复合PDC钻头成功钻穿多夹层地层

PDC BITS SUCCESS IN MULTI-INTERBEDDED FORMATION

ＰＤＣ钻头在钻井破岩中所占比例越来越大，但在软硬交错的多夹层地层钻进时效果却不理想。介绍了一种复合式 ＰＤＣ钻头，该钻头在多夹层地层钻井施工中取得了较好的试验效果。与同地区同井段使用的Ｈ５１７牙轮钻头相比，复合ＰＤＣ钻头机械钻速提高３０％以上，寿命长，进尺提高１倍以上，成本降低２０％以上，并有防斜、纠斜等特点，对加快油田勘探开发速度、降低钻井成本有重要的意义。

Although more and more PDC bits are used in drilling operation, but the results of drilling in the hard and soft interbedded formation are not desired. This paper presents the PDC bits with the satisfactory testing result in the multi-interbedded formation. In comparison with H517 roller bits used in the same block and the same interval, PDC bits have increased penetration rate by 30% and footage by 2 times, and have reduced cost by 20%. PDC bits also have advantages of deviation control and hole straightening. The PDC bits will play a significant role in speeding up the field exploration and production and/or in reducing drilling cost. Subject heading: polycrystalline diamond bit rock roller bit multiple layer testing