China National Petroleum Corporation (China)

Controlled Flexibility in Metal–Organic Frameworks for CO2 Capture: A Mini-Review from Selective Triggering to Process-Relevant Breakthrough Performance

Abstract Flexible metal-organic frameworks (MOFs) can translate small differences in gas-framework interactions into large adsorption responses through gate opening, breathing, or local site reconstruction. This review refocuses CO2 capture and separation in flexible MOFs on a si...

Geomechanical Characteristics of Cretaceous Ultra-Deep Sandstone Reservoirs in the Southern Keshen Area, Kuqa Depression: Implications for Exploration and Development

Significant progress has been made in exploring ultra-deep tight sandstone gas in the Tarim Basin, but sweet spot prediction remains challenging in the Keshen block of the Kuqa Depression. Based on integrated geological, experimental, and seismic data, this study characterizes th...

Random-Forest Prediction of Shear-Wave Slowness from Conventional Well Logs for Geomechanical Applications: A Two-Well Case Study

The aim of this study is to evaluate whether a random-forest model trained on conventional well logs can reconstruct missing shear-wave slowness (DTS) with sufficient transparency for downstream geomechanical calculations. Field-acquired DTS and 12 conventional curves from Well A...

Research on the Whirling and Vibration Characteristics of Steel–Titanium Alloy Composite Drill Strings for Ultra-Deep Wells

To address whirling- and vibration-induced failures in ultra-deep well drill strings caused by high slenderness ratios and complex loading conditions, this study establishes a nonlinear dynamic finite element model for a steel–titanium alloy composite drill string. The model is d...

Integrated field test and modeling study of CO2 geological storage with enhanced water recovery in Eastern Junggar Basin of Xinjiang

Xinjiang, a primary energy export hub in China, faces substantial carbon emission pressure and severe water scarcity, making CO 2 geological storage combined with enhanced water recovery (CO 2 -EWR) a win–win strategy to foster regional development and bolster national energy sec...

Evolutionary Weighted Hodge Laplacian Descriptors for rs-fMRI Brain Networks

Abstract Complex biological networks often exhibit multiscale organization that is not fully characterized by pairwise edge weights or fixed graph summaries, motivating compact descriptors that retain both topological and spectral information. Here, we present an evolutionary wei...

Spray‐Driven Corrosion‐Resistant Superhydrophobic Coating With Multiscale Particles Reinforcement and Its Applicability to Various Environments

ABSTRACT Insufficient mechanical strength and tedious preparation processes of corrosion‐resistant superhydrophobic coatings have long restricted their practical application. In this work, a superhydrophobic coating is proposed through the incorporation of multiscale micro‐glass...

Application of anisotropic frequency-dependent inversion to shale reservoirs in the Zhaotong Demonstration Area, Sichuan Basin

Abstract The accurate characterization of fracture density and gas saturation is crucial for successful shale gas reservoirs developments. We present an integrated approach that combines rock physics modeling with anisotropic frequency-dependent inversion to characterize shale re...

Research on the Application of Prefabricated Pavement Slabs in Non-Conventional Natural Gas Drilling Projects

In recent years, traditional cast-in-place concrete construction for pre-drilling engineering in unconventional natural gas fields has generated large amounts of waste concrete, consumed significant resources, and prolonged project schedules. To address these issues, this study p...

Mechanisms and Parameter Optimization of Pre-Fracturing Energy Enhancement in Ultra-Low-Permeability Tight Oil Reservoirs

Ultra-low-permeability tight oil reservoirs, including the Chang 6 and Chang 8 formations in the Changqing Oilfield and the Fuyu reservoir in the peripheral Daqing Oilfield, are characterized by poor reservoir properties and limited waterflooding efficiency. Conventional areal wa...

Study on the oil-water two-phase flow characteristics of tight reservoir based on digital core technology

Abstract Tight reservoirs are characterized by low porosity, low permeability and complex pore structures, resulting in poor waterflood recovery efficiency. Existing microscale two-phase flow studies are mostly based on two-dimensional geometric models, and the physical mechanism...

Mechanisms and safety assessment of support tilting for arch crossing pipelines in saline-alkali environments

To address the 3°-4° tilting issue of an arch crossing gas pipeline support structure in a saline-alkali wetland environment, a comprehensive quality evaluation of the pipeline and welds was performed using multiple non-destructive testing (NDT) techniques, including high-precisi...

Unraveling the Scale Effect on Fracture Plugging: A Quantitative Study from Lab-Scale Slots to Field-Scale Fractures via Hydrodynamic Analysis

Abstract Conventional core-scale laboratory fracture-plugging tests may overestimate the ability of granular lost circulation materials (LCMs) to form a complete plugging zone under field-scale conditions. This discrepancy arises because the effects of increasing fracture length...

Stratigraphy-guided Ensemble Smoother Multi-Data Assimilation for poststack seismic inversion

Abstract Poststack seismic acoustic impedance inversion is of vital significance in reservoir prediction. Nonetheless, conventional poststack seismic inversion approaches linearize the relationship between seismic response and acoustic impedance, which restricts their adaptation...

A Hybrid CNN-Transformer Network for Linear Noise Suppression in 3D Seismic Data

Abstract 3D seismic data acquisition, processing, and analysis have become increasingly prevalent in modern geophysical exploration. However, various types of coherent noise, especially linear noise, can cause serious interference and effective noise reduction techniques are crit...

Renewable oil-derived comb polymers as green and shear-resistant wax-crystal modifiers for high-wax crude oils

The formation of robust wax-crystal networks in high-wax crude oils during cooling leads to significant increases in viscosity, gelation, and restart stress, posing major challenges for pipeline transportation. Here, we present a renewable, oil-derived comb polymer strategy that...

A 200°C‐Tolerant Water‐Based Drilling Fluid for Ultra‐Deep Wells Using an Organic–Inorganic Multi‐Metal Hydroxide Modifier

ABSTRACT A water‐based drilling‐fluid (WBDF) formulation was developed for moderate‐density ultra‐deep intervals requiring thermal stability at 200°C. The optimized formulation contained 5 wt% APEG/sodium‐citrate‐modified quaternary Mg‐Al‐Fe‐Zn multi‐metal hydroxide (ASMH), 0.3 w...

Research on the Evolution of Wellbore Pressure During Managed Pressure Casing Running

With the continuous advancement of deep and ultra-deep well drilling technologies, formations with complex pressure windows are becoming increasingly common. During casing running operations, it is necessary to ensure both leak prevention in loss-prone formations and pressure sta...

Liquid CO2 Replacement and SequestrationBehavior after Depressurization Production of Methane Hydrates

Abstract Aligned with China’s “dual carbon” strategic objectives, natural gas hydrates─recognized as a crucial source of clean unconventional natural gas─constitute a significant technological avenue for securing national energy stability and meeting carbon reduction targets thro...

Diagenesis of UpperTriassic Chang 8 Sandstones, SouthwesternOrdos Basin, China: A New Insight into the Formation Mechanism ofChlorite and Calcite Cement

Abstract Authigenic minerals from Chang 8 sandstones can preserve a precise paleotemperature record. Petrographic observations and geochemical characteristics provide a new insight into the formation mechanism of chlorite and calcite and resolve the problems of mobile elements be...