PVT from correlations
Bubble point, solution GOR, Bo, oil and gas viscosity, z-factor and Bg from gravity, temperature and pressure — the module the other reservoir tools call.
Reservoir
Minimum miscibility pressure
CO₂ and lean-gas MMP from three independent correlations, corrected for injectant impurities, with the spread between them shown rather than averaged away.
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How it is calculated
- Cronquist (1978): MMP = 15.988 · T^(0.744206 + 0.0011038·MW_C5+).
- Glasø (1985) and Alston et al. (1985) give two further independent estimates from C7+ molecular weight, temperature and the volatile-to-intermediate ratio.
- Sebastian et al. (1985) corrects for an impure CO₂ stream through the mole-weighted critical temperature of the injectant.
- For nitrogen and lean hydrocarbon gas, Firoozabadi–Aziz is used instead — the CO₂ correlations do not apply to it at all.
Standards it speaks
Where this stops being true
These are correlations on a few hundred slim-tube tests, mostly on North American fluids, and the three of them routinely disagree by twenty per cent or more — which is why this tool shows the spread instead of a single number. None of them know anything about your crude beyond a molecular weight and a temperature. A slim-tube or rising-bubble measurement on the actual fluid and the actual injectant is the only number a project should be designed around; use this to decide whether that test is worth commissioning.
The capability that automates this
Related tools
Volumetric OOIP / OGIP with Monte Carlo
The volumetric equation run tens of thousands of times over triangular distributions, returning P90, P50 and P10 instead of one number that pretends to be certain.
Gas material balance — P/z
Paste reservoir pressure against cumulative production and read gas in place off the intercept, with z computed at every point rather than assumed constant.
EOR method screening
Ten EOR methods checked against your reservoir and fluid properties, each one told to say exactly which criterion rules it out.