| 陈华兴,庞铭,赵顺超,王宇飞,方涛.渤海L油田油井生产管柱腐蚀失效原因分析及对策[J].装备环境工程,2021,18(1):70-76. CHEN Hua-xing,PANG Ming,ZHAO Shun-chao,WANG Yu-fei,FANG Tao.Corrosion Failure Reason and Protection Measure of Oil well Production String in Bohai L Oilfield[J].Equipment Environmental Engineering,2021,18(1):70-76. |
| 渤海L油田油井生产管柱腐蚀失效原因分析及对策 |
| Corrosion Failure Reason and Protection Measure of Oil well Production String in Bohai L Oilfield |
| 投稿时间：2020-05-18 修订日期：2020-10-10 |
| DOI：10.7643/issn.1672-9242.2021.01.011 |
| 中文关键词: 油井 生产管柱 腐蚀 溶解氧 氯离子 硫酸盐还原菌 冲蚀中图分类号:TG172 文献标识码:A 文章编号:1672-9242(2021)01-0070-07 |
| 英文关键词:oil well production string corrosion dissolved oxygen chloridion sulfate reducing bacteria erosion |
| 基金项目:“十三五”国家科技重大专项示范工程项目(2016ZX05058) |
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| Author | Institution |
| CHEN Hua-xing | CNOOC China CO., Ltd., Tianjin Branch, Tianjin 300452, China |
| PANG Ming | CNOOC China CO., Ltd., Tianjin Branch, Tianjin 300452, China |
| ZHAO Shun-chao | CNOOC China CO., Ltd., Tianjin Branch, Tianjin 300452, China |
| WANG Yu-fei | CNOOC China CO., Ltd., Tianjin Branch, Tianjin 300452, China |
| FANG Tao | CNOOC China CO., Ltd., Tianjin Branch, Tianjin 300452, China |
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| 中文摘要: |
| 目的 渤海L油田部分油井管柱频繁发生腐蚀失效穿孔，严重影响油田正常生产，为了延长井下管柱服役时间，对管柱腐蚀失效原因和防护对策进行分析。方法 采用形貌观察、金相分析和扫描电镜等手段对失效管柱及腐蚀产物进行研究，同时从油田水离子组成、腐蚀性气体、细菌含量和管柱冲蚀等方面开展腐蚀原因分析。结果 失效油井管柱主要为局部穿孔和断裂，管柱内表面呈溃疡状，颜色主要为黄褐色、黑色。失效管段的金相组织与基体的金相组织均为珠光体+铁素体，呈蜂窝状腐蚀特征。腐蚀产物主要为Fe、O和C。结论 L油田油井管柱腐蚀的关键原因为油田水中溶解氧含量超标9倍以上，而氯离子质量浓度> 3500 mg/L，硫酸盐还原菌超标4倍，促进了管柱的局部腐蚀。油井潜油电泵分离器入口处流体的流态变为旋流，流速大幅提升，引起冲蚀，加剧了分离器的腐蚀失效。建议L油田加强油田水中溶解氧和氯离子含量的监测和控制，腐蚀油井更换防腐油管和防腐电泵，提升分离器抗冲蚀性能。 |
| 英文摘要: |
| The frequent corrosion failure and perforation of some oil well production strings in Bohai L Oilfield has a strong impact on normal production of oilfield. In order to prolong attended time of downhole pipe string, this paper analyzes the corrosion failure reason and protection measure of downhole pipe string. The failed pipe strings and corrosion product are studied by macroscopic morphology observing, metallographic structure analyzing and scanning electron microscope. Meanwhile corrosion reason is analyzed from ion composition of oilfield water, corrosion gas, bacteria and erosion. The result indicates that oil well production string of L oilfield has partial perforation and breakage. The inner surface of production string appears ulcerous corrosion and its colour is tawny and black. Metallographic structure of the failure pipe strings is composed of pearlite and ferrite, which is similar to matrix, and shows faveolate characteristic caused by corrosion. The main corrosion products are Fe, O and C. In conclusion, the key reason for the corrosion of oil well string in L Oilfield is that the dissolved oxygen in oilfield water exceeds the standard by 9 times, the chloridion concentration is greater than 3,500 mg/L, and sulfate reducing bacteria exceed the standard by 4 times, aggravating the partial corrosion of production string. Moreover, the flow state of the fluid at the intake of the electric submersible pump separator is changed to rotational flow, and the flow rate is greatly increased, resulting in erosion and aggravating the corrosion failure of the separator. It is suggested that L Oilfield should strengthen the monitoring and control of dissolved oxygen and chloridion in oilfield water. The corroded oil well should adopt anti-corrosion pipe and pump. In addition, the erosion resistance of separator should be improved. |
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