Discussion on technical problems for injection/fall-off well test in the coalbed methane well

Based on the actual application of injection/fall off well test for the coalbed methane exploration and development in China,combined with practical experience for many years,from the view point of application,some technical problems for well test design,process of construction and data analysis are studied and discussed in this paper,it is presented that some suggestions and measures of improvement,and provided important basis for construction of well test in future.