Paper: Development And Applications Of Unique Roller Cone Bit Technologies

It is usually a difficult task for drillers to choose a suitable roller cone bit in order to efficiently drill through interbedded formations. When experience and/or drilling log information indicate the interbedded formation is drillable with an insert type roller cone bit, a conical type insert bit is usually chosen because of the durability of its cutting structure. This paper discusses the development and applications of a new type of roller cone bit with chisel inserts that are able to drill very efficiently through interbedded formations. The durability of the new bit is comparable to that of conical insert type bit, but the rate of penetration is significantly improved. The new roller cone bits incorporate new cutting structure with enhanced drillablity, durability, and reduced vibration. Several case studies in western Texas and Oklahoma have been provided in the paper.