Analysis of typical production mechanism and characteristics of coalbed methane wells for high rank coal in south Qinshui basin

The extraction of coalbed methane(CBM) from wells is a key element of CBM development,whether the measures are right has great impact on productivity and well service life.Lack of technology and experience restricts the CBM development.According to the tracking research of “Pilot Projects of Qinnan CBM Development by Hi-tech Industrialization-Panhe Pilot Test Project”,we got some idea about the gas production mechanism and rules:extraction process of CBM from wells consists of several periods,the period conversion is controlled by water saturation and gas relative permeability;3 gas production peaks exist in CBM wells and the production schedule of the wells for pilot area was set up;which is important for the later production of the other wells in the pilot project and also has demonstration effect for CBM exploitation in other similar basins.