Experimental study on influencing factors of proppant embedment in Chang6/Chang7 tight reservoir in Huachi area,Ordos Basin
In order to explore the embedment patterns in Chang6 and Chang7 tight reservoirs,XRD mineral analyzer was used to analyze the mineral composition of different lithologies,and DL-2000 acid etching fracture diversion capacity tester was used to analyze the effects of different rock types,single and dual-layered samples,proppant size,sand concentration,and fracturing fluid on embedment depth.In the calculation of embedment depth,the traditional embedding depth calculation method has been improved by sieving the proppant.Spearman correlation analysis was conducted to determine the relative importance of factors influencing embedment depth in the Chang6 and Chang7 formation.The experimental results showed that:1)Clay mineral content increased by 10％,embedding depth increased by 0.005 mm;When the content of brittle minerals increases by 10％,the embedding depth decreases by 0.002 mm,and the influence of clay minerals on the embedding depth is greater than that of brittle minerals;2)The embedment of dual-layered samples is about 1.2 times that of single-layered samples;3)With the increase of proppant size,embedment depth increases,and the 20/40 mesh(Chang6)has the greatest embedment depth,much higher than Chang7;4)With the increase of sand concentration,embedment depth decreases.After the sand concentration exceeds 7.5 kg,embedment depth remains relatively stable;5)Fracturing fluid EM30S has a small effect on proppant embedment depth;6)The factors influencing embedment depth in the Chang7 and Chang6 formation,from high to low,are number of layers,sand concentration,fracturing fluid type,rock type,proppant size,and clay content.
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