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...
Interfacial phenomena and flow dynamics in porous media using xanthan gum-based green nanofluids for enhanced oil recovery
Available online 27 June 2026
Enhanced oil recovery (EOR) efficiency is fundamentally governed by multiphase flow dynamics in porous media, where capillary forces trapping residual oil pose a significant challenge. This review analyzes...
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...
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...
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...
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,...
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...
