Investigating the effect of skin on the optimization of Coal Bed Methane (CBM) production

Coal Bed Methane (CBM) gas reservoirs have gained increasing attention from the last decades as future alternative energy source. Among the countries that commercially extracted methane from coal beds are USA, Australia, China, India and Canada. Coal is consists of almost pure carbon, and hence the reservoir characteristics is fundamentally different from conventional reservoir. Few studies have been conducted to predict production behaviour of CBM wells in different conditions; gas slippage effect and matrix shrinkage factor. The gas production mechanism from coal seam is significantly different from that of a conventional reservoir. Thorough research need to be conducted to investigate the behaviour of CBM reservoirs. This project will focus on the production behaviour when the formation is damaged or has been stimulated. Mathematical formulation is used in evaluating the skin effect to the well production. It is expected to have different production profiles with different skin values.