Daqing Oilfield General Hospital

Modeling Offshore Fire Impact Induced by Subsea Hydrogen Releases

Abstract Offshore hydrogen production has developed rapidly in recent years. Accidental hydrogen releases in offshore environments threaten the safety of hydrogen supply chain. A mathematical model of sea-surface fire induced by subsea hydrogen release is developed using computat...

Multiscale Heterogeneity and Pore–Throat Controls on Upper Paleozoic Tight Sandstone Reservoir Quality in the Northern Yanchang Gas Field

Reservoir evaluation in the northern Yanchang Gas Field is complicated by variable permeability within low-porosity Upper Paleozoic sandstones. This study compares the He 8, Shan 1, Shan 2, and Benxi intervals using core petrophysical summaries, formation- and well-level heteroge...

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...

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...

Effect of Fe3O4 Nanoparticle Size on the Performance of Magnetic Nanocomposite Pour Point Depressants

Waxy crude oils exhibit poor low-temperature flowability due to wax crystallization and the formation of a three-dimensional gel network, leading to operational challenges in production and transportation. In this work, a series of Fe3O4@ethylene–vinyl acetate (EVA) nanocomposite...

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...

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...

Interfacial Tensions of Extended Surfactant Solutions: Effect of Alkane Chain Length on the Size of Propylene Oxide Groups

Abstract To explore the mechanism for lowering interfacial tension by extended surfactants, the interfacial tension values of extended surfactants (S–C13POnS and G-C16POnS) were measured using the spinning drop method. Additionally, molecular dynamics simulation was employed to v...

OGTT ‐Derived β‐Cell Function–Based Stratification of 2‐Year Glycaemic Transitions in Chinese Adults With Prediabetes

ABSTRACT Aims Prediabetes is heterogeneous, with variable progression to diabetes or reversion to normoglycemia. We evaluated whether the insulin secretion‐sensitivity index‐2 (ISSI‐2), an oral glucose tolerance test (OGTT)‐derived integrated surrogate of β‐cell function relative...

Integrated Dynamic Evaluation and Prospect Screening for Infill-Well Optimization in a Tight Sandstone Gas Reservoir

As a typical tight sandstone gas reservoir, the study area has entered a production-decline stage after years of development, and well pattern infilling has become a key means of improving the recovery factor. A cluster-analysis-based classification divided the reservoir into thr...

Characteristics and flow measurement of gas-liquid two-phase counter-current flow in vertical annulus

Abstract Gas-liquid two-phase counter-current flow in vertical annulus is involved in multiple industrial fields, due to the influence of the inner pipe, there are difficulties in measuring gas-liquid flow rates. To solve this problem, this paper proposes a new method for two-pha...

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...

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...

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...

Preparation of Salt‐Resistant Gemini Surfactants via Ethylene Oxide Group Regulation for Enhanced Oil Recovery

ABSTRACT Conventional anionic surfactants generally exhibit poor salt tolerance and reduced interfacial activity under high‐salinity reservoir conditions, limiting their application in enhanced oil recovery (EOR). To address this issue, a series of anionic–nonionic isotridecanol...

Control Mechanism of Water Shield on Pressure Dynamics of CO2 Huff-n-Puff and Crude Oil Mobilization Effect in Tight Reservoirs

Tight oil reservoirs are characterized by poor petrophysical properties, ultra-low permeability, and limited pressure-transmission capacity. After hydraulic fracturing, retained fracturing fluid can accumulate near the fracture–matrix interface and form a water shield, which rest...