基于腐蚀预测和强度计算的油管服役寿命评估

doi:10.11902/1005.4537.2023.193

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 781-788 CSTR: 32134.14.1005.4537.2023.193 DOI: 10.11902/1005.4537.2023.193

研究报告

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基于腐蚀预测和强度计算的油管服役寿命评估

张明¹, 龚宁¹, 张博¹, 霍宏博², 李浩男², 钟显康³(

)

1.中海石油(中国)有限公司天津分公司海洋石油高效开发国家重点实验室天津 300459
2.西南石油大学石油与天然气工程学院成都 610500
3.西安交通大学化学工程与技术学院西安 710049

Evaluation of Tubing Service Life Based on Corrosion Prediction and Strength Calculation

ZHANG Ming¹, GONG Ning¹, ZHANG Bo¹, HUO Hongbo², LI Haonan², ZHONG Xiankang³(

)

1. State Key Laboratory of Efficient Offshore Oil Development, Tianjin Branch of CNOOC, Tianjin 300459, China
2. School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
3. School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China

引用本文:

张明, 龚宁, 张博, 霍宏博, 李浩男, 钟显康. 基于腐蚀预测和强度计算的油管服役寿命评估[J]. 中国腐蚀与防护学报, 2024, 44(3): 781-788.
Ming ZHANG, Ning GONG, Bo ZHANG, Hongbo HUO, Haonan LI, Xiankang ZHONG. Evaluation of Tubing Service Life Based on Corrosion Prediction and Strength Calculation[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 781-788.

全文: PDF(2956 KB) HTML

摘要:

以海上气井为例，首先建立井筒-地层有限元模型，对各级管柱的温度和Mises应力分布进行计算；然后，选用合适的CO₂/H₂S腐蚀预测模型计算油管的腐蚀速率。以油管的安全系数作为评价安全性能的指标，完成了油管服役寿命评估。结果表明：随着管柱由井口向地层的不断延伸，各级井筒的温度和Mises应力逐渐升高。在油管末端，温度和Mises应力均达到最大值，分别为207℃和447 MPa。井口油管的腐蚀速率最高，达到0.21 mm/a。在不采取任何防腐措施的情况下，油管服役至第24年时，井口处的抗拉安全系数低于安全阈值；当添加缓蚀剂且缓蚀效率为90%时，油管可安全服役超过50年。

关键词 ：服役寿命, 高温高压, 有限元分析, 腐蚀预测

Abstract：

In high-temperature and high-pressured environments containing CO₂ and H₂S, the failure risk of downhole string is extremely high, which seriously threatens the safety of production. Therefore, it is of great significance to evaluate the service life of tubular column. In this paper, taking offshore gas wells as an example, the Mises stress distribution and temperature distribution were obtained through the shaft-formation finite element model. Then, an appropriate CO₂/H₂S corrosion prediction model was used to calculate the corrosion rate of tubing. Finally, taking the safety factor of tubing as the evaluation criteria of safety performance, the evaluation of tubing service life is completed. The results showed that the Mises stress and temperature at all levels of wellbore increased with the increase of the running depth of tubular column. At the end of tubing, the maximum temperature and Mises stress are 207^oC and 447 MPa, respectively. In addition, the corrosion rate of the wellhead tubing is the highest, reaching 0.21 mm/a, according to the operation results of the corrosion model. Based on the above results, the safe service life of the tubing without any anti-corrosion measures is only 24 a. However, when corrosion inhibitors are injected, tubing can be used safely for more than 50 a when the corrosion inhibition efficiency is up to 90%.

Key words： service life high temperature and high pressure finite element analysis corrosion prediction

收稿日期: 2023-06-12 32134.14.1005.4537.2023.193

ZTFLH:

TG174

通讯作者: 钟显康，E-mail: zhongxk@yeah.net，研究方向为油气田防腐防垢、氢能装备服役安全

Corresponding author: ZHONG Xiankang, E-mail: zhongxk@yeah.net

作者简介: 张明，男，1981年生，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.193 或 https://www.jcscp.org/CN/Y2024/V44/I3/781

图1 导热微元体示意图

图2 内压、外挤以及轴向力同时作用下的“三轴应力”示意图

图3 井身结构示意图

表1 深井管内天然气密度及其成分

图4 地层温度与深度关系图

图5 生产过程温度分布云图

图6 地层压力与深度关系图

图7 生产过程Mises应力分布云图

图8 油管腐蚀速率随井深变化曲线图

表2 模型计算结果与实验结果对照表

图9 无任何防腐措施情况下油管的安全系数随井深变化图

图10 当缓蚀效率为90%的情况下油管的安全系数随井深变化图

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