中文摘要：

首次将机械密封理论运用于气井微间隙封堵液封堵机理研究中,解释了微间隙内封堵液成堵机理,建立一界面微间隙封堵液的封堵物理模型,得到封堵液上升高度计算公式。对不同微间隙宽度与压力下封堵液上升高度进行了计算分析,在此基础上讨论了封堵液的封堵效果。分析结果表明,当微间隙宽度小于12μm时,封堵液的封堵效果较好。研究内容不仅丰富了气井微间隙封堵液封堵机理的研究,也为从根本上解决环空气窜问题提供了理论指导。

英文摘要：

The theory of mechanical seals was firstly used in the study on liquid sealing mechanism of Gas Well micro-gap.The sealing mechanism of liquid in micro-gap was explained.The seal physical model on sealing liquid in micro-gap of the cementing first interface was established.And the computing formula of lifting height for sealing liquid was obtained.The lifting height with different micro-gap size and different pressure for sealing liquid was calculated and analyzed,based on these,the seal effect for sealing liquid was discussed.Analysis results show that the seal effect is better when micro-gap size less than 12 μm.The study on seal mechanism of the liquid sealing in gas well micro-gap not only enriches,but also provides a theoretical guidance fundamentally solution to the issue of gas channeling in annulus.