【摘要】 钻头的合理选型对提高钻进速度、降低钻井成本起着重要作用。应用改进的经济效益指数法对流花LH11-1区块的钻头使用效果进行了评价,结合地层岩石力学参数评价结果优选出了与流花LH11-1区块地层相适应的钻头型号。改进的经济效益指数法考虑了钻头磨损的影响,从而使评价结果更加客观合理。由于没有搜集到按垂深进行地层划分的数据,提出了按照地层岩石力学性质进行地层分层的新方法,该地层分层方法首先将地层的多种岩石力学性质进行聚类分析,然后根据层内离差平方和最小,层间离差平方和最大的原理进行地层划分,此种地层划分方法对于钻头优选、钻进参数优化以及合理制定钻进措施等具有重要意义。现场应用结果表明,文中给出的钻头选型结果和地层分层方法是合理的,能够在大位移井中应用。更多还原

【Abstract】 Rational selection of the bit type is of major importance in achieving high penetration rates and reducing drilling comprehensive cost. Drill bit using effects were evaluated by use of improved benefit exponential model.Combined with evaluation results of rock mechanics parameters,bit type for Liuhua oilfield was optimized.Because of considering bit wear,improved benefit exponential model was more reasonable.According to rock mechanics parameters,Formation was classified for lack of formation classification data.It is very important for selecting bit type,optimizing drilling parameters and programming drilling measures.According to the method for formation classification,many rock mechanics parameters were clustered.Then formation was classified on the least square which was least in interior formation and was greatest in interbedded formation.The field test results indicate that bit selection result and formation classification method are feasible.更多还原