关键词: PDC钻头, 钻头设计, 岩性特点, 多夹层, 牙轮钻头, 切削结构, 水力结构

Abstract: PDC bits have been used more and more in drilling process,but they have not got success in multi-interbedded formation.This paper presents the optimization design on the new PDC bit by means of the formation feature of the multi-interbedded in Shenli Oilfield.It developed the new method about the cutting structure of PDC bits,improved the hydraulic structure design about PDC bits,and applied many method increassing the stability of PDC bits. According to the optimization design,a new type of PDC bit was produced and got better result when it was used in the multi-interbedded formation. Compared with roller bits,the PDC bit can achieve high bit footage and rate of penetration,and get high quality hole.The bit is important to increase rate of oilfield exploration and development and to decrease drilling cost.

Key words: PDC bit, bit design, lithology, multi-interbedded, roller bit, cutting structure, hydraulic structure