非晶态镍钨合金镀层油管的耐CO2腐蚀性能  

CO2 Corrosion Resistance of Amorphous Nickel-Tungsten Alloy Coated Tubing

作　　者：唐泽玮[1,2] 姚斌[1,2] 姬振宁[1,2] 程世栋[3] 杨海恩 赵雪会 王尔珍[1,2] TANG Zewei;YAO Bin;JI Zhenning;CHEN Shidong;YANG Haien;ZHAO Xuehui;WANG Erzhen(Oil and Gas Technology Research Institute,Changqing Oilfield Branch Company,PetroChina,Xi’an 710018,China;National Engineering Laboratory of Low Permeability Oil and Gas Field Exploration and Development,Xi'an 710018,China;The Sixth Oil Production Plant,Changqing Oilfield Branch Company,PetroChina,Xi'an 710020,China;CNPC Tubular Goods Research Institute,Xi’an 710077,China)

机构地区：[1]长庆油田分公司油气工艺研究院,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]长庆油田分公司第六采油厂,西安710020 [4]中国石油集团石油管工程技术研究院,西安710077

出　　处：《腐蚀与防护》2020年第10期12-17,68,共7页Corrosion & Protection

基　　金：国家科技重大专项(2016ZX05016-003)。

摘　　要：利用电沉积技术在普通N80油管表面制备了镍钨合金镀层,采用扫描电镜、能谱分析、高温高压腐蚀浸泡试验等方法和现场试验,研究了镍钨合金镀层形貌、组成和耐蚀性,以及镍钨合金镀层油管在高矿化度及高含量CO2地层水中的耐腐蚀性能。结果表明:镍钨合金镀层致密均匀,为非晶态结构;在腐蚀浸泡试验中,普通N80油管的腐蚀速率大于0.25 mm/a,而镍钨合金镀层的腐蚀速率小于标准限值(0.076 mm/a),具有较好的耐腐蚀性能;现场服役240 d后,镍钨合金镀层呈银白色金属光泽、表面平整、未见到镀层开裂脱落,点蚀速率为0.028 mm/a,属于轻微腐蚀,N80钢的点蚀速率为0.717 mm/a,是镍钨合金镀层的25.7倍,属于严重腐蚀。非晶态镍钨合金镀层在CO2环境中具有较好的耐均匀腐蚀和点蚀性能。Nickel-tungsten(Ni-W)alloy coating was prepared on the surface of ordinary N80 tubing by electrodeposition technology.The morphology,composition and corrosion resistance of the Ni-W alloy coating in condition of high salinity formation and high carbon dioxide content were studied through corrosion immersion test at high temperature and high pressure,scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and field test.The results show that the Ni-W alloy coating was dense and uniform with an amorphous structure.In corrosion immersion test,the corrosion rate of N80 tubing was beyond 0.25 mm/a,and the corrosion rate of the Ni-W alloy coating was less than the limit of standard(0.076 mm/a),exhibiting better corrosion resistance.After service in field for 240 d,the Ni-W alloy coating was corroded slightly,showing silver-white metallic luster,smooth surface,no cracking or peeling observed on the coating,and the pitting corrosion rate was 0.028 mm/a,while the N80 tubing was corroded heavily with pitting corrosion rate of 0.717 mm/a which was 25.7 times of Ni-W alloy coating corrosion rate.So the amorphous Ni-W alloy coating has good resistance to uniform corrosion and pitting in CO2 environment.

关 键 词：镍钨合金 镀层 CO2腐蚀 监测环 点蚀速率 

分 类 号：TG172[金属学及工艺—金属表面处理]