关键词: 射孔, 数值模拟, 气井, 非达西流, 有限元法

Abstract: Although many investigation have performed to determine the performance of perforation in an oil well, the study on The performance of perforation in a gas well is fairly poor because of the complexities in the simulation of perforation space, compressibility of gas and non-darcy flow.Based on the partial differential equations and boundary conditions of non-darcy gas flow through perforations and formation,a finite element model was built in this paper.The solution of transfer coefficient Txx, Tyy, Tzz with nondarcy flow in each element was discussed.This paper analyzes the effects of twelve factors on the productivity ratio of a perforated gas well, including factors such as perforation depth, perforation diameter, shot density, phase angle, crushed zone radius, degree of, crushed damage radius of damaged zone, degree of damage, well radius, drawdown, formation permeability and anisotropy.The relative importance of these twelve factors is given.Results of this study show that the performance of a perforation in a gas well differs greatly from that in an oil well.Many properties of perforation in gas well found by this paper are reported for the first time.