Method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking

The invention relates to a method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking, belongs to a method suitable for coal bed gas yield increment mining of low-permeability soft coal bed, and mainly solves the technical problems of low gas yield and poor flow conductivity of a conventional coal bed gas mining method. According to the technical scheme, the method comprises the following steps: 1) injecting a drilled gas bleeding well with a pre-ahead fluid-active water through a pump to enable coal bed to generate cracks, wherein the filling pressure is higher than the coal bed fracturing pressure; 2) injecting a sand-carrying fluid; 3) injecting a displacement fluid; 4) stopping the pump for more than 10 minutes, and measuring coal bed pressure drop; 5) injecting a gum breaking agent; 6) filling a displacement fluid. The method has the advantages of long and wide producing gaps, good flow conductivity and high gas yield.