Abstract: Considering the effect of gas slippage, this paper presents a mathematical model of gas flow through low-permeability gas reservoir and finds pseudopressure and pseudotime functions which make the mathematical model and de finite solution condition linearized When the new pseudopressure and pseudotime are used, the model of gas flow through lowpermeabilitygas reservoir becomes the same form as the conventional mathematical model of reservoir permeability. Therefore, when the pseudopressure and pseudotime values is also discussed. It is shown from field examples that the results obtained are satisfactory and the new method is proved to be an effective one for analyzing well test data in low-permeability gas reservoir.

Key words: Gas well test, Low-permeability gas reservoir, Gas flow, Mathematical model