Influence factors of long-term stability of silica-enriched Portland cement under ultrahigh temperatures
Available online 1 June 2026
Downhole high-temperature and high-pressure (HTHP) conditions can cause significant deteriorations of well cement, posing a major risk to wellbore integrity. A comprehensive experimental program is...
Microscopic forces between methane hydrate particle and droplet-wetted sand grain surface in a high-pressure system: Experiments and mechanisms
May 2026
Solving the issue of hydrate formation and blockage in pipelines during deepwater oil and gas development and hydrate-based green energy extraction is a crucial flow assurance safety concern. The micro-forces...
Reutilization of regenerated exhaust gas from the centrifugation-filtration coupled purification system: a closed-loop process
May 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...
Oxidative cracking performance of low maturity shales at different O2 concentrations
May 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
May 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...
Effect of CO2 pre-injection on fracture propagation morphology in shale reservoirs under CO2 hybrid fracturing
May 2026
Supercritical CO2 fracturing, as a waterless fracturing technology, is attracting increasing attention in the shale oil reservoir development industry. In recent years, a novel CO2 hybrid fracturing...
Source and thermochemical sulfate reduction of natural gases in the Ordovician carbonate–evaporite assemblage in the Ordos Basin, China
May 2026
Thermochemical sulfate reduction (TSR) commonly occurs in carbonate–evaporite assemblages, making the identification of gas sources difficult. Given that the sources of natural gases in the Ordovician...
A new approach for analyzing the formation and evolution of the Mesoproterozoic petroleum system in the Ordos Basin, China: Insights from a nested simulation with local grid refinement
May 2026
The study on Meso–Neoproterozoic petroleum systems has attracted extensive attention. However, it still faces some problems such as the availability of hydrocarbon accumulating elements, complexity...
A model for shale gas flow and permeability leveraging coupled transport mechanisms
May 2026
The extraction of shale gas is challenged by complex flow mechanisms and significant microscale effects within nanoscale pores. Existing models often overlook key flow mechanisms such as end effects,...
Microscopic experiments and simulations of CO2 huff-n-puff displacement mechanism considering heterogeneity and fractures
May 2026
Heterogeneity and fractures significantly influence oil and gas migration. However, current research remains insufficient in clearly visualizing CO2 displacement mechanisms under such reservoir conditions....
Techno-economic co-optimization of CO2 enhanced oil recovery strategies in a tight oil reservoir using coupled improved evolutionary algorithm and machine learning framework
May 2026
Massive carbon dioxide (CO2) emissions drive climate change. Injecting CO2 into unconventional reservoirs achieves both enhanced oil recovery (EOR) and geological sequestration. However, simultaneously...
Semi-supervised learning for AVO inversion with bidirectional spatial feature constraints
May 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...
Coordinate-transformation-based fast sweeping method for the factored eikonal equation on triangular meshes
May 2026
Accurate traveltime computation in complex geometries is crucial for seismological applications such as traveltime tomography and migration. However, eikonal solvers relying on finite-differences encounter...
Wax deposition characteristics under oil-water two-phase stratified flow in pipeline
May 2026
Wax deposition in subsea pipelines transporting waxy crude oil under oil-water stratified flow remains a critical flow assurance challenge. This study systematically investigates wax deposition characteristics...
Gas-solid two-phase flow erosion of needle throttle valve in shale gas field based on CFD-DEM model
May 2026
Needle throttle valve (NTV) is a key equipment to ensure the safe production of shale gas fields, but it is often seriously eroded by the solid particles in the produced gas. At this work, the CFD-DEM...
Insights into the charging behavior of tight oil under nanoscale confinement effects
May 2026
As conventional oil dwindles, tight oil gains importance for its vast potential. The physical property limit refers to the minimum pore size at which reservoir fluid can be charged under a defined accumulation...
MSA-DETR: Multi-scale attention enhanced DETR for object detection in oilfield surveillance
May 2026
In modern petroleum engineering, ensuring operational safety at drilling sites is of critical importance. Visual object detection plays a key role in intelligent safety monitoring systems by enabling...
Effects of salinity variations on shale imbibition behavior: Insights into the microscopic mechanisms
May 2026
Shale reservoirs contain abundant micro/nanoscale pores, which facilitate capillarity-dominated imbibition as an effective mechanism for enhancing hydrocarbon recovery. During hydraulic fracturing,...
Oil-gas conditions of the Proterozoic metamorphic basement reservoirs in the Wensu Salient, Tarim Basin, China
May 2026
In 2017, Well XWD1 drilled in the Wensu Salient, northwest Tarim Basin achieved the first hydrocarbon discovery in Proterozoic metamorphic rocks within the western basin of China. However, uncertainties...
Evolution process and controlling factors of gas content in marine–continental transitional shales: Insights from numerical modeling
May 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...
Adaptive weight strategy for frequency-decomposed seismic attribute fusion in predicting of complex sand body distributions
May 2026
High-precision sand prediction is fundamental to improving the efficiency of oil and gas exploration and development. To address the limitations of traditional fixed-weight fusion strategies, particularly...
Experimental study of the flow characteristics of surfactant-assisted aerosols in low permeability porous media
May 2026
Gas channeling in formations is a primary factor affecting the effectiveness of gas flooding and CO2 geo-storage. Current dominant methods for controlling gas channeling include water-alternating-gas...
Molecular insights into asphaltene desorption from silica surface by ionic and non-ionic nitrogen-based additives
May 2026
The strong adsorption of asphaltenes on reservoir minerals is a major constraint on heavy oil recovery. Although some nitrogen-based chemicals have shown promise in desorbing asphaltenes, their working...
Hydraulic-mechanical analysis of induced stress change in unconventional reservoirs using a novel fundamental solution of poromechanics in a half space
May 2026
The production of fractured unconventional reservoirs induces stress changes, which will affect the production performance of neighboring wells. To quantify such effects, the analytical solution is...
