焦石坝区块?311.2 mm 井眼定向段钻头优选与应用

Selection and application of drill bit for directional section of ?311.2 mm well in Jiaoshiba Block

刘明国 孔华 兰凯 张敏 李亚南

LIU Mingguo KONG Hua LAN Kai ZHANG Min LI Yanan

中原石油工程有限公司钻井工程技术研究院，河南濮阳　457001

Drilling Engineering and Technology Research Institute, Zhongyuan Petroleum Engineering Co. Ltd., Puyang 457001, China

针对焦石坝区块页岩气水平井?311.2 mm 井眼定向段长、钻遇地层复杂、非均质性强，易导致钻头失效快、机械钻速低等问题，建立了基于地层可钻性和实钻效果评价的钻头选型方法。利用测井资料获取地层岩石力学参数，建立了岩石可钻性剖面，确定了合理的钻头类型；基于虚拟强度指数原理建立了综合考虑地层破岩效率和进尺的钻头性能评价指数，对完钻井钻头使用效果进行了定量评价。利用该方法分地层推荐了焦石坝?311.2 mm 井眼定向段钻头选型方案，并在焦页49-1HF 等5 口井进行了应用，平均机械钻速同比提高了207%，单只钻头平均进尺提高了139.2 m。应用效果表明，基于地层可钻性和实钻效果的钻头选型方法能够定性地优选钻头类型、定量地评价钻头性能，有效提高了钻头与地层的匹配性。

In line with long directional interval in horizontal ?311.2 mm wellbore of shale gas, encountering complex formations and strong heterogeneity in Jiaoshiba Block, which may easily lead to rapid bit failure and low ROP, etc. A method of drill bit selection was built on formation drillability and evaluation of actual drilling effectiveness. The logging data is used to obtain formation rock mechanical parameters, build the profile of rock drillability and determine the proper bit type. The bit performance assessment index was built based on virtual intensity index principle by comprehensively considering the formation rock breaking efficiency and footage, and quantitative evaluation was made to the effectiveness of bits used in drilling and completion. Using this method, the drill bit selection scheme was recommended by formations for directional interval of ?311.2 mm hole in Jiaoshiba Block, and was used in five wells such as Jiaoye-49-1HF well. The average ROP was increased by 207%, and average footage of individual bit was increased by 139.2 m. The application effect shows that the method of drill bit selection based on formation drillability and actual drilling effectiveness can qualitatively select the bit type and quantitatively evaluate the bit performance, hence effectively improving the matching between the bit and the formation.

10.13639/j.odpt.2015.03.007