针对复杂地层金刚石钻头的改进与应用

Improvement and Application of Diamond Bit for Drilling in Complex Formation

摘要:

复杂地层的钻进与取样问题一直是钻探行业的一个技术难题。由于地层结构的杂乱无规律、软硬互夹层多、换层频繁以及破碎层硬、脆、碎的特性，使得在钻探施工过程中钻头寿命低下，频繁提下钻导致坍孔、掉块、缩径、漏失、涌水等事故经常发生，钻探效率难以提高。针对以上问题，根据目前钻探施工普遍采用的金刚石绳索取心钻探工艺，通过试验对金刚石钻头进行设计与改进，提高钻头的钻进效率与使用寿命，可大幅提高钻探效率并减少事故发生率，从而取得良好的经济效益。

Abstract:

There are lots of drilling and coring difficulties for exploration engineering in complex formations. The formation structure is usually unstable and broken with soft and hard layers interbedded, which makes the service life of drilling bit very short; and the accidents, such as hole collapse, block-falling, diameter shrinkage, leakage and water gushing, happen frequently, the drilling efficiency is hard to be improved. According to these problems, based on diamond wire-line coring drilling technology in current drilling engineering and by design improvement on diamond bit in tests, drilling efficiency and service life of drilling bit were both improved with drilling efficiency significantly increased and drilling accident reduced.