A micro-crosslinked amphiphilic copolymer viscosifier for high temperature and high-density inorganic salt completion fluids
March 2026
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...
Study on prediction of annular trap pressure in ultra-high temperature and high pressure gas wells
March 2026
Accurate calculation of annular trap pressure in ultra-high-temperature and high-pressure (UHTHP) wells is crucial for ensuring the safety and integrity of tubular systems. Existing annular pressure...
A novel application of a stepwise extraction protocol: resolving the challenge of biomarker detection in high-maturity shale systems
March 2026
Biomarkers in source rocks are crucial in uncovering biological source and depositional environment. However, the detection of critical biomarkers such as steranes and terpanes in high-maturity source...
Double-crosslinked self-degradable hydrogel for temporary plugging in low temperature reservoirs
March 2026
Temporary plugging agents are critical to oilfield operations such as diversion fracturing, wellbore interventions, and drilling. This study develops a double-crosslinked self-degradable gel (DSDG)...
Synergistic alginate chelation and semi-interpenetrating network for advanced wellbore stabilizing hydrogels
March 2026
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...
Charge-structure synergy in reservoir wettability reversal: Investigating with an integrated optical-multiscale framework
March 2026
Reservoir wettability modification is a key strategy for enhancing oil recovery (EOR), yet the mechanisms driving this reversal remain incompletely understood due to the scarcity of multiscale characterization...
A numerical study on blending hydrogen into natural gas pipeline by the SMV static mixer: Mixing performance and mass transfer mechanism
March 2026
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...
Sedimentary heterogeneity-constrained differential diagenesis in fluvial tight sandstones: Implications for reservoir quality heterogeneity in sandbody architectural elements
March 2026
Fluvial tight sandstones, as unconventional reservoirs, feature complex sedimentary, diagenetic, and reservoir quality heterogeneities that fundamentally control their exploration and development. This...
The control of paleo-geomorphology on the depositional architecture of a Late Jurassic axial submarine fan, North Sea, UK
March 2026
The depositional architecture of submarine fans in rift basins is significantly controlled by complex geomorphology created by widespread normal faults, presenting a key challenge in deep-water sedimentology....
Assessment of shale hydrocarbon evaporative loss during exposure: Insights from online low-field nuclear magnetic resonance observations in the Qingshankou Formation, Songliao Basin, China
March 2026
Understanding the evaporative loss of shale oil is critical for the shale oil resources assessment. However, previous studies have largely neglected the rapid evaporative loss of shale oil that occurs...
Thermal maturity assessment of organic matter in the Precambrian–Lower Paleozoic high-over matured marine shale reservoirs: A review
March 2026
Thermal maturity is one of key parameters for source rock evaluation, which affects not only the effectiveness of hydrocarbon generation and the properties of hydrocarbon but also the formation, evolution...
Study on the sealing performance of the K-type metal sealing ring of the subsea Christmas tree
March 2026
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
March 2026
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,...
Pore scale phase behavior of condensate gas in porous media: Insights from 2D NMR T1–T2 spectrum method
March 2026
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...
Research on the genesis mechanism of shale fractures
March 2026
Shale fractures, serving as conduits for the flow and storage space of shale oil, play a critical role in resource exploration and evaluation. Shale oil is considered a highly promising unconventional...
Timing of deep oil accumulations in the western part of the northern Tarim Basin: Records from fluid inclusions and carbonate U–Pb dating
March 2026
Liquid oils in deeply buried reservoirs are usually subjected to thermal cracking by the prolonged time-temperature effect during burial. However, large quantity liquid oils are being produced from...
Large-scale physical simulation of flow behavior in Kelasu ultra-deep fractured low-porosity sandstone gas reservoirs
March 2026
The ultra-deep fractured low-porosity sandstone gas reservoirs in the Kuqa Depression of the Tarim Basin exhibit complex characteristics, including high temperature, high pressure, significant in-situ...
Investigating residual oil distribution and CO2-EOR mechanisms in sand-conglomerate reservoirs using integrated CT and NMR techniques
March 2026
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...
Mechanical, structural, and mineralogical changes of shale under acid-CO2-rock interactions and their implications for CO2 storage
March 2026
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 geo-storage...
Investigation of fracture pressure and EOR mechanisms during fracturing flooding in low-permeability sandstone using CT and NMR
March 2026
Fracturing flooding provides an effective approach to overcoming injection difficulties and enhancing oil recovery in high-water-cut, low-permeability sandstone reservoirs. Injecting fracturing-flooding...
Impact of microwave treatment on rheological properties and structural evolution of waxy crude oil
March 2026
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...
Degradable PAM hydrogel mediated by hydroxy acids for temporary plugging
March 2026
In this study, the degradation time of gel plugs was regulated by introducing hydroxy acids to adjust the crosslink density, effectively addressing the challenge of controllable degradation time in...
Numerical and physical simulations of acoustic imaging for adjacent well detection while drilling
March 2026
With increase in the number of operations involving relief wells, radial wells, U-shaped wells, and other complex well structures, challenges such as collision prevention, obstacle bypassing, and adjacent-well...
A cascaded pipeline defect detection and size estimation method based on the YOLOv11 and physics-informed network using the MFL data
March 2026
Long-distance oil and gas pipelines are crucial in the global energy network. However, due to complex internal and external environments, defects can be formed on a pipelineʼs surface, posing severe...
A hierarchical Bayesian–MCMC model for predicting the geometric dimensions of corrosion defects in wet gas gathering pipelines
March 2026
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...