Practical calculator programs. Part 1. Gas-well deliverability determined

A program to determine gas well deliverability using the TI-59 handheld calculator has been developed. Based on data obtained from a back pressure curve, volumetric data, and a cumulative vs. P/Z curve, the program schedules future annual production. Input data consist of the original gas in place, initial Po/Zo, slope of the back pressure curve, cumulative production, current surface flowing pressure, current rate, and the pipeline pressure. A range of pressure points and equivalent P/Z's over which scheduling will be made is input. To calculate formation pressure conversion factor, the gas gravity, depth of formation, surface temperature, and formation temperature are entered. Conversion of surface flowing pressure to formation pressure is then accomplished. An iteration procedure is used to schedule annual production.