Structural-state integrated modeling of multi-mechanism formation damage during drilling–completion
Available online 12 January 2026
To address the modeling fragmentation and predictive deviation caused by the conventional “single-mechanism, weakly coupled, additive response” approach in formation damage research, this study proposes...
Evolution process and controlling factors of gas content in marine-continental transitional shales: Insights from numerical modeling
Available online 12 January 2026
Marine-Continental Transitional shale (MCTS) gas holds excellent gas-generating hydrocarbon basis and exploration potential. Conducting quantitative analysis on the evolution of shale gas content and...
Insights of abrasive water jet slotting mechanisms in hard rock using CFD-DEM simulation
Available online 10 January 2026
Abrasive water jet (AWJ) slotting technology shows great potential for stimulating oil and gas reservoirs, particularly in hard rock formations. Understanding the transport mechanisms of water and abrasives...
Semi-supervised learning for AVO inversion with bidirectional spatial feature constraints
Available online 9 January 2026
Prestack amplitude variation with offset (AVO) inversion using one-dimensional convolutional neural networks often lacks lateral continuity. While two-dimensional methods improve this, they are limited...
Gelation and reservoir conformance control performance of in situ crosslinked polymer gels prepared with different crosslinkers
Available online 9 January 2026
In situ crosslinked polymer gels (ISCPGs) are widely applied in petroleum reservoirs for conformance control and water shutoff to improve oil recovery. However, the differences in gelation behavior...
Investigation of fracture pressure and EOR mechanisms during fracturing flooding in low-permeability sandstone using CT and NMR
Available online 9 January 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...
A high-temperature and high-strength polymer gel for plugging in fractured formations
Available online 7 January 2026
Lost circulation, the significant penetration of drilling fluid into formations during drilling, leads to excessive fluid consumption, non-productive time, and potential well control incidents. This...
Reutilization of regenerated exhaust gas from the centrifugation-filtration coupled purification system: a closed-loop process
Available online 6 January 2026
The regenerated exhaust gas was reutilized to configure a centrifugation-filtration coupled purification system (CFCPS), aiming to achieve a closed-loop gas purification process. It can be foreseen...
Hydrocarbon generation thermal simulation experiment of massive organic-rich tuff and laminar tuffaceous shale: A case study of the Chang 7 Member of the Ordos Basin
Available online 6 January 2026
The Chang 7 Member of the Yanchang Formation in the Ordos Basin consists predominantly of airfall and water-borne tuff along with tuffaceous shale, which exhibit considerable hydrocarbon potential,...
A novel application of a stepwise extraction protocol: resolving the challenge of biomarker detection in high-maturity shale systems
Available online 5 January 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...
Oxidative cracking performance of low maturity shales at different O2 concentrations
Available online 3 January 2026
Conventional in-situ conversion technologies including electrical heating or injection of hot fluid face development challenges. Low heat transfer efficiency and limited pore expansion restrict its...
Potential application of hydrophobically modified Welan gum as a novel thermo-salt tolerant EOR agent in high-temperature and high-salinity reservoirs
Available online 2 January 2026
Conventional polymeric systems face significant challenges in maintaining performance under high-temperature, high-salinity reservoir conditions due to limited thermal and saline stability. To address...
LLMs-guided parameters prediction of tight sandstone reservoirs
December 2025
Accurate prediction of reservoir parameters is essential for reservoir evaluation. Recent machine learning methods have spurred significant advancements in reservoir prediction; however, limited well...
Ag-doped ZnO nanoparticles synthesized by Bacillus subtilis induce ROS damage and apoptotic activities against sulfate-reducing bacteria cells in oilfields
December 2025
Green-synthesized nanomaterials are anticipated to be extensively applied to inhibit sulfate-reducing bacteria (SRB) in oilfields. Using Bacillus subtilis (B. subtilis) suspension as the raw material...
Preparation and performance evaluation of a sand inhibiting and water control agent based on supramolecular interactions
December 2025
To address two key challenges (sand production and high water cut) in the development of loose sandstone reservoirs, a supramolecular sand inhibiting and water control agent, PDKM, was prepared using...
Optimal fit clearance of control valve considering energy consumption based on loosely coupled fluid-solid interaction
December 2025
The wireless intelligent water distributor is an emerging technology increasingly applied in oilfields to enhance oil recovery. Although the system has many advantages, the high energy consumption of...
Imbibition mechanism analysis of modified black nanosheet and low salinity water composite system for enhanced oil recovery by NMR method
December 2025
Black nanosheets (BN, with a specific chemical composition of molybdenum disulfide) have been widely studied for low-permeability reservoir development due to their unique nanoscale dimensions and lamellar...
Quantitative evaluation of lateral sealing of faults in metamorphic rocks: A case study of Bohai Bay Basin in China
December 2025
The Archean buried-hill metamorphic reservoirs in the Bohai Bay Basin are examples of metamorphic rocks having faults with diverse strikes as a consequence of multi-phase tectonic evolution. For faults...
A stacking ensemble approach for pore pressure prediction in real-time during drilling based on mud log data
December 2025
The precise and real-time prediction of pore pressure is critical for optimizing drilling efficiency and mitigating the potential risks associated with drilling operations. In order to surmount the...
Experimental and simulation study of geochemical processes during interaction of carbonated formation water with terrigenous and carbonate rocks
December 2025
The paper addresses the issues of reducing the concentration of greenhouse gases in the atmosphere through carbon dioxide sequestration by injection to geological formations to enhance oil recovery...
Mobility evaluation of continental shale oil of the Permian Fengcheng Formation in the Mahu Sag: Reservoirs characteristics, multiple influencing factors and conceptual models
December 2025
Mobility is a crucial metric for assessing sweet spots of continental shale oil. However, due to the complexity of shale oil reservoirs characteristics and the lack of systematic analyses of factors...
Focusing mechanism and anisotropy correction of array induction logging responses for shale reservoirs in horizontal wells
December 2025
We have developed a novel method for correcting resistivity anisotropy in array induction logging (AIL) for shale reservoirs drilled with horizontal wells. This method is featured by two aspects: simplifying...
The heat-fluid-solid coupling erosion mechanism for the optimal spray distance and jet angle in high-pressure water jets
December 2025
Focusing on the conversion of pressure energy and internal energy under viscous dissipation, a heat-fluid-solid coupling method is established to study the flow and stress fields of 100 MPa submerged...
Optimization of rate of penetration through improved bit durability and extended directional nozzle
December 2025
The enhanced drilling parameters and custom-designed polycrystalline diamond compact (PDC) bits have greatly improved both rate of penetration (ROP) and footage. Then how to further improve the bit’s...
Electrorheological effect enhancement of waxy crude oil with graphene nanoparticles and its mechanism
December 2025
Electric treatment is a promising method to improve the cold flowability of waxy crude oil by taking advantage of the electrorheological (ER) effect of the crude oil. However, the efficacy of viscosity...