一种海洋深水超低温早强剂的研究  

A Study for a Ultra-low Temperature of Early Strength Agent in Deepwater

作　　者：朱江林 石礼岗 方国伟 冯克满 凌伟汉 宋茂林 范鹏 

机构地区：[1]中海油服油田化学研究院,北京101149 [2]中海油服油田化学事业部深圳基地,广东深圳518054

出　　处：《长江大学学报（自然科学版）》2011年第5期68-70,7,共3页Journal of Yangtze University(Natural Science Edition)

摘　　要：研究了一种深水固井用低温早强剂。该早强剂主要由固体PC-DA21S与液体PC-DA21L两部分组成,在满足稠化时间的同时,在低温10℃情况下14h形成支撑套管的3.5 MPa强度,24h达到6.9 MPa,3d水泥块强度达到19.6 MPa的高强度,甚至在低温3℃时也表现出较好的早强效果。该早强剂增稠现象不明显,水溶性好,也不含氯离子,有利于保护油井套管;且价格低廉,材料来源广泛,对环境无污染,可以满足未来500～2000 m水深的表层固井及技术套管固井作业需求。Because of the low-temperature of deepwater,the hydration velocity of normal 'G' grade oil well cement hydration is slow or almost zero at low temperature of 10℃ or lower,and the early intensity of cement is low and unable form an effective strength in 8hr or 24h,which cause the cementing can't proceed smoothly.The author aims to provide a low temperature early strength agent PC-DA21S(L),it is used in deep water cementing,which is mainly composed of organic materials and inorganic materials.PC-DA21S(L) can satisfy the requirements of thickening time,meanwhile,it can guarantee that at 10℃,the cement strength is 3.5MPa of 10hr which can support the casing,6.9MPa of 24 hours,and even 19.6MPa at 3 days.The early strength is also excellent at 3℃.The water-soluble early strength agent PC-DA21S(L),which contains no chloride ion and doesn't cause thickening agent,can help protect the well casing.And it's low cost,extensive material source and no pollution to environment.The early strength agent can fulfill the requirement of surface casing cementing between 500～2000 meters.

关 键 词：深水 表层固井 低温 早强剂 抗压强度 “G”级水泥 

分 类 号：TE256.6[石油与天然气工程—油气井工程]