Abstract: The open flow potential from one-point method for calculation of gas well deliverability tends to be larger than that from the deliverability equation, and the result is irregular. The study shows that only giving one value of alpha in calculation must cause big error. The alpha value can be obtained by shut-in well pressure build-up test and available formation parameters, thus the open flow potential of a gas well given by one-point deliverability equation is more accurate.

Key words: gas well, productivity, deliverability, equation, formula, open flow potential, open flow capacity. one-point method