一种新型材料固井水泥石的抗高CO2分压腐蚀性能评价
Evaluation of resistance to high CO2 partial pressure corrosion of a new material cementing cement stone
刘仕康 1杨威 1王学春 1石礼岗 1山永林 1彭云帆1
作者信息
- 1. 中海油田服务股份有限公司油田化学事业部,河北燕郊 065201
- 折叠
摘要
井下高温、高CO2 含量条件使水泥环长效封固周期寿命缩短,水泥环完整性保障难度增大,由于在较高的压力环境下CO2 呈现低黏度、高扩散性和高压缩性的超临界特性,会加剧水泥石的腐蚀.本文与常见的 6 种防腐材料进行防腐性能对比测试,研发了可用于井下高温、高CO2 分压环境中的一种新型防腐材料.室内实验结果表明,新型火山灰混合材料由于二次水化反应消耗Ca(OH)2 提高水泥石长期强度,且电镜下微观观察分析,新型火山灰混合材料水泥石渗透率更低,CO2 环境中养护 30d后水泥石表面仍存在CaSiO3,表明侵蚀仍在表层进行.新型火山灰混合材料的水泥石具有 30d腐蚀深度 1.17 mm、抗压强度衰退率 2.6%、渗透率变化率 2.1%更好的抗CO2 腐蚀能力,且具有良好的综合施工性能.
Abstract
The high temperature and concentration of CO2 underground conditions shorten the long-term sealing cycle life of the cement sheath,making it more difficult to ensure the integrity of the cement sheath.Due to the supercritical characteristics of low viscosity,high diffusion,and high compressibility of CO2 under high pressure environments,it will exacer-bate the corrosion of the cement stone.This article has developed a new type of anti-corro-sion material that can be used in high-temperature and high CO2 partial pressure environ-ments underground by comparing its anti-corrosion performance with six common anti-cor-rosion materials.The experimental results show that the new volcanic ash mixture material increases the long-term strength of cement stone due to the consumption of Ca(OH)2 in the sec-ondary hydration reaction.Microscopic analysis shows that the anti-corrosion cement stone structure is more dense,and after corrosion,there is still calcium silicate composition on the outside,and corrosion remains on the surface.The cement stone of the new volcanic ash mixture material has better CO2 corrosion resistance with a 30 day decay depth of 1.17 mm,a compressive strength decline rate of 2.6%,and a permeability change rate of 2.1%,and has good comprehensive construction performance.
关键词
高CO2/分压/抗CO2/腐蚀性能/新型火山灰混合材料/高温高压腐蚀测试Key words
high CO2 partial pressure/CO2 corrosion resistance/new volcanic ash mixture materials/high temperature and high pressure corrosion test引用本文复制引用
出版年
2024
NETL
NSTL
万方数据