The effect of the rock type on the degradation of well cements in CO2 enriched geothermal environments
The effect of the rock type on the degradation of well cements in CO2 enriched geothermal environments
复制标题
富CO2地热环境中岩石类型对井水泥降解的影响
DOI：
10.1016/j.geothermics.2018.06.002
复制
发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
N. Milestone
中科院分区：
文献类型：
--
作者：
João Conde Silva;N. Milestone
在地热环境下的井中，岩石类型在水泥最外层与地层相互作用的方式中起着关键作用。水泥对岩石的渗透程度受岩石的孔隙率控制，岩石的孔隙率也调节可以接触水泥的富二氧化碳盐水的量。通过在岩石块上钻孔、倒入水泥浆并在典型地热环境下在 150°C 下对整个组件进行水热处理来制备样品。检查了地热水泥和火山岩之间形成的界面过渡区 (ITZ) 的变化。岩石的孔隙度和火山玻璃含量对水泥和地层相互作用的方式有相当大的影响，并最终影响这些材料之间的结合。孔隙率对水泥在碳酸盐水中的耐久性有重大影响。
The rock type plays a key role in the way in which the outermost layer of the cement interacts with the formation, in wells under geothermal environments. The penetration of cement into the rock is controlled by the porosity of the rock which also regulates the amount of CO2enriched brine that can contact the cement.Samples were prepared by drilling holes into rock blocks, pouring in a cement slurry and hydrothermally treating the whole assembly at 150 °C under typical geothermal environments. The changes in the interfacial transition zone (ITZ) that forms between geothermal cements and volcanic rocks were examined.Both porosity and the volcanic glass content of the rock have a considerable impact on the way in which the cement and the formation interact and, ultimately, affect the bond between these materials. The porosity has a major influence on the durability of the cement in carbonated brine.