Abstract
The impact of shear on the properties of polymer solutions is not fully accounted for in the simulation of conventional rheological models. To optimize the application of these mathematical models, the shear rheological characteristics of polyacrylamide at various concentrations were investigated under different shear rates and shear modes. The results indicate that pseudoplastic fluid polymers exhibit two distinct rheological characteristics within their "shear thinning" rate range. The critical shear rate at this threshold signifies the point at which shear stress begins to disrupt the structure of the polymer solution, resulting in a rheological curve that transitions from high to low shear rates without reverting back to a low-to-high state. The concentration of the solution has minimal effect on the critical shear rate of the polymer, which is primarily determined by the inherent properties of the polymer itself. The application of rheological models during preparation and injection processes can elucidate the effects of shear on polymers by analyzing changes in apparent viscosity. Furthermore, the rheological model following supercritical shear rates requires modifications to the consistency coefficient (K) and flow index (n) based on shear rheological data obtained from high to low shear rates.
References
Smith. Closing the Lab-Field Gap: A Look at Near-Wellbore Flow Regimes and Performance of 57 Field Projects 1994; SPE 27774. https://doi.org/10.2118/27774-MS
Osterloh. Polymer Transport and Theological Properties for Polymer Flooding in theNorth Sea Captain Field 1998; SPE 39694. https://doi.org/10.2523/39694-MS
Yang YL, Shu Z, Ye ZB, et al. An improved study of near-well zone flooding for polymer solution through the mechanical shearing and forchheimer flow simulation. Materials Today Communications 2024: 38: 107634. https://doi.org/10.1016/j.mtcomm.2023.107634
Muruaga E, Flores M, Norman C, et al. Combining Bulk Gels and ColloidalDispersion Gels for Improved Volumetric Sweep Efficiency in a Mature Waterfloodin: Days, SPE, Tulsa, Oklahoma, USA 2008; SPE-113334-MS. https://doi.org/10.2118/113334-MS
Seright RS. The effects of mechanical degradation and viscoelastic behavior oninjectivity of polyacrylamide solutions. Soc Pet Eng J 1983; 23: 475-485. https://doi.org/10.2118/9297-PA
Javier FR, Luis JB, Simón L. Practical Mathematical Model for the Evaluation of Main Parameters in Polymer Flooding: Rheology, Adsorption, Permeability Reduction, and Effective Salinity. ACS Omega 2022; 7(29): 24982-25002. https://doi.org/10.1021/acsomega.2c00277
Azad MS, Trivedi JJ. Extensional effects during viscoelastic polymer floodingunderstanding unresolved challenges. SPE J 2020; 25: 1827-1841. https://doi.org/10.2118/201112-PA
Davarpanah A, Mirshekari B. A mathematical model to evaluate the polymer flooding performances.Energy Reports 2019; 5: 1651-1657. https://doi.org/10.1016/j.egyr.2019.09.061
Díaz AF, Torné PJ, Prada A, et al. Shear degradation model of HPAM solutions for the design of regulator valves in polymer flooding EOR.Journal of Petroleum Exploration and Production Technology 2020; 10:1-13. https://doi.org/10.1007/s13202-020-00905-5
Alzaabi AM, Jacobsen GJ, Masalmeh S, et al. Polymer Injectivity Test Design Using Numerical Simulation. Polymers 2020; 12(4): 801-801. https://doi.org/10.3390/polym12040801
Li K, Xu D, Zhou W, et al. Integrated Separate Layer Injection Technology on Water-Polymer Full Term Flooding for II and III Kind Formation.IOP Conference Series: Earth and Environmental Science 2019; 310(4): 042030-042030. https://doi.org/10.1088/1757-899X/768/4/042030
Wang Y, Cao G, Wang G, et al. The Experiment of Viscosity Loss Caused by the Polymer flow along Transportation Pipeline. International Conference on Energy Science and Applied Technology 2014; 733: 80-83. https://doi.org/10.4028/www.scientific.net/AMM.733.59
Zhang Y, Wang J, Jia P, et al. Viscosity Loss and Hydraulic Pressure Drop on Multilayer Separate Polymer Injection in Concentric Dual-Tubing. Energies 2020; 13(7): 1637. https://doi.org/10.3390/en13071637
Zhang SC, Chen XD, Deng HY. The effect of maximum open height on operating characteristics of polymer injected pump poppet valve".Proceedings of the 26th IAHR Symposium on Hydraulic Machinery and Systems Ed 2012; 1397-1402. https://doi.org/10.1088/1755-1315/15/5/052023
Yang C. Research on the Modification of Three Plunger Polymer Injection Pump to Maintain Adhesion.Northeast University of Petroleum 2016. (Master's thesis)
Zhu SJ, Xue XS, Zhang J, et al. Application and Optimization of the Rheological Model for a Hydrophobically Associating Dendrimer Polymer. Polymers 2022; 14(9): 1747. https://doi.org/10.3390/polym14091747
Seright RS, Fan TG. New Insights into Polymer Rheology in Porous Media. SPE Journal 2011; 16: 35-42. https://doi.org/10.2118/129200-PA
Jiang TQ. Chemical Rheology. Shanghai: East China University of Science and Technology Press 2004.
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