Research on Drainage System and Complementary Technique for Coalbed Methane Well

According to the problems of short-term production period and low production rate and inaccuracy production data which caused by unreasonable gas pr oduction program and imperfect gas production technique of coalbed methane wells,this paper explored a five-step system based on 45 wells project practice. Sand co ntrol and anti-airlock pump for discharge and production technology in deviation wells,as well as electronic pressure gauge recording directly technology in surface and supporting technology of balling with sand pump were established. The results showed that five-step system for production system increased the gas production step by step,and production rate were over 16 000 m3per day. Due to optimized producing technologies,production period was extended from 224 days to 353 days.