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Abandoned oil and natural gas wells can pose a serious risk, mainly associated with uncontrolled oil spills and natural gas leakage due to imperfect sealing. In order to make the right decision for the need for repeated disposition of borehole, it is essential to have a functional, general, but sufficiently simple method of risk assessment. Certified methods for risk analyses used by Czech governmental institutions as well as other open methods available in literature were analysed and significant gaps recognised,...