110ksi套管应力腐蚀行为研究
发布时间：2018-08-13 12:55
【摘要】：近年来,随着全球对油气资源需求量的不断增长,石油天然气开发开采所面临的形势日趋复杂。尤其是在高温、高压、高含H2S/CO2环境中,油套管的服役工况变得更加恶劣,会引发油套管在服役过程中出现应力腐蚀开裂。C110钢作为常用的一种套管钢,ISO15156-2和ISO11960标准并没有将C110钢定为抗硫钢,同时规定：当硫化氢分压极小且具有较高的pH值时,才能使用C110材质。同时,若在含硫化氢环境下使用C110套管而出现套管环境断裂问题,使用者需自己承担相应的责任。因此,对于C110套管钢的应力腐蚀行为研究极为重要,此研究可以为含硫化氢酸性油气田的套管评价优选提供一定的参考。针对这一问题本文做了如下研究： (1)对两种套管材料(国产C110钢和SMC110钢)的常规性能(理化性能和力学性能)进行测试,得到相应的化学成分、金相和夹杂物分析、硬度和冲击性能以及拉伸力学性能的性质,为后续的实验分析提供基础数据。 (2)通过DCB双悬臂梁实验计算国产C110和SMC110两种套管材料的断裂韧性值KISSC,并且对断口微观组织形貌等分析,研究了其应力腐蚀开裂机理。 (3)采用TEM(透射电镜)对两种套管的亚显微结构进行分析,从微观机制来研究两种套管材料的应力腐蚀开裂。 (4)对国产C110和SMC110两种套管材料在模拟工况条件下,进行高温高压恒载荷应力腐蚀实验,通过两种材料的强度损伤、断口分析以及表面损伤来分析研究其应力腐蚀开裂。 (5)通过以上实验研究,综合分析国产C110套管和SMCl10套管的抗SSC(抗硫化氢应力腐蚀开裂)性能。 研究成果为含硫气田油层套管的选材及其适用性评估、高强度套管制造工艺水平的提高提供了重要的参考。
[Abstract]:In recent years, with the increasing global demand for oil and gas resources, the situation of oil and gas exploitation is becoming more and more complex. Especially in the environment of high temperature, high pressure and high H2S/CO2, the service condition of oil casing becomes worse. Stress corrosion cracking occurs in oil casing during service. C110 steel, as a common casing steel, is not defined as sulfur resistant steel by ISO 15156-2 and ISO11960 standards. It is also stated that when hydrogen sulfide partial pressure is very small and has a high pH value, To use the C 110 material. At the same time, if the C110 casing is used in hydrogen sulfide environment and the casing environment is broken, the user should bear the corresponding responsibility. Therefore, it is very important to study the stress corrosion behavior of C110 casing steel, which can provide a certain reference for casing evaluation and selection in acid oil and gas fields containing hydrogen sulfide. This paper has done the following research: (1) the conventional properties (physical and chemical properties and mechanical properties) of two kinds of casing materials (domestic C110 steel and SMC110 steel) have been tested, and the corresponding chemical composition, metallography and inclusion analysis have been obtained. Hardness and impact properties, as well as tensile mechanical properties, It provides basic data for subsequent experimental analysis. (2) the fracture toughness of two kinds of casing materials, C110 and SMC110, is calculated by DCB double cantilever beam experiment, and the microstructure of fracture surface is analyzed. The mechanism of stress corrosion cracking was studied. (3) the submicroscopic structure of two kinds of casing was analyzed by TEM (Transmission Electron microscope). The stress corrosion cracking of two kinds of casing materials is studied from the microscopic mechanism. (4) the stress corrosion experiments of two kinds of casing materials, C110 and SMC110, under simulated working conditions, are carried out under high temperature and high pressure under constant load, and the strength damage of the two materials is obtained. Fracture analysis and surface damage are used to study the stress corrosion cracking of C110 casing and SMCl10 casing. (5) the SSC (hydrogen sulfide stress corrosion cracking) resistance of domestic C110 casing and SMCl10 casing is comprehensively analyzed. The research results provide an important reference for the selection of casing material and its applicability evaluation, and the improvement of manufacturing technology level of high strength casing in sulfur-bearing gas field.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE983
[Abstract]:In recent years, with the increasing global demand for oil and gas resources, the situation of oil and gas exploitation is becoming more and more complex. Especially in the environment of high temperature, high pressure and high H2S/CO2, the service condition of oil casing becomes worse. Stress corrosion cracking occurs in oil casing during service. C110 steel, as a common casing steel, is not defined as sulfur resistant steel by ISO 15156-2 and ISO11960 standards. It is also stated that when hydrogen sulfide partial pressure is very small and has a high pH value, To use the C 110 material. At the same time, if the C110 casing is used in hydrogen sulfide environment and the casing environment is broken, the user should bear the corresponding responsibility. Therefore, it is very important to study the stress corrosion behavior of C110 casing steel, which can provide a certain reference for casing evaluation and selection in acid oil and gas fields containing hydrogen sulfide. This paper has done the following research: (1) the conventional properties (physical and chemical properties and mechanical properties) of two kinds of casing materials (domestic C110 steel and SMC110 steel) have been tested, and the corresponding chemical composition, metallography and inclusion analysis have been obtained. Hardness and impact properties, as well as tensile mechanical properties, It provides basic data for subsequent experimental analysis. (2) the fracture toughness of two kinds of casing materials, C110 and SMC110, is calculated by DCB double cantilever beam experiment, and the microstructure of fracture surface is analyzed. The mechanism of stress corrosion cracking was studied. (3) the submicroscopic structure of two kinds of casing was analyzed by TEM (Transmission Electron microscope). The stress corrosion cracking of two kinds of casing materials is studied from the microscopic mechanism. (4) the stress corrosion experiments of two kinds of casing materials, C110 and SMC110, under simulated working conditions, are carried out under high temperature and high pressure under constant load, and the strength damage of the two materials is obtained. Fracture analysis and surface damage are used to study the stress corrosion cracking of C110 casing and SMCl10 casing. (5) the SSC (hydrogen sulfide stress corrosion cracking) resistance of domestic C110 casing and SMCl10 casing is comprehensively analyzed. The research results provide an important reference for the selection of casing material and its applicability evaluation, and the improvement of manufacturing technology level of high strength casing in sulfur-bearing gas field.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE983
【参考文献】
相关期刊论文 前10条
1 孙永兴;林元华;何龙;李天雷;施太和;刘婉颖;;酸性油气田油套管选材设计[J];腐蚀科学与防护技术;2011年01期
2 王选奎,黄雪松,陈普信,胡庆祥,郭学辉,郑家q，
本文编号：2181059
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