Study on fracturing fluid suitable for sand fracturing in underground coal mines
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Wang Kai, Zhou Junjie, Jiang Hecai
Along with the coal mine development extends to the deep, the ground stress gradually increases, conventional water hydraulic fracturing usually occurs fracture re-closure after fracturing. In order to improve the gas extraction effect, using hydraulic fracturing and sand adding technology, optimizing clean fracturing fluid suitable for sand fracturing in underground coal mine, evaluating the ability of suspending sand, carrying sand, anti-swelling. The damage rate of the fracturing fluid system to the coal core is 15.62%, proppant does not settle in fracturing fluids, it shows excellent properties of high suspended sand, high carrying sand and low damage, it is suitable for hydraulic fracturing and sand adding construction of underground coal mine with low displacement and high sand ratio.
Coal mine, gas drainage, sand fracturing, clean fracturing fluid