一种油井水泥用抗分散絮凝剂

A Dispersion Resistant Flocculant used in Oil Well Cement Slurry

国内油田注水区块频发的水侵,严重地破坏了水泥石强度和胶结质量。针对该问题,采用自由基聚合的方式合成出一种适用于油井水泥的抗分散絮凝剂BCY-100S。通过Zeta电位分析和热重分析测定了BCY-100S的絮凝性和耐热性,并评价了其对水泥浆抗水侵性能的作用和稠化性能。结果表明,BCY-100S耐温可达324℃,加入BCY-100S的水泥浆具备一定絮凝性,能够在80℃下,受到水的冲刷作用而不离析、不分散,与未加入BCY-100S的普通水泥浆相比,具有显著的抗水冲刷性能。除此之外,抗分散絮凝剂BCY-100S对稠化时间无影响,符合油井水泥性能要求。为各油田解决地层流体对水泥浆"溶解迁移"和"质量互换"的问题提供了一种新的方法。

Frequent water invasion in water injection blocks in China gravely undermine the strength and bonding quality of set cement.A dispersion resistant flocculant BCY-100S has been developed to deal with these problems.BCY-100S is produced through radical polymerization and is used in preparing cement slurries for oil well cementing.The flocculating capacity and heat resistance of BCY-100S were measured through zeta-potential analysis and TGA.The effects of BCY-100S on the performance of cement slurry to resist water invasion and on the thickening property of cement slurry were tested.It was foxind that BCY-100S functions normally at temperatures up to324℃.Cement slurries treated with BCY-100S have to some flocculating ability.The BCY-100S treated cement slurries did not disperse or segregate when flushed with water at80℃.Compared with cement slurries that were not treated with BCY-100S,the cement slmries treated with BCY-100S were able to resist water flooding.BCY-100S does not affect the thickening time of cement slurry,which is a requirement of oil well cement property.Considering the effects of formation fluids on set cement,such as"migration after dissolution"and"mass interchange",the use of BCY-100S has provided a new method of resolving these problems.