含CO_2天然气井筒腐蚀速率评价方法研究及应用
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摘要
天然气井筒CO_2腐蚀问题严重影响了气井的正常生产,为了评估气井生产过程中井筒的安全性和使用寿命,需要对气井井筒腐蚀速率进行评价。气井井筒腐蚀环境复杂,常规的高温、高压腐蚀评价装置无法反映实际井筒内部流体对管柱的腐蚀状况,也不能研究含CO_2天然气在井筒流动中温度、压力变化引起系统相态变化对腐蚀的影响。设计了一套可以循环注气的高温、高压腐蚀速率评价装置,用于研究井筒中气流对井筒的腐蚀规律。利用该装置测定了P110和N80钢在含CO_2气体循环流动过程中的腐蚀速率,并对现场常用的几种气井缓蚀剂的性能进行了评价。
CO_2 corrosion seriously affected normal production in the gas well. It was necessary to determine the corrosion rate in order to estimate the safety and service life of the wellbore. Due to complex environmental conditions, conventional high-temperature and high-pressure corrosion evaluation device could not reflect actual status of the internal pipelines, nor could it study the influences of phase change on the corrosion caused by fluctuation of temperature and pressure in the CO_2-containing natural gas flow. Therefore, a set of high-temperature and high-pressure corrosion rate evaluation equipment which can recycle gas injection was designed. Corrosion rates of P110 and N80 steel in CO_2 gas circulation were assessed by this device. Besides, performances of several commonly used corrosion inhibitors in the gas well were assessed. At last, a method for evaluating the corrosion rate of gas wellbore was developed.
CO_2 corrosion seriously affected normal production in the gas well. It was necessary to determine the corrosion rate in order to estimate the safety and service life of the wellbore. Due to complex environmental conditions, conventional high-temperature and high-pressure corrosion evaluation device could not reflect actual status of the internal pipelines, nor could it study the influences of phase change on the corrosion caused by fluctuation of temperature and pressure in the CO_2-containing natural gas flow. Therefore, a set of high-temperature and high-pressure corrosion rate evaluation equipment which can recycle gas injection was designed. Corrosion rates of P110 and N80 steel in CO_2 gas circulation were assessed by this device. Besides, performances of several commonly used corrosion inhibitors in the gas well were assessed. At last, a method for evaluating the corrosion rate of gas wellbore was developed.
引文
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[2] YANG Zhibin,LIU Yahui,ZHU Tenglong.Mechanism analysis of CO2 corrosion on Ba0.9Co0.7Fe0.2Nb0.1O3-δcathode[J].International Journal of Hydrogen Energy,2016,41(3):1997-2001.
[3] 林玉珍,杨德钧.腐蚀和腐蚀控制原理[M].北京:中国石化出版社,2007:32-34.
[4] TRAN T,BROWN B,NESIC S.Corrosion of mild steel in an aqueous CO2 environment—Basic electrochemical mechanisms revisited[J].Journal of Adhesion Science & Technology,2016(23):1-21.
[5] ZHENG Y,NING J,BROWN B,et al.Electrochemical model of mild steel corrosion in a mixed H2S/CO2 aqueous environment in the absence of protective corrosion product layers[J].Corrosion-houston Tx-,2015,71(3):316-325.
[6] 王秀民,杜建平,仲为为,等.N80和P110钢在高温高压蒸汽中的耐蚀性[J].腐蚀与防护,2014,35(3):253-256.
[7] 王静.含CO/HS环境中油管钢的腐蚀行为及预测[D].西安:西安石油大学,2006.
[8] 吴明,孟向楠,陈旭,等.CO2腐蚀产物膜对金属腐蚀行为的影响的研究进展[J].材料科学与工程学报,2016,34(4):681-684.
[9] 左甜,刘小辉,蒋秀,等.超临界CO2输送管道的腐蚀研究进展[J].石油化工腐蚀与防护,2011,28(6):1-3.
[10] 何庆龙,孟惠民,俞宏英,等.N80油套管钢CO2腐蚀的研究进展[J].中国腐蚀与防护学报,2007,27(3):186-192.
[11] 王正品,王静,要玉宏,等.Z3CN20-09M钢高温高压水蒸气腐蚀行为研究[J].西安工业大学学报,2016,36(4):3-5.
[12] 汪长鹏,申宇凤,陈聪聪,等.蒸汽环境对消声器用439不锈钢腐蚀行为的影响[J].中国腐蚀与防护学报,2016,36(2):165-171.
[13] 谢涛,林海,许杰,等.不同材质油套管钢的CO2腐蚀行为[J].表面技术,2017(1):211-217.
[14] 王坤,李庆,云庆,等.集气管道CO2内腐蚀模拟研究[J].油气田地面工程,2017(1):47-49.
[15] 刘倩倩,李自力,程远鹏.正交试验法研究X90管线钢在CO2环境中的腐蚀行为[J].腐蚀与防护,2016,37(12):970-972.
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