Frontier Enhanced Oil Recovery (EOR) Research on the Application of Imbibition Techniques in High-Pressure Forced Soaking of Hydraulically Fractured Shale Oil Reservoirs

Shale reservoirs are characterized by low porosity and low permeability, and volume fracturing of horizontal wells is a key technology for the benefits development of shale oil resources. The results from laboratory and field tests show that the backflow rate of fracturing fluid is less than 50%, an...

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Bibliographic Details
Published inGeofluids Vol. 2021; pp. 1 - 17
Main Authors Li, Guanqun, Su, Yuliang, Guo, Yingchun, Hao, Yongmao, Li, Lei
Format Journal Article
LanguageEnglish
Published Chichester Hindawi 2021
John Wiley & Sons, Inc
Hindawi Limited
Hindawi-Wiley
Subjects
Composition
Contact angle
Crude oil
Enhanced oil recovery
Experiments
Field tests
Fractured reservoirs
High pressure
Horizontal wells
Hydraulic fracturing
Imbibition
Mineral composition
Oil
Oil recovery
Oil reservoirs
Oil shale
Oil wells
Permeability
Petroleum mining
Pore size
Porosity
Reservoirs
Scanning electron microscopy
Sedimentary rocks
Shale
Shale oil
Shales
Simulation
Stimulation
Storage
Technology
Viscosity
China
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Summary:Shale reservoirs are characterized by low porosity and low permeability, and volume fracturing of horizontal wells is a key technology for the benefits development of shale oil resources. The results from laboratory and field tests show that the backflow rate of fracturing fluid is less than 50%, and the storage amount of fracturing fluid after large-scale hydraulic fracturing is positively correlated with the output of single well. The recovery of crude oil is greatly improved by means of shut-in and imbibition, therefore attracting increasing attention from researchers. In this review, we summarize the recent advances in the migration mechanisms and stimulation mechanisms of horizontal well high pressure forced soaking technology in the reservoirs. However, due to the diversity of shale mineral composition and the complexity of crude oil composition, the stimulation mechanism and effect of this technology are not clear in shale reservoir. Therefore, the mechanism of enhanced oil recovery by imbibition and the movable lower limit of imbibition cannot be characterized quantitatively. It is necessary to solve fragmentation research in the full-period fluid transport mechanisms in the follow-up research.
ISSN:1468-8115
1468-8123
DOI:10.1155/2021/6634357