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Experimental study on hydrofracture propagation through perforated wellbore in naturally fractured Guanyinqiao calcareous mudstone under true triaxial stress

文献类型：期刊论文

作者Guo, Peng1,2,3; Li, Xiao1,2,3; Yang, Wencheng2,3; Mao, Tianqiao2,3
刊名JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
出版日期2022-03-01
卷号99页码:13
关键词Hydraulic fracturing Guanyinqiao calcareous mudstone Hydrofracture geometry Perforation breakdown mode
ISSN号1875-5100
DOI10.1016/j.jngse.2022.104415
英文摘要Hydraulic fracturing technology has become successful in enhancing the permeability of unconventional gas reservoirs. However, due to the geological complexity, considerable challenges remain in understanding hy-draulic fracturing of calcareous mudstone. In the main production area of shale gas reservoirs in South China, the tight interlayer of Guanyinqiao calcareous mudstone widely spreads in Wufeng-Longmaxi shale, which could heighten the risk of stimulation treatments and hinder fracturing stimulation efficiency. To investigate the characteristics of hydrofracture propagation in naturally fractured Guanyinqiao calcareous mudstone, we con-ducted a series of fracturing tests through perforated wellbore under true triaxial stresses. The features of fracturing treatment pressure curves, effect of stress difference and natural fracture on hydrofracture geometry, perforations breakdown modes, and the distinction between calcareous mudstone fracturing and shale fracturing were analyzed. It revealed that the breakdown pressure of perforated fracturing was lower than that of the open hole fracturing, and a smaller perforation phase angle and higher horizontal stress difference could facilitate the hydraulic fracture initiation. The natural fractures mainly developed along the bedding plane, which could cause step-over or diversion of hydrofracture at weakly cemented bedding interfaces. When horizontal stress difference increased from 4 oa to 8 oa, the propagation orientation of the dominant hydrofracture would change from oblique mode to transverse mode. The rock brittleness and anisotropy significantly influenced fracture geometry. The hydrofracturing in less brittle and anisotropic calcareous mudstone would produce a single dominant ver-tical hydrofracture, by contrast, multiple hydrofractures were prone to initiate from the perforations at a lower injection pressure in brittle shale. The understanding of hydrofracture propagation through perforated wellbore in calcareous mudstone may provide some basic data for gas reservoir fracturing engineering and academic application.
WOS关键词LONGMAXI FORMATION SHALE ; ORGANIC-RICH SHALE ; HYDRAULIC FRACTURES ; NONPLANAR PROPAGATION ; SICHUAN BASIN ; INITIATION ; ACCUMULATION ; ANISOTROPY ; RESERVOIR ; BEHAVIOR
资助项目National Natural Science Foundation of China[42090023] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10030301] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10030304]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:000788674900003
出版者ELSEVIER SCI LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/105152]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Li, Xiao
作者单位1.Peking Univ, Inst Energy, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Peng,Li, Xiao,Yang, Wencheng,et al. Experimental study on hydrofracture propagation through perforated wellbore in naturally fractured Guanyinqiao calcareous mudstone under true triaxial stress[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2022,99:13.
APA Guo, Peng,Li, Xiao,Yang, Wencheng,&Mao, Tianqiao.(2022).Experimental study on hydrofracture propagation through perforated wellbore in naturally fractured Guanyinqiao calcareous mudstone under true triaxial stress.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,99,13.
MLA Guo, Peng,et al."Experimental study on hydrofracture propagation through perforated wellbore in naturally fractured Guanyinqiao calcareous mudstone under true triaxial stress".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 99(2022):13.

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来源：地质与地球物理研究所

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