| 谷林,周定照,陈欢,何松,冯桓榰,张智,邢希金.3Cr管材在含氧气驱生产井中腐蚀行为与防护研究[J].装备环境工程,2021,18(1):36-42. GU Lin,ZHOU Ding-zhao,CHEN Huan,HE Song,FENG Huan-zhi,ZHANG Zhi,XING Xi-jin.The Research of Corrosion Behavior and Protection of 3Cr Pipes in Production Wells Containing Oxygen Flooding[J].Equipment Environmental Engineering,2021,18(1):36-42. |
| 3Cr管材在含氧气驱生产井中腐蚀行为与防护研究 |
| The Research of Corrosion Behavior and Protection of 3Cr Pipes in Production Wells Containing Oxygen Flooding |
| 投稿时间：2020-09-29 修订日期：2020-11-19 |
| DOI：10.7643/issn.1672-9242.2021.01.006 |
| 中文关键词: 3Cr 油套管 注气开发 含氧气驱 腐蚀 防护中图分类号:TG172 文献标识码:A 文章编号:1672-9242(2021)01-0036-07 |
| 英文关键词:3Cr tubing and casing gas injection development oxygen flooding corrosion protection |
| 基金项目:中国海洋石油集团有限公司重大项目所属课题3(YXKY-2018-ZY-03) |
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| Author | Institution |
| GU Lin | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
| ZHOU Ding-zhao | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
| CHEN Huan | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
| HE Song | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
| FENG Huan-zhi | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
| ZHANG Zhi | Southwest Petroleum University, Chengdu 610500, China |
| XING Xi-jin | CNOOC Research Institute Co., Ltd, Beijing 100028, China |
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| 中文摘要: |
| 目的 针对注含氧气体开发井筒管材腐蚀问题，系统性开展生产井动态腐蚀实验研究，明确注含氧气体开发井筒全寿命周期管材腐蚀速率的大小，为全寿命周期防腐材质选择及防腐措施提供数据支撑和参考。方法 采用模拟渤海某油田生产井井口(27 ℃、2.0 MPa)、井中(98 ℃、13 MPa)、井底(135 ℃、18 MPa)工况，进行不同含氧量条件下的动态腐蚀实验，O2含量占总气体的3%(摩尔分数)，采用模拟油田伴生气组分(CO2含量占伴生气组分的4.13%、总气体组分的4.01%)，实验周期为14 d，实验材质3Cr管材，对照组采用13Cr材质，仅在井底工况进行试验分析。结果 由于生产井中O2(3%)和CO2(4.01%)共存，O2对CO2腐蚀起到显著催化作用，同时地层水电导率远高于注入井中的去离子水，因而随含氧量的升高，管材腐蚀速率急剧升高。3Cr和13Cr材质的腐蚀速率均远高于极严重腐蚀等级，单独使用材质防腐不适用于目标油田生产井工况。结论 针对氧气、二氧化碳协同腐蚀的工况特征，应采用3Cr材质加咪唑啉类缓蚀剂进行防腐，同时加强氧气浓度检测，或者考虑采用ISO 15156-3推荐的双相不锈钢22Cr、超级双相不锈钢25Cr或28Cr。 |
| 英文摘要: |
| Aiming at the problem of pipe corrosion in oxygen-containing gas development wellbore, this paper has systematically carried out dynamic corrosion experiment research on production wells, clarified the corrosion rate of pipes in the life cycle of oxygen-containing gas development wellbore, so as to provide data support and reference for the selection of anti-corrosion materials and anti-corrosion measures during the whole life cycle. The wellhead (27 ℃, 2.0 MPa), in-well (98 ℃, 13 MPa), and bottom (135 ℃, 18 MPa) working conditions of a production well in an oilfield in Bohai Sea are simulated to conduct dynamic corrosion experiments under different oxygen content conditions. O2 content accounts for the total gas 3mol%, using simulated oilfield associated gas components (CO2 content accounts for 4.13mol% of the associated gas components, 4.01mol% of the total gas components), the experiment period is 14 days, and the experiment material is 3Cr pipe. The control group is made of 13Cr material, and the test analysis is performed only in the bottom hole conditions. Due to the coexistence of O2 (3mol%) and CO2 (4.01mol%) in production wells, O2 has a significant catalytic effect on CO2 corrosion. At the same time, the conductivity of formation water is much higher than that of deionized water injected into wells, so the corrosion rate of pipes rises sharply with the increase of oxygen content. The test results show that the corrosion rates of 3Cr and 13Cr materials are much higher than the extremely severe corrosion level, and the use of materials alone for corrosion protection is not suitable for production well conditions in the target oilfield. In view of the characteristics of the synergistic corrosion conditions of oxygen and carbon dioxide corrosion, 3Cr material and imidazoline corrosion inhibitors should be used for corrosion protection, and oxygen concentration detection should be strengthened, or the use of duplex stainless steel 22Cr recommended by ISO 15156-3 and super duplex stainless steel 25Cr or 28Cr should be considered. |
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