Semi-analytical Solutions for Wellbores with Graded Skin Zones in Poroelastic Media  

作　　者：Zhiqiang Fan Zhihe Jin 

机构地区：[1]School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi’an,710072,China [2]Department of Mechanical Engineering,University of Maine,Orono,ME,04469,USA

出　　处：《Acta Mechanica Solida Sinica》2024年第3期385-395,共11页固体力学学报（英文版）

基　　金：the financial support from Shaanxi Key Research and Development Program under Grant No.2023-YBGY-058;the Fundamental Research Funds for the Central Universities under Grant No.G2020KY05312.

摘　　要：In analyzing the complex interaction between the wellbore and the reservoir formation,the hydromechanical properties of the region proximal to the wellbore,referred to as the“wellbore skin zone”,play a pivotal role in determining flow dynamics and the resulting formation deformation.Existing models of the wellbore skin zone generally assume a constant permeability throughout,resulting in a sharp permeability discontinuity at the skin-reservoir interface.This paper introduces a model for a wellbore with a continuously graded skin zone of finite thickness within a poroelastic medium.Analytical solutions are derived using the Laplace transform method,addressing both positive and negative skin zones.Numerical results are presented to illustrate the effects of graded permeability/skin zone thickness on pore pressures and stresses around a wellbore.The results highlight a distinct divergence in stress and pore pressure fields when comparing wellbores with negative skin zones to those with positive skin zones or no skin at all.

关 键 词：POROELASTIC Graded permeability Analytical solution Wellbore Skin zone 

分 类 号：O17[理学—数学]