陇东油田Y区块油井管柱腐蚀特性及防护技术  

Corrosion Behavior and Protention Technology for Strings in Oil Well of Y District in Longdong Oilfield

作　　者：金祥哲 冯朋鑫[2,3] 徐军[1,2] JIN Xiangzhe;FENG Pengxin;XU Jun(Drilling Engineering Technology Institute,Chuanqing Drilling Engineering Company Ltd of CNPC,Xi′an 710018,China;National Engineering Laboratory of Low Permeability Oil Field Exploration and Development,Xi′an 710018,China;Oil&Gas Technology Research Institute,Changqing Oilfield Company of CNPC,Xi′an 710018,China)

机构地区：[1]中国石油川庆钻探工程有限公司钻采工程技术研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018 [3]中国石油长庆油田分公司油气工艺研究院,西安710018

出　　处：《腐蚀与防护》2022年第8期98-102,共5页Corrosion & Protection

基　　金：川庆钻探工程有限公司科技项目(CQ2019B-24-10-4)。

摘　　要：对陇东油田Y区块油井管柱腐蚀的现场情况开展详细调研,抽取现场样本井采出水进行水质分析。在采出水中对N80钢进行动/静态腐蚀试验,通过扫描电镜观察、能谱分析、电化学试验等分析了Y区块油井管柱腐蚀的主要特性。结果表明:N80钢不仅发生了均匀腐蚀,还发生了CO_(2)、H_(2)S等酸性气体腐蚀和SRB细菌腐蚀;在结垢趋势强的采出水中,形成的垢致密,附着于腐蚀界面起到防腐蚀作用,在结垢趋势相对弱的采出水中,腐蚀产物疏松,附着于界面而加速了局部腐蚀。通过对腐蚀特性研究,提出管柱材料处理和优选缓蚀剂HSJ-02(用量150mg/L并配合适宜含量的杀菌剂)的综合防腐蚀措施,该防腐蚀措施使3a内现场腐蚀开井维护作业量降低了56%。The field situation of strings in oil well of Y district in Longdong oilfield was investigated in detail.Water quality analysis of produced water from field sample wells was conducted.The main characteristics of string corrosion in oil well of Y district were analyzed by observation through scanning electron microscopy,energy spectrum analysis and electrochemical testing in the dynamic/static corrosion test of N80steel in the produced water.The results show that N80steel was not only uniformly corroded,but also corroded by CO_(2)and H_(2)S acidic gases and SRB bacteria.In the produced water with a strong scaling tendency,the formed scale was densely attached to the corrosion interface to prevent corrosion.In the produced water with a relatively weak scaling tendency,the corrosion products were loosely attached to the interface to accelerate localized corrosion.These anti-corrosion measures reduced field corrosion well maintenance operations by 56%over a period of three years.

关 键 词：陇东油田 油井井筒 腐蚀 特性研究 防护措施 

分 类 号：TG172[金属学及工艺—金属表面处理]