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SSrN 2023年

作者： Jiang, Jingjing Tang, Yongfan Huang, Lihua Peng, Lincai Xu, Yong Wei, Guofeng Li, Yinan Research Institute of Natural Gas Technology PetroChina Southwest Oil and Gasfield Company Sichuan Chengdu China National Energy R&D Center of High Sulfur Gas Exploitation Sichuan Chengdu China High Sulfur Gas Exploitation Pilot Test Center CNPC Sichuan Chengdu China PetroChina Southwest Oil and Gasfield Company Sichuan Chengdu China Central Sichuan Oil and Gas District PetroChina Southwest Oil and Gasfield Company Sichuan Suining China

One of the most economical and effective approaches to protecting metal pipes in the oil and gas industries is to employ corrosion inhibitors. The solubility or dispersity of many corrosion inhibitors with long alkyl chains in aqueous water, however, presents a challenge. In this study, nano-emulsification technique was developed to improve the corrosion inhibitors' dispersity in corrosive water. Using dynamic light scattering (dLS), the influence of formulation on the droplet diameter was investigated, and the dispersion in the water was visually examined. Then, using weight loss measurements and electrochemical tests, the inhibition performances and mechanisms in the H2S/CO2 containing 5.0 wt% NaCl solution were investigated. The morphology and composition of corrosion products were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) methods. The results of the comparison investigation demonstrated that, in terms of inhibition efficiency, the corrosion inhibitor encapsulated in nanoemulsions was comparable to the system employing ethanol and liquid paraffin as solvents, both exceeding 90%. Moreover, its dispersion performance in water was significantly better than that of the paraffin oil system, and the required injection amount was considerably lower than that of the ethanol system. Further experimental results indicated that the nanoemulsion system was more consistent with the Freundlich adsorption model, unlike the other two systems which follow the Langmuir adsorption model. Finally, the SEM and XPS results demonstrated that the nanoemulsion system does not change the material type of corrosion products, but it seems to have a visible influence on the morphology. These findings suggest that nano-emulsification technique has the potential to be improved the solubility or dispersity of oil soluble corrosion inhibitor, which can extend its application fields. © 2023, The Authors. All rights reserved.

关键词： Corrosion inhibitors

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Experimental study on the creep behavior of shale in uniaxial compression test 54

Experimental study on the creep behavior of shale in uniaxia...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Gao, dewei Yang, Henglin dong, Jingnan Chen, Mian Hou, Yanan Li, Jun Sichuan Changning Natural Gas Development Co. LTD Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China Beijing China China University of Petroleum-Beijing Beijing China

In oil and gas well engineering, shale creep plays an important role in both the borehole stability and the crack closure of the after-fracturing process. In this study, the creep behavior of matrix shale in uniaxial compression test is experimentally examined. Both uniaxial compression tests and uniaxial compression creep tests are conducted on small-scale specimens using Gatan micro-testing system. Several constant-load stages are carried out before the stress raise above the threshold. The results show that the matrix shale have a creep threshold, below which the specimens exhibit distinct primary creep stage and secondary creep stage. Above the threshold, the specimen is in accelerated stage, in which the creep strain increased in an exponential manner. results also show that the specimens of regular uniaxial compression strength tests conducted within several minutes exhibited one main crack, which dominated the failure pattern. The specimens of creep tests that are conducted over tens of hours are crushed into lots of fine parts. The development of micro cracks dominates in the creep tests. The comparison between uniaxial compressive strength and creep threshold value show that the threshold value may be higher than the UCS value if the specimen is in constant-load mode for tens of hours. The results are limited to USC tests because the propagations of the microcracks might be hindered in triaxial tests. This study provides evidence of the subcritical propagation and blunting of the micro cracks in creep test. The results also provide better understanding of the creep shale behavior under uniaxial compression. It may help researchers know more about the creep behavior of well borehole and the crack closure of shale. © 2020 ArMA, American rock Mechanics Association

关键词： Creep

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A novel robust active damping control strategy based on H∞ loop shaping for the grid-tied LCL inverter

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Frontiers in Energy research 2024年 12卷

作者： Sang, Wenju Guo, Wenyong Xu, Gang Wei, Tongzhen Shi, Changli Liu, Zongjie Xue, Han He, Zhenning Li, Junzhi Shen, Jiazhen Min, ruiqi Song, Shaobo Li, Xiaoxu Hong, Yun Institute of Electrical Engineering Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China School of Electrical Engineering Bejing Jiaotong University Beijing China Shanghai Institute of Satellite Engineering Shanghai China State Grid Shandong Electric Power Company Jinan China R&D Department at Hiconics Eco-energy Technology Co. Ltd. Beijing China

LCL-type grid-connected inverters have been widely used in renewable power generation due to their size and cost advantages. However, the LCL filter has a problem of insufficient damping, which may lead to power system instability. Two common methods are used to address this problem: passive damping (Pd) and active damping (Ad). Pd methods suppress resonance by adding resistors to the LCL filter, but this approach increases system losses. Ad methods enhance damping through control to suppress resonance. Existing Ad methods are often significantly affected by grid-side inductance perturbation, resulting in insufficient robustness. To address this issue, this article proposes a novel robust active damping (rAd) control strategy based on H∞ loop shaping. Simulation analysis and experimental research show that the rAd control method exhibits superior robustness compared with the traditional capacitor current active damping control. Copyright © 2024 Sang, Guo, Xu, Wei, Shi, Liu, Xue, He, Li, Shen, Min, Song, Li and Hong.

关键词： damping

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5G Wireless Network Security: Investigating Next-Generation Mobile Communication data Encryption Methods and Authentication Protocols 3

5G Wireless Network Security: Investigating Next-Generation ...

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3rd IEEE International Conference on device Intelligence, Computing and Communication Technologies, dICCT 2025

作者： ravi, Kiran Chand Joseph, Arokia Suresh Kumar Bojjawar, Satish Pandi, V.Samuthira Thangasamy, Veeraiyah Jayanthi, S. Mlr Institute of Technology Department of ECE Dundigal Hyderabad India Kuka Us Holdings Company Llc 6600 Center Dr Sterling HeightsMI48312 United States Cvr College of Engineering Department of Electronics and Instrumentation Engineering Telangana Ranga Reddy India Chennai Institute of Technology Centre for Advanced Wireless Integrated Technology Tamil Nadu Chennai India V.S.B. Engineering College Department of Electronics and Communication Engineering Tamil Nadu Karur India R.M.D. Engineering College Department of ECE Tamil Nadu Chennai India

ISBN: (纸本)9798331543358

Unprecedented levels of speed, capacity, and connectivity for billions of devices are all on the horizon with the introduction of 5G wireless networks, which constitute a significant leap in mobile communication technology. These improvements, however, bring with them significant security concerns that need to be addressed in order to protect sensitive data and guarantee the privacy of users. This study analyzes the data encryption methods and authentication protocols that are specifically created for 5G networks, which are specifically designed for the next generation of mobile communication. To begin, we conduct an analysis of the inherent weaknesses that are present in the wireless communication systems that are now in use. This analysis drives home the point that robust encryption mechanisms are required to protect against unwanted access and data breaches. Elliptic Curve Cryptography (ECC), Quantum Key distribution (QKd), and homomorphic encryption are some of the advanced algorithms that are discussed in our research paper. A variety of encryption methods that are designed for 5G architecture are also discussed. As part of the 5G ecosystem, we evaluate how well they are able to protect the confidentiality, integrity, and authenticity of data while taking into account the limitations imposed by devices with limited resources. Further, we investigate novel authentication protocols, such as Mutual Authentication and Enhanced Authentication and Key Agreement (EAKA), which are designed to improve the level of security that is present during the interaction between the user and the network equipment. In order to evaluate the effectiveness, efficiency, and resilience of these encryption algorithms and authentication procedures in the face of growing threats in the 5G landscape, we conduct a series of simulations and comparative data analysis. Compared to earlier generations, the findings indicate a significant improvement in the security characteristics, and specific

关键词： Mobile security

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Experimental demonstration of multiparty reference-frame-independent QKd

Experimental demonstration of multiparty reference-frame-ind...

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Conference on Lasers and Electro-Optics (CLEO)

作者： donghwa Lee Kyujin Shin Yosep Kim Hyang-Tag Lim Yong-Su Kim Center for Quantum Information Korea Institute of Science and Technology (KIST) Seoul Republic of Korea Division of Nano & Information Technology KIST School Korea University of Science and Technology Seoul Republic of Korea Materials Research & Engineering Center R&D Division Hyundai Motor Company Uiwang Republic of Korea

We report that rFI-QKd protocol can be extended to multiparty system using Greenberger-Horne-Zeilinger (GHZ) state. We derive the asymptotic key rate and perform proof-of-principle experiment to verify the feasibility... 详细信息

ISBN: (纸本)9781957171258

关键词： Optical fibers Photonic entanglement Quantum communications Quantum key distribution Quantum networks Single photon detectors

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An On-Line Inductance Identification Method for Permanent Magnet Synchronous Motors Under Sensorless Control in The Full Speed domain

An On-Line Inductance Identification Method for Permanent Ma...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yue Liu Liguo Wang Qiang Gao Yong Li Fei E Department of Electrical Engineering Shanghai Jiao Tong University Shanghai China State Grid Suzhou Power Supply Company Substation Maintenance Center Suzhou China Department of R&D Contemporary Amperex Electric Vessel Technology Co. Limited Ningde China Department of Technology Contemporary Amperex Electric Vessel Technology Co. Limited Ningde China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

This work presents an online inductance identification method for permanent magnet synchronous motors in the full speed domain. Online inductance estimation is realized by injecting two modified high-frequency square wave voltage signals into the d-q axis simultaneously. This method can achieve high-precision identification of inductance in the full sensorless speed domain. The simulation results show that the inductance identification accuracy of this method can reach ±4% whether under constant loading, sudden addition and subtraction loading or dynamic loading.

关键词： Inductance Accuracy Simulation Loading Asia Estimation Sensorless control

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Pore-Scale Understandings for Steady-State Two-Phase Flow in Natural Porous Media from Pore Connectivity Quantification

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SSrN 2023年

作者： Qiao, Juncheng Zeng, Jianhui An, Ting Jiang, Shu Ma, Yong Liu, Yazhou Chen, dongxia Cai, Jianchao Zhang, Yongchao Feng, Xiao Cao, Zhe Sun, Chenhao State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing102249 China College of Geosciences China University of Petroleum Beijing102249 China Fengcheng Oilfield operation District Xinjiang Oilfield Company CNPC Karamay834000 China Energy & Geosciences Institute Department of Chemical Engineering University of Utah UT84108 United States Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education School of Earth Resources China University of Geosciences Wuhan430074 China The Key Laboratory of Gas Hydrate Ministry of Natural Resources Institute of Marine Geology Qingdao266071 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Sinopec Petroleum Exploration and Production Research Institute Beijing102206 China

Fluid and chemical transport in the connected pore system of various natural porous sandstone governs numerous energetic and industrial activities. A nanometer-millimeter pore connectivity quantification is compiled,on the basis of which steady-state two-phase flow physics are explored. Connectivity evaluation indicates that high permeable sandstone shares a reticular connection network with scale-invariant connected ratio stays at around 0.60, low-permeability sandstone exhibits branch-like pattern with the ratio ranging from 0.53 to 0.60, while tight sandstone is characterized by local chain-like pattern with an average ratio of 0.31. With decreasing connectivity degree, differed deviated linear and power-law flows present in the fractional non-wetting phase flow of steady-state two-phase flow. A coupled phase’s mobility, dynamic phase’s interactions, and dynamic non-wetting phase flow paths evaluations based on the connectivity quantification, incorporating dLVO theory, augmented Young-Laplace equation, and effective hydraulic radius model, explain the reasons for flow regime distinctions. It indicates that the full-range connected pore size distribution determines multiphase mobility potential and dynamic multiphase interaction force, which successively control the dynamic expansion of non-wetting phase pathway. differences in preferential non-wetting phase flow path expansions and accompanying non-wetting phase flow resistances in the connected pores © 2023, The Authors. All rights reserved.

关键词： Two phase flow

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Case study: Fault slip induced by hydraulic fracturing and risk assessment of casing deformation in the Sichuan Basin

Case study: Fault slip induced by hydraulic fracturing and r...

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SPE/AAPG/SEG Asia Pacific Unconventional resources technology Conference 2019, APUr 2019

作者： Chen, Zhaowei Fan, Yu Huang, rui Zeng, Bo Walsh, rall Zhou, Xiaojin Zoback, Mark Song, Yi CNPC Engineering Technology R and D Company Limited China Petro China Southwest Oil and Gas Field Company China CNPC Engineering Technology R and D Company Limited China University of Petroleum Beijing China Decision Geomechanics LLC Stanford University United States

ISBN: (纸本)9781613996737

Taking the X pad of shale gas in Sichuan Basin as the research object, we observe casing deformation, identify faults, establish a geomechanical model, and analyze the slip probability of faults. The correlational analysis between the positions of the casing deformation and ant tracking faults and microseismic events shows that the fault slip induced by hydraulic fracturing might be the cause of casing deformation. Based on the geological structure of the block, a total of 30 faults are interpreted. The faults were identified mainly by ant tracking and microseismic data. Conventional logs, image logs and mini-fracturing data were analyzed to establish the geomechanical model. The Mohr-Coulomb criterion was used to analyze the activation states of these faults, and the Quantitative risk Analysis (QrA) method was used to analyze the risk of fault slip and sensitivity of fault slip to each factor. The results show that most of the faults in this block are in a critical stress state under the in-situ conditions, and the well-oriented faults can easily be activated under current pumping pressure. After a pressure increase of 2500 PSI, the lowest slip probability of the faults intersecting the casing deformation section reaches 65%, which shows that the casing deformation can be caused by fault slip. Sensitivity analysis shows that the results are most sensitive to pore pressure and friction. Based on the risk assessment, the chance of fault slip can be calculated, which provides a reference for guiding drilling design. Hence method may provide an effective method for mitigating casing deformation problems. © 2019, Unconventional resources technology Conference (UrTeC).

关键词： Fault slips

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A Virtual Screening Framework Based on the Binding Site Selectivity for Small Molecule drug discovery

SSRN

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SSrN 2024年

作者： Che, Xinhao Liu, Qilei Yu, Fang Zhang, Lei Gani, rafiqul Frontier Science Center for Smart Materials Oriented Chemical Engineering Institute of Chemical Process Systems Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China PSE for SPEED Company Ordrup Jagtvej 42D CharlottenlundDK-2920 Denmark Guangzhou China Department of Applied Sustainability Széchenyi István University Győr Hungary

In this work, a systematic and computer-aided virtual screening framework based on the binding site selectivity to screen candidate drug molecules in terms of their ability to bind on selected sites is presented. The framework integrates two machine learning (ML)-based models to predict the binding potential and binding selectivity to specific binding sites that are important for virtual screening of drug molecules. The details of the ML-based models together with the work-flow of the computer-aided virtual screening method and the efficient and consistent integration of related drug design tools are presented. The applicability of this virtual screening framework is illustrated through a case study involving the screening for drug molecules as inhibitors to block the binding of severe acute respiratory syndrome coronavirus 2 (SArS-CoV-2) to angiotensin converting enzyme 2 (ACE2), which is the target protein. © 2024, The Authors. All rights reserved.

关键词： Binding sites

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Corrigendum to “Steam reforming of ethylene over manganese-chromium spinel oxides” [J. Catal. 380 (2019) 224–235]

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Journal of Catalysis 2022年 405卷 656-657页

作者： Lu Yang Maxim P. Bukhovko Gordon Brezicki Andrzej Malek Liwei Li Christopher W. Jones Pradeep K. Agrawal robert J. davis Department of Chemical Engineering University of Virginia Charlottesville VA 22904 USA School of Chemical & Biomolecular Engineering Georgia Institute of Technology Atlanta GA 30332 USA Hydrocarbons R&D The Dow Chemical Company 1776 Building Midland MI 48674 USA Hydrocarbons R&D The Dow Chemical Company Freeport TX 77541 USA Department of Chemical Engineering Michigan Technological University Houghton MI 49931 USA

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