Main functions and purpose of the rotary drill bit:
Providing bit rotation without the need to rotate the entire drill string.
Allows for more precise control of the drilling path and reduces pipe wear.
Improves drilling efficiency in difficult conditions.
Allows drilling in hard and abrasive rock, as well as in deviated and horizontal wells.
Reduces stresses on the drill string.
Eliminates the need for full rotation of the drillstring, which reduces mechanical stress and equipment wear.
Improved drilling control.
Used in geosteering and rotary steerable systems (RSS) for accurate well control.
Principle of operation of the TCD:
A stream of drilling fluid is fed into the motor. Inside the motor, the rotor rotates, generating torque. The torque is transmitted to the drill bit, allowing it to rotate. The drilling fluid continues to circulate, cooling and cleaning the bottom of the hole.
Where is TCD used?
In directional and horizontal drilling.
In hard and abrasive rock drilling.
When drilling wells with high temperatures and pressures.
In difficult geologic conditions where traditional rotary systems are less efficient.
Advantages of using rotary rotary drilling systems:
High power and drilling efficiency.
Allows directional drilling with high accuracy.
Reduces drill string wear.
Enables drilling in difficult geologic conditions.