Industry Experience of CCS : In Salah

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Industry Experience of CCS In Salah

• Tony Espie, Advisor, CO2 Storage

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In Salah Gas Project
lt0.3 CO2
5-10 CO2
In Salah Gas Project
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In Salah CO2 Re-injection Project
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In Salah CO2 Profile

• Separated (yellow) CO2 stored
• Combustion CO2 (blue) vented

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Krechba Overview
Surface
Vadose
Overburden
Reservoir
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KRECHBA FIELD WITH LANDSAT
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Where is the CO2 going?

• Simple simulation high porosity, does not
  capture lateral heterogeneity or faults/fractures

Saturation Pressure up to
6000psi
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CO2 Injection to mid 2007

• 70 of total produced CO2 injected to date with
  3 injectors on line

• Some injectivity decline due to reservoir
  pressure increase (not decline in injectivity
  index), could be improved with greater WHP.

Re-injected
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Risk Based Approach to Monitoring

• Injection well Ongoing pressure
  monitoring
• Early CO2 Breakthrough Modelling, tracers,
  seismic imaging, observation wells
• Vertical leakage Seismic imaging,
  microseismic, aquifer studies, soil gas
  sampling, surface flux, gravity,
  tiltmeters, satellite imagery
• Wellbore leakage Annulus monitoring, soil
  gas sampling, continuous surface
  monitoring, through casing logging

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Monitoring Technology Prioritization
Low
Microbiology
Flowmeters
Cross-well EM
Surface EM
Aquifer studies
Tiltmeters
Park
Satellite Imaging
Airborne Flux
Cement CO2 work
Dynamic Modelling
Observation Wells
Logging
Surface flux
JIP Benefit
Geochemistry
4D gravity
4D VSP
Geomechanics
Tracers
Annulus Sampling
Optimise
Micro- seismic
Wellhead monitoring
Just Do It
4D Seismic
Wellbore sampling
Soil gas
High
High
Low
JIP Cost
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Questions ?