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IMECH-IR  > 流固耦合系统力学重点实验室(2012-)  > 期刊论文
Title:
Spontaneous imbibition in asymmetric branch-like throat structures in unconventional reservoirs
Author: Shen YH; Li CX(李曹雄); Ge HK; Yang XY; Zeng XX
Source: JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Issued Date: 2017-08-01
Volume: 44, Pages:328-337
Abstract: 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.
Keyword: Unconventional reservoir ; Spontaneous imbibition ; Fractals
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.jngse.2017.04.022
DOC Type: Article
WOS Subject: Energy & Fuels ; Engineering, Chemical
WOS Subject Extended: Energy & Fuels ; Engineering
WOS Keyword Plus: FRACTAL SANDSTONE PORES ; POROUS-MEDIA ; CAPILLARY IMBIBITION ; WATER IMBIBITION ; FLOW ; MODEL ; PERMEABILITY
WOS ID: WOS:000404304800026
ISSN: 1875-5100
Funder: National Natural Science Foundation of China(U1562215||Science Foundation of China University of Petroleum, Beijing(2462015YQ1202)||Sinopec scientific research project(P15026)||51490652||51604287)
First Institution (Yes or Not): False
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60636
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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Recommended Citation:
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,2017-08-01,44:328-337.
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