Open Access
ARTICLE
Wei Wang1, Hao Guo1, Cheng Jian1, Yi Yu1, Quanmin Jiang1, Chunyu Wang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.085147
Abstract To overcome the inherent limitations of conventional post-cementing acidification, including limited acid penetration into the formation and the potential impairment of zonal isolation, a novel pre-cementing acidification approach is proposed. This method aims to remove near-wellbore formation damage before cementing operations. Its feasibility, however, critically depends on the physicochemical compatibility between residual acid and the subsequent cementing fluids, namely spacer fluids and cement slurries. In this study, a comprehensive series of laboratory experiments was conducted to evaluate the effects of residual acid on flushing efficiency, rheological compatibility, and thickening time. The results show that residual… More >
Open Access
ARTICLE
Hai Yang1, Chao Yang1, Guoyong Sui1, Wendi Yang1, Zongkai Han1, Dan Guo2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.082466
（This article belongs to the Special Issue: Theoretical Foundations and Applications of Multiphase Flow in Pipeline Engineering)
Abstract This study investigates the leakage and dispersion behavior of high-pressure CO2 in long-distance pipelines using computational fluid dynamics (CFD) coupled with a regional-scale modeling framework. The influence of key operational and environmental parameters, including transport temperature, pressure, pipeline diameter, leak orifice size, and ambient wind speed, is systematically examined, with particular emphasis on their role in governing the spatial extent of solid CO2 formation. The results indicate that the evolution of the leakage flow field is governed by a strong coupling between thermodynamic effects and fluid dynamic processes. Elevated temperatures delay the formation of the Mach… More >
Open Access
ARTICLE
Xiaoguang Wang1,2, Dehua Liu1,2,*, Zhenping Liu3, Zhen Luo3, Guihua Yang1,2, Zongfa Li1,2, Lijuan Huang1,2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.079864
（This article belongs to the Special Issue: Complex Flows in Geological and Surface Processes)
Abstract Low-permeability conglomerate reservoirs are characterized by complex pore structures and poor sweep efficiency, making the optimization of carbon dioxide-water alternating gas (CO2-WAG) injection critical for enhanced oil recovery. To evaluate the displacement performance of CO2-WAG and determine the lower limit of effectively swept pore throats, this study presents long-core flooding experiments conducted on cores from the KS Formation of the B Oilfield in the Junggar Basin under reservoir conditions (20.1 MPa and 58°C). Continuous CO2 flooding and CO2-WAG schemes with varying cycle numbers and gas-water ratios (GWRs) were systematically compared. In situ online nuclear magnetic resonance (NMR) monitoring… More >
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