METODE PENGEBORAN, SISTEM, MATA BOR KONIS PELINDIS, DAN METODE RANCANGAN DENGAN OPTIMASI ORIENTASI GIGI

摘要

A novel and improved roller cone drill bit and method of design are disclosed. A roller cone drill bit (10) for drilling through subterranean formations having an upper connection for attachment to a drill string (12), and a plurality cutting structures (16) rotatably mounted on arms extending downward from the connection. A number of teeth (18) are located in generally concentric rows on each cutting structure (16). The actual trajectory by which the teeth (18) engage the formation is mathematically determined. A straight-line trajectory is calculated based on the actual trajectory. The teeth (18) are positioned in the cutting structures such that each tooth (18) having a designed engagement surface is oriented perpendicular to the calculated straight-line trajectory.