Discussion About Positive or Negative Sign of Permeability Indexes in Non-Darcy Flow of Mudstone
Discussion About Positive or Negative Sign of Permeability Indexes in Non-Darcy Flow of Mudstone
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发表时间：
2007
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通讯作者：
Zhang Lian-ying
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作者：
Zhang Lian-ying
Forchheimer公式是研究非达西流时常用的经验关系式，一般认为非达西流β因子和加速系数都为正值，但在泥岩和泥质岩样的渗流试验中，却发现β因子为负值，甚至β因子和加速系数都为负值，这是怎么回事？这种测试现象是有价值的，还是测试方法不合理？针对这一问题，进行了泥岩和泥质岩的渗流特性试验，给出了试验结果，分析了β因子和加速系数均为负值的原因，并指出了一些研究者对非达西β因子前的正负号常犯的错误。
Forchheimer's formula is an experiential relation often used in the study of non-Darcy flow and it is generally agreed that both the non-Darcy-flow-β-factor and the acceleration coefficient are always positive.In the seepage test for mudstone and argillaceous rock specimen,however,we have found that the β-factor or even both the β-factor and the acceleration coefficient are negative.What's that all about? Is this test phenomenon valuable or is the test method unreasonable? Aiming at this problem,we have carried out an experiment on seepage properties for mudstone and argillaceous rock,showed the test result,and analyzed the reason why both the β-factor and the acceleration coefficient are negative.In addition,mistakes often made by some researchers about positive or negative signs before the non-Darcy β-factor were pointed out.