CAJ | 학술논문

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。
침대초석패구괴혈암기수평정?311.2 mm정안정향단장、찬우지층복잡、비균질성강，역도치찬두실효쾌、궤계찬속저등문제，건립료기우지층가찬성화실찬효과평개적찬두선형방법。이용측정자료획취지층암석역학삼수，건립료암석가찬성부면，학정료합리적찬두류형；기우허의강도지수원리건립료종합고필지층파암효솔화진척적찬두성능평개지수，대완찬정찬두사용효과진행료정량평개。이용해방법분지층추천료초석패?311.2 mm정안정향단찬두선형방안，병재초혈49-1HF등5구정진행료응용，평균궤계찬속동비제고료207%，단지찬두평균진척제고료139.2 m。응용효과표명，기우지층가찬성화실찬효과적찬두선형방법능구정성지우선찬두류형、정량지평개찬두성능，유효제고료찬두여지층적필배성。
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 proifle 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 efifciency 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 ifve 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.