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Science China(Technological Sciences) 2023年第10期66卷 2837-2849页

作者： HE JianYu XIE Fei ZHAO Yang GUO DaCheng WANG Dan LI JunChi College of petroleum Engineering Liaoning Petrochemical UniversityFushun 113001China Key Laboratory of Oil and Gas storage and transportation Technology in Liaoning Province Fushun 113001China Liaohe Oilfield Oil and Gas Gathering and Transmission Company Panjin 124000China Northeast Natural Gas Sales Center Sinopec Natural Gas BranchShenyang 110100China

Electrochemical experiments,slow strain rate tensile testing(SSRT),and scanning electron microscopy were used to investigate the effect of various applied potentials on the stress corrosion cracking(SCC)of X80 pipeline steel in acidic soil containing sulfate-reducing bacteria(SRB).The results demonstrated that when the anodic potential was applied,X80 steel exhibited sensitivity to SCC,which was attributed to anodic *** SCC sensitivity initially decreased,but then increased with a negative shift in the applied ***-1200 mV,SCC was the most sensitive,which corresponded to the substantial cathodic polarisation and toxic impact of SRB,which increased the risk of hydrogen ***-850 mV,the SCC sensitivity was the lowest because cathodic polarisation suppressed anodic *** experimental results can contribute to the prevention and management of SCC in operational pipelines.

关键词： applied potential acid soil SCC sulfate-reducing bacteria

Wax deposition modeling in oil-water stratified pipe flow

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petroleum Science 2023年第1期20卷 526-539页

作者： Hui-Shu Liu Ji-Miao Duan Jiang Li Jian Wang Hao Yan Ke-Yu Lin Ke-Cheng Gu Chang-Jun Li petroleum Engineering School Southwest Petroleum UniversityChengdu610500China petroleum Oil and Lubricants DepartmentArmy Logistics AcademyChongqing401311China

Wax deposition in oil-water stratified flow is commonly encountered onshore and offshore oil production pipe systems,and typically reduces transportation capacity of *** accurate predicted model of wax deposition has becomes an indispensable approach to design effective remediation ***,a reliable mechanistic model for wax deposition prediction in oil-water two-phase stratified pipe flow is lacking to validate the deposition *** this work,a three-dimensional(axial,radial,and angular)robust wax deposit model for oil-water stratified circular pipe flow was *** model of formation of a gel deposit based on the first principles of rheology was developed,associated with the results obtained from hydrodynamics and heat/mass transfer *** predictions for wax deposition are found to compare satisfactorily with experimental data with two different oils for single phase and four different water cuts for oil-water stratified pipe *** can be seen from the wax gelation mechanism that an increase in water cut can help to reduce the wall/oil-deposit interface shear stress,thereby leading to an increase in the degree of gelation as well as the deposit ***,a local deposit analysis in the circumferential direction was conducted,for water cut 75%and total flow rate 5 m3/h,which provided insights to understand that the thickness on pipe wall was roughly uniformly distributed locates near the top of the pipe and the nearer the position gets close to two points,where the oil-water interface contacts the inner wall,the deposition thickness quickly dropped to *** was attributed to the fact that a roughly uniformly thickness far away from the oil-water interface contact the inner wall resulted in the slowly changes temperature along the circumferential pipe wall wetted by oil.

关键词： Wax deposition Oil-water flow Stratified flow Heat and mass transfer

Investigation on synergistic deposition of wax and hydrates in waxy water-in-oil(W/O) flow systems

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petroleum Science 2022年第4期19卷 1840-1852页

作者： Yang Liu Xiao-Fang Lv Qian-Li Ma Shi-Dong Zhou Bo-Hui Shi Hui Du Yun Lei Peng-Fei Yu Shang-Fei Song Jing Gong Bing-Cai Sun Jiangsu Key Laboratory of Oil and Gas storage and transportation Technology Changzhou UniversityChangzhouJiangsu213164China Institute of petroleum Engineering Technology Sinopec Northwest Oil Field CompanyUrumqiXinjiang830011China National Engineering Laboratory for Pipeline Safety/State Key Laboratory of Natural Gas Hydrate China University of Petroleum-BeijingBeijing102249China CNPC Safety and Environmental Protection Technology Research Institute Co.Ltd Beijing102206China

Elucidating the synergistic effect of wax and hydrates, involving formation, aggregation and deposition,is imperative to the operation and transportation safety for offshore petroleum fields. To understand the characteristics and mechanism of synergistic deposition of wax and hydrates, flow and deposition experiments of systems with different wax contents(0-2.89 wt%), initial flow rates, pressures and temperatures were conducted in a high pressure visual flow loop. According to the flow rate and pressure drop data as well as the visual window observation, four different types of plugging scenarios of waxhydrate coexisting systems with different flow properties and wall deposition state were summarized,including rapid plugging, transition plugging, gradual plugging type I and gradual plugging type *** with the wax-free system after hydrate formation, even with the addition of anti-agglomerant(AA) with the same concentration, wax-hydrate coexisting systems could not reach stable hydrate slurry flow state, indicating that the existence of wax deteriorated the performance of AA. Aside from the influence of wax crystals on hydrate agglomeration, it was found that wax deposition layer would alter the adhesion and bedding of hydrates, resulting in the variation of flow properties and wall deposition *** low wax content systems(0.75 wt%) where rapid plugging occurred, the synergistic effect between wax and hydrates promoted the formation of wax-hydrate coupling aggregates, resulting in severe local deposition when the coupling aggregates attained critical deposition size and consequently decreasing flow rate, forming a vicious circle of decreasing transportability. Since bedding of coupling aggregates was hindered by the uniformly coated wax deposition layer on pipe wall, gradual plugging rather than rapid plugging occurred in medium wax content systems(1-1.25 wt%), predominately caused by the gradual increment in viscosity of waxy hydrate slurry. For relative

关键词： Flow assurance Wax Hydrates Flow properties Synergistic deposition

Storing Freshwater Versus Storing Electricity in Power Systems with High Freshwater Electric Demand

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 323-333页

作者： Mubarak J.Al-Mubarak Antonio J.Conejo department of Electrical and Computer Engineering The Ohio State UniversityColumbusOHUSA department of Electrical Engineering Kuwait UniversityP.O.Box 5969Safat 13060Kuwait department of Integrated Systems Engineering and the department of Electrical and Computer Engineering The Ohio State UniversityColumbusOH 43210USA IEEE

We consider a power system whose electric demand pertaining to freshwater production is high(high freshwater electric demand),as in the Middle East,and investigate the tradeoff of storing freshwater in tanks versus storing electricity in batteries at the day-ahead operation *** storing freshwater and storing electricity increase the actual electric demand at valley hours and decrease it at peak hours,which is generally beneficial in term of cost and ***,to what extent?We analyze this question considering three power systems with different generation-mix configurations,i.e.,a thermal-dominated mix,a renewable-dominated one,and a fully renewable *** generation-mix configurations are inspired by how power systems may evolve in different countries in the Middle *** production uncertainty is compactly modeled using chance *** draw conclusions on how both storage facilities(freshwater and electricity)complement each other to render an optimal operation of the power system.

关键词： Power system operation freshwater production and transportation coordination day-ahead scheduling

Thermal Stability of Supercapacitor for Hybrid Energy storage System in Lightweight Electric Vehicles:Simulation and Experiments

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 170-178页

作者： Vima Mali Brijesh Tripathi department of Electrical Engineering/Solar Energy Pandit Deendayal Petroleum UniversityGandhinagarIndia department of Science Pandit Deendayal Petroleum UniversityGandhinagarIndia

Recent research findings indicate that the non-monotonic consumption of energy from lithium-ion(Li-ion)batteries results in a higher heat generation in electrical energy storage *** peak demands,a higher heat generation due to high discharging current increases the temperature from 80℃ to 120℃,thereby resulting in thermal *** address peak demands,an additional electrical energy storage component,namely supercapacitor(SC),is being investigated by various research *** paper provides insights into the capability of SCs in lightweight electric vehicles(EVs)to address peak demands using the worldwide harmonized light-duty driving test cycle(WLTC)driving profile in MATLAB/Simulink at different ambient *** results indicate that temperature imposes a more prominent effect on Li-ion batteries compared with SCs under peak demand *** effect of the discharging rate limit on the Li-ion battery current is *** result shows that SCs can accommodate the peak demands for a low discharging current limit on the battery,thereby reducing heat *** impedance spectroscopy and cyclic voltammetry are performed on SCs to analyze their thermal performance at different temperatures ranging from 0℃ to 75℃ under different bias values of-0.6,0,0.6,and 1 V,*** results indicate a higher specific capacitance of the SC at an optimum operation temperature of 25℃ for the studied *** study shows that the hybrid combination of the Li-ion battery and SC for a lightweight EV can address peak demands by reducing thermal stress on the Li-ion battery and increasing the driving range.

关键词： Electric vehicle lithium-ion battery supercapacitor thermal stability

Energy-Efficient UAVs Coverage Path Planning Approach

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 3239-3263页

作者： Gamil Ahmed Tarek Sheltami Ashraf Mahmoud Ansar Yasar Computer Engineering department Interdisciplinary Research Center of Smart Mobility and LogisticsKing Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia transportation Research Institute(IMOB) Hasselt UniversityHasselt3500Belgium

Unmanned aerial vehicles(UAVs),commonly known as drones,have drawn significant consideration thanks to their agility,mobility,and flexibility *** play a crucial role in modern reconnaissance,inspection,intelligence,and surveillance *** path planning(CPP)which is one of the crucial aspects that determines an intelligent system’s quality seeks an optimal trajectory to fully cover the region of interest(ROI).However,the flight time of the UAV is limited due to a battery limitation and may not cover the whole region,especially in large ***,energy consumption is one of the most challenging issues that need to be *** this paper,we propose an energy-efficient coverage path planning algorithm to solve the CPP *** objective is to generate a collision-free coverage path that minimizes the overall energy consumption and guarantees covering the whole *** do so,the flight path is optimized and the number of turns is reduced to minimize the energy *** proposed approach first decomposes the ROI into a set of cells depending on a UAV camera ***,the coverage path planning problem is formulated,where the exact solution is determined using the CPLEX *** small-scale problems,the CPLEX shows a better solution in a reasonable ***,the CPLEX solver fails to generate the solution within a reasonable time for large-scale ***,to solve the model for large-scale problems,simulated annealing forCPP is *** results show that heuristic approaches yield a better solution for large-scale problems within amuch shorter execution time than the CPLEX ***,we compare the simulated annealing against the greedy *** results show that simulated annealing outperforms the greedy algorithm in generating better solution quality.

关键词： Coverage path planning MILP CPLEX solver energy model optimization region of interest area of interest

Green tribology:Fundamentals and future development

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Friction 2013年第2期1卷 186-194页

作者： Si-wei ZHANG School of Mechanical and storage and transportation Engineering China University of Petroleum20 Xueyuan RdPO Box 902Beijing 100083China

As green tribology is a new field of tribology still in its infancy,understanding its fundamentals is essential for its further *** this article,a brief historical retrospective on the emergence of green tribology is introduced first,and then the definition,objectives,and disciplinary features of green tribology are *** particular,the technological connotations of green tribology are expounded ***,the developing directions of this new area are *** findings may contribute to laying the foundation of further advancement in green tribology.

关键词： green tribology technological connotations environmental impact biological impact developing directions

Casing life prediction using Borda and support vector machine methods

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petroleum Science 2010年第3期7卷 416-421页

作者： Xu Zhiqian Yan Xiangzhen Yang Xiujuan College of Mechanical and Electronic Engineering China University of Petroleum Dongying Shandong 257061 China College of storage ＆ transportation and Architectural Engineering China University of Petroleum Dongying Shandong 257061 China

Eight casing failure modes and 32 risk factors in oil and gas wells are given in this paper. According to the quantitative analysis of the influence degree and occurrence probability of risk factors, the Borda counts for failure modes are obtained with the Borda method. The risk indexes of failure modes are derived from the Borda matrix. Based on the support vector machine （SVM）, a casing life prediction model is established. In the prediction model, eight risk indexes are defined as input vectors and casing life is defined as the output vector. The ideal model parameters are determined with the training set from 19 wells with casing failure. The casing life prediction software is developed with the SVM model as a predictor. The residual life of 60 wells with casing failure is predicted with the software, and then compared with the actual casing life. The comparison results show that the casing life prediction software with the SVM model has high accuracy.

关键词： Support vector machine method Borda method life prediction model failure modes riskfactors

A liquid loading prediction method of gas pipeline based on machine learning

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petroleum Science 2022年第6期19卷 3004-3015页

作者： Bing-Yuan Hong Sheng-Nan Liu Xiao-Ping Li Di Fan Shuai-Peng Ji Si-Hang Chen Cui-Cui Li Jing Gong National-Local Joint Engineering Laboratory of Harbor Oil&Gas storage and transportation Technology/Zhejiang Provincial Key Laboratory of Petrochemical Pollution Control School of Petrochemical Engineering and EnvironmentZhejiang Ocean UniversityZhoushan316022China National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum-BeijingBeijing102249China China Huadian Group Energy Co. Ltd.North China BranchTianjin300280China China petroleum Engineering&Construction Corp Beijing100120China

The liquid loading is one of the most frequently encountered phenomena in the transportation of gas pipeline,reducing the transmission efficiency and threatening the flow ***,most of the traditional mechanism models are semi-empirical models,and have to be resolved under different working conditions with complex calculation *** development of big data technology and artificial intelligence provides the possibility to establish data-driven *** paper aims to establish a liquid loading prediction model for natural gas pipeline with high generalization ability based on machine ***,according to the characteristics of actual gas pipeline,a variety of reasonable combinations of working conditions such as different gas velocity,pipe diameters,water contents and outlet pressures were set,and multiple undulating pipeline topography with different elevation differences was *** a large number of simulations were performed by simulator OLGA to obtain the data required for machine *** data preprocessing,six supervised learning algorithms,including support vector machine(SVM),decision tree(DT),random forest(RF),artificial neural network(ANN),plain Bayesian classification(NBC),and K nearest neighbor algorithm(KNN),were compared to evaluate the performance of liquid loading ***,the RF and KNN with better performance were selected for parameter tuning and then used to the actual pipeline for liquid loading location *** with OLGA simulation,the established data-driven model not only improves calculation efficiency and reduces workload,but also can provide technical support for gas pipeline flow assurance.

关键词： Liquid loading Data-driven method Machine learning Gas pipeline Multiphase flow

Title Supersonic Condensation and Separation Characteristics of CO_(2)-Rich Natural Gas under Different Pressures

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Energy Engineering 2023年第2期120卷 529-540页

作者： Yong Zheng Lei Zhao YujiangWang Feng Chang Weijia Dong Xinying Liu Yunfei Li Xiaohan Zhang Ziyuan Zhao Engineering Management Center Sinopec Shengli Oilfield CompanyDongying257000China Technical Inspection Center Sinopec Shengli Oilfield CompanyDongying257000China Shandong Provincial Key Laboratory of Oil&Gas storage and transportation Safety College of Pipeline and Civil EngineeringChina University of PetroleumQingdao266580China

Supersonic separation technology is a new natural gas sweetening method for the treatment of natural gas with high CO_(2)(carbon dioxide)*** structures of the Laval nozzle and the supersonic separator were designed,and the mathematical models of supersonic condensation and swirling separation for CO_(2)-CH4 mixture gas were *** supersonic condensation characteristics of CO_(2) in natural gas and the separation characteristics of condensed droplets under different inlet pressures were *** results show that higher inlet pressure results in a larger droplet radius and higher liquid phase mass fraction;additionally,the influence of centrifugal force is more pronounced,and the separation efficiency and removal efficiency of CO_(2) are *** the inlet pressure is 6 and 9 MPa,the liquefaction efficiency at the Laval nozzle outlet increases from 56.90%to 79.97%,and the outlet droplet radius increases from 0.39 to 0.72μm,and the removal efficiency is 31.25%and 54.52%,*** effects of inlet pressures on the removal efficiency of the supersonic separator are complicated and are controlled by the combined effects of liquefaction capacity of the nozzle and centrifugal separation capacity of the swirl vane.

关键词： Supersonic separator Laval nozzle natural gas carbon dioxide condensation separation