Shale softening degree and rate induced by fracturing fluid under THMC coupling condition
文献类型：期刊论文
| 作者 | Song, Jinliang4; Xiang, Degui3; Zhao, Shengxian2; Hu, Dawei4; Zhou, Hui4; Zhang, Guoping1 |
| 刊名 | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 96页码:14 |
| 关键词 | Microindentation Coupled thermo-hydro-mechanical-chemical treatment Shale softening Slick water Microstructure characterization |
| ISSN号 | 1875-5100 |
| DOI | 10.1016/j.jngse.2021.104294 |
| 英文摘要 | The shale softening behavior caused by hydrofracturing fluid is of great influence for the fracture conductivity and ultimate recovery of oil and gas from reservoir formations. This paper presents an experimental study on the characterization of a shale after being softened by the coupled thermo-hydro-mechanical-chemical (THMC) treatments that simulate the high-temperature and high-pressure rock-fluid interactions occurring in deep reservoirs during and after hydraulic fracturing. Microindentation tests were conducted to characterize the degradation degree and rate of mechanical properties of THMC-treated samples, and X-ray diffraction (XRD), scanning electron microscope (SEM), and micro-computed tomography (micro-CT) were carried out to analyze compositional and microstructural alterations of samples prior to and after THMC treatment. The results show that Young's modulus, hardness, and fracture toughness degrade significantly upon THMC treatment, and the average softening rate was estimated as 0.13 mm/day. The degradation of mechanical properties of the softened zones is primarily owing to the porous microstructure and crack propagation, resulting from the dissolution of carbonates, pyrite oxidation and the clay mineral osmotic swelling. These findings can provide a good insight of shale-fracturing fluid interactions, phenomenological behavior of shale softening that take place in deep reservoirs at elevated temperatures and pressures, and shed lights on the design, and operation of shale gas exploration. |
| 资助项目 | National Key Research and Devel-opment Program of China[2018YFC0809600] ; National Key Research and Devel-opment Program of China[2018YFC0809601] ; National Natural Science Foundation of China[51779252] ; National Natural Science Foundation of China[52109141] ; China National Petroleum Corporation |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000712091700001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/28354]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Hu, Dawei |
| 作者单位 | 1.Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01003 USA 2.PetroChina Southwest Oil & Gasfield Co, Shale Gas Inst, Chengdu 610000, Peoples R China 3.China Natl Petr Corp, Drilling Res Inst, Beijing 102206, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Jinliang,Xiang, Degui,Zhao, Shengxian,et al. Shale softening degree and rate induced by fracturing fluid under THMC coupling condition[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2021,96:14. |
| APA | Song, Jinliang,Xiang, Degui,Zhao, Shengxian,Hu, Dawei,Zhou, Hui,&Zhang, Guoping.(2021).Shale softening degree and rate induced by fracturing fluid under THMC coupling condition.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,96,14. |
| MLA | Song, Jinliang,et al."Shale softening degree and rate induced by fracturing fluid under THMC coupling condition".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 96(2021):14. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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