Similarity evaluation of stratum anti-drilling ability and a new method of drill bit selection

YAN Tie,XU Rui,SUN Wenfeng,LIU Weikai,HOU Zhaokai,YUAN Yuan,SHAO Yang

Table 2 Calculation results of entropy weight.

Formation Entropy weight WOB RPM Pump displacement Footage Net drilling time ROP Integrity of drill bit running-in the well Integrity of drill bit pulling-out of the well Drill bit cost I 0.0192 0.0051 0.0055 0.4873 0.2567 0.2068 0.0003 0.0067 0.0124 II 0.0171 0.0055 0.0054 0.4195 0.3319 0.1969 0.0013 0.0079 0.0145 III 0.0133 0.0021 0.0025 0.4343 0.3016 0.2241 0.0012 0.0045 0.0163 IV 0.0144 0.0022 0.0028 0.3624 0.3452 0.2474 0.0013 0.0053 0.0190