井筒载荷-腐蚀耦合作用对碳钢套管服役寿命的影响
发布时间：2018-11-13 11:18
【摘要】：基于应力-腐蚀介质协同作用原理,结合化学力学效应理论,对高温高压超深井碳钢油、套管在使用过程中面临着CO2、H2S等腐蚀介质以及拉、压等复杂载荷建立了结合热应力影响套管腐蚀速率的解析模型,给出了计算应力影响管柱寿命衰减的解析公式,研究了碳钢油井管服役寿命,并对内压力、挂片实验实测腐蚀速率以及壁厚对碳钢套管服役寿命的影响进行了研究。结果表明,解析模型所得结果与文献报道的应力对腐蚀速率的影响结果相符。在井筒载荷及腐蚀工况下,增加壁厚相对于减小套管内压力,增加套管使用寿命效果不明显。初始腐蚀速率对套管的服役寿命影响较大,当管柱所受应力越大,管柱实际寿命衰减得越快。
[Abstract]:Based on the principle of the synergistic action of stress-corrosion medium and the theory of chemical mechanics effect, the casing is faced with corrosive medium such as CO2,H2S and pulling in the process of application of high-temperature and high-pressure ultra-deep well carbon steel oil. An analytical model of casing corrosion rate affected by thermal stress is established, and an analytical formula for calculating the attenuation of pipe string life is given. The service life of carbon steel oil well pipe is studied, and the internal pressure is also studied. The effect of corrosion rate and wall thickness on the service life of carbon steel casing was studied. The results show that the results obtained by the analytical model are in agreement with the results reported in the literature on the effect of stress on corrosion rate. Under wellbore load and corrosion condition, the effect of increasing wall thickness is not obvious to decrease casing pressure and increase casing service life. The initial corrosion rate has a great influence on the service life of the casing. When the stress on the string is greater, the actual life of the string decreases faster.
【作者单位】： 西南石油大学油气藏地质及开发工程国家重点实验室;中国海洋石油总公司;中海石油(中国)有限公司湛江分公司;
【基金】：国家重大科技专项(2016ZX05028-001-006、2016ZX05017-003) 四川省科技厅项目(2016JQ0010) 四川省省属高校科技创新团队建设计划资助项目(13TD0026)资助
【分类号】：TE983
本文编号：2328953
[Abstract]:Based on the principle of the synergistic action of stress-corrosion medium and the theory of chemical mechanics effect, the casing is faced with corrosive medium such as CO2,H2S and pulling in the process of application of high-temperature and high-pressure ultra-deep well carbon steel oil. An analytical model of casing corrosion rate affected by thermal stress is established, and an analytical formula for calculating the attenuation of pipe string life is given. The service life of carbon steel oil well pipe is studied, and the internal pressure is also studied. The effect of corrosion rate and wall thickness on the service life of carbon steel casing was studied. The results show that the results obtained by the analytical model are in agreement with the results reported in the literature on the effect of stress on corrosion rate. Under wellbore load and corrosion condition, the effect of increasing wall thickness is not obvious to decrease casing pressure and increase casing service life. The initial corrosion rate has a great influence on the service life of the casing. When the stress on the string is greater, the actual life of the string decreases faster.
【作者单位】： 西南石油大学油气藏地质及开发工程国家重点实验室;中国海洋石油总公司;中海石油(中国)有限公司湛江分公司;
【基金】：国家重大科技专项(2016ZX05028-001-006、2016ZX05017-003) 四川省科技厅项目(2016JQ0010) 四川省省属高校科技创新团队建设计划资助项目(13TD0026)资助
【分类号】：TE983
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