摘要
针对大温差条件下固井水泥浆在固井过程中可能存在的悬浮失稳问题,本研究采用水溶液自由基聚合法合成具有疏水缔合结构的聚合物作为悬浮稳定剂(PAAN)。通过红外光谱仪、凝胶渗透色谱仪、热重分析仪、高温流变仪、SEM和紫外分光光度计等表征PAAN的结构,结果表明PAAN随温度升高会形成分子间疏水缔合网状结构,保证了体系的粘度,起到了有效的悬浮稳定作用。在40~110℃下,0.6%加量的PAAN可以保证固化后的水泥石柱顶部和底部密度差<0.01 g/cm^(3),且水泥浆稠化时间基本不变,表明PAAN可以保证水泥浆体系具有良好的悬浮稳定效果,且对水泥浆的其他性能无不良影响。
To solve the problem of suspension instability of cementing slurry under the condition of large temperature difference, this study used aqueous solution free radical polymerization to synthesize polymers with hydrophobic association structure as suspension stabilizer(PAAN). The structure of PAAN was characterized by an infrared spectrometer, gel permeation chromatography, thermogravimetric analyzer, high-temperature rheometer, SEM, and UV spectrophotometer. It was found that PAAN formed an intermolecular hydrophobic association network structure with the increase in temperature, which ensured the viscosity of the system. Thus, it played an effective suspension and stability role. It was found that the density difference between the top and bottom of the solidified cement column was less than 0.01 g/cm^(3) at the temperature of 40~110 ℃ with 0.6% PAAN addition, and the thickening time of the cement slurry was unchanged, indicating that PAAN could guarantee the suspension stability of cement slurry system, and had no adverse effect on other properties of cement slurry.
作者
赵金丰
周晋宇
张健
ZHAO Jinfeng;ZHOU Jinyu;ZHANG Jian(Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co.,Ltd.,Xi’an 710018,China)
出处
《合成化学》
CAS
2022年第11期861-869,共9页
Chinese Journal of Synthetic Chemistry
基金
低密度水泥浆固井用大温差悬浮稳定剂研发项目(CQXN-2021-06)。
关键词
固井水泥浆
悬浮稳定性
大温差
疏水缔合
稠度
cementing cement slurry
suspension stability
large temperature difference
hydrophobic association
consistency
