Application of G function to fracturing in Weirong shale gas field
In order to improve the complexity of hydraulic fractures and the post-frac productivity in shale reservoirs of Longmaxi Formation,Weirong gas field,southern Sichuan Basin,the complexity in the previous 15 horizontal wells was evaluated quantitatively and fracturing controls on G function were discussed to make measures against this complexity im-provement.Furthermore,parameters in the following fracturing and a temporary plugging process were determined.Results show that(i)the induced fractures in this field are mostly type Ⅱ complex ones.The fluctuation coefficient of G function is in strongly positive correlation with absolute open flow(AOF).The higher the proportion and complexity of complex frac-tures,the better the post-frac effect;(ii)enlarging fracturing scale and displacement and performing temporary plugging are conducive to the complexity improvement;(iii)the reasonable fracturing-fluid and sanding intensity is 28 m3/m and 2.4-2.6 m3/m,respectively,and the construction displacement shall be increased to over 16 m3/min;(iv)the plugging should be carried out dominantly at the fracture opening and secondarily in the fractures;and(v)the elemental fracturing process formed has been applied to 18 horizontal wells,whose stimulation effect is remarkable with a great increase in the com-plexity and the AOF increased by over 20%.In conclusion,G function is better applicable to evaluating the fracture com-plexity and optimizing technological parameters,and can be used for references on similar gas fields.
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