The quality of the drill bit, whether the type of drill bit is suitable for the lithology of the formation, plays an important role in accelerating drilling speed and improving the depth of a single drill bit.

Drilling an oil and gas well generally requires the use of multiple drill bits of different sizes. When drilling the upper formation, larger diameter drill bits should be used. Due to the soft formation in which the drill bit drills, a single drill bit has more footage and a shorter usage time. One drill bit can generally be reused for several wells; When drilling into the lower strata, smaller diameter drill bits should be used. Due to the hardness of the strata and the limited footage of a single drill bit, multiple drill bits are generally used.

The drilling depth of a new drill bit in a well mainly depends on the size and type of the drill bit, the softness and hardness of the formation, and the coordination of drilling parameters.

Generally speaking, the smaller the size of the drill bit, the harder the formation, and the less footage; The larger the size of the drill bit and the softer the formation, the more drilling depth the drill bit will have.