Abstract: Currently,most assessments on the economic performance of ROP enhancement tools are performed upon the completion of relevant drilling operations.Consequently,such assessments may not provide necessary references for the optimal selection of tools for specific well intervals.Thus an innovative technique for assessing the economic performances considering per-foot cost of ROP enhancement tools was proposed.Considering the specifications of ROP enhancement tools,the technique can be used to predict performances of such tools in advance.In later stages,the drilling data from the first operation can be used to predict the economic performance of subsequent operations while drilling.Eventually,the overall economic performance of such tools can be predicted in accordance with per-foot cost.Upon completion of relevant drilling operations,the overall drilling cost in the interval can be determined and compared with those in identical intervals of nearby wells without the necessity of applying the same ROP enhancement tools.Research results and field application results show the innovative technique can be used in assess the economic performance of ROP enhancement tools efficiently and in a timely manner.The technique is useful for identifying the optimal tools for specific intervals.