Non-chloride ion potassium salt water-locking agent for oil well cement, preparation method and application thereof

Belonging to the technical field of oil-gas well cementing additives for the petroleum industry, the invention provides a non-chloride ion potassium salt water-locking agent for oil well cement, a preparation method and application thereof. The non-chloride ion potassium salt water-locking agent is composed of the following materials by mass percentage: 40-60% of a potassium salt, 10-30% of alkali, and 20-40% of sodium silicate, can effectively improve the early strength of cement stone, greatly shortens the well cementing setting waiting time, is free of chlorine ions and other corrosive ions, has no corrosive effect on casing pipes and cement stone, is easy for dry blending, has obvious reinforcing effect on cement slurry, low hydration heat and small influence on the rheological properties of cement slurry, and is conducive to site construction operation. 本发明属于于石油行业用油气井固井添加剂技术领域，提供了种油井水泥用非氯离子钾盐类锁水剂及制备方法和应用，由以下质量百分比的材料组成：钾盐40-60%，碱类10-30%，硅酸钠20-40%，有效提高水泥石早期强度，大大缩短了固井侯凝时间，不含氯离子等腐蚀性离子，对套管和水泥石无腐蚀作用，便于干混，对水泥浆增