深孔复杂地层绳索取心钻具优化设计思路

采用绳索取心钻进技术在深孔复杂地层钻进时，易出现内管钻具打捞失败、岩心卡断失效及岩心易冲蚀等问题。本文从实际问题出发，结合国内外绳索取心钻具的发展现状，给出了钻具结构的优化设计思路，包括岩心管涂层减阻及振动解堵、弹卡机构防顶死设计、增加卡簧与岩心之间摩擦力、增大钻具内部过流面积、改变钻头处冲洗液流向等，以进一步提高绳索取心钻具在深孔中的钻进效率。

Optimum Design Thoughts of Wire-line Coring Tool Used for Deep Hole Drilling in Complex Formation

For deep hole drilling in complex formation, failure of inner tube drilling tools fishing, failure of core breaking, core erosion and so on are easy to happen in using wire-line coring drilling technology. Combined with the development status of wire-line coring tool both in China and abroad and starting from the practical problems, the optimum design thoughts of drilling tool structure are given including coating drag reduction and vibratory plugging removal of core barrel, anti-jacking design of latch mechanism, friction increase between core lifter and core, increase of the flowing area inside the drilling tool, change of the flushing fluid flowing direction near the bit and so on in this paper in order to further improve the drilling efficiency of the wire-line coring tool in deep hole drilling.