The Origin of Roller Bits
The cone bit originated in 1909. In the following decades, cone drills have made great progress, with significant improvements in the material, cutting parts, drill bearings, cleaning devices, and more.
In 1925, a self-cleaning roller bit was developed. It solves the problem of rock debris accumulation between the teeth of soft formation drill bits, which is prone to mud pockets.
In 1933, a three cone drill bit with rolling bearings was developed.
In 1935, after further improvement, a cone offset tricone bit was developed. In the salt layer, red layer, gypsum layer, limestone layer, and shale, the drill bit index has increased.
Three Major Revolutions of Roller Bits
In 1949, jet cone drills were introduced. At that time, the mechanical drilling speed could be increased by 50%, and the usage of the drill bit increased from 33% to 65%.
In 1951, a hard alloy ball tooth roller bit was developed. In the extremely hard abrasive flint layer, the drill bit's footage has increased from 1 meter to over 10 meters.
In 1960, a sealed lubricated bearing cone bit was successfully developed. Make the working time of the drill bit reach 40-60 hours, and increase the drill bit footage by 50%.
In 1968, a sealed lubrication sliding bearing roller bit was successfully developed. It has more than doubled the working time of the drill bit, reaching 80-120 hours, thereby accelerating the drilling speed and reducing costs.
Nowadays, the superiority of jet sealed lubrication (rolling or sliding) bearings embedded with hard alloy tooth drill bits (referred to as three-in-one or four-in-one drill bits) has been demonstrated in practice, and its technical and economic indicators greatly exceed those of ordinary cone drills.
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