CO₂/H₂S Phase, Density, & Injection Pressure for UIC Class II Disposal
CO₂/H₂S phase envelope, dense-phase advantages, MR0175 tubing materials, water saturation & hydrate risk, induced seismicity.
Mixture critical point (Kay's rule):
Pure-component criticals (for reference):
| Species | Tc (°F) | Pc (psia) | MW |
|---|---|---|---|
| CO₂ | 88 | 1,071 | 44.01 |
| H₂S | 213 | 1,306 | 34.08 |
| CH₄ | −116 | 667 | 16.04 |
| H₂O | 705 | 3,200 | 18.02 |
Phase classification:
Gas: Tr > 1, Pr < 1 | Dense-phase: Tr > 1, Pr > 1 | Liquid: Tr < 1, Pr > 1
Hydrostatic head (compressible):