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...
A micro-crosslinked amphiphilic copolymer viscosifier for high temperature and high-density inorganic salt completion fluids
Available online 29 November 2025
Solid-free brine completion fluids, characterized by their exceptional reservoir protection capabilities and optimal rheological behavior, are highly desirable for applications in oil and gas reservoirs...
Microscopic forces between methane hydrate particle and droplet-wetted sand grain surface in a high-pressure system: experiments and mechanisms
Available online 29 November 2025
Solving the issue of hydrate formation and blockage in pipelines during deepwater oil and gas development and hydrate-based green energy extraction is a crucial flow assurance safety concern. The micro-forces...
Has the Belt and Road Initiative reshaped the ecological sustainability of Eurasia: A perspective of three-dimensional ecological footprint
Available online 29 November 2025
At present, environmental problems are becoming increasingly severe, and sustainable development concerns the common destiny of all mankind around the world. Leveraging ecological footprint and ecological...
A more efficient subsidy policy for CO2 enhanced oil recovery: Insights from a vertically integrated business model
Available online 28 November 2025
Although carbon dioxide enhanced oil recovery (CO2-EOR) is a technically and economically viable option within carbon capture, utilization, and storage (CCUS), its transition from demonstration to commercial...
Analysis of solidification process and gas sealability of Sn58Bi alloy plugging casing
Available online 27 November 2025
The Sn58Bi alloy plug, composed of 58% bismuth (Bi) and 42% tin (Sn), emerges as a promising alternative to conventional cement plugs. Investigating its mechanical behavior throughout the molten-to-solidified...
A Hierarchical Bayesian–MCMC Model for Predicting the Geometric Dimensions of Corrosion Defects in Wet Gas Gathering Pipelines
Available online 26 November 2025
Internal corrosion is a major threat to the safety of natural gas pipelines, with defect geometry—depth, length, and width—playing a critical role in structural integrity assessments. While corrosion...
Study on the phase behavior and minimum miscible pressure of CO2-shale oil in nanopores with confinement effect
Available online 25 November 2025
CO2 injection is a significant enhanced oil recovery method in shale oil reservoirs and facilitates the mitigation of CO2 emissions. However, the phase behavior and miscibility process of light shale...
A numerical study on blending hydrogen into natural gas pipeline by the SMV static mixer: Mixing performance and mass transfer mechanism
Available online 22 November 2025
Hydrogen is an important clean energy carrier that contributes to the carbon neutrality by reducing the dependence on fossil fuels. As its role in the global energy system continues to expand, the demand...
Application of acrylic-based wellbore strengthening material in water-based drilling fluid to stabilize the fractured formation
Available online 22 November 2025
Wellbore instability is the main challenge encountered during borehole construction, particularly when employing water-based drilling fluid (WBDF) under complex geological conditions. A novel wellbore...
Numerical investigation of natural gas-enhanced autothermic pyrolysis for optimizing in-situ conversion in oil shale
Available online 22 November 2025
The autothermic pyrolysis in-situ conversion process for oil shale (ATS) offers the advantages of low development costs and the capability to exploit deep oil shale resources. However, oil shale formations...
Effect of weak consolidation process of liquid bridge on interparticle mechanical behavior of clathrate hydrate
Available online 22 November 2025
Clarifying the mechanism that results in the mechanical behavior differences of hydrate particles in different states is of great significance for understanding the agglomeration mechanism of hydrate...
A novel local maximum synchrosqueezing W transform for reservoir characterization
Available online 21 November 2025
Time-frequency analysis (TFA) serves as a critical tool in seismic signal processing and interpretation, particularly for characterizing non-stationary signals. However, conventional TFA methods, such...
Hydrate phase equilibria in oil-containing fluid: Experimental investigation and machine learning prediction based stacked ensemble
Available online 21 November 2025
During oil and gas development and transportation, the presence of oil and complex component in natural gas significantly impacts the hydrate phase equilibrium. However, the specific characteristics...
Seepage and blockage characteristics of methane hydrate-bearing porous media under different hydrate distribution conditions
Available online 21 November 2025
Blockage commonly occurs in and severally affects natural gas (mainly methane) reservoir exploitation, combustion ice (methane hydrate) exploitation and oil and gas pipeline transportation. The formation...
Geochemical heterogeneity of ultra-deep oil pyrolysis: Nanoscale infrared spectroscopy insights
Available online 21 November 2025
The heterogeneous cracking process of ultra-deep oil is well-studied, yet the geochemical evolution mechanisms of crude oil pyrolysis at the microscale remain unclear. This study conducts a closed-system...
Dynamic evolution of residual oil during long-term waterflooding in Middle East carbonate reservoirs: A pore-scale investigation
Available online 20 November 2025
Long-term water flooding (LTWF) is an efficient way to improve oil recovery (EOR) in carbonate reservoirs in the Middle East. Due to the complex depositional environment and intricate pore-throat structures...
Synergistic alginate chelation and semi-interpenetrating network for advanced wellbore stabilizing hydrogels
Available online 20 November 2025
In situ plugging hydrogels represent a promising strategy to combat wellbore instability in fractured formations. Despite their potential, they often fail due to unpredictable gelation kinetics and...
Pore scale phase behavior of condensate gas in porous media: Insights from 2D NMR T1–T2 spectrum method
Available online 20 November 2025
The widespread development of unconventional oil and gas reservoirs has advanced reservoir research to the nanoscale level. Under the influence of nanoscale confinement effects, the phase behavior of...
Comparing the thermal processing with slurry phase hydroupgrading to increase the yields of distillates of Arabian heavy crude oil
Available online 20 November 2025
With the increasing heavy and inferior quality of global oil resources, the efficient utilization of crude oil has become a critical challenge to be solved in the energy field. This work intends to...