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In this study, first the stability of a drilled well for oil production from a reservoir in the Asmary formation region of Iran using a finite different numerical method was assessed. Some sections of various well plunges were done. For each section, displacement, maximum major stresses, safety factor, and plastic zone condition around well using the mentioned numerical method were estimated. According to the results of the programme, summarized that the vertical well in relation to the horizontal well was in a be...