The Productivity Equation for Slanted Wells in Tight Water-Bearing Gas Reservoirs Considers Multiple Factors

As a highly potential unconventional natural gas resource, accurately evaluating the production capacity of tight sandstone gas reservoirs is of great significance for their development. This article takes inclined wells in tight water bearing gas reservoirs as the research objective, and studies the seepage law of tight water bearing gas reservoirs. Under stable seepage conditions, considering the influence of changes in water saturation on various seepage mechanisms, and considering the influence of different factors such as gas slippage effect, start-up pressure gradient, high-speed non Darcy effect, and skin coefficient in the stimulation and non stimulation zones of fracturing, A new inclined well productivity equation for tight water bearing gas reservoirs has been established and its influencing factors have been analyzed. Comparing the open flow rate calculated by the new production capacity equation with the open flow rate obtained from gas well production capacity testing, the error of the new production capacity equation is smaller, proving that the equation has higher accuracy. This provides a theoretical basis for the production capacity prediction and reasonable production allocation of tight water bearing gas reservoirs.