组合切削具产生的预破碎区对钻进效果的影响

Influence of Pre-break Zone Generated by the Combination of Cutting Tools to Drilling Effect

摘要:

从组合切削具将在岩石中产生预破碎区的论点出发，通过实验定量研究了预破碎区深度与掏槽刃切入深度的关系，得出了预破碎区有利于降低岩石强度及岩石破碎能耗的结论，并用生产试验结果进行了验证。提出了孕镶金刚石钻头钻进Ⅶ~Ⅷ级硬岩时仍存在预破碎区和切削、微切削破岩方式，以及预破碎区并非越大越好的学术观点。

Abstract:

Based on the view that the combination of cutting tools can produce pre-break zone in rock, this paper quantitatively studies the relationship between the depth of pre-break zone and the cut depth of cutting edge. The results show that the pre-break zone can contribute to reduce rock strength and rock fragmentation energy, which is also verified by the field test results. It gets the following two academic views: there are still pre-break zone, cutting and micro-cutting rock breaking modes when drilling Ⅶ~Ⅷ-class hard rock with the impregnated diamond bit; the view “the bigger of pre-break zone, the better of drilling effect” is not correct.