Impact of microwave treatment on rheological properties and structural evolution of waxy crude oil
Available online 10 December 2025
The transportation of waxy crude oil is severely challenged by its high viscosity and tendency to form a gel structure at low temperatures. This study comparatively investigated the effectiveness of...
Dual-modality microwave-conductivity sensing system for flow characterization in high water-cut production wells
Available online 9 December 2025
This study introduces a novel microwave-conductivity dual-modality sensing system for liquid-liquid flow measurement in oilfield water injection. The system combines a flexible microstrip array antenna...
Unlocking the seal capacity of unconsolidated Quaternary hydrate-bearing sediments: carbon isotope gradients as a proxy for dynamic gas trapping efficiency
Available online 9 December 2025
Submarine gas hydrate systems store vast carbon inventories (∼1,500–12,400 Gt C) yet pose dual risks as potential geohazard multipliers and climate feedback agents under oceanic warming. Conventional...
Lateral constrained multi-trace seismic inversion based on deep learning
Available online 9 December 2025
Seismic inversion is a widely used method for exploring and characterizing subsurface geological structures, especially in the context of oil and gas exploration. The data-driven approach exemplified...
Sedimentary heterogeneity-constrained differential diagenesis in fluvial tight sandstones: Implications for reservoir quality heterogeneity in sandbody architectural elements
Available online 8 December 2025
Fluvial tight sandstones, as unconventional reservoirs, feature complex sedimentary, diagenetic, and reservoir quality heterogeneities that fundamentally control their exploration and development. This...
Mechanical, structural, and mineralogical changes of shale under acid-CO2-rock interactions and their implications for CO2 storage
Available online 8 December 2025
Elucidating the underlying chemo-mechanical coupling mechanisms of acid- supercritical carbon dioxide (scCO2) reactions in shale reservoirs is essential for advancing the efficacy and safety of CO2...
CT investigation on oilwell cement deterioration caused by H2S along a leaking channel under high temperature: Insights for geothermal applications
Available online 8 December 2025
The alteration of oilwell cement due to H2S poses a significant threat to wellbore structural integrity in geothermal environments. However, laboratory studies on the cement deterioration process caused...
Chloride-dependent enhancement of microbiologically influenced corrosion on X80 steel by Desulfovibrio desulfuricans: the critical role of extracellular polymeric substances
Available online 8 December 2025
Microbiologically influenced corrosion (MIC) and chloride ion attack represent principal factors contributing to the premature failure of marine metallic infrastructures. This study systematically investigated...
Nanoconfined multi-phase interactions govern distinct phase behavior of CO2-oil in shale during CCUS-EOR process
Available online 8 December 2025
Nanopores are widely distributed in shale oil formations, and the distinctions induced by nanoconfinement significantly affect the accuracy of multiphase fluid behavior prediction and flow characterization...
Investigating residual oil distribution and CO2-EOR mechanisms in sand-conglomerate reservoirs using integrated CT and NMR techniques
Available online 4 December 2025
Sand-conglomerate reservoirs, comprising cemented sand grains and gravels, exhibit strong heterogeneity and complex flow behavior, which often result in poor sweep efficiency and low recovery during...
CFD study on gas-solid hydrodynamics during the scale-up of high-density circulating fluidized bed
Available online 3 December 2025
High-density circulating fluidized bed (HDCFB) offers high gas-solid contact efficiency and shows great application prospects in the petrochemical industry. It is important to study the scale-up of...
Study on the Sealing Performance of the K-Type Metal Sealing Ring of the Subsea Christmas Tree
Available online 3 December 2025
The Christmas tree tubing hanger serves as a channel for oil, gas, and electrical flow, supporting the tubing string and sealing the annular space. The sealing performance of the tubing hanger is important...
Dynamic deconvolution based on adaptive local frequency modulation transform
Available online 3 December 2025
Dynamic deconvolution in the time-frequency domain is an effective method to improve seismic resolution. However, the traditional methods usually suffer from the limitation of window width and shape,...
Advancing CCUS-EOR in low-permeability reservoirs with surfactant-enhanced carbonated water and CO2 alternating flooding: An integrated experimental and numerical investigation
Available online 3 December 2025
Surfactant-enhanced carbonated water alternating with CO2 (SCWAG) flooding, which integrates the advantages of surfactants, carbonated water (CW), and CO2, has demonstrated significant potential for...
Application of a CWFS model-based brittleness index for evaluating anisotropic brittleness in terrestrial shale under triaxial stress
Available online 1 December 2025
For shale reservoir operations, assessing the brittleness of anisotropic shales is vital of optimizing wellbore stability analysis and fracturing design. Current brittleness indices lack effectiveness...
OFC
November 2025
TOC
November 2025
A modeling-inversion methodology for source rocks based on clay-kerogen lamination and pore geometry
November 2025
Source rocks (shales) exhibit different geometric pore types and considerable anisotropy caused by the preferential orientation of the clay and kerogen layers, which is not accounted for in classical...
Optimization and application of KCl polymer drilling fluid balancing wellbore stability and logging response accuracy
November 2025
In Dagang Oilfield in China, the utilization of the KCl polymer water-based drilling fluid (WBDF) in mid-deep exploration/appraisal wells presents a challenge in simultaneously optimizing resistivity...
Numerical investigations on T1-T2∗-based petrophysical evaluation in shale oil reservoir with complex minerals
November 2025
It is of great significance to evaluate the petrophysical properties in shale oil reservoir, which can contribute to geological storage CO2. Two-dimensional nuclear magnetic resonance (2D NMR) technology...
FDEM modeling of the fracture propagation behavior under the joint interaction of shale anisotropy and multi-lithologic stack
November 2025
Exploring the interaction between hydraulic fractures and complex geological conditions is critical for multilayered commingling production in the laminated continental shale oil reservoirs. In this...
Near-wellbore 3D velocity imaging inversion method based on array acoustic logging data
November 2025
The characterization of subsurface formations via the analysis of near-wellbore velocity profiles represents a crucial method in geophysical exploration. This technique enables the evaluation of key...
Experimental investigation into the fracture propagation behavior of horizontal well multi-stage and multi-cluster fracturing within the roof of crushed soft coal seams
November 2025
The effectiveness of horizontal well multi-stage and multi-cluster fracturing in the fractured soft coal seam roof for coalbed methane (CBM) extraction has been demonstrated. This study focuses on the...
Intelligent identification method for dissolution vugs in karst reservoirs of carbonate rocks using electrical image logs: The Dengying Formation reservoir in the Gaoshiti-Moxi block, Sichuan Basin
November 2025
Accurately characterizing the storage space of fractured-vuggy carbonate reservoirs is a major technical challenge in the efficient exploration and development of the petroleum industry. Electrical...
A dynamic unified well-killing model for synergistic regulation of multiple well-killing methods
November 2025
Ultra-deep and complex formations are characterized by narrow safety density windows and challenging well control. The combined use of multiple well-killing methods or temporary adjustments to well-killing...