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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
The Relevance of the Most Irrelevant BHA and Drillstring Component - - PowerPoint PPT Presentation
The Relevance of the Most Irrelevant BHA and Drillstring Component - - PowerPoint PPT Presentation
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 BAT-2 Downhole Dynamics Vibration Related Issues Directional Problems Poor BHA
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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
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Fit for Purpose?
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Fit for Purpose Solution?
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Poor Hydrodynamic Design
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Static Flow Modelling Research
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Rotational 100 rpm Flow Modelling Research
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Switchblade
Weight Transfer Hydrodynamic Design Enhanced Stabiliser
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Retention Method Research
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Pull and push Test blade Test bolts Test bolts
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Final Retention System
An integral, interference fit pin, with precision radii and a locking bolt array
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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
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Case History: Weight Transfer & Less Balling
Dutch North Sea OBJECTIVE: 16" hole section 659m - 1,566m Motor BHA (1.15° ABH) + 2 x Switchblades 15" & 15 ¼" Build to and hold @ 25˚ inclination CONCERNS: Packing off Balling
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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
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Fixedblade
Known gauge ODs Tangent sections Lower cost applications
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Case History: Weight Transfer & Less Balling
Western Gulf Region OBJECTIVE: 8 1/2" hole section 6,428ft – 9,598ft Motor BHA (1.50° ABH) + 1 x Fixedblade 7 7/8" (8") Hold horizontal with azimuthal left turn @ 27˚ CONCERNS: Sliding ROP Torque levels
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Case History: Weight Transfer & Less Balling
Run Results (Spiralblade vs. Fixedblade) Backflow induced packing off (L0 above) Minimal surface weight transfer / hang up POOH No motor stalls
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Cross Section Comparison
To see full simulation go to: https://youtu.be/eRcm44-JVok
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