MOPBG-AMPS共聚物阻垢剂的合成及硫酸钡阻垢性能评价

以水为溶剂,过硫酸铵为引发剂,以2-(N,N-二亚甲基羧基)胺甲基-丙烯酰胺基二乙酸(MOPBG)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为单体,制备了一种针对油气田使用的新型共聚物阻垢剂。通过红外光谱和热重分析测定了共聚物的结构和不同配比共聚物的热稳定性能;采用静态阻垢法研究了共聚物浓度对硫酸钡阻垢率的影响。结果表明:单体配比为n(MOPBG)∶n(AMPS)=3∶(1.5～2)时,共聚物具有最佳的耐热性能。阻垢效果最优共聚物添加量分别为:共聚物n(MOPBG)∶n(AMPS)=3∶1.5]为20 mg/L,阻垢率为98.9%;共聚物n(MOPBG)∶n(AMPS)=3∶2]为15 mg/L,阻垢率为96.4%。利用扫描电子显微镜,探讨了共聚物的阻垢机理。

Synthesis of MOPBG-AMPS copolymer and evaluation of inhibition of barium sulfate scale

A water-soluble MOPBG-AMPS scale inhibition agent was prepared from N,N-(2-methylene-1-oxo-1,3-propanediyl)-bis-glycine(MOPBG) and 2-acrylamido-2-methyl propane sulfonic acid(AMPS) in aqueous solution using persulfate as initiator.The structure and thermal stability of the copolymer was characterized by FTIR and TGA.Using the static experiment method,the inhibition of BaSO4 scale was studied.The results showed that the copolymer n(MOPBG)∶ n(AMPS)=3∶(1.5—2)] showed the best heat resistance.As an excellent scale inhibitor,the inhibition capability of copolymer n(MOPBG)∶n(AMPS)=3∶1.5] reached 98.9% at the dose of 20 mg/L,the inhibition capability of copolymer n(MOPBG)∶n(AMPS)=3∶2] reached 96.4% at the dose of 15 mg/L.Formation of BaSO4 crystals was determined by SEM,and the mechanism of scale inhibition was discussed.