IMECH-IR  > 流固耦合系统力学重点实验室
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.
Source PublicationJOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
2017-08-01
Volume44Pages:328-337
ISSN1875-5100
AbstractUnconventional 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.
KeywordUnconventional Reservoir Spontaneous Imbibition Fractals
DOI10.1016/j.jngse.2017.04.022
Indexed BySCI ; EI
Language英语
WOS IDWOS:000404304800026
WOS KeywordFRACTAL SANDSTONE PORES ; POROUS-MEDIA ; CAPILLARY IMBIBITION ; WATER IMBIBITION ; FLOW ; MODEL ; PERMEABILITY
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(U1562215||Science Foundation of China University of Petroleum, Beijing(2462015YQ1202)||Sinopec scientific research project(P15026)||51490652||51604287)
Classification二类
Ranking2
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60636
Collection流固耦合系统力学重点实验室
Corresponding AuthorLi, CX (reprint author), China Univ Petr, Unconvent Nat Gas Inst, Beijing 102249, Peoples R China.
Recommended Citation
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.
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.
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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