Abstract: With consideration of experience of discharge water and gas production in coal bed gas wells，Heshun block in
northeastern Qinshui Basin，we study controlling factors of gas production rate in coal bed gas well in this block from following
aspects：geological factors（structural location，swallow pillar and fault etc.），engineering factors（controlling of fracture height
of hydraulic fracturing，half length of fracture and etc.）and discharge water and gas production factors（rate of delivery，casing
pressure controlling，power off and stop production and etc.）. The conclusions can be drawn：first，gas production in coal bed
gas well is controlled by structural location to large extent. Second，distance between well and actic region and gas content in
coal bed are correlative apparently. Third，hydraulic fracturing in higher structural location is easily subjected to fracturing pay
zone and communication between wells. Fourth，when gas break through，controlling of casing pressure and gas production
rate have some rules. When casing pressure is less than 0.5MPa，the effect is worst；when casing pressure is between 0.5 MPa-
1.0 MPa，the effect better；when casing pressure is greater than 1.0 MPa，the effect is the best. According to the research results，
strategies and advice are put forward to guide future work on the block，which we hope to contribute to future exploration and
development of coal bed gas.

Key words: coal bed gas well, exploit, gas production rate, controlling factor, countermeasure