中文摘要：

基于微钻岩石可钻性试验与岩石强度刻划试验破岩机制一致性,通过开展试验获得两种试验岩石破碎比功的转化关系,结合岩石PDC钻头可钻性级值求取方法,建立利用刻划岩石破碎比功求取岩石PDC钻头可钻性级值模型,形成一种通过刻划岩心表面得到岩石PDC钻头可钻性级值剖面的方法。结果表明,该方法不但与微钻可钻性试验结果具有很好的一致性,还充分表征了矿物组分、胶结强度、微观结构等复杂因素变化对岩石PDC钻头可钻性级值的影响,且不破坏岩心的整体结构,提高了岩心的利用率,推广应用价值高。

英文摘要：

A new- method for assessing rock＇s drillabity for PDC bits via a scratch testing was proposed in coupling with the rock breaking mechanisms using micro PDC bits and scratch blades. In this study,a large numbers of micro PDC bit drilling and scratch testing experiments were conducted in order to establish the correlation of the crushing work ratio between the two types of rock breaking processes,and a new rock＇s drillability model for PDC bits was established based on the crushing work ratio of the rock scratch test. The new method can provide precise assessments of rock＇s drillability for PDC bits and is in consistency with the micro PDC bit testing. The scratch testing not only can capture the effects of intrinsic heterogeneity of rocks on drillability,but also can keep the integrity of the rock cores.