Corrosion Law and Corrosion Prediction of Sucker Rod in CO2 Composite Steam Flooding Production Well
摘 要
针对CO2复合蒸汽驱采出井抽油杆的腐蚀问题,在高温高压釜中进行了模拟腐蚀试验,研究了温度(60~120 ℃),CO2分压(0.1~0.3 MPa)和氯离子含量(1~3 g/L)对抽油杆腐蚀的影响,并建立了预测抽油杆腐蚀速率的数学模型,绘制了综合考虑多因素的腐蚀速率预测图版。结果表明:随温度的升高,抽油杆的腐蚀速率先升高后降低,90 ℃时达最大值(0.939 1 mm/a);随着CO2分压和氯离子含量的升高,腐蚀速率均逐渐增大,腐蚀主控因素为CO2分压;腐蚀预测图版的预测结果与试验结果吻合良好,腐蚀预测图版具有较好的预测精准度和实用性。
Abstract
Aiming at the corrosion problem of sucker rod in CO2 composite steam flooding production well, simulated corrosion tests were carried out in a high temperature and high pressure autoclave to study the effects of temperature (60-120 ℃), partial pressure of CO2 (0.1-0.3 MPa) and chloride ion concentration (1-3 g/L) on the corrosion of the sucker rod. A mathematical model for predicting the corrosion rate of sucker rods was established, and a corrosion rate prediction chart with comprehensive consideration of multiple factors was drawn. The results show that the corrosion rate of sucker rod increased first and then decreased with the increase of temperature, and reached the maximum value of 0.939 1 mm/a at 90 ℃. With the increase of partial pressure of CO2 and chloride ion concentration, the corrosion rate of sucker rod gradually increased, and the main controlling factor of corrosion was partial pressure of CO2. The predicted results from the corrosion prediction plate were in good agreement with the experimental results, so the corrosion prediction plate had good prediction accuracy and practicability.
中图分类号 TE982 DOI 10.11973/fsyfh-202108004
所属栏目 试验研究
基金项目 国家自然科学基金(51774249);四川省科技计划(21JCQN0066)
收稿日期 2019/11/28
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引用该论文: TIAN Gang,YI Yonggang,HAN Xue,CAI Lele,YU Huiyong,ZENG Dezhi. Corrosion Law and Corrosion Prediction of Sucker Rod in CO2 Composite Steam Flooding Production Well[J]. Corrosion & Protection, 2021, 42(8): 21
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【6】张国华,张国庆,李妍. 油气田CO2腐蚀典型预测模型的比较及探究[J]. 全面腐蚀控制,2008,22(4):47-51.
【7】邬元月,石善志,黄建波,等. 含CO2高温蒸汽环境中低合金钢耐腐蚀性能评价[J]. 石油与天然气化工,2017,46(4):77-81.
【8】王金忠,黄晓蒙,彭政德,等. 酸性天然气注入参数对管柱腐蚀的影响[J]. 断块油气田,2019,26(3):394-398.
【9】ZENG D Z,DONG B J,SHI S Z,et al. Effects of temperature on corrosion of N80 and 3Cr steels in the simulated CO2 auxiliary steam drive environment[J]. Arabian Journal for Science and Engineering,2018,43(7):3845-3854.
【10】DONG B J,ZENG D Z,YU Z M,et al. Corrosion mechanism and applicability assessment of N80 and 9Cr steels in CO2 auxiliary steam drive[J]. Journal of Materials Engineering and Performance,2019,28(2):1030-1039.
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