Rotary Steerable
Systems
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ASL
5536
Downhole Sliding Problems
Maintaining orientation
Low effective ROP
Poor hole cleaning
Inability to slide
Differential sticking
Buckling and lock up
High tortuosity
Build-up rate formation
sensitive
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ASL
5536
PowerDriv
e
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ASL
5536
What is PowerDrive?
• 3-D, fully steerable tool that
makes changes to inclination and
azimuth with continuous
drillstring rotation
• No “sliding mode”
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ASL
5536
PowerDrive Principle of
Operation
Side force or push the bit tool
Pads extend dynamically from a rotating
housing
Curvature defined by 3 points of contact
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ASL
5536
PowerDrive - Job History to 03/00
•Total wells = 55
•Total runs = 201
•Total circulating hours = 9,825
•Total footage = 243,068 ft
•Depth range = 1,283 to 34,967 ft
•Maximum DLS = 11°/100 ft
•Inclination range = 4 to 125°
•Longest run = 5,255 ft
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ASL
5536
PowerDrive Operations
Case Histories
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ASL
5536
Meeting the 10Km Challenge
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ASL
5536
PowerDrive - Wytch Farm M-11,
UK
•
World record extended
reach well
• Measured depth at
TD
= 34,967 ft
• Horizontal displacement
at TD = 33,156 ft
• Planned to drill 5,548 ft in
49 days
• Drilled 7,681 ft of
horizontal hole in 44 days
• 113 ft per day planned,
175 ft per day achieved
by PowerDrive BHA
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ASL
5536
Conclusions
•
PowerDrive’s impact on drilling operations have
– Increased departures and minimized risks in ERD wells
– Reduced lost in hole incidents
– Allowed tough designer wells to be drilled safely
– Improved overall drilling efficiency and subsequently lead to
reduced drilling costs
•
The PowerDrive675 system has proven itself in numerous
drilling applications as a reliable replacement for
conventional tools
•
PowerDrive900 system for 121/4-in. hole size is currently in
field test
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ASL
5536
AIM- At Bit Inclination
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ASL
5536
AIM - At Bit Inclination
Measurement
Integral to Standard Power Pak Motors.
Continuous Single-Axis Inclination ~1ft from Bit vs 40 ft
for MWD
Telemetry to 60ft behind Bit
Rotating Near-Bit Stabilizer
20,000psi, 150 °C Rating
200+hr Battery Life
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ASL
5536