Prodeco (Czechia)

ABSTRACT Polycrystalline diamond compact (PDC) drill bits have proven to be economical in the Austin Chalk fields in Southeast Central Texas. Many contractors have expressed concerns over reduced drill pipe life when using the PDC bits on rotary because of the higher rotating speeds and higher bit torque. Field results and economic analyses show that PDC bits are more cost-effective, even with reduced drill pipe life, than roller-cone bits in the proper formations. These results also show that the use of downhole motors in conjunction with PDC bits can eliminate the problem of premature drill pipe failures, while still resulting in lower overall drilling costs and fewer days to drill a well.