工程设计学报2018，Vol.25Issue(1)：43-49,7.DOI:10.3785/j.issn.1006-754X.2018.01.006
分散扶正与保径的新型PDC钻头设计与现场试验
Design and field test of the new PDC bit with divided gage pad
摘要
Abstract
PDC bit is widely used because of its high drilling efficiency.Nevertheless,when drilling in complex formations,such as the hard laminated formation,gravel formation and multi-inter-bedded formation,due to frequent stress changes and lower working stability,the service life of the PDC bit will be significantly reduced since impact failure will occur within the PDC cutters that suffer severe load fluctuation.Aiming at prolonging service life of the PDC bit used in com-plex formations,a new PDC bit with divided gage pad was put forward,and the analysis on the working stability and flow field characteristic for PDC bit were conducted.Based on the analysis results,the main cutting structure and the divided gage pad was designed and optimized.Regard-ing to the situation of large dimensions of sandstone and conglomerate,the new PDC bit with di-vided gage pad was proved to be successful in field test.Results of the field test showed that the borehole was of high quality,and the total footage of the PDC bit was 1 339.16 m,including 605 m sandy conglomerate formation,saving 6 tripping times with high rotation speed and long serv-ice life.T he research result show s that the technique of divided gage pad can significantly improve the working stability and adaptability of the PDC bit in hard or inhomogeneous formation,and this proves that the technique is effective to improve the performance of PDC bit drilling in com-plex formations.关键词
PDC钻头/分散扶正与保径/稳定性/不均质地层Key words
PDC bit/divided gage pad/stability/inhomogeneous formation分类
能源科技引用本文复制引用
林敏,谢宗亮,杨迎新,李维均,陈炼,任海涛..分散扶正与保径的新型PDC钻头设计与现场试验[J].工程设计学报,2018,25(1):43-49,7.基金项目
国家自然科学基金资助项目(51374176,51304168,51504029) （51374176,51304168,51504029）
中国石油天然气集团公司科学研究与技术开发项目(2013E-38-04) （2013E-38-04）
