STUDY ON ACID FRACTURING TEST OF CARBONATE RESERVOIRS OF WUMISHAN FORMATION IN WESTERN XIAN COUNTY, HEBEI

Qin Xiangxi; Zhang Meng; Wang Guiling; Shi Jiansheng

doi:10.19912/j.0254-0096.tynxb.2021-0152

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 383-391. DOI: 10.19912/j.0254-0096.tynxb.2021-0152

STUDY ON ACID FRACTURING TEST OF CARBONATE RESERVOIRS OF WUMISHAN FORMATION IN WESTERN XIAN COUNTY, HEBEI

Qin Xiangxi^1~3, Zhang Meng³, Wang Guiling¹, Shi Jiansheng⁴

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Abstract

In this paper, the relationship between the factors of rock stress, temperature, acid discharge as well as fracturing mode and the fracturing effect of carbonate rock was discussed through the experimental test of acid fracturing with high rock stress in large size samples and the acid fracturing test under the coupled temperature-stress environment in small size carbonate rock of Wuzhishan formation in western Xian County, Hebei, China, to find the growth law of fracturing fractures in carbonate reservoir, and the main conclusions were drawn as following： Comparing the fracture development with the fracture curves of carbonate rock fracturing in the fractured reservoir, we found that the fracture development of the reservoir rock can significantly reduce the fracture pressure; Fracture activation within the reservoir rock in fracturing tests has a significant effect on the fracture pressure, and the degree of fracture development in the reservoir engineering geology should be considered in the field fracturing process; Acid treatment can significantly reduce the fracture pressure, which is more conducive to the formation of complex fracture networks and induce more acoustic emission events during fracturing; meanwhile, the degree of fracture development in reservoir rocks directly affects the fracturing effect.

Key words

geothermal water resources / carbonates / geothermal wells / acid fracturing / experimental research

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Qin Xiangxi, Zhang Meng, Wang Guiling, Shi Jiansheng. STUDY ON ACID FRACTURING TEST OF CARBONATE RESERVOIRS OF WUMISHAN FORMATION IN WESTERN XIAN COUNTY, HEBEI[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 383-391 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0152

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