陇东地区煤层气井油管柱腐蚀机理研究

doi:10.11885/j.issn.1674-5086.2018.07.07.01

西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (1): 170-180.DOI: 10.11885/j.issn.1674-5086.2018.07.07.01

• 石油机械与油田化学 • 上一篇

陇东地区煤层气井油管柱腐蚀机理研究

陈立超^1,2, 王生维^2,3, 张典坤², 郭丁丁², 任龙锋²

1. 内蒙古工业大学矿业学院, 内蒙古呼和浩特 010051;
2. 晋煤集团煤与煤层气共采国家重点实验室, 山西晋城 048204;
3. 中国地质大学(武汉)资源学院, 湖北武汉 430074

收稿日期:2018-07-07 出版日期:2020-02-10 发布日期:2020-02-10
通讯作者: 陈立超,E-mail:chenlichaogas@163.com
作者简介:陈立超,1985年生,男,汉族,内蒙古赤峰人,副教授,博士,主要从事煤层气地质工程方面的研究工作。E-mail:chenlichaogas@163.com;王生维,1956年生,男,汉族,内蒙古呼和浩特人,教授,博士,主要从事煤层气地质工程方面的研究工作。E-mail:swwang@cug.edu.cn;张典坤,1985年生,男,汉族,山西晋城人,高级工程师,硕士,主要从事煤层气地质工程方面的研究工作。E-mail:fcxzdk@163.com;郭丁丁,1986年生,女,汉族,山西晋城人,工程师,硕士,主要从事煤与煤层气共采方面的研究工作。E-mail:409124572@qq.com;任龙锋,1984年生,男,汉族,山西晋城人,工程师,主要从事煤层气地面开发工艺方面的研究工作。E-mail:ren8404@126.com
基金资助:
山西省煤层气联合研究基金（2016012007）；甘肃省油气资源研究重点实验室开放基金（SZDKFJJ20160606）；内蒙古自然科学基金（2016MS0402）；内蒙古自治区高等学校科研项目（NJZY16090）；内蒙古工业大学科学研究项目（X201534）

Corrosion Mechanisms of Tubing String of Coalbed Methane Wells in Eastern Gansu

CHEN Lichao^1,2, WANG Shengwei^2,3, ZHANG Diankun², GUO Dingding², REN Longfeng²

1. School of Mining and Technology, Inner Mongolia University of Technology, Huhhot, Inner Mongolia 010051, China;
2. State Key Laboratory of Coal and CBM Co-mining, Jincheng Anthracite Mining Group, Jincheng, Shanxi 048204, China;
3. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China

Received:2018-07-07 Online:2020-02-10 Published:2020-02-10

摘要/Abstract

摘要： 煤层气井油管柱腐蚀导致的管柱穿孔和频繁卡泵是制约陇东地区煤层气资源开发的关键因素，确定煤层气井油管腐蚀形貌特征与产物成分，查明其腐蚀机制对于气井管材选型、防护措施改进意义重大。利用扫描电镜（SEM）及二次电子图像（SE）、背散射图像（BSE）对油管柱腐蚀产物膜形貌进行微观表征，采用能谱分析（EDS）标定腐蚀产物元素类型及含量，并通过X射线衍射分析了腐蚀产物的矿相，在此基础上提出本区煤层气井油管腐蚀机理及防护措施：本区煤层气井N80油管钢在高矿化度Cl^-、HCO₃^-地层水环境发生强烈CO₂腐蚀作用，形成多层结构腐蚀产物（FeCO₃）膜，由于腐蚀产物膜与金属基体结合强度低，在井筒流动介质冲刷下易发生剥离，且腐蚀产物膜疏松多孔致密性差，Cl^-易穿过产物膜接触金属基体，形成自催化腐蚀电偶，加速局部阳极溶解，生成大量点蚀坑，加剧了腐蚀穿孔伤害程度。选择含3% Cr油管材、加缓蚀剂（原油）与射孔完井是实现本区煤层气井油管柱整体腐蚀防护的可行措施。

关键词: 煤层气井, N80油管钢, CO₂腐蚀, 产物膜, 陇东地区

Abstract: The perforation of the oil tubing string caused by the corrosion and the frequent stuck pumps in coalbed methane (CBM) wells are the key factors restricting the development of CBM resources in eastern Gansu. This paper, by using scanning electron microscopy (SEM) and secondary electron image (SE), back scattering (BSE) to characterize the microstructure of corrosion scale and the energy spectrum analysis (EDS) calibration element types and contents of corrosion products, and through X-ray diffraction analysis of component of products, the corrosion mechanisms and protection measures of tubing string of CBM wells were proposed:CO₂ corrosion occurs to N80 steel of CBM Wells in this area in high salinity formation water, Cl^-, HCO₃^-, forming a multilayer structure corrosion scale (FeCO₃). Due to the low bonding strength between the corrosion scale and metal matrix in the wellbore flow, medium scour easily occurs under the stripping, and corrosion scale is porous density, Cl^- contacts the metal matrix to form autocatalytic galvanic corrosion, accelerate the localized anodic dissolution, and to generate a large number of spot corrosion pit, exacerbating the corrosion perforation damage. The selection of 3%Cr oil tubing, corrosion inhibitor (crude oil) and perforation completion is a feasible measure to realize the integral corrosion protection of tubing String of CBM wells in this area.

Key words: coalbed methane wells, N80 tubing steel, CO₂ corrosion, corrosion scale, eastern Gansu

中图分类号:

TE983

陈立超, 王生维, 张典坤, 郭丁丁, 任龙锋. 陇东地区煤层气井油管柱腐蚀机理研究[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 170-180.

CHEN Lichao, WANG Shengwei, ZHANG Diankun, GUO Dingding, REN Longfeng. Corrosion Mechanisms of Tubing String of Coalbed Methane Wells in Eastern Gansu[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 170-180.

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陇东地区煤层气井油管柱腐蚀机理研究

Corrosion Mechanisms of Tubing String of Coalbed Methane Wells in Eastern Gansu

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