钻井液与完井液2023，Vol.40Issue(5)：644-651,8.DOI:10.12358/j.issn.1001-5620.2023.05.014
页岩油原位转化工况下微硅复合六偏磷酸钠改性铝酸盐水泥石性能评价
The Performance of Set Aluminate Cement Modified by Micro Silica Compounded Sodium Hexametaphosphate under Condition of Shale Oil In-situ Conversion
摘要
Abstract
In the in-situ conversion of low purity shale oils,extremely high temperature will result in strength retrogression of the set cement.To solve this problem,study was conducted on the macro-properties and microstructures of an aluminate cement before and after aging 650℃.The aluminate cement is a cement modified by micro silica compounded sodium hexametaphosphate.It is found that at 50℃,sodium hexametaphosphate can significantly reduce the permeability of a set aluminate cement,and the compressive strength of the set cement is significantly increased.After treatment at 650℃,the aluminate cement modified with 5.0%sodium hexametaphosphate has the highest compressive strength,which is 47.19 MPa,while the aluminate cement modified with micro silica compounded sodium hexametaphosphate has strengths that are declining.The hydrational products of the aluminate cement before and after treatment at 650℃have experienced significant changes,from C3AH6 and AH3 to C12A7 and CA,respectively.Among these products,C3AH6 and AH3 are thermally degraded in temperatures between 180℃and 400℃,and because of the changes of the crystal form,the permeability of the set cement is increased.Micro silica accelerates the formation of C2ASH8 by the set cement at 50℃,and this is beneficial to the improvement of the microstructure of the set cement.Since C2ASH8 will degrade after treatment at 650℃,the sizes of the pores in the set cement will also increase.关键词
页岩油原位转化/铝酸盐水泥/六偏磷酸钠/微硅粉体/高温处理/水化产物Key words
In-situ conversion of shale oil/Aluminate cement/Sodium hexametaphosphate/Micro silica powder/High temperature treatment/Hydration product分类
能源科技引用本文复制引用
万向臣,张健,王文斌..页岩油原位转化工况下微硅复合六偏磷酸钠改性铝酸盐水泥石性能评价[J].钻井液与完井液,2023,40(5):644-651,8.基金项目
中石油低渗透油气田勘探开发国家工程实验室科技创新项目"含CO2环境下水泥环自修复固井技术研究"(ZCY2022B-05). （ZCY2022B-05）
