Application and evaluation of the well flushing technology with compressed air in CBM wells

In the development of CBM wells on the ground, proppant and coal powder are sedimented because of unreasonable drainage, resulting in blocking wall or fractures, which affects directly the drainage of coabed methane. In order not to affect the sustainable and efficient production, such a well must be cleaned and dredged. Through the preliminary mechanical analysis of the wellbore and fractures, a calculation model of air flushing system for parameter design was given, the equipment and processes of flushing with compressed air in CBM well, the parameters selection and calculation of effect of washing well were.briefly introduced. This technology was used in the group of wells ZM-1 to effectively solve the blockage and low gas production. The success of reverse circulation well washing technology with compressed air in the wells ZM-1 provided a new way for exploring the highly productive and efficient development of CBM wells.