Energy and Geotechnical Engineering - Niumag

Academic Achievements

Literature Review |Petroleum Science: Study on Water Infiltration Mechanism and Pore Structure Evolution in Fractured Sandstone Based on Low-Field Nuclear Magnetic Resonance Understanding water infiltration and pore structure evolution in fractured sandstone reservoirs is critical for optimizing hydraulic fracturing in tight gas extraction. This study employs real-time low-field nuclear magnetic resonance (LF-NMR) technology to investigate the effects of near-wellbore fracture dip angles (α = 0°, 15°, 30°, and 45°) on fluid infiltration, migration patterns, and pore structure evolution during water injection. By monitoring T₂ relaxation spectra and magnetic resonance imaging (MRI) throughout the pressurization process, the results reveal that increasing injection pressure promotes the transformation of adsorption pores into seepage pores, with pore damage primarily occurring during the rapid pressurization stage and concentrated around the fracture. The fluid infiltration area and flow rate are largest at α = 0° and smallest at α = 45°, demonstrating that fracture dip angle significantly governs infiltration pathways. Water seepage along fracture walls consistently outpaces that at the fracture tip, leading to increased infiltration front inclination with larger α. Based on these findings, it is recommended to align perforation direction with natural fracture strike and optimize pressurization strategies by shortening the slow pressurization stage while extending the rapid pressurization stage. This study demonstrates the capability of LF-NMR as a powerful, non-destructive tool for characterizing fluid-rock interactions, providing valuable guidance for fracturing interval selection and injection parameter optimization in sandstone gas reservoirs.

Literature Review | Professor Xu Li's Team at Beijing Jiaotong University Journal of Hydrology: Characterization of Pore Water Distribution Characteristics in Silty Clay During Compaction, Saturation, and Drying Processes Based on Nuclear Magnetic Resonance Technology Characterizing pore water distribution (PWD) is essential for understanding the hydraulic and mechanical behavior of unsaturated soil. This study employs Low-Field Nuclear Magnetic Resonance (NMR) relaxometry to quantitatively investigate the PWD evolution in compacted silty clay under varying compaction degrees, initial water contents, and drying processes. By calibrating the T₂ relaxation time against Mercury Intrusion Porosimetry (MIP) data, we established a robust conversion model to transform NMR signal amplitudes into pore water volume across specific pore radii. The results delineate three distinct pore water categories: adsorbed water (<0.05 μm), intra-aggregate water (0.05–1.0 μm), and inter-aggregate water (>1.0 μm). Furthermore, by integrating the Young-Laplace theory with cumulative pore water distribution curves derived from NMR, we propose two predictive methods (Saturated Cumulative Curve Method and Unsaturated Envelope Method) for estimating the Soil-Water Characteristic Curve (SWCC) across a wide suction range. This study demonstrates that low-field NMR is a powerful technique for non-destructive, quantitative monitoring of pore fluid dynamics in geotechnical applications.

Literature Interpretation | Shandong University Sun Dejun Team《Colloids and Surfaces A: Physicochemical and Engineering Aspects》：Moisture Distribution Characterization of Oil-Based Drilling Fluids Based on Low-Field Nuclear Magnetic Resonance Technology

Literature Interpretation | Professor Pan Zhejun's team from Northeast Petroleum University and Associate Professor Du Yi's team from Northwest University《Application of nuclear magnetic resonance technology in reservoir characterization and CO2 enhanced recovery for shale oil: A review》：Application Overview of Nuclear Magnetic Resonance Technology in Shale Oil Reservoir Characterization and CO₂-Enhanced Oil Recovery (EOR)

Literature Interpretation | Professor Chen Zheng's Team, School of Civil Engineering, Guangxi University《Composites part B》：Effect of Loading on the Internal Water Distribution and Migration of Hardened Cement Paste with Different Water Contents

[Literature Review] Dynamic LF-NMR Analysis of the Effect of Shrinkage Reducing Agents on Water Migration and Pore Structure in Cement-Based Grouting Materials

Literature Interpretation | Characterization of the Imbibition and Pore Structure Evolution of Damaged Salt Rocks under Moisture Cycling Using Low-Field Nuclear Magnetic Resonance

Literature Interpretation | Professor Liu Jiankun's team from Sun Yat-sen University and Professor Wang Enliang's team from Northeast Agricultural University: Research and Simulation of Frozen Soil Unfrozen Water and Compressive Strength Tests Based on Artificial Freezing Technology

Literature Interpretation | Professor Zhao Yu's Team from the School of Civil Engineering, Guizhou University《Construction and Building Materials》：Exploring the Effect of Aggregate Particle Size on Moisture Distribution and Pore Fractal Characteristics during Cement Mortar Hydration Process Based on Low-Field Nuclear Magnetic Resonance Technology

Literature Interpretation | Professor Zhao Yu's Team from the School of Civil Engineering, Guizhou University《Energy》：Microwave Fracturing of Frozen Coal with Different Moisture Contents: Pore Structure Evolution and Temperature Characteristics

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