Journal
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
Volume 161, Issue -, Pages 683-691Publisher
ELSEVIER
DOI: 10.1016/j.petrol.2017.11.049
Keywords
Multiphase flow; Non-Newtonian fluid; Diversion effect; Lattice Boltzmann method; Porous media; Enhanced Oil Recovery (EOR)
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Funding
- NSF grant of China [51676107, U1562217]
- National Science and Technology Major Project on Oil and Gas [2017ZX05013001]
- PetroChina Innovation Foundation [2015D-5006-0201]
- Tsinghua University Initiative Scientific Research Program [2014z22074]
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Non-Newtonian fluids are widely applied in Enhanced Oil Recovery (EOR) techniques, and the good performances have been ascribed to the shear-thinning or shear-thickening characteristics of them. In this paper, we aim at discovering the roles of these rheological properties in non-Newtonian fluid displacement from the pore scale. A recently developed lattice Boltzmann model (LBM) for multiphase viscoplastic fluid flow [ Xie et al. J Non-Newton Fluid, 2016.234: 118-128] is used. Displacements in both homogeneous and heterogeneous porous media are considered. For homogeneous cases, the performances of shear-thinning and shear-thickening fluids are almost the same when compared in favorable displacement regime; while the performance of shear-thinning fluid is poorer than that of shear-thickening fluid in unfavorable displacement regime. For heterogeneous cases, we demonstrate that the shear-thinning property does not contribute too much to the diversion effect, which clarifies the debate of understandings. Our pore-scale modeling results also indicate the significance of low viscosity ratio for diversion and EOR, which can stabilize the displacing front despite of the increased viscous resistance.
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