Hybrid drillbits improve harsh drilling performance: New technology handles chert challenges

摘要

When faced with a formation containing chert, a roller cone insert (RCI) bit is the first type of drill-bit technology that comes to the drilling engineer's mind. The ability of the RCI bit to crush chert is proven and usually has good results. Another option is to try a diamond-impregnated bit, which may require the use of a turbine, adding to the cost of the operation. Polycrystalline diamond compact (PDC) bits may be used and will show a high initial ROP, but the ROP will soon be reduced by the damaging effect chert has on PDC cutters.