Gas volume at standard conditions
Gas volume at 20 °C and 101.325 kPa (GOST 2939) from the volume at operating pressure and temperature, with the deviation factor; the gas formation volume factor. The same works for a flow rate: actual m³/h give standard m³/h.
V_st = V · (P / P_st) · (T_st / T) / ZP_st = 0.101325 MPa; T_st = 293.15 KB_g = V / V_stThe standard conditions in Kazakhstan are 20 °C and 101.325 kPa (GOST 2939); the unit switch converts the result to m³ at 15 °C, Nm³ at 0 °C or scf. Z is taken at the operating pressure and temperature.
Source: Real-gas equation of state P · V = Z · n · R · T; standard conditions — GOST 2939-63
Inputs
You can change a field's unit: the value is converted to the formula's units automatically.
The geometric volume of a vessel, or the reading of an actual-volume meter.
A gauge reads gauge pressure — choose the MPa(g) unit and 0.101325 MPa is added.
At the operating P and T — from the gas composition (Standing-Katz) or PVT data; up to 0.5 MPa take 1.
Unit converter for this formulaLiquid volume · Pressure · Temperature · Gas volume · Gas formation volume factor
- m³1
- 10³ m³0.001
- 10⁶ m³1·10⁻⁶
- L1,000
- bbl6.28981
- Mbbl0.00628981
- MMbbl6.28981·10⁻⁶
- ft³35.3147
- US gal264.172
- B_g — Gas formation volume factor–
More in Gas and chokes
Liquid rate of a flowing well at critical two-phase flow through the choke, from the tubing head pressure, the gas-liquid ratio and the choke size: the Gilbert, Ros, Baxendell and Achong correlations.
The choke size that gives a target liquid rate of a flowing well at a known tubing head pressure and gas-liquid ratio (critical flow).
The critical gas velocity that lifts water or condensate droplets out of the well, and the matching minimum gas rate for a given tubing size — after Turner (with the +20 % adjustment) or Coleman (without it). Below this rate liquid accumulates at the bottom and loads the well up.
Results are engineering estimates from standard formulas; for design decisions check them against the codes, project documents and specialists' calculations. The formulas carried over from the original set are unchanged, and their errors are described in the notes.