林海,许杰,范白涛,闫伟,袁伟伟,韩耀图.渤海油田井下管柱 CO2 腐蚀规律与防腐选材现状[J].表面技术,2016,45(5):97-103.
LIN Hai,XU Jie,FAN Bai-tao,YAN Wei,YUAN Wei-wei,HAN Yao-tu.Review on CO2 Corrosion Rule of Down-hole Strings in Bohai Oil Field and Current Status of Anticorrosion Material Selection[J].Surface Technology,2016,45(5):97-103 |
| 渤海油田井下管柱 CO2 腐蚀规律与防腐选材现状 |
| Review on CO2 Corrosion Rule of Down-hole Strings in Bohai Oil Field and Current Status of Anticorrosion Material Selection |
| 投稿时间：2016-01-03 修订日期：2016-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.05.015 |
| 中文关键词: 渤海 CO2腐蚀 腐蚀机理 影响因素 腐蚀规律 耐腐蚀性 |
| 英文关键词:Bohai CO2 corrosion corrosion mechanism influencing factors corrosion rule corrosion resistance |
| 基金项目:总公司科技重大专项（YXKY-2015-TJ-04） |
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| Author | Institution |
| LIN Hai | CNOOC China Limited, Tianjin Branch, Tianjin 300452, China |
| XU Jie | CNOOC China Limited, Tianjin Branch, Tianjin 300452, China |
| FAN Bai-tao | CNOOC China Limited, Tianjin Branch, Tianjin 300452, China |
| YAN Wei | China University of Petroleum, Beijing 102249, China |
| YUAN Wei-wei | CNOOC China Limited, Tianjin Branch, Tianjin 300452, China |
| HAN Yao-tu | CNOOC China Limited, Tianjin Branch, Tianjin 300452, China |
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| 中文摘要: |
| 随着渤海油田的快速发展， CO2 腐蚀成为阻碍油气田开发的关键因素之一，由 CO2 引起的油气井管材腐蚀破坏问题日益严峻，严重影响井下管柱的使用寿命，制约着渤海油田降本增效的发展目标。综述了 CO2 对井下管柱的腐蚀机理及影响因素，总结了渤海油田中油气产量较高区块的 CO2腐蚀情况及防腐选材研究现状，针对性调研了绥中 36-1、埕北等 10 个油田的生产井的 CO2 分压、温度分布及腐蚀情况，探讨了渤海油田水介质、 pH 值、 CO2分压、温度对 CO2腐蚀的影响规律。结果表明 CO2分压小于 0.023 MPa 时，碳钢油管未发现严重腐蚀；当 CO2 分压超过 0.2 MPa 时，井下管柱腐蚀破坏率迅速增加， CO2分压为 0.3 MPa 时，碳钢油管腐蚀比例约为 19.15%，这和理论研究一致。在渤海油田油气开发生产过程中，各种因素可能同时出现，并相互作用，加剧管材的 CO2 腐蚀。合金元素 Cr能显著提高油套管的抗腐蚀性，低 Cr 钢具有良好的耐腐蚀性能和经济性，未来低 Cr 油套管在渤海油田的适应性评价需要开展进一步的研究。 |
| 英文摘要: |
| With the rapid development of Bohai oilfield, CO2 corrosion becomes one of the key factors to hinder the development of oil and gas fields. Corrosion damage problem of tubing and casing caused by CO2 corrosion is becoming more and more serious in oil and gas wells, which has a serious influence on the working life of downhole tubing and restricts the “reducing costs and increasing benefits” development goals of Bohai oilfield. This paper reviewed CO2 corrosion mechanism of downhole tubing and its influencing factors, as well as the research status of anti-corrosion materials, summarized the corrosion situation of production wells for high oil and gas production blocks in Bohai oilfield, especially investigated CO2 partial pressure, temperature distribution and corrosion situation of production wells of SZ 36-1, CB and other 10 oilfields. Meanwhile, the influence laws of water medium, pH value, CO2 partial pressure on CO2 corrosion were discussed, and the results showed that carbon steel tubing had no serious corrosion when pCO2 <0.023 MPa; Corrosion damage rate of downhole tubing increased rapidly when pCO2 >0.2 MPa; Corrosion damage rate was about 19.15% when pCO2 was 0.3 MPa, which was in accordance with theoretical research. In the process of oil and gas development and production of Bohai oilfield, various factors might appear at the same time and interact with each other, which aggravated CO2 corrosion. The alloy element Cr could significantly increase the corrosion resistance of oil casing and tubing, and low Cr steels had good corrosion resistance and economy. The adaptability evaluation of low Cr casing and tubing in Bohai oilfield needs further research in the future. |
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