丁苯胶乳(SBRL)的改性和胶乳水泥抗腐蚀性能

The Study on the Modification of Styrene- Butadiene Rubber Latex(SBRL)and Corrosion Resistance Properties of Latex Cement

如何提高水泥石抗CO2腐蚀的能力,日益受到各油田的高度重视,并成为了含CO2地层油气开发生产中急待解决的问题。本文通过加入表面活性剂复配体系,解决胶乳在高钙离子浓度的影响下产生的破乳现象,通过加入无机物、酸酐和多元醇反应生成树枝型网状结构,改善胶乳水泥浆的稳定性。胶乳水泥浆体系的稠化时间通过常压稠化仪进行测定。同时,对胶乳水泥浆体系水泥石进行了高温高压抗CO2评价。结果表明:文中采用的改性方法效果良好,胶乳和水泥的复配体系高温稳定性良好,在90℃条件下,可以满足固井施工要求。同时改性后的胶乳水泥石高温、高压抗CO2腐蚀性能有了明显的提高。

The problem on how to improve the ability of carbondioxide erosion resistance of the cement, increasingly attaches great importance to the oil.fleld, and became emergency one needed to be solved in the development and production of oil and gas containing carbon dioxide. In this paper, the stratagem of adding surfactant compound system was utilized to solve the problem on demulsification phenomenon under high calcium ion concentration. Because adding inorganic, acid anhydride and polyols and generating structure of branch type network can improve the stability of latex cement. Thickening time of latex cement slurry system was measured by atmospheric thickening instrument. At the same time, the latex cement slurry system was characterized under high temperature and high pressure resistance of CO2. The results show that after modification the latex and cement present good abilities. The stability of latex and cement compound system under high temperature was improved that means they can meet the requirements of cementing operation under 90℃. Moreover the CO2 corrosion resistance of modified latex cement under high temperature and high pressure has been obvious improved.