准噶尔盆地南缘煤层气井管柱腐蚀原因及防腐策略

doi:10.3969/j.issn.1006-6535.2023.05.020

特种油气藏 ›› 2023, Vol. 30 ›› Issue (5): 151-157.DOI: 10.3969/j.issn.1006-6535.2023.05.020

准噶尔盆地南缘煤层气井管柱腐蚀原因及防腐策略

王俊博^1,2, 田继军^1,2, 李飞³, 张轩铭⁴, 季东良³, 王先美⁵, 李鑫^1,2

1.新疆中亚造山带大陆动力学与成矿预测自治区重点实验室,新疆乌鲁木齐 830017;
2.新疆大学,新疆乌鲁木齐 830017;
3.乌鲁木齐国盛汇东新能源有限公司,新疆乌鲁木齐 831400;
4.中国石油新疆油田分公司,新疆克拉玛依 834000;
5.乌鲁木齐国盛达成新能源有限公司,新疆乌鲁木齐 830039

收稿日期:2023-01-29 修回日期:2023-07-05 出版日期:2023-10-25 发布日期:2023-12-25
通讯作者: 王先美(1967—),男,高级工程师,1990年毕业于江汉石油学院测井专业,2006年毕业于中国科学院构造地质学专业,获博士学位,现从事非常规油气勘探开发地质与工程技术应用研究工作。
作者简介:王俊博(1994—),男,2017毕业于中国地质大学(北京)安全工程专业,现为新疆大学地质资源与地质工程专业在读硕士研究生,从事非常规油气勘探开发研究工作。
基金资助:
国家自然科学青年基金“热作用下准东低阶煤渗透率动态演化及其煤岩学控制”(42002188);新疆维吾尔自治区科技重大专项“新疆难开采煤炭煤层气资源高效开发技术”(022A03015)

Causes of Corrosion and Anticorrosion Strategies of Pipe String in Coalbed Methane Wells at the Southern Margin of Junggar Basin

Wang Junbo^1,2, Tian Jijun^1,2, Li Fei³, Zhang Xuanming⁴, Ji Dongliang³, Wang Xianmei⁵, Li Xin^1,2

1. Key Laboratory of Continental Dynamics and Mineral Formation Prediction of Central Asian Orogenic Belt in Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830017, China;
2. Xinjiang University, Urumqi, Xinjiang 830017, China;
3. Urumqi Guosheng Huidong New Energy Co., Ltd, Urumqi, Xinjiang 831400, China;
4. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
5. Urumqi Guosheng Dacheng New Energy Co., Ltd, Urumqi, Xinjiang 830039, China

Received:2023-01-29 Revised:2023-07-05 Online:2023-10-25 Published:2023-12-25

摘要/Abstract

摘要： 准噶尔盆地南缘HD区块低阶煤成因煤层气井管柱腐蚀现象普遍且严重,制约煤层气井正常生产。有别于中、高阶煤成因煤层气井管柱腐蚀,HD区块井管柱腐蚀诱因复杂多样,不仅与产出流体特征相关,也与区块煤岩属性、区域地质条件以及钻完井井身结构等密切相关。基于HD区块管柱腐蚀特征,结合产出液/气、腐蚀物组分等分析数据,对管柱腐蚀的机理和管柱防腐策略进行分析和研究。研究表明:HD区块井管柱腐蚀类型以电化学腐蚀为主,应力腐蚀、荷电煤粉腐蚀、潜在CO₂腐蚀等为辅,而且同类腐蚀现象具有分区分片集中出现的潜在规律。根据HD区块气井管柱腐蚀特征,提出了煤层气井管柱腐蚀防治策略,现场应用取得了初步成效。研究结果可为低阶煤成因煤层气井管柱腐蚀机理分析以及防腐策略制订提供理论与技术指导。

关键词: 低阶煤成因煤层气, 管柱腐蚀, 电化学腐蚀, 准噶尔盆地

Abstract: The corrosion of pipe string in coalbed methane (CBM) wells of low-rank coal genesis in HD block at the southern margin of Junggar Basin is common and serious, which restricts the normal production of CBM wells. Unlike the corrosion of pipe string in CBM wells of middle rand-and high-rank coal genesis, the causative factors of pipe string corrosion in HD block are complex and diverse, which are not only related to the characteristics of produced fluids, but also closely related to the properties of coal rocks in the block, the regional geologic conditions, and the borehole structure of drilled and completed wells. Based on the corrosion characteristics of the pipe string in HD block, combined with the analysis data of produced fluid/gas and corrosive components, the mechanism of pipe string corrosion and the strategy of pipe string corrosion prevention were analyzed and researched. The study shows that the corrosion type of pipe string in HD block wells is mainly the electrochemical corrosion, supplemented by stress corrosion, charged pulverized coal corrosion, potential CO₂ corrosion, etc., and the same kind of corrosion has a potential pattern of concentration by zone or by subzone. According to the corrosion characteristics of gas well pipe strings in HD block, a strategy for preventing and controlling the corrosion of CBM well pipe strings is proposed, and preliminary results have been achieved after application. The results of the study can provide theoretical and technical guidance for the analysis of the corrosion mechanism and the formulation of corrosion prevention strategies for pipe strings in CBM wells of low-rank coal genesis.

Key words: CBM of low-rank coal genesis, pipe string corrosion, electrochemical corrosion, Junggar Basin

中图分类号:

TE38

王俊博, 田继军, 李飞, 张轩铭, 季东良, 王先美, 李鑫. 准噶尔盆地南缘煤层气井管柱腐蚀原因及防腐策略[J]. 特种油气藏, 2023, 30(5): 151-157.

Wang Junbo, Tian Jijun, Li Fei, Zhang Xuanming, Ji Dongliang, Wang Xianmei, Li Xin. Causes of Corrosion and Anticorrosion Strategies of Pipe String in Coalbed Methane Wells at the Southern Margin of Junggar Basin[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 151-157.

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准噶尔盆地南缘煤层气井管柱腐蚀原因及防腐策略

Causes of Corrosion and Anticorrosion Strategies of Pipe String in Coalbed Methane Wells at the Southern Margin of Junggar Basin

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