Productivity index for a gas well, abbreviated as \(J\), is a measure of the well's ability to produce gas relative to the pressure drawdown (the difference between the reservoir pressure and the flowing bottom-hole pressure). It is an important in reservoir engineering, used to evaluate the performance and efficiency of a gas well.
Key Points about Productivity Index
Gas Flow Rate - This is the rate at which gas is being produced from the well.
Reservoir Pressure - This is the pressure within the reservoir.
Flowing Bottom-Hole Pressure - This is the pressure at the bottom of the well when gas is flowing.
Productivity Index Usage
Evaluating Well Performance - A higher \(J\) indicates a more productive well for a given pressure drawdown.
Well Comparison - \(J\) allows for the comparison of different wells within the same reservoir or across different reservoirs.
Reservoir Management - Helps in planning the development and production strategies for a gas field.
