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CO_(2)-O_(2)-H_(2)O环境下油套管腐蚀研究进展

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全面腐蚀控制 2024年第2期38卷 109-113,121页

作者：张雅妮王思敏樊冰西安石油大学材料科学与工程学院陕西西安710065

在注空气驱采油过程中,采出液中通常存在酸性气体及腐蚀性离子,这些气体和离子的浓度变化,在温度和压力的作用下影响油套管的腐蚀行为,造成不同程度的腐蚀及损失。本文从腐蚀机制、影响因素和防腐措施方面展开CO_(2)-O_(2)-H_(2)O环境... 详细信息

在注空气驱采油过程中,采出液中通常存在酸性气体及腐蚀性离子,这些气体和离子的浓度变化,在温度和压力的作用下影响油套管的腐蚀行为,造成不同程度的腐蚀及损失。本文从腐蚀机制、影响因素和防腐措施方面展开CO_(2)-O_(2)-H_(2)O环境下油套管腐蚀行为的论述,简要介绍了不同因素下的腐蚀规律及主要影响因素,包括温度、气体分压和腐蚀介质。分析评价了两种常见的防腐手段,包括耐蚀材料的选择、表面镀层保护技术,为后续油套管的防腐提供理论依据。

关键词： CO_(2)/O_(2)腐蚀腐蚀机制影响因素腐蚀防护

Study on the effect of CH_(4) dissolution on the microstructure of wax crystal in waxy crude oil

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Petroleum Science 2022年第4期19卷 1853-1865页

作者： bing-fan Li Man-Ping Yang Gang Liu Li-Ming Zheng Chao Yang School of Vehicles and Energy Yanshan UniversityQinhuangdao066004HebeiChina University of Petroleum(East China) Shandong Provincial Key Laboratory of Oil&GasStorage and Transportation SafetyQingdao266580ShandongChina Technology Inspection Center of Shengli Oilfield SINOPECDongying257000China

In this work, the influence of the dissolution of methane(CH_(4)) gas on the wax crystal of waxy crude oil and the effect on the rheology of crude oil by dissolved CH_(4) were studied comprehensively. A self-deign high-pressure micro visualization device was developed to analyze wax crystals before and after gas dissolution. The crude oil from Shengli and Nanyang was tested by the device under various gas pressures. Results showed that the viscosity, maximum shear stress and equilibrium shear stress of Shengli crude oil decreased with the increasing pressure of the dissolved CH_(4). Due to the supersaturation of dissolved gas, the viscosity, maximum shear stress and equilibrium shear stress of Nanyang crude oil decreased initially and increased with the increasing pressure of dissolved CH_(4). The change in rheology of the dissolved gas crude oil can be a combined influence of gas pressure and dissolution mechanisms caused by CH_(4). Additionally, the wax precipitation point of Shengli crude oil decreased at the saturated dissolution of CH_(4), while Nanyang crude oil showed an increasing wax precipitation ***, the wax precipitation area, number of wax particles, and average diameter of wax crystal in both crude oils gradually decreased with dissolution. However, a saturation of CH_(4) caused a small amount of precipitation of wax crystals in Nanyang crude oil, and the small wax crystals were aggregated to form the large wax crystals. The dissolution of CH_(4) gas can affect the wax crystallization process, crystallization ability, and morphology of wax crystals that resulted in significant variation in the rheology of crude oil.

关键词： Waxy crude oil CH_(4)dissolution Wax crystal Rheology Mechanism

Recent Progress of Mussel-Inspired Underwater Adhesives

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Chinese Journal of Chemistry 2017年第6期35卷 811-820页

作者： Ke Zhang Feilong Zhang Yongyang Song Jun-bing fan Shutao Wang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science CAS Center for Excellence in Nanoscience Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou Henan 450001 China

Underwater adhesion is greatly desired in tissue transplantation, medical treatment, ocean transportation, and so on. However, common commercial polymeric adhesives are rather weakened and easily destroyed in water envi- ronment. In nature, some marine organisms, such as mussels, barnacles, or tube worms, exhibiting excellent under- water adhesion up to robust bonding on the rock of sea floor, can give exciting solutions to address the problem. Among these marine organisms, mussels exhibit unique underwater adhesion via the foot proteins of byssus. It has been verified that the catechol groups from the side chain of the mussel foot proteins is the main contribution to the unique underwater adhesion. Hence, inspired by the mussels＇ underwater adhesion, many mussel-mimetic polymers with catechol as end chains or side chains have been developed in the past decades. Here, we review recent progress of mussel-inspired underwater adhesives polymers from their catechol-functional design to their potential applica- tions in intermediates, anti-biofouling, self-healing of hydrogels, biological adhesives, and drug delivery. The re- view may provide basis and help for the development of the commercial underwater adhesives.

关键词： underwater adhesives mussel-inspired catechol polymeric adhesives

Wavelength-sensitive photocatalytic H2 evolution from H2S splitting over g-C3N4 with S,N-codoped carbon dots as the photosensitizer

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Journal of Energy Chemistry 2021年第1期30卷 234-242,I0008页

作者： Zhanghui Xie Shan Yu Xiang-bing fan Shiqian Wei Limei Yu Yunqian Zhong Xue-Wang Gao fan Wu Ying Zhou State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500SichuanChina The Center of New Energy Materials and Technology School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu 610500SichuanChina Department of Engineering University of CambridgeCambridge CB30FAUnited Kingdom College of Chemistry Leshan Normal UniversityLeshan 614000SichuanChina Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China

Photocatalytic splitting of hydrogen sulfide(H2S) for hydrogen evolution is a promising method to solve the energy and environmental *** this work,S,N-codoped carbon dots(S,N-CDs)/graphitic carbon nitride(g-C3N4) nanosheet is synthesized by hydrothermal method as an efficient photocatalyst for the decomposition of *** addition to the characterization of the morphology and structure,chemical state,optical and electrochemical performances of S,N-CDs/g-C3N4,hydrogen evolution tests show that the activity of g-C3N4 is improved by introducing S,N-CDs,and the enhancement depends strongly on the wavelength of incident *** photocatalytic hydrogen production rate of S,N-CDs/g-C3N4 composite reaches 832 μmol g-1h-1, which is 38 times to that of g-C3N4 under irradiation at 460 *** functional theory calculations and electron paramagnetic resonance as well as photoluminescence technologies have altogether authenticated that the unique wavelength-dependent photosensitization of S,N-CDs on g-C3N4;meanwhile,a good match between the energy level of S,N-CDs and g-C3N4 is pivotal for the effective photocatalytic *** work has unveiled the detailed mechanism of the photocatalytic activity enhancement in S,N-CDs/g-C3N4 composite and showed its potential in photocatalytic splitting of H2S for hydrogen evolution.

关键词： Photosensitization S N-codoped carbon dots Hydrogen sulfide splitting Photocatalytic hydrogen evolution

CO_(2)-O_(2)环境中油井管钢的腐蚀研究

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全面腐蚀控制 2024年第1期38卷 115-118页

作者：张雅妮樊冰王思敏西安石油大学材料科学与工程学院陕西西安710065

油气田开采过程中井下环境复杂,影响因素较多,CO_(2)-O_(2)共存环境对油井管钢造成严重腐蚀且目前研究较少,所以分析CO_(2)-O_(2)环境中油井管钢的腐蚀行为很有必要。本文通过对CO_(2)-O_(2)共存环境中油井管钢腐蚀机制的研究,结果如下:... 详细信息

油气田开采过程中井下环境复杂,影响因素较多,CO_(2)-O_(2)共存环境对油井管钢造成严重腐蚀且目前研究较少,所以分析CO_(2)-O_(2)环境中油井管钢的腐蚀行为很有必要。本文通过对CO_(2)-O_(2)共存环境中油井管钢腐蚀机制的研究,结果如下:(1)CO_(2)腐蚀在早期成膜后速度下降到很低,CO_(2)-O_(2)共存环境下腐蚀速率一直保持较高。(2)单一CO_(2)环境腐蚀后钢表面生成致密FeCO_(3)膜,保护基体防止继续腐蚀,而在CO_(2)-O_(2)共存环境下,腐蚀产物主要为FeCO_(3)和Fe氧化物,其中Fe氧化物使得FeCO_(3)晶体间的附着力降低,膜层疏松多孔,从而促进腐蚀。(3)温度升高使氧的传质速度加快,腐蚀产物中保护性较差的Fe氧化物增多,导致腐蚀速率急剧增加。

关键词： CO_(2)-O_(2)腐蚀腐蚀机制腐蚀影响因素

Thermal Error Compensation of the Wear-Depth Real-Time Detecting of Self-Lubricating Spherical Plain Bearings

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Chinese Journal of Mechanical Engineering 2018年第5期31卷 35-47页

作者： Zhan-Qi Hu Wei Li Yu-Lin Yang bing-Li fan Hai-Li Zhou Aviation Key Laboratory of Science and Technology on Generic Technology of Aviation Self-Lubricating Spherical Plain Bearing Yanshan University

The spherical plain bearing test bench is a necessary detecting equipment in the research process of self?lubricating spherical plain bearings. The varying environmental temperatures cause the thermal deformation of the wear?depth detecting system of bearing test benches and then a ect the accuracy of the wear?depth detecting data. However, few researches about the spherical plain bearing test benches can be found with the implementation of the detect?ing error compensation. Based on the self?made modular spherical plain bearing test bench, two main causes of ther?mal errors, the friction heat of bearings and the environmental temperature variation, are analysed. The thermal errors caused by the friction heat of bearings are calculated, and the thermal deformation of the wear?depth detecting sys?tem caused by the varying environmental temperatures is detected. In view of the above results, the environmental temperature variation is the main cause of the two error factors. When the environmental temperatures rise is 10.3 °C, the thermal deformation is approximately 0.01 mm. In addition, the comprehensive compensating model of the thermal error of the wear?depth detecting system is built by multiple linear regression(MLR) and time series analysis. Compared with the detecting data of the thermal errors, the comprehensive compensating model has higher fitting precision, and the maximum residual is only 1 μm. A comprehensive compensating model of the thermal error of the wear?depth detecting system is proposed, which provides a theoretical basis for the improvement of the real?time wear?depth detecting precision of the spherical plain bearing test bench.

关键词： Self?lubricating spherical plain bearing Wear depth Bearing test bench Thermal error Error compensation

The Existence of Even Regular Factors of Regular Graphs on the Number of Cut Edges

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Acta Mathematica Sinica,English Series 2010年第12期26卷 2305-2312页

作者： Hong bing fan Gui Zhen LIU Ji Ping LIU He Ping LONG Department of Computer Science Wilfrid Laurier University Waterloo ON N2L 3C5 Canada School of Mathematics Shandong University Ji'nan 250100 P. R. China Department of Computer Science University of Lethbridge Lethbridge AB. T1K 3M4 Canada

For any even integer k and any integer i, we prove that a （kr ＋i）-regular multigraph contains a k-factor if it contains no more than kr - 3k/2＋ i ＋ 2 cut edges, and this result is the best possible to guarantee the existence of k-factor in terms of the number of cut edges. We further give a characterization for k-factor free regular graphs.

关键词： Regular graph factor cut edge

A cathodic arc enhanced middle-frequency magnetron sputter system for deposition of hard protective coatings

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Nuclear Science and Techniques 2006年第3期17卷 135-138页

作者： HUANG Zhi-Hong YANG bing fan Xiang-Jun FU De-Jun Accelerator Laboratory Department of Physics Wuhan University Wuhan 430072 China

A new cathode arc enhanced magnetron sputter system for deposition of hard protective coatings is reported in this article. This system consists of eight targets: four outer targets are mounted on the wall of the chamber and four inner targets are placed around the center of the chamber. The outer and inner targets form four pair targets and are powered by four middle frequency power supplies. One of the outer targets can run either in the cathode arc mode or in the magnetron sputter mode. The Ti-containing diamond-like carbon nanocomposite coatings were deposited by using this system. The prepared coating exhibits high hardness (∼20 GPa), good adhesion (critical load is 50 N), very low friction coefficient (∼0.07), and excellent tribological performance with a wear rate of 1.4 × 10 −16 m 3 -·N −1 ·m −1 .

关键词：阴极弧中频磁控管溅射类金刚石碳内靶

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芍药PlHDR基因的克隆及生物信息学分析

榆林学院学报 2024年第5期34卷 37-42,47页

作者：范丙友王静陈洁余翔宇吴疆河南科技大学农学院河南洛阳471023 榆林学院信息工程学院陕西榆林719000

为了预测芍药4-羟基-3-甲丁-2-烯基二磷酸还原酶(PlHDR)基因的功能,以芍药叶为材料,基于RT-PCR技术克隆了芍药PlHDR基因并对其进行了序列分析,用生物信息学软件预测了PlHDR的物理化学性质及结构特征。结果表明,芍药PlHDR基因cDNA全长155... 详细信息

为了预测芍药4-羟基-3-甲丁-2-烯基二磷酸还原酶(PlHDR)基因的功能,以芍药叶为材料,基于RT-PCR技术克隆了芍药PlHDR基因并对其进行了序列分析,用生物信息学软件预测了PlHDR的物理化学性质及结构特征。结果表明,芍药PlHDR基因cDNA全长1559 bp,共编码462个氨基酸,分子量52.11 kDa,等电点为5.46;芍药PlHDR与喜树HDR亲缘关系最近,氨基酸相似性高达87.45%;芍药PlHDR是定位于叶绿体内的亲水性蛋白,不存在跨膜结构域及信号肽,含有5个糖基化位点和50个磷酸化位点;二级结构中α-螺旋和无规则卷曲分别占比48.48%和29.22%;3D结构预测为单体;芍药PlHDR与HDS、DXR、CDPMEK、MK和MVD1等蛋白存在相互作用。本研究报道了芍药PlHDR基因序列并对其进行了生物信息学分析,为进一步开展该基因在芍药萜类物质合成中的功能研究奠定了基础。

关键词：芍药 4-羟基-3-甲丁-2-烯基二磷酸还原酶基因克隆生物信息学分析萜类化合物