Study on Computing Method of Productivity for Single Well in Low-permeability Gas Reservoirs

摘要

The common low-permeability gas well productivity formula is unsuitable for the larger production difference condition. So this paper aims at a new universal gas well productivity formula which can be used at different production difference, and it is deduced by accurately fitting the relationship between the pressure and pseudo pressure using the P.V.T. data of nitrogen. At a small production difference, the results of the new universal gas well productivity formula are basically in accord with the results of the common productivity formula;but at a larger production difference, the results of the former are obviously greater than the latter. According to the actual working condition, the results of the new universal gas well productivity formula are more accord with the field condition.