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...
Microscopic Heterogeneity Characteristics and Movable Oil Characterization of Ultra-Deep Shale Oil in the Mahu Sag
Available online 9 May 2026
The shale oil in the Fengcheng Formation of the Mahu Sag has become an extremely critical target for large-scale reserve growth in the Junggar Basin. Characterized by great burial depth, complex geology,...
Hydrocarbon–helium coupled accumulation processes and formation mechanisms of helium-rich gas fields in the southwestern Ordos basin
Available online 8 May 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...
Numerical study on formation blockage and back-pumping during geothermal water reinjection in weakly consolidated heterogeneous reservoirs using a novel mechanism model
Available online 7 May 2026
For the utilization of low-medium temperature geothermal water, the well injection capacity for tail water disposal is often reduced due to the migration of self-generated particles and the invasion...
GLDA chelation-driven mineral dissolution for enhanced porosity and permeability in coalbed methane reservoirs: An experimental study
Available online 6 May 2026
Conventional acidification for coalbed methane (CBM) reservoir stimulation is challenged by equipment corrosion, secondary reservoir damage, and environmental pollution. To address these limitations,...
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
Available online 5 May 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...
Advances in Underground Gas Storage: A Review of Current Practices and Future Prospects
Available online 30 April 2026
Underground gas storage (UGS) plays a vital role in ensuring energy security and supporting the transition to a low-carbon energy future by enabling the large-scale storage of methane-rich natural gas...
Relative permeability model for shale reservoirs considering water distribution and imbibition with two fractal regions
April 2026
Shale gas is a key transitional low-carbon energy source, offering a cleaner-burning alternative to coal, reducing greenhouse gas emissions, and supporting energy security during the transition to renewable...
Pre-oxidized PAN/PVP nanofibrous membranes with enhanced mechanical robustness and chemical stability for high-flux separation of oily wastewater from petroleum production
April 2026
Discharge of oily wastewater, generated from oil and gas production can lead to severe marine and soil contamination, posing long-term threats to ecosystems and water security. Therefore, developing...
Machine learning-based surrogate correlation for prediction of wax deposition rate in oil and gas pipelines
April 2026
This study developed a data-driven surrogate-box correlation to predict wax deposition rates in crude-oil pipelines and help address the limited generalizability of empirical and mechanistic models...
Assessing the efficiency of long-term CO2 geological storage using an advanced multiphase compositional simulator
April 2026
CO2 sequestration has a critical role in mitigating climate change impacts, thus we rely on numerical simulations to capture the processes of CO2 injection, migration, and long-term storage. This paper...
Enhancing CO2 huff-n -puff strategies for improved oil recovery in the Bakken formation: A numerical simulation approach
April 2026
This study investigates the performance of various huff and puff (HnP) strategies for enhanced oil recovery (EOR) in the Sanish field of the Bakken formation, using a numerical model developed with...
Development and evaluation of graphene nanosheets as a novel micro-nano plugging agent for oil-based muds
April 2026
Although there are abundant shale gas resources in China, shale gas is generally buried much deeper than foreign countries. For large-scale development, there are still many core technologies that have...
Wellbore strengthening through rock consolidation using diammonium phosphate
April 2026
Wellbore instability in chalk formations poses significant challenges during drilling and production due to low rock strength, fluid sensitivity, and creep. This study investigates the efficacy of diammonium...
A graphene plugging material for high-temperature and high-salt water-based drilling fluids
April 2026
During the drilling process in deep oil reservoirs with high temperature and high salinity, the drilling fluid faces the risk of performance failure. Experiments have shown that the high-temperature...
Petroleum system modeling in the central part of the Fars platform (Zagros Basin)
April 2026
The Fars Platform is a geological region with significant untapped potential for petroleum resources. Its unique structural and stratigraphic features, combined with favorable reservoir conditions,...
