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5 4 overview RSS feb 2000

Rotary Steerable
Systems

1
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

2

ASL
5536


PowerDriv
e

3
ASL
5536


What is PowerDrive?

• 3-D, fully steerable tool that

makes changes to inclination and
azimuth with continuous
drillstring rotation

• No “sliding mode”

4
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

10
ASL
5536


AIM- At Bit Inclination

11
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

12
ASL
5536



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