CO2 Injection Well Deliverability

Convert injectivity test results into expected CO2 throughput by applying the available pressure window, safety margin, and in-situ density.

Maximum planned surface injection pressure or wellhead tubing pressure in bar.
Formation pressure limit or fracture gradient converted to bar at reservoir depth.
Measured volumetric injectivity of the wellbore based on step-rate testing.
Optional. Defaults to 650 kg/m^3 reflecting dense-phase CO2 in saline formations.
Optional percentage reduction applied to the pressure window to preserve operating headroom.

Subsurface engineering aid—validate pressure limits, skin factors, and density assumptions with reservoir simulations before committing to injection schedules.

Examples

  • 210 bar surface pressure, 170 bar reservoir limit, 18 m^3/day per bar injectivity, 650 kg/m^3 density, 5% safety margin ⇒ Deliverability: 684.00 m^3/day (≈ 444.60 tonnes/day).
  • 185 bar surface pressure, 160 bar reservoir limit, 12 m^3/day per bar injectivity, 720 kg/m^3 density, safety margin blank ⇒ Deliverability: 285.00 m^3/day (≈ 205.20 tonnes/day).

FAQ

How do I obtain the injectivity index?

Derive it from step-rate or falloff testing by dividing the stabilized volumetric rate by the net pressure differential between injection pressure and formation limit.

Can I use bottom-hole pressures instead of surface pressures?

Yes—use consistent depths. If you input bottom-hole values, ensure the pressure window reflects downhole measurements and adjust injectivity accordingly.

What density should I assume before full compositional modelling?

Dense-phase CO2 in saline aquifers typically ranges from 600 to 750 kg/m^3 at 80–120 bar and 40–60 °C. Update the density once reservoir simulations provide refined values.

Does the calculator handle multiple wells in a pad?

Calculate deliverability per well and sum the tonnes per day for a pad-level view. Ensure the shared reservoir pressure limit reflects interference between wells.

Additional Information

  • Result unit: volumetric throughput in cubic metres per day and mass throughput in tonnes per day of CO2.
  • Safety margin defaults to 5% when left blank to preserve operational headroom below the fracture limit.
  • Injectivity index should reflect stabilized test data with skin effects incorporated; adjust inputs if stimulation is planned.

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