- Rotary steerable system
A rotary steerable system is a new form of drilling
technology used indirectional drilling . It employs the use of specialized downhole equipment to replace conventional directional tools such asmud motor s.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 asteerable 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™] fromGyrodata ( [http://www.gyrodata.com/ Website] )
* [http://www.slb.com/content/services/drilling/steerable/powerdrive_family.asp PowerDrive] fromSchlumberger ( [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] fromSperry 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] fromPathfinder ( [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™] fromDevico AS ( [http://www.devico.com/ Website] )ee also
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Directional boring
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