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• W2071566403 abstract "Abstract Applying a suitable enhanced oil recovery method to heavy oil reservoirs is still controversial. Low Tension Polymer Flooding (LTPF) can be considered when thermal and solvent-based methods are not feasible due to technical difficulties and/or economical/environmental constrains. Performance of LTPF, which uses cost-effective surfactant with dilute concentrations within the injected polymer solution, is noticeably far superior to that of alkali-surfactant flooding which suffers from sever viscous instability and/or weak in-situ surfactant generation due to inappropriate acid number of some heavy oils. To properly characterize the microscopic and macroscopic flow behavior of LTPF in heavy oil displacement, the interplay between viscous, capillary, and gravitational forces should be identified by utilizing bond and capillary numbers. Unlike bond number, the capillary number has been defined in several forms by researchers many of which are not equivalent. An appropriate definition of the capillary number should be correctly selected and employed–according to the interest in scale and fluid-flow behavior–so as to quantify the impacts of selected capillary number on the hydrodynamic instability, relative permeability shifts, and phase trapping and bypassing in LTPF in heavy oil displacement. In this study, the capillary number definitions (i.e., pore-scale, Newtonian-fluid, and apparent capillary numbers) were evaluated to determine an appropriate capillary number definition to quantify the LTPF in heavy oil displacement by employing physical modeling and numerical simulation. Moreover, the effects of pore size distribution and injection flowrate on above-mentioned three different capillary number definitions and their sensitivity to the change in those parameters were examined. It was inferred that the sensitivity of change in the pore-scale capillary number is appropriate to evaluate the phase trapping and bypassing whereas the apparent capillary number should be used to characterize the macroscopic behavior (e.g., relative permeability shifts, hydrodynamic instability, and recovery versus capillary number curves) of LTPF. The effects of the pore size distribution and injection flowrate on phase trapping and bypassing, which were rendered, can be considered as a practical guide to build a robust trapping model which is the key to properly simulate and optimize the entire LTPF in lab and field scales." @default.
• W2071566403 created "2016-06-24" @default.
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• W2071566403 date "2009-12-14" @default.
• W2071566403 modified "2023-10-18" @default.
• W2071566403 title "Selection of Proper Criteria in Flow Behavior Characterization of Low Tension Polymer Flooding in Heavy Oil Reservoirs" @default.
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• W2071566403 doi "https://doi.org/10.2118/127606-ms" @default.
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