| Spontaneous imbibition in asymmetric branch-like throat structures in unconventional reservoirs |
| Shen YH; Li CX(李曹雄); Ge HK; Yang XY; Zeng XX; Li, CX (reprint author), China Univ Petr, Unconvent Nat Gas Inst, Beijing 102249, Peoples R China.
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| 发表期刊 | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
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| 2017-08-01
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| 卷号 | 44页码:328-337 |
| ISSN | 1875-5100
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| 摘要 | Unconventional reservoirs, especially shale plays, have abundant micro nano pores. Large volume water was injected into the reservoir during hydraulic fracturing. Fracturing fluid can displace gas in pore spaces spontaneously, called spontaneous imbibition (SI), which has significant effects on the gas production after hydraulic fracturing. Throat structure in matrix is one of the key factors to influence SI process. In this work, at first, complex pore space is simplified as a spatial self similar branch like structure composed of several asymmetric sub throats. Then, within asymmetric branch structure, the imbibition process is calculated by a newly established mathematical model, and the influence of both pore structure and fluid characteristics, including contract angle, viscosity, surface tension, are discussed. Finally, some lab experiments, especially SI tests, are included on shale and sandstone core plugs to verify our model. Results show that the coherence in wettability between the reservoir and the fracturing fluid is important to enhance the microscopic replacement effect. Pore size also has effect influence on imbibition curve. In addition, both in models and experiments, imbibition index n is useful to describe imbibition properties of rocks. In unconventional rock samples like shale, n is less than 0.4, while high permeability sandstone, n approach to 0.5. These conclusions are useful to investigate the mechanism of spontaneous imbibition and microscopic displacement in unconventional reservoirs. (C) 2017 Elsevier B.V. All rights reserved. |
| 关键词 | Unconventional Reservoir
Spontaneous Imbibition
Fractals
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| DOI | 10.1016/j.jngse.2017.04.022
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000404304800026
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| 关键词[WOS] | FRACTAL SANDSTONE PORES
; POROUS-MEDIA
; CAPILLARY IMBIBITION
; WATER IMBIBITION
; FLOW
; MODEL
; PERMEABILITY
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| WOS研究方向 | Energy & Fuels
; Engineering
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| WOS类目 | Energy & Fuels
; Engineering, Chemical
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| 项目资助者 | National Natural Science Foundation of China(U1562215||Science Foundation of China University of Petroleum, Beijing(2462015YQ1202)||Sinopec scientific research project(P15026)||51490652||51604287)
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| 论文分区 | 二类
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| 力学所作者排名 | 2
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/60636
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| 专题 | 流固耦合系统力学重点实验室
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| 通讯作者 | Li, CX (reprint author), China Univ Petr, Unconvent Nat Gas Inst, Beijing 102249, Peoples R China. |
推荐引用方式
GB/T 7714 |
Shen YH,Li CX,Ge HK,et al. Spontaneous imbibition in asymmetric branch-like throat structures in unconventional reservoirs[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2017,44:328-337.
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| APA |
Shen YH,李曹雄,Ge HK,Yang XY,Zeng XX,&Li, CX .(2017).Spontaneous imbibition in asymmetric branch-like throat structures in unconventional reservoirs.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,44,328-337.
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| MLA |
Shen YH,et al."Spontaneous imbibition in asymmetric branch-like throat structures in unconventional reservoirs".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 44(2017):328-337.
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