不同含水饱和度低渗透岩石气体滑脱效应研究
发布时间:2018-03-21 17:02
本文选题:低渗透岩石 切入点:克林伯格公式 出处:《岩土工程学报》2017年12期 论文类型:期刊论文
【摘要】:低渗透岩石气体滑脱效应的研究是油气开采与存储领域十分重要的内容,但目前关于低渗透岩石气体滑脱效应的研究大多是在气体单相流下进行的,对于气 液两相流时,液体对气体滑脱效应的影响,所做的研究不足。因此,利用研发的低渗透岩石惰性气体渗透性测试系统,对含水饱和度为0~70%的低渗透砂岩,进行了不同含水饱和度的低渗透岩石气体滑脱效应及有效渗透率变化规律的研究,试验结果表明:(1)二次公式k_g=k_∞(1+b/q-a/p~2)可以较为准确的解释低渗透岩石的气体滑脱效应,准确性明显高于Klinkenberg公式。(2)含水饱和度对低渗透岩石的气体滑脱效应有明显影响,气体滑脱效应随着含水饱和度增大而减少,在含水饱和度超过50%时,气体滑脱效应几乎完全被限制。(3)由于水的作用,含水的低渗透岩石随着围压增大,气体滑脱效应减少,这与克氏理论的结论相反。(4)含水饱和度对低渗透岩石的有效渗透率影响显著,随含水饱和度的增大有效渗透率减少,且围压越大,低渗透岩石的有效渗透率对含水饱和度变化越敏感。(5)低渗透岩石的有效渗透率与含水饱和度符合幂函数关系,即k_∞=k_0(1-S_w)~c。
[Abstract]:The study of gas slippage effect in low permeability rock is very important in the field of oil and gas extraction and storage. However, at present, most of the researches on gas slip effect of low permeability rock are carried out under single phase gas flow, and for gas / liquid two phase flow, The effect of liquid on gas slippage is not well studied. Therefore, using the developed low permeability rock inert gas permeability test system, a low permeability sandstone with water saturation of 0% or 70% is studied. The gas slippage effect and effective permeability variation law of low permeability rock with different water saturation are studied. The experimental results show that the gas slippage effect of low permeability rock can be explained more accurately by the quadratic formula KG / K _ 鈭,
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