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- W3140906096 abstract "Naturally fractured carbonate reservoirs (NFCRs) are strategic resources for the long-term world oil supply. However, worldwide production from NFCRs is substantially less than 1 per cent of the total oil production. The oil industry was not interested in these types of reserves until recently because they contain less oil than typical sandstone reserves, and in particular the tar sands of Canada and Venezuela. Also, carbonate rocks have complex interrelationships between porosity, permeability and other reservoir properties. In addition, their heterogeneity makes application of current technologies very challenging. In order to recover highly viscous bitumen or extra-heavy oil from NFCRs, the viscosity must be reduced by either heating, dilution, or reducing the molecular weight. Thermal processes such as steam flood, steam drive, cyclic steaming, steam-assisted gravity drainage (SAGD) and hybrid methods are the main commercialized technologies used for heavy oil exploitation. However, there are few cases where thermal processes are successfully implemented for heavy oil production from NFCRs. The thermal technologies were reviewed with particular focus on formation deformation, shear dilation, stress changes, carbonate rock decomposition, permeability changes, oil swelling, carbon dioxide dissolution and thermally induced wettability alterations which occur in NFCRs at elevated temperature during thermal oil exploitation processes. It was concluded that there is insufficient experience to provide definitive results and recommendations for optimal heavy oil production methods in NFCRs. This review provided insight into some ideas and experiments by field researchers that may stimulate further research in this challenging area. A simple 2D numerical model in a poroelastic oil-saturated reservoir was used to illustrate a few coupled stress-heat-flow effects related to hot liquid injection into NFCRs." @default.
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- W3140906096 date "2009-07-01" @default.
- W3140906096 modified "2023-09-23" @default.
- W3140906096 title "Thermal effects in fractured carbonates at elevated temperature" @default.
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