As a new field of unconventional natural gas exploration and development

deep coalbed methane（CBM） has great resource potential

but its benefit development faces great challenges. How to carry out efficient development is a problem needed to be solved at present. In order to achieve stable production and steadily promote the expansion of the gas field

focusing on how to realize the problem of “long fracture and far support” in reservoir reconstruction

Yanchuannan gas field has achieved good results through fracturing optimization and tackling key problems of deep coalbed methane geology-engineering integration. The research shows that: ①Deep CBM has great resou

rce potential with a high gas content of 13~20 m

3

/t

but it is difficult to develop and transform the reservoir and the daily production of single well is low

only of 0~500 m

3

/d; ②According to the underground observation

in the existing active hydraulic fracturing technology

the effective supporting seams mainly distributes within eight meters of the wellbore

and the main fracture extension is generally less than 30 m; ③Deep coal seam fracturing should take the large-scale artificial fracture with long-distance support and high conductivity as the main target to improve the sand adding strength with large displacement

and at the same time develope “low density and long migration” proppant. The average daily gas production of single well is 1 800 m

3

. It provides a new idea for the deep CBM development.