Predictive IPR Calculator

The predictive IPR calculator is used to calculate inflow performance relationships at various points in time over the life of the well.

Current

Variables under the current header are all variables measured at current conditions.

Pump TVD

True vertical depth of the bottom hole pump, which is the vertical distance from surface to the bottom hole pump.

Bottom Perf TVD

True vertical depth of the bottom hole pump, which is the vertical distance from surface to the mid point of the perforations.

Water Specific Gravity

Density of the produced water relative to pure water.

Oil API Gravity

Density of the produced oil measured in degrees API gravity.

Fluid Above Pump Static

Stabilized vertical height of the column of fluid above the bottom hole pump in static conditions (not producing).

Shut-in Casing Pressure Static

Stabilized casing pressure measured at surface, with the well shut in and in static conditions (not producing).

Fluid Above Pump Producing

Stabilized vertical height of the column of fluid above the bottom hole pump when the well is producing.

Casing Pressure Producing

Stabilized casing pressure measured at surface when the well producing.

Daily Oil

Daily oil production measured in barrels per day.

Daily Water

Daily water production measured in barrels per day.

Daily Gas

Daily gas production measured in thousands of standard cubic feet per day.

Target

Variables under the target header are not reflective of current conditions, rather they are select set of future or planned conditions.

Reservoir

Variables under reservoir are all parameters that define the characteristics of the reservoir.

Cumulative Probability for Analysis

Is an estimated reservoir pressure percentile used for analysis based on a probability distribution. For example, P50 uses the 50th percentile, meaning that a reservoir pressure value is used where 50% of reservoir pressures would fall below that value and 50% would fall above; P90 uses the 90th percentile, meaning that a reservoir pressure value is used where 90% of reservoir pressures would fall below that value and 10% would fall above.

Initial Reservoir Pressure

The pressure of the reservoir before production commenced.

Abandonment Reservoir Pressure

The anticipated pressure of the depleted reservoir that would warrant abandonment of the well.

EUR Oil

EUR is the estimated total oil recovery from the well, which is the cumulative oil production over the life of the well.

Cumulative Oil to Date

The total volume of oil that the well has produced from commencement of production to the current date.

Bubble Point Pressure

The pressure at which the first bubble of gas comes out of solution at reservoir temperature.

Daily Oil Increase

The calculated increase in daily oil production from current conditions to target conditions.

Daily Water Increase

The calculated increase in daily water production from current conditions to target conditions.

Daily Gas Increase

The calculated increase in daily gas production from current conditions to target conditions.

Daily Liquid

Daily combined oil and water production in barrels per day.

Dimensionless Oil Recovery

The ratio of total recovered oil to the total recoverable oil.

Calculated Reservoir Pressure

Calculated reservoir pressure at current conditions.

P50 Estimated reservoir Pressure

The estimated probable reservoir pressure which will fall in the 50th percentile of reservoir pressures.

P10 Estimated reservoir Pressure

The estimated probable reservoir pressure which will fall in the 10h percentile of reservoir pressures.

P90 Estimated reservoir Pressure

The estimated probable reservoir pressure which will fall in the 90th percentile of reservoir pressures.

Well Flowing Pressure

The calculated bottom hole flowing pressure at current conditions.

Pwf

Well flowing pressure associated with the production values in the same row of the output table.

Oil Rate

The daily oil production rate at the well flowing pressure value in the same row of the output table.

Water Rate

The daily water production rate at the well flowing pressure value in the same row of the output table.

Gross Rate

The daily combine oil and water production rate at the well flowing pressure value in the same row of the output table.

Pwf After

The well flowing pressure at target conditions.

Pwf Before

The well flowing pressure at current conditions.

P/Pmax

Is a ratio of the well flowing pressure relative to the maximum possible well flowing pressure.

Q/Qmax

Is a ration of the gross flow rate relative to the maximum possible flow rate.