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A New Theory on Cutter Layout for Improving PDC Bit Performance in Hard and Transit Formation Drilling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, IPTC 2013: International Petroleum Technology Conference, Mar 2013, cp-350-00532
Abstract
This paper presents a theory on layout PDC cutters in force-balanced groups. A group of cutters consists of two or three single-set cutters, which is able to efficiently remove a ring of rock. By carefully selecting the order of layout cutter groups, a new feature of a PDC bit is obtained: any three or four consecutive cutters on a bit profile may form a force-balanced cutter group, which ensures the efficient removal of any ring of rock. The concepts are verified by a core PDC bit and by a fullscale PDC bit in laboratory tests. Two field applications are provided in the paper to further validate the theory.