油井水泥低温早强剂室内研究

针对低温条件下，水泥浆因水化速度慢，候凝时间长，极易造成油、气、水浸，导致固井质量差和目前油田低温浅层固井可供选择的早强剂种类少的具体情况，根据油井水泥水化及低温早强原理，选择对油井水泥具有低温早强作用的水溶性无氯化工原材料，通过实验优选出无机物A、B，有机盐C和有机酸D，研制出一种新型无氯水溶性低温早强剂ZC-2S，该早强剂对常规密度和低密度水泥浆均有显著的早强作用，且与多种常用油井水泥添加剂体系配伍性好，可用于低温浅层油气井固井水泥浆体系，尤其是无干混装置的油田。

LABORATORY STUDY ON LOW TEMPERATURE EARLY STRENGTH AGENT OF OIL WELL CEMENT SLURRY

As the cement slurry hydration speed is slow and curing time is relatively longer under the condition of low-temperature,it is easy to result in oil,gas and water invasion which leads to poor well cementation quality,and the early strength agent without chloride is lack in cementing of low temperatrue shallow formation.In order to cope with these situations,based on the principles of hydration and low temperature high early strength of cement slurry，the water-soluble chlorine-free chemical raw material，which has the function of low temperature high early strength on cement,is adopted in this research.According to experiment,two kinds of inorganics materials A and B,an organic salt C and an organic acid are selected out and ZC-2S which is a new kind of low temperature early strength accelerator without chloride is developed.ZC-2S can prominently accelerate early strength of general density/low density cement slurry and is of good compatibility with other cement additives.ZC-2S is good early strength accelerator used in low temperature shallow formation and can cement in absence of dry-mixing equipment.