screen-out assessment · data integration –well completion ... (psi) filled >7500psi rate...
TRANSCRIPT
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Screen-Out Assessment
Liberty Engineering Solution
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Problem Stages
• High near-wellbore (NWB) Pressure
• Screen-outs
Costs Everyone- $$ and Time
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Why Problems Happen?
• Geology-o Lithology (marls, bentonites, etc.)
o Structure (faults, regional stresses, etc.)
• Engineering-o Proppant size or amount
o Fluid type (gel viscosity, acid, etc.)
o Stress Shadow (previous stage or adjacent zipper well)
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Integrating Geology with Completions• Gamma Ray log (api)- Measurement of the radioactivity of rocks (Uranium, thorium, potassium)
• Used to interpret lithology (Chalks/Clean sands low GR, Marls/Bentonites/clays high GR), recorded in feet during drilling
• BH Pressure (psi)- pressure being applied to the formation including net pressure, normalized for friction, recorded in time during completion
• Rate (bpm)-downhole rate that fluid is entering the formation, recorded in time during completions
• Injectivity (psi/bpm)*100- BH Pressure divided by the downhole rate, to determine fracture efficiency and growth.
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Integrating Geology with Completions
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Data Integration – Well Completion Planning
• Mitigate or Prepare for Problem Stageso Gamma Ray, Closure Stress, or any other log
o Completion stage packer/plug depths
• Geometric vs Engineered or a back up plan for tough problematic stages
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