锆英石掺量对加砂油井水泥高温性能的影响研究  

Study on influence of zircon content on high temperature performance of sand-containing oil well cement

作　　者：赵峰 曾雪玲 龙丹 古安林 张凌志 王佳 魏雪琦 ZHAO Feng(Jiahua Special Cement Co.LTD.,Leshan 614003,Sichuan,China)

机构地区：[1]嘉华特种水泥股份有限公司,四川乐山614003

出　　处：《水泥》2024年第7期13-18,共6页Cement

基　　金：中国建材集团攻关专项(2021HX0708)。

摘　　要：随着全球能源需求的不断增加,推进了深层、超深层油气资源的开发,固井水泥浆面临的高温高压等恶劣环境也越来越多,而常规的加砂油井水泥已无法满足现有工程要求。本文采用锆英石对加砂油井水泥进行改性,探讨了锆英石对水泥浆体及水泥石高温性能的影响,并通过微观测试对其机理进行分析。结果表明,掺量低于10%时锆英石对于水泥浆性能具有改善作用,与加砂油井水泥体系相比,水泥石高温强度有所提高,渗透率和孔隙度降低,体系高温性能得到增强。微观测试结果表明少量的锆英石能够促进加砂水泥体系水化,提高水泥石强度和耐高温性能;但过量的锆英石阻碍水化产物的生成,使得水泥浆体系性能劣化严重。主要原因是由于少量锆英石不仅可以为水化产物提供结晶点,促进水化产物的形成,还能作为填充材料充填在水化产物之间的孔隙中;而过量锆英石的掺入不仅会发生团聚现象,还会依附在其他物质表面,阻碍水化作用。With the continuous increase of global energy demand,the development of deep and ultra deep oil and gas resources has been promoted,and cementing cement slurry is facing more and more harsh environments such as high temperature and pressure.However,conventional sand-containing oil well cement can’t meet the existing engineering requirements.This article used zircon to modify sand-containing oil well cement,explored the influence of zircon on the high temperature performance of cement slurry and cement stone,and analyzed its mechanism through microscopic testing.The results indicated that zircon has an improvement effect on the performance of cement slurry when the dosage is less than 10%.Compared with the sand-containing oil well cement,the high-temperature strength of cement stone is improved,the permeability and porosity are reduced,and the high-temperature performance of the system is enhanced.The microscopic test results showed that a small amount of zircon can promote the hydration of the sand-containing oil well cement,improve the strength and high temperature resistance of the cement stone,but excessive zircon hinders the generation of hydration products,leading to serious deterioration of the performance of the cement slurry system.The main reason is that a small amount of zircon can not only provide crystallization points for hydration products,promote the formation of hydration products,it can also be used as a filling material to fill the pores between hydration products.On the contrary,excessive addition of zircon not only causes agglomeration,but also adheres to the surface of other substances and hinders hydration.

关 键 词：油井水泥 锆英石 高温 强度衰退 水化产物 

分 类 号：TQ172.75[化学工程—水泥工业] TE256[化学工程—硅酸盐工业]