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Optimum design of downhole chokes with high sulfur content and large pressure difference

IOP Conference Series: Earth and Environmental Science 2020年第1期461卷

作者： Ma Huiyun Jiang Yuan Yin Qiang Zhang Fangfang Chen Shaowei Lv Yanxin Lei Guoping Engineering Technology Research Institute PetroChina Southwest Oil & Gas Field Company Chengdu Sichuan 610017 China National Energy R&D Center of High Sulfur Gas Exploitation Chengdu Sichuan 610017 China CNPC Chuanqing Drilling Engineering Company Limited Guanghan Sichuan 618300 China School of Mechatronic Engineering Southwest Petroleum University Chengdu Sichuan 610500 China

Natural gas resources are abundant in southwest China, but the exploitation environment with high pressure and sulfur always affects the working performance of downhole chokes, which in turn restricts the output of natural gas. In this paper, a high sulfur resistance fixed downhole choke is designed for high temperature (120°C), high production rate and high pressure difference (105MPa) sand-producing Wells. Through the nozzle discharge model to simulate the flow of the fluid through the nozzle, with Bono Maleev method to predict the hydrate formation conditions of downhole choke for the design of the structure. According to the failure forms of different parts, the materials were optimized, and the high sulfur resistant 3YC51 alloy, hard alloy and wear and corrosion resistant sulfur resistant rubber were selected through the test to improve the service life of the choke in the high sulfur high-pressure gas well and ensure the reliability of the tool. The results of numerical analysis on the tool holder and the pressure test of the Laboratory seal show that the choke designed has a good sealing and pressurization performance in the high temperature and high pressure difference environment of 120°C and 105MPa, and it can realize the function of lowering the pressure at the bottom of the well under this working condition, meeting the feasibility requirements. Through this design, the design and improvement of high sulfur gas well tool and new choke has guiding significance.

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Efficient dynamic evolution of service composition

Efficient dynamic evolution of service composition

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作者： Lv, Chen Jiang, Wei Hu, Songlin Wang, Jiye Lu, Guoliang Liu, Zhiyong School of Information Science and Engineering Shandong Normal University China Greatwall Drilling Company R&D Academy of Well Logging CNPC Beijing China Institute of Information Engineering Chinese Academy of Sciences Beijing China Department of Information Technology State Grid Corporation of China Beijing China School of Mechanical Engineering Shandong University China Institute of Computing Technology Chinese Academy of Sciences Beijing China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China

Current QoS-aware automatic service composition queries over a network of web services are often one-time in nature. After a network of web services is built, such queries are issued once, and answers are found from the scratch. The underlying assumption is that the participating web services are rather static, which means that their functional and non-functional parameters seldom change. However, such an assumption is often baseless. New services come and go, service APIs change gradually, and QoS values fluctuate in practice. Therefore, a support for efficiently adapting service composition is desired. In this paper, we propose an event driven continuous query algorithm to intelligently cope with different types of dynamic services, and thus enable evolution of service composition. Evaluation using both real QoS data and synthetic web service data shows its superior performance, compared with the state-of-the-art solution which won the performance championship of Web Service Challenge in 2009 and 2010. Moreover, we generalize a new graph problem: dynamic single-source optimal-directed Acyclic Graphs (dAG) problem based on the above work. It is argued that API recommendation for framework evolution, as another typical application, could also be modeled and addressed efficiently using the proposed new graph approach. © 2017 IEEE.

关键词： Web services

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Importance of Smart Meters data Processing – Case of Saudi Arabia

Importance of Smart Meters Data Processing – Case of Saudi ...

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International Conference on Electrical and Computing Technologies and Applications (ICECTA)

作者： Thamer Alquthami Abdullah M. Alsubaie Murad Anwer Department of Electrical and Computer Engineering King Abdulaziz University Jeddah Saudi Arabia Energy Research Institute King Abdulaziz City of Science and Technology Riyadh Saudi Arabia R&D Distribution Department Saudi Electricity Company Riyadh Saudi Arabia

This paper presents a thorough analysis of 30-minute data sets of KSA residential digital meters to identify all possible discrepancies in the data sets and devise statistical techniques best suited to remove these discrepancies as per the nature of each discrepancy. The analysis is performed through a program that was developed in Python-Pandas. The program parses through three month's meter measurements of 3,283 consumers throughout KSA and detects data inconsistencies, duplicates, missing and outlier values and other issues in the data sets. Statistical techniques that are part of the program are then implemented to correct for these issues. A validation process was developed and included in the program to ensure the adjustment process produces the best reliable outcomes. Analysis indicates that smart meters data have issues that need preprocessing to be used for other applications. The outcome of the program developed shows that smart meters measurement outcome data set could be considered as a valid and trusted, which can be used for smart grid applications such as behavioral analysis of the electricity consumers.

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Effect of heat treatment on strain–controlled fatigue behavior of cast Mg–Nd–Zn–Zr alloy

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Journal of Materials Science & technology 2018年第11期34卷 2091-2099页

作者： Zhenming Li Qigui Wang Alan A.Luo Jichun dai Hui Zou Liming Peng Institute of Sci-technology Strategy JiangXi Academy of SciencesNanchang 330096China General Motors Company Global Propulsion SystemPontiacMI48340USA The Ohio State University ColumbusOH 43210USA Research Institute(R&D Center) Shanghai JuneBang Technology CorporationShanghai 200032China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

The influence of heat treatment on the strain-controlled fatigue behavior of cast NZ30 K alloy was investigated. Compared with the as-cast and solutionized（T4） alloys, the peak-aged（T6） and over-aged（T7）counterparts have a higher cyclic stress and a lower plastic strain value due to the precipitation strengthening. The as-cast and T4-treated alloys have a higher fatigue strength/yield strength ratio than the aged alloys, which is mainly attributed to their higher cyclic hardening. Under stress-controlled loading,the aged alloys show lower hysteresis energies than the as-cast and T4-treated counterparts, leading to longer fatigue lifetimes. For the T4-treated alloy, the cyclic hardening and fatigue failure are controlled by the dislocations-slip and twinning, while for both the as-cast and T6-treated counterparts, they are controlled by the dislocation-slip. For the T7-treated alloy, cyclic deformation and failure behavior are mainly dependent on dislocations-slip and grain boundary sliding.

关键词： Magnesium alloys Heat treatment Strain-controlled fatigue characteristics Hysteresis energies Cyclic deformation

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GPU-Accelerated Algorithm for On-line Probabilistic Power Flow

GPU-Accelerated Algorithm for On-line Probabilistic Power Fl...

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IEEE General Meeting Power& Energy Society

作者： Gan Zhou rui Bo Lungsheng Chien Xu Zhang Shengchun Yang dawei Su Electrical Engineering Southeast University China Electrical and Computer Engineering Missouri University of Science and Technology R&D NVIDIA R&D China Electric Power Research Institute R&D State Grid Jiangsu Electric Power Company

ISBN: (纸本)9781538677049;9781538677032

This letter proposes a superior GPU-accelerated algorithm for probabilistic power flow (PPF) based on Monte-Carlo simulation with simple random sampling (MCS-SrS). By means of offloading the tremendous computational burden to GPU, the algorithm can solve PPF in an extremely fast manner, two orders of magnitude faster in comparison to its CPU-based counterpart. Case studies on three large-scale systems show that the proposed algorithm can solve a whole PPF analysis with 10000 SrS and ultra-high-dimensional dependent uncertainty sources in seconds and therefore presents a highly promising solution for online PPF applications.

关键词： Probabilistic logic Load flow Gallium nitride Companies Computational modeling Graphics processing units

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Study on the multicomponent collaborative sealing mechanism of shale formations

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IOP Conference Series: Earth and Environmental Science 2019年第5期227卷

作者： Cha Ma Long Li Guojun Liu Zhiliang Zhao Jie Zhang Hongxuan Wu Jiangxi Science & Technology Normal University Nanchang 330013 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China China National Oil and Gas Exploration and Development Company Ltd Beijing 100034 China CNPC Chuanqing Drilling Engineering Company Limited Chengdu 610051 China.

due to strong inhibitive ability, oil-based drilling fluid system was often the first choice of drilling fluids in the drilling operation of shale plays. However, borehole instability problems tend to occur most frequently in the drilling operation of horizontal well intervals. So the sealing mechanism of shale formation was of great importance to wellbore stability. Sealing effect of colloid particles, bridging and blocking effect of skeleton particles, plugging function of deformable particles and isolation effect of polymer were analysed, and multicomponent collaborative plugging mechanism was investigated. The results indicated that it could play an important role in plugging micropores and microfractures on shale surface to form a blocking layer with ultra-low permeability. This study can be helpful for the design of novel plugging agents for drilling fluids, and endow with economically and technically viable petroleum development and production.

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Effect of Hydrophilic Nano-SiO2 on CH4 Hydrate Formation: Insight from the Experimental Study

Effect of Hydrophilic Nano-SiO2 on CH4 Hydrate Formation: In...

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Wang ren Sun Huicui Wang Jianhua Zhang Jie Jiang Guosheng Ning Fulong CNPC Engineering Technology R & D Company limited National Engineering Laboratory for Oil&Gas Drilli China University of Geosciences National Engineering Laboratory for Oil&Gas Drilling Technology

Invasion of drilling fluid into natural gas hydrate deposits during drilling might damage the reservoir,induce hydrate dissociation and then cause wellbore instability and distortion of the data from well *** nanoparticles into drilling fluid is an effective method in reducing the invasion of drilling fluid and enhancing bore-hole ***,the addition of nanoparticles might also introduce hydrate formation risk in borehole because they can act as the "seeds" for hydrate *** paper presents an experimental study of the effect of hydrophilic silica nanoparticle on gas hydrate formation in a dynamic methane/liquid-water *** the experiment,the ul-trapure water with and without 1.0~6.0wt% concentrations of silica nanoparticles,grain sizes of 20nm and 50nm,were pressurized by methane gas under varied conditions of tem-perature and *** induction time,the gas consumption,and the average rate of gas consumption in the system were measured and compared to those in ultrapure *** results show that a concentration of 4.0wt% hydrophilic SiO2 particles with a grain size of 50 nm has a relatively strong inhibition effect on hydrate formation when the initial experimental condition is 5.0℃ and *** to ultrapure water,the hydrophilic nano-SiO2fluid increases the induction time for hydrate formation by 194% and decreases the amount and average rate of hydrate formation by 10% and 17%,*** inhibition effect may be attributed to the hydrophilicity,amount and ag-gregation of silica nanoparticle according to the results of water activity and zeta potential *** work also elucidates hydrophilic,instead of hydrophobic,nanoparticles can be added to the drilling fluid to maintain wellbore stability and to protect the hydrate reservoir from drilling mud damage,because they exhibit certain degree of hy-drate inhibition which can reduce the risk of hydrate reformation and aggregation during gas hydrate or

关键词： Hydrate drilling fluid Hydrophilic nano-SiO2,Concentration,Grain size,Hydrate formation,Inhibition mechanism

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Synthesis and study of polystyrene/montmorillonite nanocomposite emulsion drilling fluid lubricant

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IOP Conference Series: Earth and Environmental Science 2019年第1期384卷

作者： Zhengrong Zhang Huiting Liu Yongjin Yu Yangchuan Ke Chengcheng Yu CNPC Engineering Technology R&D Company Limited Building 1 yard 5 huanghe street changping district Beijing China CNPC Nanochemistry Key Laboratory College of Science China University of Petroleum Beijing 102249 China

Conventional drilling fluid lubricants could effectively improve the lubricity of the system, but the temperature and salt resistance was poor. In this paper, a new type of emulsion drilling fluid lubricant was prepared by mixing a polystyrene/modified montmorillonite (MMT) nanocomposite emulsion with vegetable base oil. The nanocomposite emulsion was prepared by emulsion polymerization of organic MMT, modified with the tributyltetradecylphosphonium chloride and sodium lauryl sulfonate, and styrene. The work revealed effects of the amount of modified MMT and lubricant on the performance of the drilling fluid. It was shown that lubricants have less effect on the rheology and density changes of the drilling fluid. The lubricity, temperature resistance and salt resistance of the drilling fluid were enhanced, while the fluid loss was significantly reduced due to the addition of the lubricant. Our results provide the basic method needed to guide design of the lubricant.

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High Throughput Grain Mapping with Sub-Nanometer resolution by 4d-STEM

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Microscopy and Microanalysis 2019年第S2期25卷 1960-1961页

作者： Frances I. Allen Thomas C. Pekin Arun Persaud Steven J. rozeveld Gregory F. Meyers Jim Ciston Colin Ophus Andrew M. Minor Department of Materials Science and Engineering UC Berkeley Berkeley CA USA. National Center for Electron Microscopy Molecular Foundry LBNL Berkeley CA USA. Accelerator Technology and Applied Physics Division LBNL Berkeley CA USA. Core R&D – Analytical Sciences The Dow Chemical Company Midland MI USA.

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Effect of the combination of hydrophilic nano-SiO2 and gaffix VC-713 polymer on CH4 hydrate formation: Insight from the experimental study

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IOP Conference Series: Materials Science and engineering 2019年第1期634卷

作者： r Wang X G Xu X M Shi Y Y Li J Zhang Z Yang CNPC Engineering Technology R & D Company Limited Beijing 102206 China National Engineering Laboratory for Oil & Gas Drilling Technology Beijing 102206 China

In this paper, the effect of the combination of hydrophilic nano-SiO2 with a particle size of 80 nm and gaffix VC-713 polymer (VC-713) on their hydrate inhibition was investigated at 4.0°C and 6.0 MPa, and the underlying influence mechanism was analysed by a multiple scales of the meso-structural observation experiments. Experimental results indicated that the combination doesn't exhibit any synergistic inhibition effect on the formation of CH4 hydrate, but it weakens the hydrate inhibition abilities of both components. Moreover, with the increase of the VC-713 content to 0.75 wt% and 1.00 wt%, the inhibition of hydrophilic nano-SiO2 completely disappears.

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