海洋自适应伸缩绳索取心钻探工艺研究及应用

Research and application of ocean adaptive telescopic rope core drilling technology

摘要:

海洋取心钻探钻遇软硬交互地层时，往往采取提钻更换相匹配的取心钻具来应对不同硬度的地层。海上作业成本高，频繁起下更换钻具耗费时间长，面对软硬交互地层工况，研发了自适应伸缩绳索取心钻探工艺。钻遇绵软地层时，内管超前伸出，由内管安装的钻头进行取心钻进；钻遇坚硬地层时，内管在地层对钻压的反力下会压缩其内部的弹簧从而回缩到钻具外总成当中，由外总成钻头进行取心钻进，在压缩弹簧的调解下，可根据地层硬度的变化自动调整取心钻进方式。通过工程应用检测，使用该工艺平均岩心采取率高，达到了保证取心质量、延长内管钻头工作寿命的目的，提高了作业效率和安全性，为海洋工程勘察提供了借鉴。

Abstract:

When marine coring drilling encounters soft hard interaction formations， it is often necessary to lift the drill and replace it with a matching coring tool to cope with formations of different hardness. The cost of offshore operations is high， and frequent replacement of drilling tools takes a long time. Faced with the interaction of soft and hard geological conditions， an adaptive telescopic rope coring drilling technology has been designed. When encountering soft formations during drilling， the inner pipe extends ahead and the drill bit installed on the inner pipe performs coring drilling； When encountering hard formations， the inner tube will compress its internal spring under the reaction force of the formation on the drilling pressure， and then retract into the outer assembly of the drilling tool. The core drilling is carried out by the outer assembly drill bit， and under the adjustment of the compression spring， the core drilling method can be automatically adjusted according to the change in formation hardness. Through engineering application testing， the average core recovery rate of this process is high， achieving the goal of ensuring core quality and extending the working life of the inner pipe drill bit， improving operational efficiency and safety， and providing certain reference significance for marine engineering investigation.