Development of An Epoxy Phosphate Retarder and A High Temperature Cement Slurry Resistant to 220 °C
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摘要: 针对油井水泥常用缓凝剂在200 ℃以上稠化时间不稳定问题，笔者以官能团和聚合物功能结构为基础，对抗高温缓凝剂进行分子结构设计。以AMPS、SAS、NVP、AM和环氧丙基磷酸5种单体制备了一种五元抗高温缓凝剂NPAAS-1。采用红外光谱、热重分析以及核磁共振H谱对NPAAS-1进行表征。结果表明，缓凝剂NPAAS-1为预期产物，300 ℃时失重仅为22.30%。通过其性能评价可知，NPAAS-1在200 ℃以上具有很好的缓凝性能，且稠化时间与加量呈线性关系。在 220 ℃下，缓凝剂加量为3.5%时，稠化时间为297 min；加量为4.5%时，稠化时间为530 min。可以实现对超高温环境下水泥水化速率的有效控制。Abstract: In designing the molecular structures of cement slurry retarders, monomers with the target groups are selected to produce retarders which can control the thickening time of oil well cement slurries at stable values at temperatures above 200 °C. The molecular structure is designed on the basis of functional structure of the polymers. A high temperature penta-polymer retarder NPAAS-1 is developed based on the molecular structure design clue with five monomers, which are AMPS, SAS, NVP, AM and epoxypropyl phosphate. Characterization of the molecular structure of NPAAS-1 shows that the final product is the expected product. Weight loss on heating of NPAAS-1 at 300 °C is only 22.30%. NPASS-1 has good retarding capacity at temperatures above 200 °C, and the thickening time of the cement slurry is in a linear relationship with the concentration of NPSSA-1. A cement slurry of moderate density working normally at 220 °C was formulated with NPAAS-1 as the retarder, HTFLA-A as the filter loss reducer, HTDA-6 as the dispersant and HTSA-2 as the suspending agent. At concentration of 3.5% NPAAS-1, the thickening time of the cement slurry is 297 min; while at concentration of 4.5%, the thickening time becomes 530 min. Using this retarder NPAAS-1, the hydration speed of cement can be effectively controlled at ultra-high temperatures.
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