CO2驱注气管柱腐蚀失效分析
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1.陕西延长石油(集团)有限责任公司研究院;2.延长油田股份有限公司吴起采油厂

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TG172

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陕西省秦创原碳中和背景下油藏CO2地质封存关键技术“科学家+工程师”项目(2022KXJ-050);延长石油j集团“揭榜挂帅”项目(ycsy2021jbgs-A-04)


Corrosion Failure Analysis of CO2 Flooding Injection String
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Research Institute of Shaanxi Yangchang Petroleum (Group) Co., Ltd.

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    摘要:

    CO2驱油是CO2捕集、利用与封存(Carbon Capture,Utilization and Storage,简称 CCUS)技术中CO2地质利用环节的重要组成部分,延长油田开展CO2驱油与封存项目取得了良好的增油封碳效果,但实际CO2驱注入环境下的管柱腐蚀失效原因尚不明晰。利用扫描电镜、3D共聚焦显微镜、EDS(Energy Dispersive Spectrometer)、XRD(X-Ray Diffraction Spectroscopy)等实验手段对取自吴起某CO2驱油与封存示范区注气管柱的腐蚀形貌进行表征,并对管柱腐蚀产物进行分析,以期明确研究区CO2驱注气管柱腐蚀失效原因。结果表明:以CO2腐蚀为主导的局部腐蚀造成注气管柱的腐蚀失效,腐蚀产物包括FeCO3、Fe的高价氧化物及少量FeS。分析认为,低温CO2的连续注入不会引起管柱腐蚀,但CO2停注期间井筒温度回升、地层水上返使得注气管柱具备了发生CO2/H2S腐蚀的条件,且注气井转注水进一步加剧了管柱腐蚀。建议在CO2停注以及转注水期间加强对注气管柱的杀菌与防腐措施。

    Abstract:

    CO2 flooding is an important part of the CO2 geological utilization process in CCUS. The CO2 flooding and storage project carried out in the Yanchang Oilfield has achieved good results in increasing production and storing CO2. But the reasons of pipe string corrosion failure are still unclear during CO2 injection. Scanning electron microscopy, 3D confocal microscopy, EDS and XRD are used to characterize the corrosion morphology of the gas injection pipe string in the CO2 flooding and storage demonstration area of Wuqi Oilfield. The pipe string corrosion products are analyzed to clarify the reasons for pipe string failure caused by CO2 corrosion. The results show that local corrosion dominated by CO2 corrosion causes corrosion failure of the pipe string. Corrosion products include FeCO3, high-priced oxides of Fe and a small amount of FeS. Continuous injection of low-temperature CO2 cannot cause corrosion. However, the increase in wellbore temperature and the return of formation water caused by stopping CO2 injection can create conditions for CO2/H2S corrosion in the pipe string. In addition, pipe string corrosion is accelerated when gas injection wells are converted into water injection wells. It is recommended to strengthen the sterilization and anti-corrosion measures for the pipe string during the period of stopping CO2 injection and switching to water injection.

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江绍静,肖沛瑶,王珂,等. CO2驱注气管柱腐蚀失效分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-02
  • 最后修改日期:2024-06-06
  • 录用日期:2024-06-08
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