The effect of CBM wells fracturing is controlled by multiple factors including geological characteristics of coal reservoir and data of hydraulic fracturing technology

therefore

it’s important to analyze the significance of each factor and determine the main controlling factors affecting the fracturing effect of CBM wells. With reference to the fracturing data from a CBM gas field in China

Apriori association analysis is employed to track the main controlling factors

and in combination of grey correlation method

a new set of identification methods of these factors for the effect of fracturing measures has been put forward. Meanwhile

it is figured out that eight main controlling factors affecting the fracturing effects are in the order as follows: maximum operation displacement of fracturingaverage sand ratiogas saturationgas contenttotal proppant volumetotal fracturing fluid volumesand carrying fluid volumeprepad fracturing volume. Based on this method

different main control factors can be adjusted preferentially with reference to the degree of correlation in fracturing design to control fracturing effect

so as to provide theoretical basis for field application.