Rotary Steerable Tools

Rotary steerable system called RSS, allows the string to rotate continuously, and at the same time, steer the string to the desired target location. The latest generation of these can actively steer themselves toward a defined target without intervention from the surface. A big advantage in rotary steerable systems is that by rotating the drill-string, axial drag is reduced, increasing the amount of WOB available at the bit. Due to the rotation of the drill-string, there is also a considerable improvement of hole cleaning, and reduced risk of differential sticking.

rotatary stearable system

Rotary Steerable System Tool

There are two types of RSS system:

  • Point-the-bit
  • Push-the-bit

Point-the-bit allows the bit to tilt up, right, down or left, to the desired direction, using some deflection mechanism whereas the push-the-bit allows the bit to be forced to the desired direction using the bit side force. Due to the nature of the mode, the bit should be compatible to withstand the side forces. The push-the-bit system should have a side-cutting structure, and short gage vis-à-vis long gauge, for point-the-bit to act as pivot for deflection.

The mechanism involved may have adjustable stabilizers, kickpads, cams, eccentric rings, etc,. allowing the various options of tilt angles.

 

OTHER REFERENCES

More details can be obtained from Drilling Calculations501 Solved Problems for Drilling Operations.

SEE ALSO

Glossary of Drilling Operations

The Oil Drilling (Video)

Conversion Factors

The Mud Lag Time (Video)

General Terms

Gel Strength

Mud Weight

Formation Pressures

Well Control Calculations

The General Calculations(Video)

EXTERNAL LINKS 

RSS

The Halliburton RSS Point the Bit System (Video)

The Baker Hughes RSS Push the Bit System (Video)

The Weatherford RSS (Video)

The Schlumberger RSS Push the Bit System (Video)

The Gyrodata RSS (Video)

Mud Motor

The Dyna-Drill Motor (Video)

The Jaguar Mud Motor System (Video)

The Baker Hughes Navi-Drill (Video)

The Mud Motor Basic Function (Video)

The Hunting Mud Motors (Video)