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• W4234844265 abstract "Prediction of Polymer Viscosity Reduction in Pores Using an Exact Depletion Profile Pacelli L.J. Zitha Pacelli L.J. Zitha Delft University of Technology Search for other works by this author on: This Site Google Scholar Paper presented at the SPE European Formation Damage Conference, The Hague, Netherlands, May 2001. Paper Number: SPE-68981-MS https://doi.org/10.2118/68981-MS Published: May 21 2001 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Zitha, Pacelli L.J. Prediction of Polymer Viscosity Reduction in Pores Using an Exact Depletion Profile. Paper presented at the SPE European Formation Damage Conference, The Hague, Netherlands, May 2001. doi: https://doi.org/10.2118/68981-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE European Formation Damage Conference and Exhibition Search Advanced Search AbstractThe modeling and numerical simulation of processes such as polymer placement for water control, fluid loss control during drilling, polymer based chemical flooding and the interpretation of the related laboratory studies need a correct quantification of the apparent viscosity of polymers in porous media.Past experimental and theoretical studies have shown that, in the absence of adsorption, the viscosity of polymer solutions decreases in porous media due to polymer depletion near pore walls. The proposed models considered pores that are relatively large with respect to the thickness of the depletion zones and assumed Newtonian flow. The two fluid model, in particular, is based on a discontinuous concentration profile. These characteristics give rise to limitations in the estimation of the apparent viscosity in porous media with very small pores.In this paper we provide new insights on the depletion effect and develop a new model for the apparent viscosity, taking into account an exact polymer depletion concentration profile and the Non-Newtonian character of the polymer solutions. In this way we are able to predict the lowering of the apparent viscosity in pores over entire ranges of pore radii. Using analytical and numerical hydrodynamic calculations, we investigate the influence of the parameters (polymer concentration, ratio between the thickness of the depletion layer and effective pore radius, velocity gradient, etc.). Model predictions are found to be in good agreement with experiments available in the literature.1. IntroductionPolymers are among the most important components of various oilfield chemicals. In in-depth reservoir processes, such as polymer flooding or alkaline-surfactant-polymer (ASP) flooding, polymers are used mostly for their ability to increase fluid viscosity. This is done in order to create a favorable mobility ratio between oil and the drive fluid.1,2 In drilling fluids, polymers help controlling fluid loss and filtration towards the matrix limiting thereby formation damage.3,4Polymer flow through porous media is a common attribute of polymer or ASP flooding, filtration and many other oil and gas recovery processes. This explains largely the copious amount of work devoted in the last few decades to achieve a better understanding of polymer flow through porous media. In spite of the considerable achievements made in the understanding of polymer flow through porous media, several issues have been only partially resolved. In this paper we revise the problem of the determination of the effective viscosity of a polymer solution during steady state and non-inertial flow in non-adsorbing porous media. This issue is significant because such effective viscosity plays a critical role in various in-depth and near wellbore oil and gas recovery processes, as illustrated above, and in the related laboratory investigations.Several authors5–10 reported in the past that under the above flow conditions the apparent viscosity of the polymer solution is lower than its value measured with a viscometer. In particular, Chauveteau et al.5 showed that the apparent viscosity of polymers decreases with pore size. To do so he used rodlike polymer solutions previously filtered to remove microgels and various siliceous porous packs. Keywords: polymer viscosity reduction, polymer, pore, depletion, viscosity ratio, concentration profile, polymer solution, calculation, polymer length, spe 68981 Subjects: Improved and Enhanced Recovery, Chemical flooding methods This content is only available via PDF. 2001. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4234844265 title "Prediction of Polymer Viscosity Reduction in Pores Using an Exact Depletion Profile" @default.
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