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Synthesis and performance of itaconic acid/acrylamide/sodium styrene sulfonate as a self-adapting retarder for oil well cement

机译：衣康酸/丙烯酰胺/苯乙烯磺酸钠作为油井水泥的自适应缓凝剂的合成及性能

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摘要

A novel self-adapting retarder itaconic acid/acrylamide/sodium styrene sulfonate (IA/AM/SSS, hereinafter referred to as PIAS) was synthesized by free-radical, aqueous-solution polymerization and characterized by FTIR and TG. The optimum reaction conditions of polymerization were obtained from orthogonal experiments (L3(3)) and subsequent data analysis. According to the evaluation as a retarder, the PIAS made it possible to obtain both a long thickening time and a swift compressive strength development for cement slurry, and therefore the applicable range of bottom hole circulation temperatures to the cement slurry has been widened to 60-180 degrees C. Moreover, the working mechanism of the self-adapting retarder PIAS was found to rely on the change of spatial structure of the molecules to retard the hydration of the cement. This paper also expounds that the delayed coagulation of the cement slurry is attributed to adsorption, chelation and "poisoning" effects of the PIAS molecules on the surface of hydrated particles or ions through XRD and SEM analyses.
机译：通过自由基水溶液聚合反应，合成了一种新型的自适应缓凝剂衣康酸/丙烯酰胺/苯乙烯磺酸钠（IA / AM / SSS，以下简称PIAS），并通过FTIR和TG进行了表征。聚合反应的最佳反应条件是通过正交试验（L3（3））和随后的数据分析获得的。根据作为缓凝剂的评估，PIAS使得水泥浆可以获得较长的增稠时间和快速的抗压强度，因此，井底循环温度对水泥浆的适用范围已扩大到60- 180摄氏度。此外，发现自适应阻滞剂PIAS的工作机理依赖于分子空间结构的变化来阻滞水泥的水合作用。本文还阐述了水泥浆的延迟凝结归因于通过XRD和SEM分析，PIAS分子在水合颗粒或离子表面上的吸附，螯合和“中毒”作用。

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