元坝地区珍珠冲地层新型三牙轮钻头的研制与应用

Development and Application of New Type Tri-cone Drill Bit in Zhenzhuchong Formation of Yuanba Area

摘要:

砂砾岩地层是钻井工程中的难钻地层，如何提高砂砾岩地层的钻进效率和钻头寿命一直是工程实践中的重要问题。针对在元坝地区珍珠冲石英砂砾岩地层钻进过程中，使用普通型牙轮钻头外排齿易早期断齿、综合使用指标低的问题，开展了地层岩性、钻头使用与失效分析。针对性地开展了钻头的切削结构、齿材优化以及加强保径等方面的研究，优化设计、研制出HJT547GKL型新型三牙轮钻头。现场试用结果表明，这种新型牙轮钻头在元坝地区珍珠冲组石英砂砾岩地层钻进中有较高的行程进尺。该钻头是一种结构简单、扶正保径好、可靠实用，适用于较硬、有硬夹地层的新型实用三牙轮钻头。

Abstract:

Sand conglomerate formation is a difficult drilling stratum in drilling engineering, how to improve the drilling efficiency and bit service life in sand conglomerate stratum have been the important problem in engineering practice. In view of the problems of early breaking of common cone bit outer teeth and low comprehensive use index in the drilling process of Zhenzhuchong quartz sand conglomerate strata in Yuanba area, the stratigraphic lithology, drill bit usage and failure are analyzed, and especially aiming at the bit cutting structure, tooth material optimization and bit gauge retaining strengthening, new HJT547GKL tri-cone drill bit is optimally designed and developed. Field test result shows that this new type of cone bit has high stroke footage in Zhenzhuchong formation of Yuanba area, which is reliable, practical and suitable for hard formations and formations with hard interlayer drilling with simple structure and good gauge retaining.