Research on Damage Mechanisms and Protection Technologies of Coal Bed Gas Reservoirs

Formation damage is very serious when drilling in coal bed gas reservoirs with characters of low pressure and low porosity, which can seriously affect the success rate of gas reservoir development.In order to enhance the coal bed gas well productivity and increase the development efficiency,it must get rid of reservoir formation damage.The paper introduced the coal bed reservoir features,analyzed its damage mechanisms and pinpointed that the main work on coal bed reservoirs damage control was to protect the cracks.It also summarized the protection technologies such as drilling operations,drilling fluid and fractured stim- ulation treatments.It emphasized that there should pay more attention to research on damage mechanisms and protection technologies so as to enhance develop efficiency of coal bed gas reservoirs.