone.
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DOI：
10.1155/2013/572140
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发表时间：
2013
影响因子：
--
通讯作者：
Kong L
中科院分区：
文献类型：
--
作者：
You L;Xue K;Kang Y;Liao Y;Kong L
气体滑移效应是气体在多孔介质中流动不同于液体流动的一个重要机理。一般认为，多孔介质的渗透率越低，气体流动的滑移效应越严重。根据气体滑脱效应的定义，针对致密砂岩储层不同的渗透率水平，设计并进行了增加岩心出口背压的实验。考察了致密砂岩中气体滑脱效应的极限压力，分析了毛细管压力曲线的特征参数。实验结果表明，当背压达到极限压力时，气体滑移效应可以消除。当反压超过极限压力时，测得的气体渗透率是一个相对稳定的值，对于给定的岩心样品，其范围小于3%。极限压力随渗透率的降低而增大，并与岩样的孔隙结构密切相关。研究结果对多孔介质中气体流动的相关性研究具有重要的指导意义，并有利于减少室内实验的工作量。
Gas slip effect is an important mechanism that the gas flow is different from liquid flow in porous media. It is generally considered that the lower the permeability in porous media is, the more severe slip effect of gas flow will be. We design and then carry out experiments with the increase of backpressure at the outlet of the core samples based on the definition of gas slip effect and in view of different levels of permeability of tight sandstone reservoir. This study inspects a limit pressure of the gas slip effect in tight sandstones and analyzes the characteristic parameter of capillary pressure curves. The experimental results indicate that gas slip effect can be eliminated when the backpressure reaches a limit pressure. When the backpressure exceeds the limit pressure, the measured gas permeability is a relatively stable value whose range is less than 3% for a given core sample. It is also found that the limit pressure increases with the decreasing in permeability and has close relation with pore structure of the core samples. The results have an important influence on correlation study on gas flow in porous medium, and are beneficial to reduce the workload of laboratory experiment.
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影响因子：
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DOI：
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影响因子：
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影响因子：
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