Graham Clydesdale Security DBS AberdeenAndre Leseultre Etienne Lamine Security DBS Brussels A recently developed core bit reduces fluid invasion in the cut core by minimizing the exposure to the drilling fluid and by increasing the rate of penetration (ROP). A high ROP during coring is one of the major factors in reducing mud filtrate invasion in cores. This new low-invasion polycrystalline diamond compact (PDC) core bit was designed to achieve a higher ROP than conventional PDC core bits without detriment to the cutting structure. Field testing indicates that this core bit achieves higher ROPs than conventional PDC co...

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