四川盆地涪陵地区页岩酸压裂缝渗透率实验

doi:10.11743/ogg20180622

Abstract

Abstract: Volume fracturing is a necessary technical means to realize commercial development of shale gas,but the effectiveness of its stimulation mechanism and various auxiliary production-enhancing measures still needs further exploration.The effects of carbonate content,acid type and concentration and proppant on the permeability of acid-etching shear fractures in shale reservoir were investigated through experiments testing the permeability of acid-etching fractures,and the changes of the microscopic pore throat structures before and after acid etching were studied by CT scanning.The results show that when the carbonate content of shale is about 2%,the best acid etching effect can be obtained by using the mud acid formula of about 11.25% HCl+6.75% HF,while for the shale with a carbonate content of 15%,the acid concentration should be about 7.5% HCl for the best acid-etching effect,and for the shale with a carbonate content of 25%,the acid concentration should be about 2.5% HCl.If natural fractures filled with calcium cements are well developed in shale reservoir,optimal acid concentration should be raised appropriately.Nevertheless,if open natural fractures or fractures filled with calcium cements are not well developed in the shale reservoir,even acid with high concentration cannot drive through the cores due to the extremely low matrix permeability in shale.The experimental results provide more valuable information for the design of effective hydraulic fracturing in shale reservoirs.

Key words: hydraulic fracturing, acid etching, CT scanning, fracture permeability, shale, Fuling area, Sichuan Basin

CLC Number:

TE327

Fang Haoqing, Guo Tiankui, Wang Yang, Zhai Naicheng, Qu Zhanqing. Experimental study of acid-fracturing-induced fracture permeability in shale in Fuling area,Sichuan Basin[J]. Oil & Gas Geology, 2018, 39(6): 1336-1342.

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Experimental study of acid-fracturing-induced fracture permeability in shale in Fuling area,Sichuan Basin

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