Live Engineering Dashboard

Well Testing Toolbox

Interactive Tools

Engineering calculators and conversion utilities for field work.

Advanced Well Test Calculator

Oil Data (F-Series)

Gas Data (L-Series)

Field Guide: Flow Rate Calculations

1. Corrected Oil Rate ($Q_o$)

The calculator determines the net clean oil at standard conditions ($60^\circ F$) using the following logic:

$$V_{net} = (Meter_{curr} - Meter_{prev}) \times MF \times Sh \times (1 - BSW)$$ $$Q_o = V_{net} \times \left( \frac{1440}{Interval} \right) \times C_{tl}$$
  • $C_{tl}$: Volume correction factor for temperature based on API gravity.
  • BS&W: Basic Sediment and Water percentage (deducted from gross).
  • Shrinkage ($Sh$): Adjusts for volume loss due to gas breakout.

2. Gas Flowrate ($Q_g$)

Based on the AGA-3 Orifice standard, calculating the volume through the meter run:

$$Q_g = C' \sqrt{P_f \times h_w}$$ $$C' = F_b \times F_{tf} \times F_g \times F_{pv}$$
  • Static Press ($P_f$): Measured in PSIA (Gauge + 14.73).
  • Diff. Press ($h_w$): Differential across the plate in inches of $H_2O$.
  • Gravity ($F_g$): Adjusts for the density of the gas relative to air.

Workflow Instructions

STEP 1

Input Oil Meter delta and the Interval time between readings.

STEP 2

Enter Orifice Size and Line Pressures for the gas calculation.

STEP 3

Review the GOR to ensure the well is flowing above bubble point.

Critical Factor: Ensure your Hydrometer Temp and Line Temp are accurate. The calculator uses a non-linear $e$ expansion ($Math.exp$) to correct volume, which is highly sensitive to temperature fluctuations.