Special Topics & Reviews in Porous Media: An International Journal

PRESSURE BEHAVIOR OF FRACTURED GAS WELLS IN LOW-PERMEABILITY RESERVOIRS WITH THRESHOLD PRESSURE GRADIENT

ABSTRACT

This paper presents analytical solutions to the pressure transient equations of a uniform-flux hydraulically fractured gas well in low-permeability tight formation with threshold pressure gradient. A method to determine the location of the moving boundary front is also presented. This paper concludes that the pseudopressure equipotential lines for a fully penetrating vertical uniform-flux hydraulically fractured gas well are a family of ellipses, whose focii are the two end points of the hydraulic fracture. This paper also concludes that both pressure transient distance in the direction perpendicular to the fracture and pseudopressure drop at the wellbore are approximately linear funcitons of the square root of producing time. Finally, the solution procedure proposed in this paper is a fast tool to evaluate hydraulically fractured well perfomance in a tight gas formation.