oa Well testing/Well Design in CBM wells

There are a number of completion options available for successful development of CBM. A number of design factors, with field examples, will be presented in this paper as follows: • a comparison of the performance of horizontal wells with vertical wells; covering the effects of wellbore length, skin factor and coal seam thickness on performance. • the importance of wellbore diameter and geometry and their impact directly on wellbore stability (loss of well/laterals) and production (ability to lift liquids). • the effectiveness of cavity and under-reaming completions compared to fractured wells.