Custom designed bits improve efficiency, lower costs

Two examples, one in a hard-rock, slimhole horizontal and the other in a North Texas vertical well, show how custom-designed drilling bits can lower costs and improve drilling performance.In both of these cases, the operators realized substantial cost-per-foot savings after a thorough analysis of formation characteristics and bit performance and drilling with custom bits for specific applications.Hard rock slimhole horizontalBurlington Resources Inc. in a Lea County, NM, 43/4-in. slimhole horizontal had a high incidence of bit failure in a section that was 70-90% chert, a higher than expected concentration. A 43/4 in. 8-1-7, C8 LRGSP bit improved the efficiency of drilling chert in a hor...

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