Drilling bit is the major tool that located at the end of the drillstring. The bit generates the drilling action by scraping, chipping, gouging, or grinding the rock. To help the drill to conduct the cutting action drilling fluid is circulated through the bit to remove the drilled cuttings generated inside the wellbore.
There are many variations of bit designs available. The selection of the bit for a particular application will depend on the type of formation to be drilled as well as the expected operating conditions during the drilling process.
There are several operating parameters of an drill bit including WOB (Weight on bit), RPM, mud properties, and hydraulic efficiency. The drilling engineer must be aware of the design variations, the impact of the operating conditions on the performance of the bit, and the wear generated on the bit in order to be able to select the most appropriate bit for the formation to be drilled.
So, what the best answer for the question What is oil well drilling bit? Drill bit is one of the main part of drilling process, and helps to achieve the aim of drilling: 1) to drill a well as fast as possible by selecting bits which produce good penetration rates, 2) run bits with a long working life to reduce trip time, 3) use bits which drill a full-size or full-gauge hole during the entire time they are on bottom.
There are two types od drilling bits in Rotary drilling: roller-cone and fixed-cutter bits. Roller-cone bits have one or more cones with cutting elements, usually referred to as inserts, which rotate about the axis of the cone as the bit is rotated at the bottom of the hole.
Drilling rig is number 26 at this diagram of a drilling rig.
