Low-velocity Non-Darcy Gas Seepage Model and Productivity Equations of Low-permeability Water-bearing Gas Reservoirs
含水低渗气藏低速非达西渗流数学模型及产能方程研究

The flow behaviour of fluids in water-bearing gas reservoirs was analyzed based on the experimental study of low\|velocity non\|Darcy percolation. Three kinds of mathematical models were established under the influences of movable water, inmovable water and combined water. Deliverability equations of gas well were obtained with the gas slippage effect and the threshold pressure gradient existed respectively and simultaneously. The case study proved that the study was applicable and the corresponding equations could provide a necessary theoretical basis for defining reasonable gas\|well deliverability under different water conditions.