坚硬致密岩层钻进用热压金刚石钻头的研究

针对坚硬致密岩石钻进中遇到的钻头打滑、钻进效率低的问题，通过改变弱包镶材料，加入强化的石墨颗粒，进行试验与研究，获得了颗粒状石墨能提高金刚石出刃的初步效果。随后对石墨颗粒的粒度和强化程度进行反复试验，得到石墨颗粒的粒度、含量和强化程度对金刚石出刃的影响关系；在此基础上研制成新型的热压金刚石钻头，生产试验表明能明显提高金刚石钻头的出刃效果，达到了提高钻进效果的目的。

Research on Hot-pressing Diamond Bits for Drilling in Hard and Compact Rocks

The most difficult problem of drilling in hard and compact rocks is that drilling efficiency is very low. In this case, a new type of hot-pressing diamond bit was developed. By changing weakly-bonded materials and adding strengthened granular graphite to bit matrix, the diamond exposure of bit was improved. Based on the tests, the relation between diamond exposure and graphite size, graphite content in matrix and strengthening degree were obtained. Field drilling results showed higher diamond exposure; penetration rate was 1.2m/h; service life exceeded 20m.