Analysis of Hydraulic Fracturing of High Permeability Gas Wells to Reduce Non-darcy Skin Effects

Abstract

Hydraulic f?acturing has become increasingly popular in high permeability gas reservoirs in order to reduce apparent skin and thus improve wellproducttvi@ The remainingpost fracture rate dependent skin effect varies from case to case and it is unclear whether thts is a result of non-Darvflow in thefracture, the reservoir or both This paper presents a stut+ of the eflects of reservoir and fracture turbulence in fractured gas wells. First, a quantification of the fracture length required to eliminate the effects of reservoir turbulence is obtained by means of a numerical study. A similar study with non-Darcy flow in both the reservoir and the fracture results in a correlation of fracture length required to get zero apparent skin at 75% of AOF as a function of reservoir permeability, pressure, fracture conducttvi?v and flfactor.