摘要
土热水的矿化度非常高,单纯沿用油气装备是否能满足地热水开采要求尚不可知。鉴于此,选取不同腐蚀强度的地热井作为模拟工况,采用挂片方式进行试验模拟,研究J55石油套管在不同地热水中的腐蚀行为,并探讨其腐蚀规律及机理。研究结果表明:J55石油套管在地热水中的腐蚀速率较高,均匀腐蚀速率在0.5 mm/a以上,属于极严重腐蚀,如果在地热开采过程中长期使用极易出现套管穿孔或断裂事故;腐蚀产物以FeCO_3为主,在1号工况下材料表面形成了CaCO_3垢层,CaCO_3垢层对腐蚀起到了抑制作用,但是垢层存在明显的空隙,极易发生局部腐蚀现象。由此可见,J55石油套管不能满足地热水开发要求。
The conditions of geothermal wells with different corrosion are selected as the simulation conditions and the coupons are used for testing to study the corrosion behavior of J55 casing in different geothermal water. The corrosion rule and mechanism are also discussed. The results show that the corrosion rate of J55 casing in geothermal water is high with the uniform corrosion rate above 0？ 5 mm/a ,which is a very serious corrosion easy to cause casing perforation or casing fracture during long-term geothermal exploitation. The corrosion products are dominated by FeC03. CaC03 scale is formed on the surface of the material under the No. 1 condition, which inhibits the corro-sion. However, the CaC03 scale had obvious voids which could easily lead to localized corrosion. Thus, J55 casing cannot meet the needs of geothermal water development.
出处
《石油机械》
2017年第12期106-110,共5页
China Petroleum Machinery
基金
中石化石油工程机械有限公司项目"地热管材低成本替代化方案研究"
作者简介
周远喆,工程师,生于1987年,2009年毕业于中国石油大学（北京）材料科学与工程专业,现从事金属材料腐蚀与防护的研究工作.地址：（430223）湖北省武汉市.电话：（027）52307628.E-mail：zhouyz.oset@sinopec.com
