Impregnated diamond bits (IDBs) are widely used for drilling in hard formations. To improve the drilling efficiency and exposure behavior of IDBs in granite, three types of Cu-based basalt fiber (BF) composite IDBs were designed and prepared by using the medium-frequency induction hot-pressing and sintering method, in which 0 wt% BF and 25 vol% diamond were used in 0BF25D IDB, 1 wt% BF and 25 vol% diamond were used in 1BF25D IDB, 1 wt% BF and 20 vol% diamond were used in 1BF20D IDB. The drilling efficiency of each IDB was tested under different drilling pressures (WOB), and the exposure behavior of IDBs was investigated by scanning electron microscopy and ultra field microstructural characterization. Results show that drilling granite with grade 9 drillability, low drilling pressure can drill successfully with the addition of BF. The average rate of penetration (ROP) of 1BF20D IBD under 6 kN WOB was 4.78 m/h, which was improved by 60 %∼80 %, energy consumption decreased by 66 % for each meter, torque (TOB) decreased, and rotational speed (RPM) was more stable during the drilling process. The addition of BF and reasonable diamond concentration enhanced the holding power of the diamond which promoted the exposure of the diamond. The average exposed height of the diamond in 1BF20D IDB reached 121.2 μm with 22 %–29 % of the whole diamond.

中文翻译：

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玄武岩纤维复合浸渍金刚石钻头在硬质花岗岩中的暴露行为及钻孔效率


浸渍金刚石钻头 （IDB） 广泛用于在硬地层中钻孔。为提高 IDBs 在花岗岩中的钻孔效率和暴露行为，采用中频感应热压烧结法设计制备了 3 种类型的铜基玄武岩纤维 （BF） 复合材料 IDBs，其中 0BF25D IDB 中使用了 0 wt% BF 和 25 vol% 金刚石，1BF25D IDB 中使用了 1 wt% BF 和 25 vol% 金刚石， 1BF20D IDB 中使用了 1 wt% BF 和 20 vol% 金刚石。在不同钻孔压力 （WOB） 下测试了每个 IDB 的钻孔效率，并通过扫描电子显微镜和超场微观结构表征研究了 IDBs 的暴露行为。结果表明，在添加 BF 的情况下，钻探具有 9 级可钻性、低钻孔压力的花岗岩可以成功钻探。1BF20D IBD 在 6 kN WOB 下的平均钻进速度 （ROP） 为 4.78 m/h，提高了 60 %∼80 %，每米能耗降低了 66 %，扭矩 （TOB） 降低，转速 （RPM） 在钻孔过程中更加稳定。BF 的添加和合理的金刚石浓度增强了金刚石的保持力，从而促进了金刚石的曝光。1BF20D IDB 中钻石的平均暴露高度达到 121.2 μm，占整个钻石的 22 %–29 %。