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Collaboration Between Major Competitor Service Companies for Optimum Cement Bond Log Acquisition Dann Halverson (BP) Andrew G. Sellar (Baker Hughes); Rodney Howard (Halliburton) Claire Horsman (BP); Luca Pavesi (BP)
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The Problems
3
Accurate determination of cement quality can be critical for safe completion and/or abandonment Operations! The major service companies all have good cement bond evaluation tools with each tool having it advantages. There is very little redundancy of measurements.
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The Problems
4
Accurate determination of cement quality can be critical for safe completion and/or abandonment operations. The major service companies all have good cement bond evaluation tools with each tool having it advantages. There is very little redundancy of measurements.
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The Problems
5
Wouldn’t be great if we could benefit from the strengths of the different service companies cement analysis tools without different tool runs?
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Service Company Relationships
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Service Company Relationships
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Service Company Relationships
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The Solution
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•Halliburton and Baker were asked to workout a protocol to run their respective cement evaluation tools together.
•Both companies were actively involved in the design and execution of the programme, with protocols in place should any operational issues arise.
•Multiple stack up tests completed to ensure tool compatibility and to develop a logging workflow of the combination.
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Segmented Bond Tool (SBT)™
The Segmented Bond Tool (SBT) service provides analysis of the cement bond in six 60°segments for 360°borehole coverage. TM-Trademark of Baker Hughes
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SBT Advantages
• Large casing size range -Up to 22” with special kit -Multiple casing sizes with same tool
• Compensated attenuation measurement
• Relatively easy and straightforward interpretation
• Azimuthally oriented (if necessary)
• Works in gas filled boreholes
• Full circumferential coverage
• Insensitive to heavy fluids or fast formations
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SBT – Reality Check
• Normalization quality
• > 60° resolution (horizontal component)
• Susceptible to micro-annulus effects
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Circumferential Acoustic Scanning Tool (CAST) ™
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• CAST-M 100% Vertical Coverage@ 4 or 12 Samples/Ft. Up to 180 shots/scan horizontal. TM-Trademark of Halliburton
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CAST Advantages (generally applies to any ultrasonic tool)
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• Azimuthally oriented (if necessary)
• Multiple Simultaneous Measurements -Cement evaluation -Casing corrosion and wear
• Full Circumferential coverage at high resolution (both vertical and horizontal)
• Significantly less effected by micro-annulus
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CAST – Reality Check
• Casing condition needs considering.
• Needs liquid in the wellbore
• Typically need different transducer heads for different casing sizes (casing sizes 3.9inch-12.5 inch ID with 6 heads).
• Centralization sensitive
• Mud weight/density/viscosity sensitive
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Combined CAST + SBT benefits
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• Two fully independent measurements.
• Two fully circumferential measurements
• Two measurements with different sonic frequencies
• Complimentary measurements -CAST handles micro-annulus better -SBT handles difficult mud systems better
• Dual nature of the measurements removes the requirement for pressurization during logging or modifying the mud system.
Human hearing
0 10 102 103 104 105 106 107
Lower frequency tools i.e.. CBL
Mid-frequency tools i.e.. SBT
Ultra-sonic tools i.e.. CAST/USIT General cement log frequency ranges
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Combined CAST + SBT Operations
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• The tools are run together -- CAST below the SBT
• Run on Baker cable with Halliburton portable system interfaced with Baker unit.
• CAST was run on the down-pass
• SBT was run on the up-pass
• SBT was primary depth control.
• Two downsides: Tool length At least 1 extra FE’s
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Tool diagram and specifications
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Max OD
Total
Weight
(lbs.)
Total
Length (ft)
Total
Length (m) Rev 2 4/8/2013
4.3 1779.12 114.22 34.18 NAME: A. Sellar /R. Howard
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Composite SBT/CAST logs – Well #1
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CAST Data SBT Data GR
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SBT/CAST logs – Zoomed Well #1
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CAST Data SBT Data GR
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Composite SBT/CAST logs – Well #2
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CAST Data SBT Data GR
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SBT/CAST logs – Zoomed Well #2
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CAST Data SBT Data GR
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Cross-plot SBT amplitude & CAST amplitude – Well #2
23 Cast amplitude
SBT a
mplitud
e
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Cross-plot SBT amplitude & CAST amplitude (coloured by cluster) – Well #2
24 Cast amplitude
SBT a
mplitud
e
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SBT/CAST logs – Coloured from cross—plot Well #2
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SBT/CAST logs – Coloured from cross—plot Zoomed - Well #2
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Keys to Delivery
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•Detailed planning and effective communication between Halliburton, Baker and BP.
•Early engagement of crews in the concept and design of the program, with multiple interface tests completed.
•Readiness and enthusiasm of the two independent logging crews to work together.
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Acknowledgements
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Andrew G. Sellar (Baker Hughes)
Rodney Howard (Halliburton)
Claire Horsman (BP)
Luca Pavesi (BP)
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Thank you
29
Questions?