China National Petroleum Corporation (China)

Experimental study on methane hydrate formation in the presence of sodium dodecyl sulphate under the influence of different physical properties of silica and composite systems

Abstract Natural gas hydrates naturally occur in pores of porous media. This study presents the first systematic investigation of methane hydrate formation in sub‐millimetre silica particles (0.4 and 0.7 mm) and larger sizes (1, 2, and 3 mm) as benchmarks. The combined matrix (0....

Origin and Source Correlation of Permian Hydrocarbons in the Kekeya Area, Southwestern Tarim Basin, China

The Southwestern Depression of the Tarim Basin has considerable petroleum exploration potential, and several hydrocarbon accumulations have been discovered in Permian reservoirs of the Kekeya area. However, the sources of Permian crude oils and the genetic types of natural gases...

Weighted Analysis of Corrosion-Inducing Impurities in Supercritical CO2 Transportation System

The degradation of carbon steels in supercritical carbon dioxide is significantly influenced by impurities, yet a comprehensive understanding of the corrosion mechanism and unified industry standards remains lacking. In response to this challenge, an impact factor weight analysis...

Quantitative characterization and controlling factors of organic pores in deep marine shale: A case study of Wufeng–Longmaxi Formation, South Sichuan Basin

The strong heterogeneity of deep shale reservoirs poses significant risks to exploration and development. This study is significant for shale gas exploration buried over 3500 m. Based on geochemistry, scanning electron microscopy (SEM), low-temperature nitrogen adsorption (LTNA),...

Vibration characteristics analysis and vibration suppression of shaft system based on multivariate nonlinear factors

Shale-gas reciprocating-compressor shaft systems are subject to coupled bending-torsional vibration produced by alternating loads and interacting nonlinearities, which challenges reliable vibration prediction and safety-oriented design. This study proposes a unified multi-nonline...

Multi-Objective and Dynamic Optimization on Fast Charging Strategies for Lithium-Ion Batteries Based on MCC-CV

The widespread deployment of lithium-ion batteries (LIBs) in electric vehicles and energy storage systems urgently requires advanced fast-charging strategies that simultaneously improve charging efficiency and cycle durability. Traditional multi-stage constant-current constant-vo...

Geochemical Characteristics and Oil–Source Correlation Analysis: A Case Study of Jurassic to Paleogene Source Rocks and Paleogene Oils in the Tajik Basin

The Tajik Basin is rich in oil and gas resources, but no analysis of the geochemical characteristics of source rocks and oil has been conducted since the Soviet era, leaving its hydrocarbon generation potential unclear. Through field outcrop sampling and organic geochemical analy...

Frictional characteristics and drag-reduction optimization of flexible drill strings in offshore ultrashort-radius sidetracking wells

Offshore ultrashort-radius sidetracking is an important re-entry and infill-drilling technique for exploiting remaining reserves in mature offshore fields and improving platform-based field redevelopment efficiency. However, in offshore sidetracking wells with large local curvatu...

Tracing Shale-Gas Migration in Complex Tectonic Settings: Evidence from Carbon-Isotope Fractionation Patterns

Abstract Late-stage tectonic deformation strongly influences shale-gas preservation and redistribution, but conventional methods rarely resolve gas-migration pathways and directions. Here, we test whether the direction of spatial carbon-isotope gradients can indicate the dominant...

AM / SA / AMPS / NVP Crosslinked Copolymer Gel for Lost Circulation Control at 140°C in High‐Salinity Fractured Formations

ABSTRACT Conventional polymer gels may suffer from thermal degradation and salt‐induced changes under severe downhole conditions. In this study, an AM/SA/AMPS/NVP crosslinked copolymer gel was synthesized by aqueous free‐radical polymerization using MBA as the crosslinker. The fo...

Mechanisms of Overpressure Formation and Distribution Prediction in Ultra‐Deep Carbonate Reservoirs in the YB Area, Sichuan Basin

ABSTRACT Understanding the formation mechanisms and predicting the distribution of abnormally high pressure in marine carbonate reservoirs are fundamental to ultra‐deep hydrocarbon exploration. This study investigates the ultra‐deep carbonate grain‐beach reservoirs of the second...

Analysis of Smoke-Spread Characteristics in Electric Vehicle Fires in a Two-Lane Tunnel with an Arched Ceiling

With the rapid increase in electric vehicle ownership, fire risks associated with electric vehicles in tunnels have attracted increasing attention. In this study, a numerical model of an electric vehicle fire in a two-lane tunnel with an arched ceiling was established using the F...

Impact of Fatigue on Mind-Wandering in Drilling Crews for Engineering Safety: A Lab-in-the-Field Experiment

Abstract Fatigue among drilling crews significantly impairs their attentional capacity and physiological functioning, potentially triggering a mind-wandering (MW) state that may ultimately lead to serious accidents. However, the underlying brain network mechanisms through which f...

High-Entropy Metal Sulfides with Enhanced d-Orbital Coupling for Boosted Sodium Storage Performance

Abstract The advanced high-entropy configuration approach is employed to stabilize the structural integrity of transition metal sulfides during cycling by suppressing volume expansion. This configuration simultaneously preserves abundant active sites and maintains high electronic...

Recent Advances in Lithium Sulfide Preparation Routes: Thermodynamics, Phase Behavior, and Scale-Up Challenges

Abstract The scalable and low-cost preparation of Li2S with application-appropriate purity and particle characteristics remains a major bottleneck restricting the industrialization of next-generation solid-state and lithium–sulfur (Li–S) batteries. This paper systematically revie...

Predicting Engineering-Defined Failure Risk Levels of Metal-Loss-Related Pipeline Girth Weld Defects Under Incomplete Engineering Data

Predicting engineering-defined failure risk levels for pipeline girth welds …is challenging because engineering records may be incomplete Conventional models often struggle with incomplete engineering inputs, as standard imputation pipelines tend to treat estimated values as equa...

Kinetics of methane hydrate formation in rhamnolipid solution

Abstract Solidified natural gas (SNG) offers a promising route for natural gas storage and transportation, but its practical application is hindered by slow hydrate formation kinetics and the environmental concerns of chemical surfactants. This study investigates the environmenta...

Star polycation nanocarrier selectively enhances mesotrione control efficacy via reduced particle size and improved foliar absorption

Abstract BACKGROUND Nanocarrier‐based formulations offer a superior means of enhancing control efficacy and increasing utilization. Star polycation (SPc) was an efficient nanocarrier of insecticides and fungicides. However, whether it could serve as an herbicide nanocarrier needs...

Novel Technique to Enhance Hydraulic Fracture Permeability by Controllable Biomimetic Mineralization: Transitioning from Liquid Injection to Solid Propping

Abstract Unconventional oil and gas have been playing an increasingly important role in the global energy market. The primary development technique for shale and tight reservoirs is hydraulic fracturing, which aims to create high-permeability channels propped by quartz sand or ce...

Experimental study on chemical plugging of weakly consolidated sandstone by geothermal tailwater recharge based on artificial cores

ABSTRACT Flowchart of experimental and simulation study on chemical clogging in weakly consolidated sandstone during geothermal tailwater recharge, including artificial core reinjection tests, X-ray diffraction, ion concentration measurements, PHREEQC simulation, and resulting cl...