地热井固井水泥石传热性能研究现状及展望

Research status and prospect of thermal transfer performance of cement in geothermal wells

固井水泥石传热性能是影响井筒热传递能力的重要因素。本文主要介绍了目前固井水泥石导热系数的主要研究手段,以及在此基础上取得的一些认识,例如外加高导热材料、水泥石微观结构和含水率与导热系数之间的关系。同时还指出了现有研究手段的统一和拓展、研究内容的系统化还有待进一步加强和改善。在分析建筑保温水泥和岩石等多孔材料研究经验的基础上,提出水泥石导热系数的研究不仅需要统一实验手段和推广使用数值模拟的方法,还要考虑水泥石养护条件、内部水分的动态变化和外加保温材料等因素对水泥石导热系数的影响。系统规范的研究手段和内容可有效提高研究的准确性、高效性和全面性,显著增加对水泥石热传导性能的认识,以期为后续的研究提供一定的借鉴。

The heat transfer performance of cement is an important factor that affects the heat transfer capacity of the wellbore.This article mainly introduces the current main research methods of cement thermal conductivity,and some understandings obtained from the research,such as the relationship between the addition of high thermal conductivity materials,the cement microstructure and water content,and thermal conductivity.At the same time,it points out that the unification and expansion of the existing research methods and the systematization of research content need to be further strengthened and improved.Based on the analysis of the research experience on porous materials such as building thermal insulation cement and rock,it is proposed that the research on the thermal conductivity of cement not only needs to unify the experimental methods and promote the use of numerical simulation methods,but also consider the curing conditions,the dynamic changes of internal moisture and the influence of external thermal insulation materials,and other factors on cement thermal conductivity.The systematic and standardized research methods and content can effectively improve the accuracy,efficiency and comprehensiveness of the research,and significantly increase the understanding of the thermal conductivity of cement so as to provide a certain reference for subsequent research.