Roller Cone Bit
A roller-cone bit is a drill bit used for drilling through rock, for example when drilling for oil and gas. Characteristics Drilling bits are attachments that are added to the end of a drillstring to perform the cutting necessary to penetrate the many rock layers between Earth's surface and oil/gas reservoirs. Once a hole is drilled, appropriate casings may be inserted to seal the wellbore formation. Howard R. Hughes Sr. designed and patented the first roller-cone bit in 1909. His design had two rotating cones, but was evolved to a tricone bit (see image above) in the 1930s. The bits are sub divided into different categories depending on the drilling process, including the type of formation being drilled and the operating conditions anticipated. There are two main categories: roller-cone bits and fixed-cutter bits. Roller-Cone bits are composed of rotating disks called cones. Rock hardness is one of the determining factors taken into account when selecting an appropriate dril ...
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