title: Analytical modeling of gas production rate in tight channel sand formation and optimization of artificial fracture.
abstract: Permeability variation in tight channel sand formation makes an important role in gas production. Based on the features of channel sand formation, a mathematical model has been established considering anisotropy of permeability. The analytical solutions were derived for productivity of both vertical wells and vertically fractured wells. Simulation results show that, gas production rate of anisotropic channel sand formation is less than that of isotropic formation. For vertically fractured well, artificial fracture direction, drainage radius, permeability ratio and fracture half-length have considerable influence on production rate. The optimum fracture direction should be deviated less than π/8 from the maximum permeability direction (or the channel direction). In addition, the analytical model was verified by in situ measured data. The research provides theoretical basis for the development of tight channel sand gas reservoirs.
authors.affiliation: College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi China ; Department of Petroleum, Texas A&M University, College Station, TX USA.
authors.forename: Ruifei
authors.initials: R
authors.lastname: Wang
authors.affiliation: Department of Petroleum, Texas A&M University, College Station, TX USA ; School of Civil and Environmental Engineering, University of Science and Technology, Beijing, China.
authors.forename: Hongqing
authors.initials: H
authors.lastname: Song
authors.affiliation: Department of Petroleum, Texas A&M University, College Station, TX USA.
authors.forename: Hewei
authors.initials: H
authors.lastname: Tang
authors.affiliation: Department of Petroleum, Texas A&M University at Qatar, Doha, Qatar.
authors.forename: Yuhe
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Petroleum, Texas A&M University, College Station, TX USA.
authors.forename: John
authors.initials: J
authors.lastname: Killough
authors.affiliation: School of Civil and Environmental Engineering, University of Science and Technology, Beijing, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Huang
keywords: Analytical solution; Channel sand formation; Permeability anisotropy; Tight sandstone gas