04-11_new-staff-ReedHycalog.htm (Nov-2004) ///

DPI-ReedHycalog has developed an improved bi-center bit for small hole sizes (9-7/8 in. and smaller) and is currently named a speed reamer, casing-shoe-driller, CSD+, bi-center bit. The goal was to make improvements in bi-center bits, such as less angle drop in tangent sections, increased resistance to string vibrations, and generally better dull conditions. The initial CSD+ design consisted of a pilot and reamer section that was similar to standard CSD designs, but a mid-reamer was added between the pilot and reamer. The concept behind this change is called geometric stability.

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