The Relevance of the Most Irrelevant BHA and Drillstring Component (Why I decided to mess with the conventional blade stabiliser) Tom Newman March 10 th 2016
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The Relevance of the Most Irrelevant
BHA and Drillstring Component(Why I decided to mess with the conventional blade stabiliser)
Tom Newman
March 10th 2016
Directional Problems
BAT-2 Downhole Dynamics
Poor BHA response, energy transfer & MWD Interference
BHA DamageMWD/LWD, PDM, RSS failures, excessive stabiliser wear
Poor Hole QualityPoor energy transfer, trip time (ledges), csg running issues
Vibration Related Issues
Whirl as Shape
Is a sine wave
Bit tilted by wave, reduces ROP & increases MSE
Shape crosses wellbore = quiet (nodes)
Mechanical Specific Energy best indicator
Source: Fred Dupriest, Thus the Lowly Stabiliser
Fit for Purpose?
Fit for Purpose Solution?
Poor Hydrodynamic Design
Static Flow Modelling Research
Rotational 100 rpm
Flow Modelling Research
Switchblade
Weight Transfer
Hydrodynamic Design
Enhanced Stabiliser
Retention Method Research
Pull and push
Test blade Test boltsTest bolts
Final Retention System
An integral, interference fit pin, with precision radii and a locking bolt array
Run History
Run in Dutch North Sea, UAE, KSA, France, Turkey, and Belgium
Less balling up, stick/slip, vibration & little wear with more stable torque. All other BHA components in good condition.
Wells drilled 20
Hours drilled> 7,000 hrs
Meters drilled> 56,000m / 183,000ft
Case History:
Weight Transfer & Less Balling
Dutch North Sea
OBJECTIVE:16" hole section 659m - 1,566mMotor BHA (1.15° ABH) + 2 x Switchblades 15" & 15 ¼"Build to and hold @ 25˚ inclination
CONCERNS:Packing offBalling
Case History:
Weight Transfer & Less Balling
DRILLING OBSERVATIONS:
No motor stalls
No hanging up
Good tool face control
POOH OBSERVATIONS:
No clay ball problems
No packing off
Fixedblade
Known gauge ODs
Tangent sections
Lower cost applications
Case History:
Weight Transfer & Less Balling
Western Gulf Region
OBJECTIVE:8 1/2" hole section 6,428ft – 9,598ftMotor BHA (1.50° ABH) + 1 x Fixedblade 7 7/8" (8") Hold horizontal with azimuthal left turn @ 27˚
CONCERNS:Sliding ROPTorque levels
Case History:
Weight Transfer & Less Balling
Run Results (Spiralblade vs. Fixedblade)Backflow induced packing off (L0 above)
Minimal surface weight transfer / hang upPOOH No motor stalls
Cross Section Comparison
To see full simulation go to:
https://youtu.be/eRcm44-JVok
Questions?
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