孕镶金刚石钻头高转速钻进磨损失效与规程参数研究现状

Research status of wear failure and drilling parameters parameters of impregnated diamond bit in high speed drilling

孕镶金刚石钻头高速回转钻进是深地硬岩取心钻进的主要方法之一,虽然其广泛应用于各个领域,但仍存在钻进性能不稳定、钻头磨损异常等问题,原因在于对钻头-岩石界面规律及动态磨损过程的认知仍然不够清晰。本文综述了目前对孕镶金刚石钻头碎岩力学响应模型的研究现状,总结了钻头磨损机制在不同钻进规程参数下与碎岩方式和钻进速度间的关系,孕镶金刚石钻头磨损失效机制可以概括为钻头-岩石界面二体磨损和三体磨损的循环过程。介绍了国内外学者对超过常规转速区间下临界钻进规程的研究,新规程的探索对孕镶金刚石钻头高速钻进的发展具有重要意义。

High‑speed rotary drilling with diamond‑impregnated bit is one of the main methods of deep hard rock core drilling.Although it is widely used in various fields,it still has some problems,such as unstable drilling performance and abnormal bit wear.The reason is that the understanding of the law of bit/rock interface and dynamic wear process is still not clear.In this paper,the current research status of mechanical response models of diamond‑impregnated bits for rock breaking is reviewed,and the relationship between the bit wear mechanism and the rock breaking mode and drilling speed under different drilling parameters is summarized.The wear failure mechanism of diamond‑impregnated bits can be summarized as the cycle process of two‑body wear and three‑body wear at the bit/rock interface.This paper introduces the research of the critical drilling procedure in the interval beyond the conventional speed.The exploration of the new procedure is of great significance to the development of the high speed drilling of diamond‑impregnated bit.