Rotary steerable system

A rotary steerable system is a new form of drilling technology used in directional drilling. It employs the use of specialized downhole equipment to replace conventional directional tools such as mud motors.They are generally programmed by the MWD engineer or directional driller who transmits commands using surface equipment (typically using either pressure fluctuations in the mud column or variations in the drill string rotation) which the tool understands and gradually steers into the desired direction. In other words, a tool designed to drill directionally with continuous rotation from the surface, eliminating the need to slide a steerable motor.

The advantages of this technology are many for both main groups of users: geoscientists & drillers. Continuous rotation of the drill string allows for improved transportation of drilled cuttings to the surface resulting in better hydraulic performance, better weight transfer for the same reason allows a more complex bore to be drilled, and reduced well bore tortuosity due to utilizing a more steady steering model. The well geometry therefore is less aggressive and the wellbore (wall of the well) is smoother than those drilled with motor. This last benefit concerns to geoscientist because the measurements taken of the properties of the formation can be obtained with a higher quality.

Available models

There are currently 7 main systems on the market.
* [http://www.gyrodata.com/node/products/rss/rss Well-Guide RSS™] from Gyrodata ( [http://www.gyrodata.com/ Website] )
* [http://www.slb.com/content/services/drilling/steerable/powerdrive_family.asp PowerDrive] from Schlumberger ( [http://www.slb.com/ Website] )
* [http://www.bakerhughesdirect.com/cgi/inteq/INTEQ/INTEQDispatcher.jsp?bookmarkable=Yes%20+%20%20&Workflow=INTEQ_SERVICES&CurrentState=VALIDATE_VIRTUAL_ENGINEER&LoggingServiceName=atk&LoggingServiceSource=INTEQ AutoTrak] from Baker Hughes INTEQ ( [http://www.bakerhughes.com/ Website] )
* [http://www.halliburton.com/ps/Default.aspx?navid=24&pageid=395&prodid=MSE%3a%3a1055447935682222 Geo-Pilot] and [http://www.halliburton.com/ps/Default.aspx?navid=24&pageid=347&prodid=PRN%3a%3aIXP5AQE8Z EZ-Pilot] from Sperry Drilling Services ( [http://www.halliburton.com/divisions/Default.aspx?navid=241&pageid=693 Website] )
* [http://www.pathfinderlwd.com/services/directional_drilling/3d_rotary_steerable_tool.asp Pathmaker] from Pathfinder ( [http://www.pathfinderlwd.com/ Website] )
* [http://www.weatherford.com/weatherford/groups/public/documents/drilling/ds_rotarysteerablesystems.hcsp Revolution] from Weatherford ( [http://www.weatherford.com/ Website] )
* [http://www.devico.com/english/index.php?option=com_content&view=article&id=57&Itemid=29 DeviDrill™] from Devico AS ( [http://www.devico.com/ Website] )

ee also

*Directional boring