Software development for stress state analysis around wellbore applied in geomechanical model
Abstract
This paper presents the results of analysing the stress state changes during the drilling process on the basis of data assumptions and analysis of some influential effects of input parameters on the analysis results. Based on theoretical foundations and analytical solutions of stress state equation, named “Kirsch equation”, for the case of wells drilled in rock and with the assumption that the material is elastic, linear and homogeneous, the authors have developed a “W3IPVU” calculation programme using specialised programming language (open source, runs on Linux) which allows analysis of the changes of stress state in any well trajectory given. The reservoir applied to this programme follows the Kirsch hypothesis. The initial results as presented in this paper show the change of the stress field while drilling, which mostly depends on the drilling direction. The increment in tangential stress may be affected by drilling and dependent on the well diameter.
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