Interfacial tension modeling in CO2-brine systems using machine learning for enhanced CO2 storage
June 2026
This study introduces an advanced machine learning (ML) framework to predict interfacial tension (IFT) in CO2-brine systems, a key factor in optimizing carbon capture and storage (CCS) processes. Accurate...
A clustering-guided feature enhancement and Bayesian-optimized LSTM approach for LC temporal anomaly detection
June 2026
Lost circulation (LC), as one of the high-risk accidents in drilling, usually occurs when the wellbore pressure is greater than the formation pressure, causing a large amount of drilling fluid to seep...
Relative permeability and capillary pressure estimation via physics-informed machine learning and reinforcement learning
June 2026
Accurately predicting multiphase fluid flow in oil and gas reservoirs is crucial to optimizing production and minimizing costs. However, traditional numerical reservoir simulations are computationally...
Enhancing the properties of heavy crude oil in the Maysan field using low molecular weight solvents in a high-speed extraction unit equipped with top baffles
June 2026
Heavy crude oils present major challenges in transportation and front-end processing due to their extremely high viscosity and low API gravity. This work introduces an integrated experimental–statistical–mechanistic...
Development status of integrated CO2 fracturing-enhanced recovery-storage technology
June 2026
Driven by the dual objectives of the global energy industry—substantially enhancing hydrocarbon recovery and achieving long-term CO2 geological sequestration—this paper systematically reviews the development...
Discrete element method for investigating the borehole wall rock failure process based on the enhancement effect of microbial drilling fluids
June 2026
Borehole wall instability in unconsolidated formations is a critical challenge in drilling engineering and requires urgent attention. Microbially induced calcium carbonate precipitation (MICP) is a...
An improved hybrid screening framework for reservoir selection in CO2-Enhanced oil recovery
June 2026
The oil and gas industry increasingly employs advanced engineering solutions to optimize enhanced oil recovery (EOR). A systematic and effective screening process, supported by multi-criteria decision-making...
Fracture cross-layer propagation patterns and stimulation effectiveness evaluation in thin interbedded reservoir models
June 2026
Offshore thin interbedded reservoirs are characterized by frequent alternation of sandstone and mudstone, strong vertical heterogeneity, and complex fracture cross-layer propagation mechanisms, which...
Study on the dynamic mechanism of wellbore instability in deep fractured formations
June 2026
Due to the presence of highly discrete rock blocks and extensively developed natural fractures in fractured formations, frequent losses of drilling fluid and wellbore instability incidents occur during...
Synergistic effects of 2-ethoxyethanol and dissolved CO2 on interfacial tension reduction, wettability alteration, and oil swelling through carbonated water flooding in carbonate-sandstone oil reservoirs
June 2026
This paper investigates how the efficiency of the chemical carbonated water EOR technique is optimized using the nonionic surfactant 2-ethoxyethanol in CO2-rich water solutions. Tests were performed...
GLDA chelation-driven mineral dissolution for enhanced porosity and permeability in coalbed methane reservoirs: An experimental study
June 2026
Conventional acidification for coalbed methane (CBM) reservoir stimulation is challenged by equipment corrosion, secondary reservoir damage, and environmental pollution. To address these limitations,...
Hydrocarbon–helium coupled accumulation processes and formation mechanisms of helium-rich gas fields in the southwestern Ordos basin
June 2026
Helium is a critical strategic resource, with industrial helium primarily derived from helium-rich natural gas fields. Numerous large-scale natural gas fields with variable helium concentrations have...
Long-term property evolution of silica-cement systems at different curing temperatures and mechanistic insights
Available online 20 June 2026
Neat Portland cement suffers severe strength retrogression at temperatures above 110 °C, and silica addition is commonly used to improve its high-temperature performance. This study investigates the...
Impact of Inlet Velocity on Non-Darcian-Forchheimer Oil Flow in Porous Media: A Numerical Approach
Available online 11 June 2026
Predicting fluid behaviour accurately is crucial for optimising extraction methods in petroleum engineering due to the considerable hurdles posed by the non-Darcian flow of oil through porous surfaces....
Advancements and Applications of Smart Water Injection in Enhanced Oil Recovery: Mechanisms, Economic Feasibility, and Synergies with Other EOR Techniques
Available online 11 June 2026
Smart water injection has emerged as a cost-effective and environmentally sustainable enhanced oil recovery (EOR) strategy for carbonate and sandstone reservoirs. This review presents a comprehensive...
Torsional vibrations rejection in drilling systems: a combined observer-higher-order sliding mode control approach
Available online 9 June 2026
One of the fundamental challenges in drilling systems is the phenomenon of torsional vibrations that can cause system destruction. This paper presents a new control approach to reject stick-slip vibrations...
A comprehensive review on enhancing coiled tubing reach: construction of a full-chain technology system, synergistic applications, and future perspectives
Available online 4 June 2026
The development of unconventional oil and gas resources increasingly relies on long horizontal wells, where coiled tubing (CT) is a key enabler for efficient intervention operations. However, as horizontal...
Sustainable Cementing Solution by Optimizing Ilmenite-Based Cement with Tire Waste for HPHT Environments
Available online 3 June 2026
Cementing is essential for maintaining wellbore integrity, but high-pressure, high-temperature (HPHT) reservoirs can compromise the stability of conventional cement formulations. Ilmenite is commonly...
Mechanistic Understanding and Mathematical Advancements of Spontaneous Imbibition and Fluid Saturation Measurement: A Comprehensive Review
Available online 2 June 2026
Accurate prediction of the imbibition of fluid in pores would help to properly estimate the oil/gas recovery. This study is focused on imbibition estimation, considering the influences of various rock...
Advancing Reservoir Characterization and Optimal Sweet Spot Identification: A Review of Artificial Intelligence and Machine Learning Applications
Available online 30 May 2026
Accurate reservoir characterization remains a critical challenge during the early stages of reservoir development. While traditional methods have dominated the oil and gas industry, recent advancements...
A comprehensive analysis of HPHT drilling fluids: advances in formulation, rheology, AI/ML utilisation, and industry challenges
Available online 29 May 2026
High-pressure and high-temperature (HPHT) drilling presents significant challenges to conventional drilling fluids due to extreme downhole environments that compromise rheology, suspension integrity,...
Reservoir characterization and pore system heterogeneity analysis of the Eocene Mangahewa Formation: Insights from Kapuni field, Taranaki Basin
Available online 20 May 2026
Understanding the controls of depositional and diagenetic processes on pore system evolution is essential for predicting fluid flow behavior in sedimentary reservoirs. The sandstones of Mangahewa Formation...
Analysis of Particle Transport Mechanism and Factors Influencing Sealing Effect in Fractured Strata
Available online 19 May 2026
Severe fluid loss in fractured formations poses a major technical challenge in deep oil and gas drilling, significantly constraining wellbore integrity and drilling efficiency. This study establishes...
Mechanisms and patterns of crude oil mobilization in microscopic pores under gravity-assisted CO2 miscible displacement: A case study of tight conglomerate reservoirs in the Mahu Sag, Xinjiang
Available online 16 May 2026
To address the unclear understanding of the microscopic oil displacement mechanisms, patterns of oil mobilization in pore throats, and optimal displacement methods for gravity-assisted CO2 miscible...
Gas condensate recovery in carbonate rocks through wettability alteration: Characterization and optimization by response surface methodology (RSM)
Available online 12 May 2026
Liquid blockage around the wellbore region can significantly decrease the gas and condensate extraction volume from a condensate reservoir. In these kinds of reservoirs, the rock surfaces are commonly...
