而钻头在破岩过程中，既要求具有高效的破岩能力，又要求具有强耐磨性和低阻力。
The bit needs not only the high rock-breaking capacity but also the strong wear and low resistance during rock-breaking process.
本文介绍了弱包镶强耐磨性胎体钻头的基本原理及使用效果。
This paper describes the basic principle and use of the bit with weak holding and high wear resistant matrix.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
The deep formation has a high degree of hardness and abrasivity; the bit type selection is difficult and the ROP is low especially under the high density mud.
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