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Well Testing Toolbox
Interactive Tools
Engineering calculators and conversion utilities for field work.
General Well Testing Calculations
Gas Velocity & Volume (1)
Gas Velocity ($V$):
$$V = \frac{2122 \times B_g \times Q_{mscf}}{d^2}$$ Where $B_g = 0.02833 \frac{Z \cdot T}{P}$Gas Volume (1)
Method 1 (Velocity-Based):
$$Q = \frac{V \times d^2}{2122 \times B_g}$$
$$Q = \frac{V \times d^2}{2122 \times B_g}$$
Gas Volume (2)
Method 2 (Choke/Pressure-Based):
$$Q = P_{psia} \times \left(\frac{d_{64}}{64}\right)^2 \times 24$$
$$Q = P_{psia} \times \left(\frac{d_{64}}{64}\right)^2 \times 24$$
Twin Choke Factor
Equivalent Twin Choke Size:
$$D_{eq} = \sqrt{d_1^2 + d_2^2}$$OIL VOLUME
$$Q_{oil} = \frac{P \times D^{1.89}}{435 \times (GOR/1000)^{0.546}}$$
CORRECTED S.G. @ 60°F
S.G. & API Conversions
API Gravity Conversion:
$$API = \frac{141.5}{SG @ 60^\circ F} - 131.5$$Shrinkage Factor (Standing-Based Table Formula)
$$Bo = 0.9759 + 0.00012 \times F^{1.2}$$
Shrinkage = $1 / Bo$
Well Testing Core Formulas
Gas Velocity ($V$):
$$V = \frac{2122 \times B_g \times Q_{mscf}}{d^2}$$ Where $B_g = 0.02833 \frac{Z \cdot T}{P}$
Method 2 (Choke/Pressure-Based):
$$Q = P_{psia} \times \left(\frac{d_{64}}{64}\right)^2 \times 24$$
$$Q = P_{psia} \times \left(\frac{d_{64}}{64}\right)^2 \times 24$$
Method 1 (Velocity-Based):
$$Q = \frac{V \times d^2}{2122 \times B_g}$$
$$Q = \frac{V \times d^2}{2122 \times B_g}$$
API Gravity Conversion:
$$API = \frac{141.5}{SG @ 60^\circ F} - 131.5$$Equivalent Twin Choke Size:
$$D_{eq} = \sqrt{d_1^2 + d_2^2}$$Temperature Correction Formula:
$$SG_{60} = SG_{obs} + [0.00069 - (0.000372 \times SG_{obs})] \times (T_{obs} - 60)$$
$$API_{60} = \frac{141.5}{SG_{60}} - 131.5$$
Show Parameters & Symbols
| Symbol | Definition | Typical Unit |
|---|---|---|
| $Z$ | Gas Compressibility Factor | Dimensionless |
| $B_g$ | Gas Formation Volume Factor | ft³/scf |
| $GOR$ | Gas-Oil Ratio | scf/bbl |
| $64ths$ | Choke size unit (1/64 of an inch) | Size |
| $BSW$ | Basic Sediment and Water | % |
| $Shrinkage$ | Volume reduction due to gas release | Factor (< 1.0) |