接枝型 AMPS共聚物降失水剂的合成与性能评价

Synthesis and Performance Evaluation of Graft AMPS Copolymer as Fluid Loss Additive

雒春辉 邹建龙 徐 鹏 许涌深

LUO Chunhui ZOU Jianlong XU Peng XU Yongshen

为提高 2-丙烯酰胺基-2-甲基丙磺酸（AMPS）共聚物的热稳定性和水泥浆的高温性能， 以腐植酸为底物接枝混合单体 AMPS、 丙烯酰胺（AM）、 N， N-二甲基丙烯酰胺（DMAM）和丙烯酸（AA）， 合成了一种降失水剂 GP。采用凝胶渗透色谱 （GPC）、 红外光谱 （FT-IR） 以及热重分析 （TGA） 对 GP的结构进行了表征， 研究了温度对 GP水溶液黏度的影响， 并对其在水泥浆中的综合性能进行了评价。研究结果表明， GP为接枝型共聚物， 分解温度为282℃； GP溶液黏度随着温度升高而降低， 其在不同温度下的相对黏度均高于线性聚合物 LP， 90℃下 GP溶液的黏度是室温黏度的66.3%， 高出 LP 17.6%； GP具有优异的控失水能力， 耐盐可达饱和； GP水泥浆在室温下的黏度低于 LP水泥浆， 当温度从 30℃升至 150℃时， GP水泥浆体系黏度保持率为 60.7%， 比 LP体系高 15.8%； GP与其他外加剂配伍性好， 对水泥浆稠化时间和抗压强度的影响较小； GP水泥浆在 50℃下养护 48 h的抗压强度为 22.7MPa， 与 LP相当， 超声波检测结果表明 GP水泥浆强度发展正常， 静胶凝强度过渡时间比 LP水泥浆短 17%， 有利于防止水泥浆固化期间的气窜。图 8表 1参 16

In order to improve the thermo-stability of 2-acrylamido-2-methyl-propane sulfonic acid （AMPS） copolymer and enhance the performance of cement slurry at high temperature，a fluid loss additive，shorted as GP，was synthesized by grafting mixed monomers of AMPS，acrylamide（AM），N， N-dimethylacrylamide（DMAM）and acrylic acid（AA）onto humic acid. The structure of GP was characterized with FT-IR spectroscopy，gel permeation chromatography（GPC）as well as thermogravimetric analysis（TGA） . The effect of temperature on the viscosity of GP solution was studied，and its performance in cement slurry was evaluated at lab scale. The research results showed that the GP was a graft copolymer with a thermal-decomposition temperature of 282℃. Although the viscosity of GP aqueous solution decreased with increasing temperature，its relative viscosities at different temperatures were higher than that of linear polymer LP solution. Compared with their initial values at room temperature，the viscosity retention of GP solution at 90℃ was 66.3%，which was 17.6% higher than that of LP solution. GP had excellent fluid loss control ability and salt-tolerance. The viscosity of cement slurry containing GP（CSG）at room temperature was lower than that of cement slurry containing LP. Moreover，when CSG was heated from 30 to 150℃，its viscosity retention maintained 60.7%，which was 15.8% higher than that of LP cement slurry. GP also exhibited well compatibility with other additives and ignorable effect on the thickening time and compressive strength. The compressive strength of CSG after setting at 50℃ for 48 h was 22.7 MPa，similar to that of LP cement slurry. Ultrasonic experiment revealed that the compressive strength of CSG developed normally. The transition time of static gel strength was 17% shorter than that of LP system，which was benefit to prevent the gas migration during solidifying period of cement slurry.

10.19346./j.cnki.1000-4092.2017.01.003