<strong>3Cr</strong>合金钢在尿素辅助稠油蒸汽吞吐环境中的初期腐蚀行为

doi:10.11902/1005.4537.2023.206

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 480-488 CSTR: 32134.14.1005.4537.2023.206 DOI: 10.11902/1005.4537.2023.206

研究报告

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3Cr合金钢在尿素辅助稠油蒸汽吞吐环境中的初期腐蚀行为

张运军¹, 蒋有伟¹(

), 张忠义¹, 吕乃欣², 陈君伟¹, 连国锋¹

^1.中国石油勘探开发研究院热力采油研究所提高油气采收率全国重点实验室北京 100083
^2.中国石油集团石油管工程技术研究院腐蚀与防护研究所西安 710077

Initial Corrosion Behavior of 3Cr Alloy Steel in Urea Assisted Heavy Oil Steam Huff and Puff Environments

ZHANG Yunjun¹, JIANG Youwei¹(

), ZHANG Zhongyi¹, LV Naixin², CHEN Junwei¹, LIAN Guofeng¹

^1.State Key Laboratory of Enhanced Oil&Gas Recovery, Research Institute of Petroleum Exploration & Development, PetroChina Co., Ltd., Beijing 100083, China
^2.Tubular Goods Research Institute, CNPC, Xi'an 710077, China

引用本文:

张运军, 蒋有伟, 张忠义, 吕乃欣, 陈君伟, 连国锋. 3Cr合金钢在尿素辅助稠油蒸汽吞吐环境中的初期腐蚀行为[J]. 中国腐蚀与防护学报, 2024, 44(2): 480-488.
Yunjun ZHANG, Youwei JIANG, Zhongyi ZHANG, Naixin LV, Junwei CHEN, Guofeng LIAN. Initial Corrosion Behavior of 3Cr Alloy Steel in Urea Assisted Heavy Oil Steam Huff and Puff Environments[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 480-488.

全文: PDF(5907 KB) HTML

摘要:

采用挂片失重法、宏观形貌观察法、扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)等分析手段对3Cr合金钢在尿素辅助稠油蒸汽吞吐环境中的初期腐蚀行为进行了研究。结果表明，3Cr合金钢在尿素辅助稠油蒸汽吞吐环境中的初期腐蚀为高温蒸汽中CO₂(酸性气体)与NH₃(碱性气体)相互耦合下的腐蚀，呈现出均匀腐蚀特征，表面腐蚀产物主要是FeCO₃。当10%<尿素溶液浓度≤20%时，随着尿素溶液浓度的增大，腐蚀产物量越大，越加致密。当尿素溶液浓度≥30%时，随着尿素溶液浓度的增大，腐蚀产物膜与金属基体的附着力越弱，甚至会大面积剥落。在尿素辅助蒸汽吞吐采出井井筒环境中，没有原油存在下，由于当尿素溶液浓度大于10%时，3Cr合金钢平均腐蚀速率大于油田腐蚀控制指标0.076 mm/a，不推荐使用。有原油存在下，30%浓度尿素溶液中3Cr合金钢的腐蚀速率大于0.076 mm/a，耐腐蚀性较差，不能满足采出井井筒腐蚀控制要求，也不推荐使用。但当加入原油后，3Cr合金钢的平均腐蚀速率比不加原油的有所下降，原油的掺入，由于形成几何覆盖效应，具有一定的缓蚀作用。所以建议设计现场试验方案时，尿素溶液的浓度不要超过10%。

关键词 ： 3Cr合金钢, 尿素腐蚀, 腐蚀产物, 稠油油藏, 蒸汽吞吐

Abstract：

The initial corrosion behavior of 3Cr alloy steel in urea assisted heavy oil steam huff and puff environments was studied by means of mass loss measurement, macroscopic morphology observation, SEM, EDS, XRD and XPS. The results show that the initial corrosion of 3Cr alloy steel in urea assisted heavy oil steam huff and puff environment is a synergistic corrosion of CO₂ (acid gas) and NH₃ (alkaline gas) in high temperature steam, showing uniform corrosion characteristics. The corrosion products are mainly FeCO₃. When the concentration of urea solution is in the range between 10% and 20%, with the increase of the concentration of urea solution, the amount and compactness of corrosion products all increase. When the concentration of urea solution higher than 30%, the adhesion of the corrosion product scale to the steel substrate becomes weaker with the increase of the concentration of urea solution, as a result, obvious spallation of the formed scales may emerge. If there not crude oil exists in the wellbore environment of the urea assisted steam huff and puff production well, the average corrosion rate of 3Cr alloy steel is higher than the oilfield corrosion control index 0.076 mm/a when the concentration of urea solution is greater than 10%, so that this operating condition is not recommended. In the presence of crude oil, the corrosion rate of 3Cr alloy steel is greater than 0.076 mm/a for 30% urea solution, apparently which cannot meet the requirements of wellbore corrosion control in production wells, therefore, this operating condition is not recommended too. Anyhow, the average corrosion rate of 3Cr alloy steel with crude oil is lower than that without crude oil. The incorporation of crude oil has certain corrosion inhibition effect due to the geometric covering effect. Therefore, it is suggested that the concentration of urea solution should not exceed 10% when designing the site operation scheme.

Key words： 3Cr alloy steel urea corrosion corrosion product heavy oil reservoir steam huff and puff

收稿日期: 2023-06-29 32134.14.1005.4537.2023.206

ZTFLH:

TG172

基金资助:国家科技重大专项(2016ZX05012-001)

通讯作者: 蒋有伟，E-mail：jiangyw@petrochina.com.cn，研究方向为油田开发

Corresponding author: JIANG Youwei, E-mail: jiangyw@petrochina.com.cn

作者简介: 张运军，男，1978年生，硕士，高级工程师

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图1 高温高压动态腐蚀实验设备的结构示意图

图2 试样尺寸

表1 高温高压动态腐蚀实验方案

图3 3Cr合金钢在50和80℃下不同浓度尿素溶液中的腐蚀速率

图4 3Cr合金钢在50和80℃下不同浓度尿素溶液中腐蚀后的宏观形貌

图5 3Cr合金钢在50℃不同浓度尿素溶液中腐蚀后的表面微观形貌

图6 3Cr合金钢在50℃不同浓度尿素溶液中表面腐蚀产物EDS分析

图7 3Cr合金钢在50℃不同浓度尿素溶液中腐蚀产物XRD谱

图8 3Cr合金钢在50℃下20%浓度尿素溶液中表面腐蚀产物XPS谱

图9 3Cr合金钢在不同比例原油与30%尿素溶液的混合液中腐蚀速率

图10 3Cr合金钢在50和80℃下不同比例原油与30%浓度尿素溶液的混合液中腐蚀后的宏观形貌

图11 不同温度下碳钢在Fe-H2O-CO2体系中的E-pH图

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