Production and Well Parameters
This page defines the production, well, downhole, and derived parameters used by ESP-GUARDX. The table is based on the approved parameter workbook and should be treated as the source of truth when other manual text is ambiguous.
| Symbol |
Parameter |
Source |
Definition / Formula |
Notes |
Qflow |
Flow Rate |
Sensor (Modbus) |
Instantaneous fluid flow rate measured at the wellhead or downhole. |
Base variable for volume calculations. |
fw |
Water Cut Fraction |
Sensor / User Input |
Fraction of water in the produced fluid. |
From the multi-phase meter (Mmulti) or lab data. |
fo |
Oil Cut Fraction |
Sensor / User Input |
Fraction of oil in the produced fluid. |
From the multi-phase meter (Mmulti) or lab data. |
fg |
Gas Fraction |
Sensor / User Input |
Fraction of gas in the produced fluid. |
If not directly measured, calculate as 1 - fw - fo. |
Mmulti |
Multi-Phase Meter |
Sensor / User Input |
Device providing real-time phase fractions such as fw and fo. |
Used to separate total flow into oil, water, and gas components. |
Production Calculations
| Symbol |
Parameter |
Source |
Definition / Formula |
Notes |
Vfluid |
Incremental Fluid Volume |
Calculated |
Vfluid = integral(Qflow dt) ~= Qflow x delta_t_running |
Calculates produced volume over a time step. |
Vw_day |
Daily Production (Water) |
Calculated |
sum(Vfluid x fw) over a 24-hour period. |
Accumulates daily water volume. |
Vo_day |
Daily Production (Oil) |
Calculated |
sum(Vfluid x fo) over a 24-hour period. |
Calculates oil volume directly from total fluid and oil fraction. |
Vg_day |
Daily Production (Gas) |
Calculated |
sum(Vfluid x fg) over a 24-hour period. |
Calculates gas volume from gas fraction. |
Vliq_day |
Daily Production (Total Liquid) |
Calculated |
Vw_day + Vo_day |
Total liquid production, excluding gas. |
Cumfluid |
Total Cumulative Fluid |
Calculated |
sum(Vfluid) from well startup to current moment. |
Running total fluid production. |
Cumw |
Total Cumulative Water |
Calculated |
sum(Vfluid x fw) from well startup. |
Running water total. |
Cumo |
Total Cumulative Oil |
Calculated |
sum(Vfluid x fo) from well startup. |
Running oil total. |
Cumg |
Total Cumulative Gas |
Calculated |
sum(Vfluid x fg) from well startup. |
Running gas total. |
Rsurface |
Surface Oil Rate |
Sensor (Modbus) |
Actual oil flow rate measured at the surface. |
Used to calibrate downhole estimates. |
RtotalDH |
Total Downhole Rate |
Modbus |
Fluid rate converted to downhole conditions using PVT correction. |
Used when comparing surface rate against downhole conditions. |
Pressure, Temperature, and Downhole Sensors
| Symbol |
Parameter |
Source |
Definition / Formula |
Notes |
Pwell |
Wellhead Pressure |
Sensor (Modbus) |
Surface pressure at the wellhead. |
Supply-side surface pressure reference. |
Pintake |
Intake Pressure |
Sensor (Modbus) |
Downhole pressure at the pump intake. |
Used for pump intake and drawdown checks. |
Pdischarge |
Discharge Pressure |
Sensor (Modbus) |
Downhole pressure at the pump discharge. |
Used with intake pressure to assess pump lift. |
Pdrawdown |
Pressure Drawdown |
Calculated |
Preservoir - Pintake |
Requires a static reservoir pressure estimate. |
Tcasing |
Casing Temperature |
Sensor (Modbus) |
Temperature in the casing annulus. |
Surface/well integrity indicator. |
Ttubing |
Tubing Temperature |
Sensor (Modbus) |
Temperature inside the production tubing. |
Production-flow temperature reference. |
Tintake |
Intake Temperature |
Sensor (Modbus) |
Downhole fluid temperature at pump intake. |
Pump intake condition. |
Tmotor |
Motor Temperature |
Sensor (Modbus) |
Internal temperature of the ESP motor. |
Motor thermal condition. |
Vvib |
Vibration (x, y axes) |
Sensor (Modbus) |
Radial vibration of the downhole equipment. |
Used for mechanical health checks. |
Ileak |
Current Leakage |
Calculated / Sensor |
Sensed ground fault or calculated leakage current. |
Used for insulation and ground-fault monitoring. |
Derived Health and Operating Metrics
| Symbol |
Parameter |
Source |
Definition / Formula |
Notes |
Lmotor |
Motor Load (%) |
Calculated |
Derived by cross-referencing power with motor and pump performance curves. |
Used by motor load and operating-envelope views. |
Cpower |
Power Consumption |
Calculated |
Integration of active power over time, in kWh. |
Used for energy and production-efficiency summaries. |
Reff |
Efficiency Ratio |
Calculated |
Hydraulic power out / electrical power in. |
Converts electrical input and hydraulic output into an efficiency indicator. |
Shealth |
Health Score |
Calculated (AI) |
Predictive maintenance score based on historical and real-time data. |
Drives the dashboard health gauge. |
Drun |
Total Running Days |
Calculated |
Sum of days where Motor Status = ON. |
Used for running-time summaries. |
Dfail |
Total Failure Days |
Calculated |
Sum of days where Motor Status = FAULT. |
Used for reliability and downtime summaries. |
Implementation Notes
- Use
Qflow as the base for fluid-volume calculations.
- Do not calculate oil and gas production by subtracting water from total production unless the oil and gas fractions are unknown. Use
fo and fg directly when available.
- Treat
Vliq_day as total liquid only. Gas is tracked separately through Vg_day and Cumg.
Pintake is the pump-intake pressure. Avoid using "bottomhole pressure" as a substitute unless the installation maps that value specifically to the pump intake.Shealth is a predictive maintenance score, not a direct sensor measurement.