Abstract:

Middle?deep strata of Bohai oilfield is the focus of further exploration and development, of which Bozhong X is a typical mid?deep oil and gas field. The main reservoir with dense lithology and strong abrasiveness is stored for more than 4 000 m depth, resulting in much more complex situations during the early drilling stage, which seriously restricted the reservoir exploration process. In order to solve the problems of complex pressure, serious tool choke and slow penetration rate in the deep?medium strata, this work figured out TorkBuster and Ninja teeth PDC bit efficiency improvement technology and its corresponding applications, using stratigraphic features of Bozhong X oil and gas field as a research sample. The rock breaking mainly involves combination of crushing and rotary shearing, which is mainly used to improve the drilling speed while ensuring the well quality. The TorkBuster with special Ninja teeth PDC bit in BZ?E well can properly overcome the high hardness and compact of granite gneiss, which can increase the drilling speed and prolong the service life of the bit at the same time. It provides a new method for improving the drilling speed in the deep?medium strata of Bohai oilfield and saving drilling cost.

Key words: TorkBuster, Ninja teeth PDC bit, Middle?deep strata, Granite gneiss

摘要：

中深层油气田是渤海油田进一步勘探开发的重点，其中渤中X油气田是典型的中深层油气田，主要目的储层埋深均超过4 000 m，岩性致密、研磨性极强，前期钻探出现了较多复杂情况，严重制约了储层的勘探进程。为了解决中深层地层压力复杂、钻具憋跳严重及机械钻速慢等难题。基于渤中X油气田地层特征，开展了扭力冲击器配合忍者齿钻头提效技术的开发与应用，其破岩时以冲击破碎为主，并加以旋转剪切，在保证井身质量的同时提高机械钻速。扭力冲击器配合专用忍者齿钻头在BZ?E井进行了应用，能够较好地克服地层硬度高且致密的花岗岩地层，在提高机械钻速的同时，延长钻头的使用寿命，同时对提高渤海油田中深层钻进速度，节省钻井成本提供了新的方法。

关键词: 扭力冲击器, 忍者齿钻头, 中深层, 花岗片麻岩