New approach for decline curve analysis of unconventional fractured reservoirs: Rate-normalized flow rate derivative concept
December 2025
This manuscript introduces a new decline curve analysis (DCA) technique to analyze and predict the potentials of hydraulically fractured unconventional resources. The new approach relies on the rate-normalized...
A new method for minimum distance separation factor calculation based on particle swarm optimization algorithm
December 2025
Anti-collision technology for wellbores is integrated into both the pre-drilling design and real-time drilling monitoring of cluster wells, infill wells, and directional wells. This technology encompasses...
Rock typing and causality analysis in unconventional formation using Bayes nets
December 2025
Unconventional formations are characterized by high heterogeneity and anisotropy, making it difficult to interpret logging data, perform core analysis, and create accurate petrophysical models. To address...
Analysis of inter-well interference and well spacing optimization for horizontal wells in Gulong terrestrial pure shale oil
December 2025
Gulong shale has abundant oil resources with low-porosity and low-permeability reservoir characteristics, and effective development has been achieved using horizontal well volume fracturing in single-well...
Treatment of water disposal injection process by oilfield chemicals: Maintaining injectivity and environmental effects
December 2025
Oil production from hydrocarbon reservoirs is invariably accompanied by water production, which poses significant challenges to both production and injection systems, particularly due to the formation...
High-resolution sequence stratigraphic framework and target sand bodies correlation of tight oil reservoirs in the Upper Triassic Yanchang Formation, Ordos Basin
December 2025
In this study, we developed a high-resolution stratigraphic framework for the Yanchang Formation in the Huachi Block of the Qingyang Oilfield, located in the Ordos Basin, northwest China. Using well...
Clay mineral content and their impact on reservoir quality: Insight into the carbonate reservoirs oil fields, Central-Eastern Russia
December 2025
Clay minerals are widespread in both sandstone and carbonate reservoirs. Previous studies have emphasized that clay minerals influence oil filtration in sandstones; however, very few studies to date...
Smart additives for fluid loss control in water-based drilling fluid: A review of recent developments
December 2025
Drilling fluids play a vital role in the success of oil and gas operations, ensuring cooling, lubrication, cuttings transport, and wellbore stability. Driven by environmental regulations, water-based...
Application of biosynthesized nanoparticles in chemical enhanced oil recovery: Main mechanisms, recent advances, challenges, and opportunities
December 2025
Nanoparticles are increasingly used in chemical enhanced oil recovery (CEOR) due to their ability to improve oil recovery by altering reservoir rock and fluid properties. These nanoparticles, which...
Starch nanoprecipitation with ethanol for the formulation of ultralow salinity formation water-tapioca starch nanoparticles potentially for enhanced oil recovery application
December 2025
The present study evaluated commercial starch behavior and tapioca starch nanoparticles (TSNP) with 100 ppm ultralow salinity formation water as a potential alternative for enhanced oil recovery (EOR)....
Efficacy of functionalized MWCNT-based polymeric nanofluids for enhancing oil recovery in reservoirs
December 2025
Polymer-based enhanced oil recovery boosts production in depleted oil fields. However, harsh reservoir conditions, such as high salinity and temperature, often reduce its effectiveness. This study explores...
The role of thermophysical analysis in laboratory petrophysical core studies: An example from Saurashtra Basin rocks, India
December 2025
Evaluating the physical properties of rocks and their spatial variations is essential for understanding reservoir characteristics and developing reliable hydrodynamic or basin models. This paper summarizes...
Mechanistic study on the effect of seepage force on fracture propagation behavior in multi-cluster fracturing of horizontal wells
December 2025
During multi-cluster fracturing of horizontal wells, low-viscosity fracturing fluid permeates extensively along the fracture walls into the rock pores, exerting seepage forces on the rock skeleton....
Cellulose bionanomaterial design for enhanced oil recovery: A review of existing, emerging technologies and future outlook
Available online 27 December 2025
Cellulose nanoparticles are attracting interest in diverse fields because of their availability, low cost, and benign nature. Albeit previous studies have reported excellent experimental results, the...
Proppant transportation in vertical fractures with controlled roughness in different positions
Available online 24 December 2025
Effective proppant placement is essential for increasing the production of unconventional oil/gas reservoirs. It can substantially affect the fracture roughness. This paper presents a laboratory fracture...
The impact of grid refinement, foam model, and peaceman model on gas and liquid injectivities during SAG foam EOR: An FFT benchmarking study
Available online 18 December 2025
Surfactant-Alternating-Gas (SAG) utilizes foam to reduce gas mobility and improve reservoir sweep efficiency in gas-injection enhanced oil recovery and carbon capture and storage. Although SAG is known...
Study on the phase behavior and mass transfer laws of CO2-shale oil in shale oil reservoirs
Available online 1 December 2025
Injecting CO2 into shale oil reservoirs has the dual purpose of enhancing oil recovery rate and geological storage of CO2. The phase behavior and mass transfer laws of the CO2-shale oil are crucial...
Application of neutron-X-ray dual-modal imaging in oil and gas well cementing under ultra-high temperature conditions
Available online 1 December 2025
Understanding the failure mechanisms affecting cement sheath integrity under ultra-high temperature (UHT) conditions is essential for ensuring wellbore integrity and supporting the safe and sustainable...
Large-scale visualized physical simulation of the occurrence and flow of condensate oil in fracture-vuggy condensate gas reservoir
Available online 30 November 2025
The Tazhong No. 1 condensate gas reservoir in Tarim Basin shows complex storage spaces and strong heterogeneity. To intuitively assess the production performance characteristics of the condensate gas...
Preparation and mechanistic analysis of high-selectivity water control systems
Available online 28 November 2025
This paper presents a highly selective water control system designed to address declining oil production in offshore wells caused by rising water cuts while overcoming the poor selectivity of current...
Data-driven real-time prediction of cutting's transport index in directional wellbores
Available online 28 November 2025
The drilling of non-vertical wellbores requires effective real-time monitoring techniques to improve drilling efficiency. This study innovatively develops nine robust hybrid machine learning (HML) models...
Pressure transient analysis of commingled multilayer reservoirs: A deconvolution-based approach for individual layer characterization using sparse PLT data
Available online 26 November 2025
Layering is common in hydrocarbon reservoirs due to stratified sedimentary deposition, with each layer exhibits distinct characteristics. Multilayer reservoirs are typically classified as systems with...
Fracture conductivity damage in shale oil reservoirs: Mechanism model and its impact on oil production
Available online 26 November 2025
Shale oil reservoirs often experience severe hydraulic fracture stress sensitivity and conductivity damage, leading to rapid production decline and low oil recovery. Understanding fracture damage mechanisms...
Integrated approach and insights into shale gas potential: Geological, petrophysical, geochemical, and geomechanical evaluation of the Khatatba Formation (Western Desert, Egypt)
Available online 26 November 2025
This study provides a comprehensive assessment of the shale gas potential of the Middle Jurassic Khatatba Formation in the Obaiyed Field, Western Desert, Egypt, by integrating geological, petrophysical,...
Experimental investigation of pressure, temperature, and salinity effects on the interfacial tension of H2/brine/cushion gases: Implications for H2 geo-storage
Available online 25 November 2025
Underground hydrogen storage (UHS) in saline aquifers is a promising solution for large-scale, long-duration energy storage in a low-carbon energy system. Cushion gases, such as N2, CO2, and CH4, are...