Northeast Petroleum University

Study on the synthesis of salicylaldimine nickel catalysts and their catalytic performance in ethylene oligomerization

A series of salicylaldimine ligands with different electronic effects and their corresponding nickel complexes were synthesized and characterized by FT-IR, UV-vis,1H NMR, TG, and MS. The ethylene oligomerization performances of the nickel catalysts were evaluated in cyclohexane....

Physics-Guided and Horizon-Aware Dynamic Liquid-Level Identification and Forecasting in Oil Wells Using Distributed Temperature Sensing

Accurate dynamic liquid-level monitoring in rod-pumped oil wells requires not only reliable identification of the gas–liquid interface from distributed sensing data but also stable forecasting over extended horizons. This study develops a physics-guided and horizon-aware PatchTST...

Coupled CFD–DEM analysis of soil cavity formation and gas diffusion during buried pipeline leakage

Abstract After the leakage of a buried pipeline, the overlying soil structure deforms under the high-speed impact of escaping gas, influencing both leakage and diffusion behaviours. This deformation typically appears as a soil cavity above the leakage port, especially in medium-...

ViSSR: Physics-Informed Hybrid Vision-LSTM/State-Space Super-Resolution for Digital Rock Microstructure Analysis

Digital Rock Physics (DRP) requires high-fidelity pore-scale imaging, yet micro-computed tomography (μ-CT) trades spatial resolution against field of view, and standard super-resolution (SR) often fails to preserve transport-controlling pore topology. We propose Vision-LSTM and S...

Numerical simulation study on critical liquid and sand carrying velocities of gas-liquid-sand multiphase flow in vertical and horizontal wellbore sections

A segmented simulation is used to examine flow behaviors in vertical and horizontal shale-oil wellbores. Built with Poly-Hexcore meshing, the model couples Euler-Euler and KTGF approaches, and incorporates the Dranchuk-Abu-Kassim equation for real-gas compressibility along with a...

Corrosion–Fatigue Damage Characteristics and Evolution Mechanisms of Failed Sucker Rods

Sucker rods operate under long-term cyclic loading while being exposed to produced fluids, making corrosion–fatigue damage an important integrity concern in rod-pumped wells. This study applied a field-scale multi-source evidence framework to produced-fluid samples from 16 sucker...

Navigating the digital frontier: unveiling the critical thresholds and strategic conditions for innovation performance in healthcare organizations

Purpose This research aims to examine the effects of digital technology integration, dynamic capabilities and technological orientation on the innovation performance of China’s healthcare organizations. Design/methodology/approach Based on the dynamic capabilities view, this rese...

Pore Pressure Prediction in Tight Sandstone Reservoirs with a Hybrid BiLSTM-CNN Model

Accurate pore pressure estimation in tight sandstone reservoirs is hampered by the limited sensitivity of conventional approaches, which rely on a single acoustic or resistivity log and assume shale undercompaction as the dominant overpressure mechanism. This study develops a hyb...

Mechanisms of Water-Lock Removal by a Nanoemulsion/Mud Acid Composite System in Low-Permeability Sandstone Reservoirs: Insights from Pore-Scale Characterization in the MB Block

Abstract Water-lock damage in low-permeability sandstone reservoirs is primarily caused by small pore-throat structures, strong capillary forces, and hydrophilic rock surfaces. Conventional treatment methods mainly target either fluid-interface modification or pore blockage probl...

Optimization of Polymer-Flooding Parameters and Front Propagation Behavior in the Central-Western Block I of the Lanan District

Abstract To clarify the propagation behavior of the polymer-flooding front in highly heterogeneous, high-water-cut reservoirs, polymer-system screening, plugging-performance evaluation, and one-dimensional and three-dimensional saturation-monitoring displacement experiments were...

Mismatch between oil abundance and apparent displacement response in lacustrine shales: The role of wettability in the Triassic Chang 73 shale, Ordos Basin

Oil abundance alone does not fully describe displacement behavior in lacustrine shales. Here, we examine how this behavior varies with wettability. We investigated 37 core samples obtained from the third submember of the Chang 7 Member (Chang 7 3 ) of the Upper Triassic Yanchang...

Influencing Factors and Mechanism of CO2 Trapping and Storage in Tight Sandstone Reservoirs Based on Fractal Characteristics of Pore Structure

To mitigate global warming induced by excessive carbon dioxide emissions, carbon dioxide displacement technology for carbon utilization and storage has attracted growing attention. In this paper, laboratory displacement experiments combined with Nuclear Magnetic Resonance (NMR),...

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...

Deep Network Reparameterized Full‐Waveform Inversion From Sequential to Simultaneous Sources With Adjoint‐State Method

Abstract Full‐waveform inversion (FWI) relies on sequential‐source (SQ) workflows for high imaging precision, while simultaneous‐source (SML) encoding drastically accelerates computation but introduces irreversible wavenumber discontinuity artifacts in hybrid‐domain implementatio...

Bottom-Hole Pressure Optimization in Marine-Continental Transitional Shale Gas Reservoir Considering Stress Sensitivity

Abstract The bottom-hole pressure (BHP) directly affects the stress state in formation, which in turn affects the productivity of hydraulically fractured horizontal wells. In this study, the porosity and permeability stress sensitivity experiments were conducted on different mari...

Pore and mineral controls on petrophysical anomalies in undercompacted mudstones

Abstract In mudstones, undercompaction inhibits grain rearrangement, preserving pores and generating anomalous petrophysical responses. These anomalies typically manifest in geophysical exploration as abnormal acoustic and resistivity logs. However, the microstructural difference...

Dual-Mode Responsive Dynamic Afterglow Color in CarbonDots and Carbon Nitride Composite for Advanced Optical Informationand Temperature Sensors

Abstract Responsive dynamic afterglow carbon dot (CD) materials, which can continuously emit light of dynamically varying color after excitation cessation, promise broad applications in advanced information encryption and related fields. However, as most reported CD-based aftergl...

Field-Scale Simulation of CO2 Water-Alternating-Gas Enhanced Oil Recovery in a Mature Waterflooded, Low-Permeability, and Highly Heterogeneous Reservoir

Water flooding in low-permeability, highly heterogeneous reservoirs often causes a rapid increase in water cut and inefficient pressure maintenance because injected water preferentially flows through high-permeability channels. In this study, a field-scale compositional simulatio...

Counterfeit Governance Strategies in E-Commerce Platforms from a Systems Perspective: An Evolutionary Game and System Dynamics Approach

Background: Counterfeit governance in e-commerce platforms is a real-world problem characterized by strategic interdependence, information asymmetry and dynamic feedback among platforms, merchants and consumers. Linear or single-actor regulatory approaches are often insufficient...

Research on Calculation Methods for Flow Distribution and Pressure Loss of Reaming-While-Drilling (RWD) Tools

As global oil and gas exploration advances into deep reservoirs, reaming-while-drilling (RWD) tools (hereinafter referred to as the reamer) are widely used to enlarge wellbores for unconventional well structures, prevent stuck pipe caused by formation shrinkage, and improve cemen...