However, the main structure of plastic flexible packaging materials are plastic polymers, has some permeability to gas, and therefore can not fully replace the metal and glass packaging.
然而塑料软包装材料主体结构是塑料聚合物，对气体有一定的渗透性，因此并不能完全代替金属、玻璃包装。
Nitrogen gas with different displacing velocity and pressure was used to displace the core in testing, the permeability damage and correlation analysis caused by velocity sensitivity were obtained.
实验用氮气以不同的驱替速度和驱替压差驱替岩心，得到由速敏性引起的渗透率损害及相关分析结果。
One of the main methods to test the gas permeability is using partial pressure difference.
用压差法测试塑料薄膜的透气性，是一个长期使用的主流测试方法。
Jingbian Gasfield is a large gas field of low permeability and low abundance, encountering difficulty in its development due to special geological features.
靖边气田属于大面积、低丰度、低渗透气田，这种特殊的地质情况为气田的开发带来了一定的困难。
The obvious slippage effect for gas flow has been found due to the low gas permeability, and the effect of coal matrix shrinkage on the permeability is also indispensable.
低渗透气藏中的气体渗流具有明显的滑脱效应，同时煤基质收缩效应对煤层渗透率的影响也是不容忽视的。
There exist big differences in studied result with different test methods for dense reservoir rock in low permeability gas pool is sensitive to the stress.
致密低渗气藏开发过程中储集层存在应力敏感，不同的试验方法评价结果差异很大。
Methods of experiment, theory and calculation were used to establish a new nonlinear flow law. Experiment results of gas flow in low permeability pore-fissure media were analyzed.
采用实验、理论与计算相结合的方法建立低渗透孔隙-裂隙介质气体非线性渗流运动方程。
The porosity and permeability of coal-bearing strata have important influence to the exhaust and mining of coal bed gas, but the production of coal bed gas is precondition of its richen.
煤系地层孔隙性和渗透率对煤层气的抽放、排采具有重要影响，但煤层气的生成却是其富集的先决条件。
During mechanical longwall top coal mining, the gas permeability in top coal ahead of working face has bigger difference compared with slice mining due to the increase of mining height.
综放开采由于采高的加大，导致采场前方顶煤中瓦斯渗透性与分层开采有较大的差异。
This paper presents a new method of steady flow to solve the problem that the injection rate into cores is difficult to get steady, especially for gas in measuring relative permeability.
本文就用稳定法测量相对渗透率曲线中，存在的注入流量难以稳定的问题，提出了一种新的稳流方法。
Whether gas or liquid, radial or tangential, the permeability of Masson's pine wood is increasing from heartwood to sap wood.
马尾松木材的渗透性都是从心材向边材逐渐增大。
This test method has the advantages of simple on the operation and good of airproofness. It is believable and reasonable to use this method for assessing the gas permeability property of concrete.
实验证实，本方法具有操作简便、密封性能好、测试数据可靠的特点，以此方法来评价混凝土的气体渗透性能是合理可信的。
Liuhua 19-5 gas field belongs to high porosity and permeability reservoir, poor lithology, medium or not strong compaction.
流花19 - 5气藏按气藏分类标准为高孔高渗气藏，储层岩石成岩性较差，具有中等压实。
Using conventional deliverability testing way to productivity of low porosity and low permeability gas well, testing time is long and cost is high.
采用常规产能试井方式确定低孔低渗气井产能，其测试时间长、成本偏高。
So it become the key link solving the gas extraction in low-permeability coal beds to insure in coal mine security and enhance production efficiency.
因此，解决低渗透煤层的瓦斯抽放已成为确保煤矿安全生产，提高煤矿生产效率的关键环节。
The actual application of these models to some gas reservoirs with low porosity and permeability has proved their reliability and satisfaction in logging interpretation.
通过所建模型在某气田低孔隙度低渗透率储层测井解释中的实际应用，取得了满意的效果。
Most low permeability gas reservoirs belong to deformed media.
大部分低渗透气藏属于变形介质。
Thus, the traditional classic percolation mathematical model cannot to be better resolved the concrete problems of low permeability gas reservoirs.
因此仅靠使用传统意义上的经典渗流数学模型不能较好解决低渗透气藏的实际问题。
Essential way of solving the gas drainage problem of low permeability coal seam is to increase coal seam permeability.
解决低透气性煤层瓦斯抽放问题的根本途径是增加煤层的透气性。
The laboratory evaluation for protection oil-gas formation is conducted mainly with related instruments to monitor the permeability change of the core.
保护油气层的室内评价工作主要是借助于有关仪器，测定入井流体对油气层损害后的渗透率变化情况。
Application: Suitable designed for usage in fuel hose where resist to gasoline, diesel and alcohol-enhanced fuels. low gas permeability allowed the hose for other gas tight application.
使用合适的设计，使燃油管在输送汽油、柴油时减少了燃料损耗。降低了气体渗透性。允许软管输送其它气体。
Meanwhile, reverse imbibitions water blockage effect would be appeared to further damage the near the wellbore formation, especially in the low permeability and low productivity condensate gas Wells.
同时，在近井带还会形成反渗吸水锁效应，从而进一步加剧近井带地层伤害，对低渗低产凝析气井，这一现象尤为严重。
Due to deep reservoir bed, Anpeng Oilfield is a typical sand oil and gas reservoir with high temperature, high pressure, low porosity and poor permeability.
安棚油田储层埋藏深，属于典型的高温高压特低孔特低渗裂缝砂岩油气藏。
It further proves that the traditional Darcy formulae cannot be used to calculate the liquid influx during gas drilling of low-permeability formations.
进一步说明不能用传统的达西公式计算气体钻井中低渗透地层液体侵入量。
According to limitation of conventional deliverability testing method applied in gas reservoir of low permeability, a new, reduced well testing method for deliverability test is put forward.
针对常规产能试井方法在低渗透气藏中应用的局限性，提出了新的、简化的产能试井方法。
Hollow fiber membranes with good gas permeability can be obtained after the extraction of the paraffin oil and stretching to a small extension.
将石蜡油提取掉后稍加拉伸即可得到透气性很好的微孔中空纤维渗透膜。
When studying the conventional deliverability analysis of the tight gas reservoir, the tight gas reservoir will always need long test time to stabilize due to its low permeability.
对致密气藏进行常规产能分析时，由于渗透率极低，要达到稳定通常需要很长的测试时间。
After permeability development for gas, the burning front starts moving forward to the production Wells.
当储层中的气体渗透率提高后，燃烧前缘开始向生产井中运动。
The coal bed gas reservoirs in China are characterized by low permeability, low desorption speed, low production, rapid production decline and difficult to realize industrial scale production.
中国煤层气藏的特点是渗透率低，解吸速度低，产量低，产量递减快，工业化生产难。
The coal bed gas reservoirs in China are characterized by low permeability, low desorption speed, low production, rapid production decline and difficult to realize industrial scale production.
中国煤层气藏的特点是渗透率低，解吸速度低，产量低，产量递减快，工业化生产难。
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