抗盐降失水剂HTF-110L 的研制及性能评价
Synthesis and Properties Evaluation of Salt Resistant Fluid Loss Additive HTF-110L

针对目前固井降失水剂所存在的抗高温抗盐能力差、温度适应范围窄的问题，以2-丙烯酰胺基-2-甲基丙磺 酸(AMPS)、丙烯酰胺(AM)、丙烯酸(AA)为主要单体，并引入新型多羟基羧酸化合物，采用自由基水溶液共聚合 成了抗温、抗盐、温度适应范围广的降失水剂HTF-110L．采用正交实验法，优选出了最佳合成工艺条件．采用红 外光谱、核磁共振和热失重分析对共聚物进行了表征．结果表明：各单体成功参与聚合，聚合产物为目标产物，降 失水剂耐温性能良好；由于在共聚物分子链中引入了多种功能性基团，合成的降失水剂在淡水、盐水水泥浆中具有 良好的降失水性能；降失水剂分散性弱，在高温条件下对水泥浆的稳定性影响较小，低温条件下缓凝性弱，对水泥 石强度发展无不良影响，具有较宽的温度适用范围；降失水剂与其他油井水泥外加剂配伍性好，以HTF-110L 为主 剂的低密度、高密度水泥浆体系具有失水量小、流变性好、稳定性佳、过渡时间短、抗压强度高等特点，综合性能 优异．
The currently used cement fluid loss additive has the problems of weak salt tolerance，poor thermal stability and narrow range of temperature adaptation. To solve the problems，a novel high temperature-resistant，salttolerant and wide-range-of-temperature-applied fluid loss additive HTF-110L was synthesized by using the monomers of 2-acrylamido-2-methylpropane sulfonic acid(AMPS)，acrylamide(AM)，acrylic acid(AA)and poly-hydroxyls carboxylic acid with the method of aqueous solution polymerization. Optimal synthesizing process conditions of HTF- 110L were extracted by orthogonal experiment. The synthetic fluid loss additive was characterized by Fourier transform infrared spectroscopy，proton nuclear magnetic resonance spectroscopy and thermogravimetric analysis. The analysis results reveal that the polymer is the target product polymerized by all the monomers and has great thermal stability. The synthetic fluid loss additive has great fluid loss control performance in fresh-water slurry and salinewater slurry owing to its main chain composing of functional groups．It also presents weak dispersivity and less effect on high temperature stability，and shows weak retarding performance and less effect on the growth of cement strength under low temperature，thus having a wide temperature application range. The fluid loss additive has good compatibility with other oil well cement additives. Both low density cement slurry and high density cement slurry mixed mainly with HTF-110L have good comprehensive properties，such as low fluid loss，good rheological properties， excellent stability，short transition time，high compressive strength，etc