On the mitigating environmental aspects of a vertical well in underground coal gasification method

摘要: Underground coal gasification (UCG) is an energy production pathway in underground deposits with the potential advantage of decreasing greenhouse gas emissions during extraction process. The environmental benefits UCG are mainly due to eliminating (i) conventional mining operations, (ii) presence miners underground, (iii) washing and fines disposal, (iv) stockpiling transportation activities. Furthermore, has a capacity great provide clean source by implementing carbon capture storage techniques as part In this method, seams were converted into syngas including hydrogen (H2), monoxide (CO), dioxide (CO2), methane (CH4) gasses advanced thermochemical operation effected significant geomechanical changes overburden strata. process, vertical well (especially well) was affected mechanical stresses thermal stress, induced high temperature. This temperature changed mechanical, thermal, physical properties seam its surrounding rocks (the host rocks), finally causing instability well, while leading serious problems. One these issues possibility leakage environment, resulting water pollution acidification. addition, released could trigger global warming air pollution. research evaluated aspects (production based on stability analysis. Therefore, flow sheet form developed for three-dimensional thermomechanical numerical modeling explicit Lagrangian finite difference method. model, criterion established normalized yielded zone area assess conditions. methodology able all factors that influence selecting suitable mud pressure lining system drilling Hence, when wellbore integrity arose drilling, mitigation strategies applied rectify results demonstrated should be drilled at constant 9 MPa (megapascal), thus minimum provided opportunity impacts identify reliable climate change strategies.