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Visualization of adaptive polymer flow and displacement in medium-permeable 3D core-on-a-chip

Petroleum Science 2023年第2期20卷 1018-1029页

作者： Yan Zhang Xue-Zhi Zhao Pei-Hui Han Li-Yuan Zhang David A.Weitz Yu-Jun Feng Polymer Research Institute State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu610065SichuanPR China EOR Laboratory Exploration&Development Research InstituteDaqing Oilfield Limited CompanyPetroChinaDaqing163712HeilongjiangPR China School of Engineering and Applied Sciences Harvard UniversityCambridge02138United States School of Petroleum Engineering China University of PetroleumQingdao266580ShandongPR China

Polymer flooding has been witnessed an effective technology for enhancing oil recovery from medium-to low-permeability reservoirs;however, direct visualization of polymer solution flow in such reservoir condition is still lacking. In this work, a three-dimensional (3D) core-on-a-chip device with a permeability of around 200 mD was prepared and employed to visualize the pore-scale flow and displacement of a self-adaptive polymer (SAP, 8.7 × 106 g·mol−1)−whose microscopic association structure and macroscopic viscosity can reversibly change in response to shear action−versus partially hydrolyzed polyacrylamide (HPAM), by recording their flow curves, monitoring dynamic transportation process via particle imaging velocimetry, and building 3D structure of remaining oil. The results show that, in single-phase flow, all polymer solutions exhibit flow thinning and then thickening regions as flow rate increases, but the transition between two regimes occurs at a small Weissenberg number (10−3−10−1) in this medium-permeable condition. In contrast to HPAM-1 with close weight-average molecular weight (Mw), the adaptive character not only extends SAP's shear-govern region, allowing SAP to propagate piece by piece and achieve higher accessible pore volume, but it also enhances the elastic resistibility of polymer in the extension-dominated regime, increasing the microscopic displacement efficiency. These two effects result in 1.5–3 times more oil recovery factor for SAP than for HPAM-1. Regarding ultra-high-Mw HPAM-2 (25 × 106 g·mol−1), plugging and chain degradation do occur, thus producing lower oil recovery than SAP. This work provides a direct approach for in-situ assessment of polymer-based displacing system under a more authentic condition of practical reservoirs.

关键词： Polymer flooding Medium-permeable transparent media Adaptive polymer In-situ rheology particle imaging velocimetry

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Dynamic analysis of impulse waves generated by the collapse of granular pillars

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Journal of Mountain Science 2022年第1期19卷 198-210页

作者： HUANG Bo-lin LI Bin ZHENG Jia-hao FENG Wang-li CHEN Xiao-ting LUO Chao-lin Hubei Key Laboratory of Disaster Prevention and Mitigation China Three Gorges UniversityYichang 443002China College of Civil Engineering&Architecture China Three Gorges UniversityYichang 443002China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China The Pearl River Hydraulic Research Institute Guanzhou 510611China

Impulse waves generated by the collapse of pillar-shaped rock masses in Three Gorges, China,have attracted the attention of both researchers and local authorities owing to their catastrophic consequences. In this work, particle imaging velocimetry(PIV) was used to study impulse waves generated by the collapse of granular pillars during a series of physical experiments. Subsequently, the scenes of particles collapsing into water and the resulting impulse waves were analysed in terms of the solid/fluid fields. The energy obtained by the water during this process is mainly derived from the volume encroachment and continuous thrusting of *** indicated by the experimental results, as the aspect ratio(a) of the pillar and water depth increased, the potential energy of the granular pillar became more prone to reduction, whereas the efficiency of energy conversion to the liquid phase reduced. At constant water depth and granular pillar width, the maximum amplitude generated by the collapse of the granular pillar remained essentially the same(i.e., "saturation"was achieved) once the aspect ratio exceeded a certain threshold. The maximum impulse wave(the primary wave) formed before the main body of particles collapsed, resulting in the "saturation" of the maximum amplitude. When the kinetic energy of the particles reaches the maximum, the ratio of energy dissipation of the particles is the lowest;as the energy of water reaches the maximum, the particle collapse process does not end. The dynamic analysis of the impulse waves generated by the collapse of granular pillars provides a new approach to obtain an in-depth understanding of landslides and impulse waves. This can provide technical guidelines for disaster prevention and mitigation of impulse waves generated by bank collapse or coastline collapse.

关键词： Granular pillar collapse particle imaging velocimetry particle/fluid interaction Energy conversion Maximum amplitude

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Flow Field and Performance of Cross Flow Fans——Experimental and Theoretical Investigations

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Journal of Thermal Science 2003年第3期12卷 234-238页

作者： Martin Gabi Simon Dornstetter Toni Klemm Institute of Fluid Machinery University of Karlsruhe (TH) D-76128 Karlsruhe GermanyRobert Bosch GmbH D-71701 Schwieberdingen GermanyInstitute of Fluid Machinery University of Karlsruhe (TH) D-76128 Karlsruhe Germany

Due to the construction and the operating principle the prediction of performance of Cross Flow Fans (CFF) is difficult and the knowledge about the internal flow regime is limited. To investigate the impact of geometrical parameters on the performance of CFF, experimental investigations, using particle imaging velocimetry (PIV), and CFD calculations were carried out. Some results of PIV measurements and CFD calculations are presented, which give an impression of the internal flow and confirm the numerical calculations.

关键词： fans cross-flow fans computational fluid dynamics particle imaging velocimetry

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A High-speed Nature Laminar Flow Airfoil and Its Experimental Study in Wind Tunnel with Nonintrusive Measurement Technique

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Chinese Journal of Aeronautics 2009年第3期22卷 225-229页

作者：朱军高正红詹浩白俊强西北工业大学翼型叶栅空气动力学国防科技重点实验室西安710072

This article deals with an experimental study on the aerodynamic characteristics of a low-drag high-speed nature laminar flow (NLF) airfoil for business airplanes in the TST27 wind tunnel at Delft University of Technology, the Netherlands. In this experiment, in an attempt to reduce the errors of measurement and improve its accuracy in high-speed flight, some nonintrusive meas- urement techniques, such as the quantitative infrared thermography (IRT), the digital particle imaging velocimetry (PIV), and the s...

关键词： wind tunnels particle imaging velocimetry infrared thermography shadowgraphy high-speed nature laminar flow airfoil

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