Abstract: Based on the steady deliverability equation for water-producing gas wells, a single point deliverability forecasting formula for them is derived. The result shows that compared with conventional gas wells, the empirical parameter in the formula for water-producing gas wells is also related to the water production from gas well, and with the increasing of water/gas mass ratio (RWG), the empirical parameter will decrease gradually and the predicted open flow potential decreases too. In the case study, the single point deliverability forecasting formula for water-producing gas reservoir is established. It is shown that the formula is more reliable and practicable.

Key words: gas well, deliverability, forecast, prediction, formula, equation