Yongkang Fu
Abstract.Driven by tightening decarbonization requirements in international shipping and persistent pressure on total cost of ownership, improving the efficiency of marine diesel engines remains a near- to mid-term cornerstone for fuel and greenhouse-gas reduction. This review summarizes the regulatory drivers and energy-efficiency metrics, discusses the underlying loss mechanisms in marine diesel engines, and provides an expanded overview of major energy-saving technology pathways, including combustion and injection optimization, advanced turbocharging and air handling, Miller-cycle-based cycle …
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Xinyu Zhu, Jianyu Chu
Abstract.The effectiveness of emergency response to earthquake disasters is crucial for the safety of lives and property. Unmanned Aerial Vehicles (UAVs), with their unique mobility, have emerged as a key force in reopening lifelines after earthquakes. However, the post-earthquake environment is fraught with multiple constraints, including building collapses, secondary disasters, restricted airspace, and urgent material demands, posing significant challenges to UAV path planning. To address these challenges, this research focuses on the core issue of "UAV path planning in multi-constraint environments …
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Hao Wu
Abstract.The traditional produced liquid is separated from oil and water at the combined station, but the process has large energy consumption, high operating costs, and some of the combined stations are small in treatment scale, which is difficult to adapt to the increasing water content treatment needs. The tubular separator is used to separate the high water content free water in the produced fluid of the well site to achieve "on-site separation and on-site reinjection", which is convenient and efficient. In this paper, the flow field characteristics and separation process of T-shaped pipe are …
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Yangbing Su
Abstract.To clarify the geological characteristics and sensitivity laws of the Chang 9 reservoir in the Wangwazi South area of the Wuqi Oilfield and to facilitate efficient development of the block, this paper conducts research by comprehensively applying methods such as core observation, thin section identification, mercury injection experiments, and sensitivity flow experiments. The results show that the study area is located on the western edge of the Yishan Slope in the Ordos Basin. The Chang 9 oil layer group reservoir is mainly composed of gray and dark gray fine-grained lithic feldspar …
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Baichuan Gong
Abstract.The field of civil engineering is undergoing a transformative shift, driven by the integration of advanced materials that possess capabilities beyond traditional concrete and steel. Smart materials, characterized by their ability to sense, respond, and adapt to external stimuli such as stress, strain, temperature, moisture, or magnetic/electric fields, are at the forefront of this revolution. This article provides a comprehensive overview of the major classes of smart materials relevant to civil infrastructure, including piezoelectric materials, shape memory alloys (SMAs), fiber optic sensors, …
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Shuxuan Jiang, Peiyu Lu
Abstract.This study focuses on the pulsation characteristics of gas-liquid two-phase flow in undulating pipe networks and adopts a one-dimensional model. The results show that the pulsation of gas-liquid two-phase flow causes an increase in pressure at the manifold inlets of each well accompanied by a certain degree of pulsation. The pulsation exhibits a significant wide-frequency distribution feature, where high-frequency pulsations are mainly caused by the operation of pumping units, and low-frequency pulsations originate from random slug flow of two-phase flow in undulating pipelines. Meanwhile, the …
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Peng Wei, Mingfei Li, Pengfei Yao, Geng Niu, Han Li
Abstract.This paper conducts a systematic design of the connection structure between the well control controller and the tubing hanger, focusing on in‑depth analysis and strength verification of threaded connection methods. A comparison is made among four common connection forms—threaded, flanged, clamped, and welded connections—in terms of their characteristics and applicable conditions. The threaded connection scheme is finally selected. Detailed descriptions are given on the tooth‑profile design, basic parameters, and tensile‑strength calculation methods for both API buttress threads and triangular …
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Cheng Liu
Abstract.In this paper, UAV remote sensing technology is a new spatial information acquisition technology that integrates UAV flight platform, high-sensitivity remote sensing sensors, high-precision navigation control system and intelligent data processing technology. With the core advantages of low-cost deployment, high maneuverability response, and centimeter-level high-resolution imaging, it effectively breaks through the dual limitations of traditional satellite remote sensing in terms of temporal resolution (easily obscured by clouds, long revisit period) and manned aviation remote sensing in …
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Xin Wen, Xiaomeng Li
Abstract.As global conventional oil and gas resources dwindle, unconventional resources have emerged as a crucial strategy for China's energy transition and reserve augmentation. Tight sandstone reservoirs, a type of unconventional formation, typically feature complex geology, varied and dynamic structures, and limited inter-pore connectivity, often resulting in low extraction efficiency. To enhance recovery rates from tight sandstone reservoirs, detailed studies of the reservoir's micro-pores are essential. Among these, quantitative evaluation of core micro-pores through laboratory experiments stands …
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Peiyu Lu, Shuxuan Jiang
Abstract.The formation of water-in-oil (W/O) emulsions during crude oil extraction leads to increased pipeline load, higher energy consumption, and elevated demulsification costs. CO₂ flooding technology can significantly improve emulsion stability by altering oil/water interfacial properties. This study investigates the influence law of CO₂ on the stability of W/O emulsions through experimental and theoretical analyses. Using a pressurized emulsification device and a high-speed microscopic observation system, combined with the water separation rate method and micromorphological analysis, the …
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Meixi Jiao
Abstract.This study evaluates the health opportunity costs associated with the allocation of global health resources toward pandemic prevention, preparedness, and response (PPPR) for COVID-19 compared to alternative investments in primary healthcare system strengthening. A central tension in global health policy involves the allocation of finite resources between vertical programs targeting specific diseases and horizontal investments that strengthen foundational health systems. This research addresses this critical resource allocation question by quantifying the health gains derived from $15.25 …
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Ziyang Gong, Jingyi Sun, Zirui An, Pengcheng Zhang, Junhao Jiao
Abstract.This paper proposes a novel approach for crop disease identification and severity grading based on deep learning models. The focus lies on utilizing lightweight convolutional neural networks (e.g., ResNet50) as backbone models for disease classification, while enhancing recognition performance under limited data through transfer learning and strong data augmentation techniques. First, a customized dataset was constructed and processed through data cleaning. A deep learning framework was employed to fine-tune pre-trained models, accomplishing the crop disease classification task. Second, a …
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Xiaolong Wang
Abstract.CO₂ foam fracturing fluids, commonly used in fracturing deep unconventional oil and gas reservoirs, currently suffer from poor stability, high friction resistance, and inadequate sand-carrying capacity. This study selected three base fluids: guanidine gel (traditional system), G509 surfactant composite system, and SCF novel polymer system. Testing was conducted using a high-temperature, high-pressure foam generator and a high-temperature, high-pressure rotational rheometer system.The stability, rheology, and sand-carrying properties of carbon dioxide (CO₂) foam fracturing fluids were …
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Guoxing Wang
Abstract.Idler rollers play a crucial supporting and guiding role in the operation of conveyor belts, and their state changes significantly affect conveyor belt misalignment. Studies have found a significant difference in the exposed area of the left and right idler rollers under misalignment and non-misalignment conditions. Based on this characteristic, this paper focuses on idler rollers and proposes a semantic segmentation algorithm based on MSBG-DeepLabV3+ idler rollers to achieve high-precision segmentation of the idler roller region, providing technical support for subsequent research on conveyor …
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Meng Wang
Abstract.With the intensification of the urban heat island effect, outdoor thermal comfort for residents has declined, making urban mountain parks a crucial refuge for seeking thermal relief during summer. Consequently, exploring strategies to regulate their thermal environment is urgent. As the core structural element of mountain parks, trail thermal comfort is significantly influenced by environmental factors such as slope gradient and aspect. However, current research on trail thermal comfort is predominantly focused on flat terrain, lacking in-depth exploration of complex micro-topographic factors. …
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Yutong Zhang, Mingfei Li
Abstract.With the advancement of coalbed methane exploration and development into deep formations and structurally complex areas, horizontal well technology has become a key means for the development of deep CBM. However, casing deformation problems occur frequently throughout its full life cycle, severely restricting the efficient development of horizontal wells. Based on existing literature, this paper systematically combs the core mechanisms of casing deformation in CBM horizontal wells from two major dimensions: geological factors and engineering factors. In terms of geological factors, the …
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Zebing Wu, Xiaochun Zhu, Kenan Liu, Zihao Zhang, Yifei Lin
Abstract.To address the seal failure and leakage problems of the pressurized cable crown sheave operating under high-pressure conditions of 35–50 MPa, 2D and 3D solid finite element models (FEMs) for the main sealing structure were established to investigate the sealing performance of the O-ring seal.As the fluid pressure increased to 50 MPa, the von Mises equivalent stress of the O-ring reached 16.588 MPa, which is close to the allowable stress limit of the material. Beyond this pressure threshold, the region with the maximum equivalent stress is prone to tearing, leading to seal …
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Haowei Qin, Jun Shao, Jiawei Wang, Qi Zhang
Abstract.This study presents a non-contact magnetic drive scheme designed to eliminate leakage at dynamic seals in Electric Submersible Centrifugal Pumps (ESPs) operating in high-temperature downhole environments (up to 200°C). The torque performance, magnetic field distribution, and eddy current losses of the proposed cylindrical magnetic coupling were investigated through integrated theoretical analysis and finite element (FE) simulations. A magnetic torque formula was derived theoretically, leading to the selection of Samarium-Cobalt (SmCo) permanent magnets and the determination of their axial …
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Zebing Wu, Zihao Zhang
Abstract.Aiming at the problems of low rock-breaking efficiency in hard formation and low service life of PDC bits caused by stick-slip vibration of drilling tools, in order to further study the rock-breaking characteristics of PDC cutting teeth and improve their rock-breaking efficiency, based on elastoplastic mechanics and Drucker-Prager rock failure criteria, The ABAQUS/Explicit module was used to establish the interaction model between PDC cutting teeth and rocks under the combined impact of axial torsion. The differences between conventional teeth and axe-shaped teeth in terms of displacement, …
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Wenjie Liu
Abstract.Coal and gas outburst is one of the most destructive dynamic disasters in coal mining, posing a severe threat to coal mine safety production and miners' lives. This paper systematically summarizes the research status of coal and gas outburst early warning technologies. Firstly, it elaborates on the mechanism of outbursts and the theoretical basis for early warning; then, it focuses on analyzing early warning methods based on the fusion of multi-source information such as gas emission dynamics, acoustic emission/microseism, electromagnetic radiation, and geophysical methods, and comments on …
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Yong Deng, Chaojian Qin
Abstract.Addressing the challenges of complex signal characteristics and difficult fault type differentiation in ultrasonic detection, a fault classification method based on Particle Swarm Optimization Support Vector Machine (PSO-SVM) is proposed. This method utilizes the particle swarm optimization algorithm to globally optimize key parameters in the support vector machine model, overcoming the limitations of traditional support vector machines, such as relying on experience for parameter selection and unstable classification performance. Taking experimental data collected from ultrasonic detection as …
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Wanfu Liu, Xiao Xiong, Xun He
Abstract.With the development of social economy, the service mileage of oil and gas pipelines is increasing, and their service life is gradually extending. This article analyzes the types of pipeline failures and their solutions, including third-party mechanical damage, corrosion damage (external and internal corrosion), and the impact of natural disasters on pipeline safety. These issues directly threaten the stability and safety of pipeline operations. In terms of key technologies, it details the application of real-time monitoring technology, anti-corrosion coating technology, advanced materials, …
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Zetao Sun
Abstract.With the continuous rise in global energy demand and the gradual depletion of onshore conventional oil and gas resources, the development of offshore heavy oil resources has become a key strategic direction for the petroleum industry. Heavy oil reserves account for a relatively high proportion of total oil reserves in China's Bohai Sea area. This type of resource is characterized by high viscosity and poor fluidity, resulting in extremely low recovery rates with conventional mining technologies. Therefore, cyclic steam stimulation (CSS) is widely used as the mainstream thermal recovery …
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Xingyu Hou, Linwei Li, Yanxiong Liu, Yan Chen
Abstract.Carbonate reservoirs are among the most important carriers of global hydrocarbon resources. However, the accurate identification and quantitative characterization of their core storage space—the fracture–cavity system—remain a long-standing global challenge in petroleum exploration and development. Over the past decade, rapid advances in artificial intelligence (AI), particularly machine learning (ML) and deep learning (DL), have provided transformative tools to address the characterization difficulties arising from the strong heterogeneity and multiscale nature of carbonate reservoirs.This …
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Anyue Zhou
Abstract.With the increasing cross-cultural dissemination of medical documentaries, their subtitling translation plays a pivotal role in promoting the popularization of professional knowledge and facilitating humanistic exchange. Grounded in the theory of multimodal discourse analysis, this study examines the subtitling translation of the medical documentary Baby Surgeons, exploring how medical information and narrative emotion are reconstructed and conveyed in translation through the synergistic interplay of visual, auditory, textual, and other multimodal semiotic resources. The research begins by …
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Yi Zhang, Zhen Wang, Daqin Zhang, Bangyao Tang
Abstract.Sand washers play a crucial role in the oil drilling field. To improve the drilling cuttings screening efficiency of sand washers, it is necessary to optimize the structure of the sand washer's vibrating screen. This paper takes the vibrating screen of the sand washer as the research object and investigates how its screening performance is affected by multiple factors such as amplitude, frequency, vibration mode, and screen mesh. Firstly, the CFD-DEM method is adopted for numerical simulation to study the influence of the vibration parameters of the sand washer's vibrating screen on the …
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Qi Zhang, Jun Shao, Jiawei Wang, Haowei Qin
Abstract.In view of the problems such as leakage, water hammer impact and severe wear of mud pump valve seats under harsh working conditions, this paper takes the new hydraulic end valve seat as the research object, selects key design variables, and constructs a multi-objective optimization model with the goals of minimizing leakage, peak water hammer pressure and wear. Through single-parameter analysis and multi-parameter coupling optimization, the influence laws and coupling effects of parameters on performance are revealed, and the performance of related optimization algorithms is compared and …
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