气田某区块集输管线腐蚀预测与防护技术

doi:10.11902/1005.4537.2025.340

中国腐蚀与防护学报

2026, Vol. 46

Issue (5): 1634-1642 CSTR: 32134.14.1005.4537.2025.340 DOI: 10.11902/1005.4537.2025.340

工程技术

本期目录 | 过刊浏览

气田某区块集输管线腐蚀预测与防护技术

谭军¹(

), 崔春江¹, 段明霞², 刘祥周¹, 孟海龙¹, 蒋瑛¹

^1.中国石油长庆油田分公司第三采气厂采气工艺研究所鄂尔多斯 017399
^2.中国石油长庆油田分公司培训中心西安 710021

Corrosion Prediction and Prevention for Gathering Pipelines in Gas Field

TAN Jun¹(

), CUI Chunjiang¹, DUAN Mingxia², LIU Xiangzhou¹, MENG Hailong¹, JIANG Ying¹

^1.The Third Gas Production Plant of Petro China Changqing Oilfield Company Gas Production Technology Research Institute, Erdos 017399, China
^2.Training Center of PetroChina Changqing Oilfield Company, Xi'an 710021, China

引用本文:

谭军, 崔春江, 段明霞, 刘祥周, 孟海龙, 蒋瑛. 气田某区块集输管线腐蚀预测与防护技术[J]. 中国腐蚀与防护学报, 2026, 46(5): 1634-1642.
Jun TAN, Chunjiang CUI, Mingxia DUAN, Xiangzhou LIU, Hailong MENG, Ying JIANG. Corrosion Prediction and Prevention for Gathering Pipelines in Gas Field[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(5): 1634-1642.

全文: PDF(8485 KB) HTML

摘要:

针对气田某区块集输管线的腐蚀风险突出，构建了涵盖腐蚀因素识别、腐蚀速率预测与防控策略优化的综合技术体系。通过模拟该区块集输管线腐蚀环境，采用正交实验结合熵权-秩和比法，揭示了CO₂分压、Cl^-浓度和硫酸盐还原菌(SRB)浓度为均匀腐蚀和局部腐蚀的主控因素，但对两类腐蚀的影响权重有差异。针对该腐蚀特征，将De Waard95 CO₂腐蚀模型进行了Cl^-浓度与微生物浓度的引入与修正，显著提升了模型预测精度，验证决定系数R²达80.98%。该研究还优选出十七烯基羟乙基咪唑啉季铵盐(OED)与苯扎氯铵(BKC)复配缓蚀杀菌剂，在模拟干管条件下实现了均匀缓蚀效率达94.25%，点蚀缓蚀率达90.74%，灭菌率接近100%。研究成果为该区块建立腐蚀预警与防护的成套技术提供了有效支撑。

关键词 ：气田, 集输管线, 腐蚀权重, 腐蚀预测, 缓蚀杀菌剂

Abstract：

The gathering pipelines of a gas field in the Northwestern region suffered from severe corrosion risk, hence a comprehensive technical countermeasure was then postulated covering the identification of corrosion factors, the prediction of corrosion-rate, and the optimization of prevention strategies. Herein, the corrosion behavior of the gathering pipeline steel was assessed via a simulation set of the corrosive environment for the pipelines of the gas field in this region, as well as an orthogonal experimental arrangement combined with the entropy-weight rank-sum ratio method. It was revealed that the CO₂ partial pressure, the chloride concentration, and the SRB activity were the main controlling factors for uniform corrosion and local corrosion, but the influence weights of these factors on the two types of corrosion were different. Further, a modified De Waard95 CO₂ corrosion model was developed by introducing correction terms for Cl^- concentration and microbial activity, which significantly improved the corrosion-rate prediction accuracy and achieved a determination coefficient (R²) of 80.98%. Considering the main corrosion factors in the gas field, an OED/BKC composite inhibiting biocide system was developed. In the simulated conditions, the corresponding inhibition rate for uniform corrosion reached 94.25% and that for pitting corrosion was 90.74% at optimal concentrations of 150 mg/L OED and 50 mg/L BKC, with nearly 100% effectiveness for sterilization. The proposed methodology provides a reliable technical basis for corrosion warning and prevention in this gas field.

Key words： gas filed gathering pipeline corrosion factor weight corrosion prediction inhibiting biocide

收稿日期: 2025-10-30 32134.14.1005.4537.2025.340

ZTFLH:

TE832

通讯作者: 谭军，E-mail：tanjun_cq@petrochina.com.cn，研究方向为天然气集输处理及完整性

Corresponding author: TAN Jun, E-mail: tanjun_cq@petrochina.com.cn

作者简介: 谭军，男，1983年生，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.340 或 https://www.jcscp.org/CN/Y2026/V46/I5/1634

No.	CO₂ partial pressure / MPa	pH $C O 2$	pH_actual	Total pressure / MPa	Flow velocity / m·s^-1	Temperature / ℃	Cl^- concentration / mg·L^-1	SRB content / cells·mL^-1
1	0.05	4.05	5.85	1.00	0.5	20	7000	11000
2	0.05	4.09	6.10	2.00	1.0	30	12000	13000
3	0.05	4.12	6.34	4.00	2.0	40	17000	20000
4	0.10	3.94	6.10	1.00	0.5	30	12000	20000
5	0.10	3.97	6.15	2.00	1.0	40	17000	11000
6	0.10	3.90	5.97	4.00	2.0	20	7000	13000
7	0.20	3.75	5.85	1.00	1.0	20	17000	13000
8	0.20	3.78	5.77	2.00	2.0	30	7000	20000
9	0.20	3.82	6.24	4.00	0.5	40	12000	11000
10	0.05	4.12	6.09	1.00	2.0	40	12000	13000
11	0.05	4.05	5.74	2.00	0.5	20	17000	20000
12	0.05	4.09	5.66	4.00	1.0	30	7000	11000
13	0.10	3.97	6.11	1.00	1.0	40	7000	20000
14	0.10	3.90	6.62	2.00	2.0	20	12000	11000
15	0.10	3.94	6.05	4.00	0.5	30	17000	13000
16	0.20	3.78	6.42	1.00	2.0	30	17000	11000
17	0.20	3.82	6.11	2.00	0.5	40	7000	13000
18	0.20	3.75	6.08	4.00	1.0	20	12000	20000

表1 模拟集输管线环境正交实验参数设置

图1 正交实验所得的均匀腐蚀速率分析结果

图2 正交实验所得的局部腐蚀速率分析结果

图3 腐蚀因素权重分析结果

表2 干管壁厚监测所得腐蚀速率

图4 腐蚀速率预测值与监测值相对关系

图5 添加不同浓度BKC的灭菌测试

图6 模拟6号干管环境中腐蚀14 d后样品表面微观形貌

图7 模拟6号干管环境中腐蚀14 d后样品表面微观形貌和点蚀分布图

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