Fault slippage and its permeability evolution during supercritical CO2 fracturing in layered formation
文献类型：期刊论文
| 作者 | Wei, Xiaochen; Zhang, Jingxuan; Li, Qi ; Liu, Xiangjun; Liang, Lixi; Ran, Lili
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| 刊名 | OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
 |
| 出版日期 | 2019 |
| 卷号 | 74页码:- |
| ISSN号 | 1294-4475 |
| DOI | 10.2516/ogst/2019051 |
| 英文摘要 | Understanding the hydromechanical responses of faults during supercritical CO2 fracturing is important for reservoir management and the design of energy extraction systems. As small faults are widespread in Chang 7 member of the Yanchang Formation, Ordos Basin, China, supercritical CO2 fracturing operation has the potential to reactive these undetected small faults and leads to unfavorable fracking fluid migrate. In this work, we examined the role of fault slippage and permeability evolution along a small fault connecting the pay zone and the confining formation during the whole process of fracturing and production. A coupled hydromechanical model conceptualized from actual engineering results was introduced to address the main concerns of this work, including, (1) whether the existence of a undetected small fault would effectively constrain the hydraulic fracture height evolution, (2) what the magnitude of the induced microseismic events would be and (3) whether the permeability change along the fault plane would affect the vertical conductivity of the confining formation and thus increase the risk for the fracturing fluid to leak. Our results have shown that the initial hydrofracture formed at the perforation and propagated upward, once it merged with the fault surface, the existence of an undetected small fault would effectively constrain the hydraulic fracture height evolution. As fracturing continued, further slippage spread from the permeability increase zone of high permeability to shallower levels, and the extent of this zone was dependent on the magnitude of the fault slippage. At the end of extraction, the slip velocity decreases gradually to zero and the fault slippage finally reaches stabilization. In general, undetected small faults in targeted reservoir may not be the source of large earthquakes. The induced microseismic events could be considered as the sources of acoustic emission events detected while monitoring the fracturing fluid front. Due to the limited fault slippage and lower initial permeability, the CO2 fracturing operation near undetected small faults could not conduct preferential pathway for upward CO2 leakage or contaminate overlying shallower potable aquifers. |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000499731500001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/14847]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China; 2.Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Sichuan, Peoples R China; 3.Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wei, Xiaochen,Zhang, Jingxuan,Li, Qi,et al. Fault slippage and its permeability evolution during supercritical CO2 fracturing in layered formation[J]. OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES,2019,74:-. |
| APA | Wei, Xiaochen,Zhang, Jingxuan,Li, Qi,Liu, Xiangjun,Liang, Lixi,&Ran, Lili.(2019).Fault slippage and its permeability evolution during supercritical CO2 fracturing in layered formation.OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES,74,-. |
| MLA | Wei, Xiaochen,et al."Fault slippage and its permeability evolution during supercritical CO2 fracturing in layered formation".OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES 74(2019):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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