高钢级油井管在高温高压气井全生命周期环境中的腐蚀行为及寿命预测

doi:10.11902/1005.4537.2020.139

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 535-541 DOI: 10.11902/1005.4537.2020.139

研究报告

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高钢级油井管在高温高压气井全生命周期环境中的腐蚀行为及寿命预测

赵密锋¹, 付安庆²(

), 胡芳婷¹, 谢俊峰¹, 龙岩², 耿海龙¹

^1.中国石油塔里木油田公司油气工程研究院库尔勒 841000
^2.中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室西安 710077

Corrosion Behavior and Life Prediction of High Grade OCTG in Full-life-cycle Environment of High Temperature High Pressure Gas Well

ZHAO Mifeng¹, FU Anqing²(

), HU Fangting¹, XIE Junfeng¹, LONG Yan², GENG Hailong¹

^1.Oil and Gas Engineering Research Institute, Petro China Tarim Oilfield Company, Korla 841000, China
^2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China

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摘要:

采用高温高压腐蚀测试系统研究了140ksi高钢级油井管在高温高压气井全生命周期单环境和连续多环境中的腐蚀行为。结果表明，140ksi高钢级油井管在全生命周期单环境和连续多环境中的腐蚀速率均呈现为CR_鲜酸＞CR_残酸＞CR_地层水＞CR_凝析水的趋势，其中连续多环境中腐蚀行为表现出一定的“遗传效应”。地层水腐蚀介质中，140ksi高钢级油井管在单环境和连续多环境的腐蚀速率均随实验周期增加而减小，60 d后腐蚀速率趋于稳定。基于点蚀速率结果，采用有限元方法计算得到不同腐蚀状态下140ksi高钢级油井管的服役寿命。

关键词 ：高钢级油井管, 全生命周期, 单环境, 连续多环境, 寿命

Abstract：

The corrosion behavior of 140ksi high grade steels, namely the so-called oil country tubular goods (OCTG), in the single environment and multi-consecutive environment in the full-life-cycle of high pressure and high temperature gas wells was systematically studied via high pressure and high temperature corrosion testing system. The results showed that the decreasing trend of corrosion rates of 140ksi high grade OCTG steels in both single environment tests and multi-consecutive environment tests could be ranked as follows: CR_{fresh acid}＞CR_{used acid}＞CR_{formation water}＞CR_{condensate water}, and some “genetic effects” were also observed in the multi-consecutive environment tests. The corrosion rates of 140ksi high grade OCTG steels decreased with the increase of test time in the formation water for both single environment tests and multi-consecutive environment tests, which tended to be stable after 60 d exposure. Based on the pitting rates, the service life of 140ksi high grade OCTG steels under different corrosion conditions was calculated using the finite element method.

Key words： high grade OCTG full-life-cycle single environment multi-consecutive environment lifetime

收稿日期: 2020-08-01

ZTFLH:

TG174

基金资助:国家重点研发计划(2019YFF0217502);中石油重大科技专项(2018E-1809)

通讯作者: 付安庆 E-mail: fuanqing@cnpc.com.cn

Corresponding author: FU Anqing E-mail: fuanqing@cnpc.com.cn

作者简介: 付安庆，男，1981年生，博士，高级工程师

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引用本文:

赵密锋, 付安庆, 胡芳婷, 谢俊峰, 龙岩, 耿海龙. 高钢级油井管在高温高压气井全生命周期环境中的腐蚀行为及寿命预测[J]. 中国腐蚀与防护学报, 2021, 41(4): 535-541.
Mifeng ZHAO, Anqing FU, Fangting HU, Junfeng XIE, Yan LONG, Hailong GENG. Corrosion Behavior and Life Prediction of High Grade OCTG in Full-life-cycle Environment of High Temperature High Pressure Gas Well. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 535-541.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.139 或 https://www.jcscp.org/CN/Y2021/V41/I4/535

表1 气井全生命周期环境的腐蚀介质特征

图1 基于气井全生命周期的油井管腐蚀评价方法

图2 高钢级油井管在气井全生命周期单环境和连续多环境中的腐蚀速率对比

图3 高钢级油井管在气井全生命周期单环境中的微观腐蚀形貌

图4 高钢级油井管在气井全生命周期连续多环境中的微观腐蚀形貌

图5 点蚀深度的累计概率分布

图6 高钢级油井管在气井全生命周期连续多环境中 (60 d地层水) 的点蚀坑

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