Synthesis and Performance Evaluation of High Temperature Oil Well Cement Retarder ZRT-1
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摘要: 针对水溶性聚合物在水泥浆中耐高温性能的局限性，笔者突破传统水溶性共聚物的研究思路，设计了无机非金属材料-有机聚合物高温缓凝剂ZRT-1，通过正交实验法及单因素法确定了ZRT-1的最佳合成工艺，AMPS：IA：AA的物质的量比为7.0：1.5：1.5，偶联剂加量为0.5%，无机材料加量为1%，引发剂加量为1.5%，单体质量分数为30%，pH值为4，反应温度为65℃，反应时间为8 h ；分别采用红外光谱（FT-IR），热重分析（DSC/DTG）、凝胶渗透色谱（GPC）等对ZRT-1进行了表征。结果显示，ZRT-1具有预期结构和官能团，热稳定性好，重均分子量为10 091，数均分子量为2020，分子量分布为4.99 ；对ZRT-1的性能评价结果表明,水泥浆稠化时间随ZRT-1加量的增加呈线性增加，随着温度的升高也呈线性降低，具有加量和温度可调性；ZRT-1加量为0.4%～1.5%时，水泥浆在114～230℃、54～90 MPa时的稠化时间在200～400 min之间可调，稠化曲线平稳，过渡时间短且呈直角稠化。Abstract: A high temperature retarder ZRT-1 was synthesized with a nonmetallic material and an organic polymer. The development of ZRT-1 is to overcome the high temperature stability limitation of water soluble polymers used in cement slurries. The optimum synthesis process was determined using orthogonal test and single factor method; the molar ratio of the monomers was: AMPS：IA：AA = 7.0：1.5：1.5. The concentrations of the coupling agent, the inorganic material and the initiator were 0.5%, 1% and 1.5%. The mass fraction of the monomers was 30%. The pH of the reaction was 4, the reaction temperature 65 ℃, and the reaction time 8 h. Characterization of the synthetic product by FT-IR, DSC/DTG and GPC showed that ZRT-1 had the molecular structure and functional groups required. The molecular structure and functional groups render ZRT-1 good thermal stability. ZRT-1 had a weight average molecular weight (Mw) of 10091, a number average molecular weight (Mn) of 2020, and a molecular weight distribution of 4.99. Evaluation of ZRT-1 showed that the thickening time of a cement slurry linearly increased the concentration of ZRT-1, and linearly decreased with temperature. A cement slurry treated with 0.4%-1.5% ZRT-1 had a thickening time between 200 min and 400 min at 114-230 ℃/54-90 MPa, and the thickening curve changed smoothly. The cement slurry also showed short transition time and rightangled thickening curve.
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