Numerical simulation of factors affecting the migration of hydraulic fracturing proppants in tight gas reservoirs
The placement of proppants in hydraulic fracturing fractures of tight gas reser-voirs directly affects the conductivity of the fractures,which in turn affects the post fractur-ing productivity.Based on the Euler-Euler method,a CFD fluid dynamics numerical simu-lation model was established to analyze the effects of displacement,sand ratio,proppant par-ticle size and density,and combined sand addition factors on the transport law and place-ment characteristics of proppants.The results showed that in the guanidine gum fracturing fluid system,the increase in proppant filling height was not significant when the displace-ment was greater than 3.5 m3/min and the sand ratio was higher than 25%.The effect of proppant density on the distribution of proppants within the seam is relatively small.It is recommended to use smaller particle size proppants and increase the amount of sand added to the combination sand,which is beneficial for the uniform height of the sand embankment in the cracks,thus forming a larger sand laying area.The research results optimized the fracturing construction parameters and provided important guidance for the design of hy-draulic fracturing sand addition.
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