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Why acid fracturing is ineffective in carbonate-rich shale reservoirs: From laboratory evidence to field suggestions

文献类型：期刊论文

作者Bi, Zhenhui1,2; Wang, Lei1,2; Yang, Chunhe1,2; Guo, Yintong1,2; Yang, Hanzhi3; Guo, Wuhao1,2
刊名GEOENERGY SCIENCE AND ENGINEERING
出版日期2023-09-01
卷号228页码:17
关键词Carbonate-rich shale Mineral quantitative test Mechanical property Acid corrosion Fracture evolution
ISSN号2949-8929
DOI10.1016/j.geoen.2023.211941
英文摘要Carbonate-rich shale is a newly discovered, promising shale gas reservoir. But field stimulation practice showed that the effect of conventional acid fracturing was very limited. This is what we try to clarify through a comprehensive study. Using downhole cores from a carbonate-rich shale well, mineral quantitative evaluation, acid immersion, and acid corrosion experiments were conducted. Results showed that (1) The surface calcite of carbonate-rich shale was the first to be dissolved by acid; however, acid was blocked by quartz and unable to react with the internal carbonate minerals. (2) High strength was observed in carbonate-rich shale; however, acid immersion slightly weakened the peak deviatoric stress, Young's modulus, and Poisson's ratio by 2.22%, 13.39%, and 2.19%, respectively. (3) Only one acid-induced fracture was connected to the main shear crack under confining pressure, indicating a limited increase in the stimulated volume of this reservoir by acid fracturing. (4) In the carbonate-rich shale, where there was sufficient contact with the acid, the acid exerted a positive effect on fracture propagation; as the acid was consumed, the internal fracture changed insignificantly. The above evi-dence would explain the ineffectiveness of acid fracturing in carbonate-rich shale reservoirs. The stimulation suggestion discussed may bring about better stimulated volumes for carbonate-rich reservoirs.
资助项目National Natural Science Foundation of China[U22B6003] ; National Natural Science Foundation of China[52104010] ; National Natural Science Foundation of China[52104046]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:001047032200001
出版者ELSEVIER
源URL[http://119.78.100.198/handle/2S6PX9GI/39226]  
专题中科院武汉岩土力学所
通讯作者Wang, Lei
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
3.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
推荐引用方式
GB/T 7714		 Bi, Zhenhui,Wang, Lei,Yang, Chunhe,et al. Why acid fracturing is ineffective in carbonate-rich shale reservoirs: From laboratory evidence to field suggestions[J]. GEOENERGY SCIENCE AND ENGINEERING,2023,228:17.
APA Bi, Zhenhui,Wang, Lei,Yang, Chunhe,Guo, Yintong,Yang, Hanzhi,&Guo, Wuhao.(2023).Why acid fracturing is ineffective in carbonate-rich shale reservoirs: From laboratory evidence to field suggestions.GEOENERGY SCIENCE AND ENGINEERING,228,17.
MLA Bi, Zhenhui,et al."Why acid fracturing is ineffective in carbonate-rich shale reservoirs: From laboratory evidence to field suggestions".GEOENERGY SCIENCE AND ENGINEERING 228(2023):17.

入库方式： OAI收割

来源：武汉岩土力学研究所

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