Formation evaluation in high-angle and horizontal wells David Maggs Based on: Rapid and Practical Characterization of Near wellbore Layer Structure and Properties in High-Angle and Horizontal Wells. Society of Petrophysicists and Well-Log Analysts, Annual Conference 2015, Long Beach, California Salehi, M. T., Abadie, J., Asif, S., Ito, K., Maggs, D., Morriss, C., … Griffiths, R.
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Formation evaluation in high-angle and horizontal wells · Formation evaluation in high-angle and horizontal wells David Maggs Based on: Rapid and Practical Characterization of Near
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Formation evaluation in high-angle and
horizontal wellsDavid Maggs
Based on:
Rapid and Practical Characterization of Near wellbore Layer Structure and Properties in High-Angle and Horizontal Wells.
Society of Petrophysicists and Well-Log Analysts, Annual Conference 2015, Long Beach, California
Salehi, M. T., Abadie, J., Asif, S., Ito, K., Maggs, D., Morriss, C., … Griffiths, R.
DG
Outline
High-angle and horizontal well
formation evaluation challenges
Layer based petrophysics
– Global layer models
– New local layer model and workflow
Examples
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Why high-angle and horizontal formation evaluation?
Add value to LWD logs
Geometric effects make it
difficult to use directly for
quantitative Petrophysics
HaHz data often ignored in
models
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High angle challenge
Measurements :
Respond to multiple layers
Show extended bed boundary effects
Complicates log interpretation
Solution – layer based petrophysics
Global layer model:
Laterally extensive layers
Suited for deep reading resistivity
Manually constructed
Based on Geological model
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The 3DP data interpretation workspace
Logs on the top
Model built below:
Existing models
Boundary
crossings
Dips
Local knowledge
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The 3DP model
Objective:
Simplest model
consistent with the
logs
Layer properties
automatically
populated & manually
adjusted by user
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Model-Compare-Update
Initial model
Used resistivity in middle
of bed
Layer model => Shoulder
affect
Adjust geometry & layer
properties
Final model
Match resistivity &
polarization horns
Sand resistivity doubled, water saturation reduced 40%