【摘要】 岩石可钻性是石油钻井中优选钻头类型的重要依据。岩屑声波法评价岩石可钻性以容易获取、来源充足的钻井岩屑为研究资料,通过测定岩屑的声波波速,来定量计算岩石的可钻性级值,可以获得连续的地层信息,实现钻头类型的优选。试验分析了毫米级岩屑波速测量的可行性和岩屑波速与岩石可钻性级值的相关性,表明岩屑波速具有良好的代表性,且岩屑波速与岩石可钻性级值(Kd)有着密切的关系。测定了26块有代表性的岩芯的可钻性级值及相应岩屑的声波速度,建立了岩石可钻性级值(Kd)与岩屑波速的关系模型。在一口预探井进行了随钻检测地层可钻性的现场试验,证明该方法是有效的。更多还原

【Abstract】 The rock drillability is an important index for optimizing the selection of drill bit. A new methodology for evaluating rock drillability by acoustic velocity of cutting is developed,which can easily and continuously provide drillability information of stratum. The feasibility of the measurement on rough rock fragments of very small dimensions and the correlativity between acoustic velocity of cutting and rock drillability index are investigated. The results show that the acoustic velocity obtained from small cuttings is well related to rock drillability index. The relation model between the index and the acoustic velocity is developed. Test drilling is performed and shows that this method is effective.更多还原