Abstract: A method includes obtaining, using a computer processor, reservoir data and downtime factors for a well, determining, using the computer processor, an absolute potential flow rate for the well using the reservoir data, uniformly reducing, using the computer processor, an initial productivity index of the well to create a reduced productivity index having a productivity index multiplier, determining, using the computer processor, a relationship between the productivity index multiplier and each downtime factor for the well, and predicting production losses, using the relationship and the computer processor, of a field of wells as a result of the downtime factors.

Abstract: Disclosed are methods, systems, and computer-readable medium to perform operations including generating a material balance plot for a plurality of wells in a gas reservoir. The material balance plot includes, for each of the plurality of wells, respective static pressure/compressibility factor (P/Z) values plotted against cumulative production in the gas reservoir. The operations further include calculating, for each of the plurality of wells, a respective slope of the respective P/Z values plotted against cumulative production. Also, the operations include grouping, based on the respective slopes and locations of the plurality of wells, each well into a respective cluster. Additionally, the operations include designating each respective cluster as a separate compartment in the gas reservoir.