破碎地层取心钻具研究现状及展望

Research status and prospects of coring tools for broken formation

摘要:

数十年来，国内外专家学者针对破碎地层取心技术做了大量的研究，在提高岩心采取率、增加回次进尺、降低进心阻力、提高机械钻速等方面取得了显著成效。但针对破碎地层岩心频繁卡堵的解决方法研究相对较少，虽然以JamBuster为代表的解堵取心工具，通过增加衬管的方法在一定程度上缓解了岩心卡堵情况、增加了回次进尺，但仍未从根本上解决卡堵问题。本文总结了近年来国内外针对破碎地层取心的研发现状，分析了其中存在的不足，提出了几点发展完善建议。

Abstract:

Experts and scholars at home and abroad have conducted lots of research on coring in broken formation for many decades, leading to notable resultsin terms of decreasing core entry resistance, increasing core recovery, extending footage per run, increasing ROP, etc. However, less research has been made on solutions to core jamming incidents. To some extent the jam-releasing coring tools represented by JamBuster alleviated the core plugging problem, and extended the footage per round by adding liners, but the problem of core jamming hasn’t been fundamentally solved. This paper summarizes the research state of the special coring tools and technologies for broken formations in the past, analyses their shortcomings, and puts forward some suggestions for improvement.