含磺酸基硫酸钡防垢剂的制备与性能评价

Synthesis and Performance Evaluation of BaSO4Scale Inhibitor with Sulfonic Acid Group

樊家铖 曲占庆 齐 宁 孙 逊 张翔宇

FAN Jiacheng，QU Zhanqing，QI Ning，SUN Xun，ZHANG Xiangyu

为防止油田开发过程中硫酸钡垢的形成、提高防垢剂的耐温性和耐盐性，从防垢功能基团以及有机物相对分子质量两方面考虑，选取丙烯酸（AA）、顺丁烯二酸酐（MA）、2-丙烯酰氨基-2-甲基丙磺酸（AMPS）和甲基丙烯酸（MMA）为原料，以过硫酸铵为引发剂，采用水溶液聚合法合成了硫酸钡防垢剂，对原料配比进行了优化，研究了防垢剂加量、温度、pH值对防垢率的影响及防垢剂与地层水的配伍性。结果表明，当AA、MA、AMPS和MMA占总反应物质量比分别为30%、52.5%、5%和12.5%，过硫酸铵用量为反应单体总量的1.5%时，制得的硫酸钡防垢剂相对分子质量接近9640.69，产物纯度为62.3%。在50℃的集输管线温度下，防垢剂在加量高于12.5 mg/L时即有优良的硫酸钡防垢效果，加量为100 mg/L时的防垢率可达85%以上。防垢剂在弱碱性环境中有较好的防垢效果。防垢剂耐温性良好，在低浓度下能有效防止硫酸钡晶体的生长和附着。防垢剂与地层水的配伍性良好，与含有多种阳离子的模拟地层水在50℃下混合静置24 h无沉淀生成，满足油田使用要求。图6表4参16

n order to prevent the formation of barium sulfate scale in the process of oilfield development and improve the temperature resistance and salt resistance of anti-scaling agent，by considering anti scaling functional group and relative molecular weight of organic matter，a new BaSO4 scale inhibitor was prepared through aqueous solution polymerization by using acrylic acid（AA），maleic anhydride（MA），2-acrylamino-2-methylpropanesulfonic acid（AMPS）and methyl methacrylate（MMA）as reaction monomer，and（NH4）2S2O8 as initiator. The proportion of raw materials was optimized，and the effects of temperature，dosage and pH value of scale inhibitor on scale prevention rate and the compatibility of scale inhibitor with formation water were studied. The results showed that when the optimal dosage of reaction monomer AA，MA，MAA，AMPS was 30%，52.5%，5%，12.5% and the dosage of（NH4）2S2O8 was 1.5% in terms of total amount of monomer，the molecular weight of the scale inhibitor was close to 9640.69，and the purity of the product was 62.3%. At the gathering and transportation pipeline temperature of 50℃，when the dosage of scale inhibitor was higher than 12.5 mg/L，it had excellent anti-scaling effect of barium sulfate. When the dosage was 100 mg/L，the scale prevention rate could reach more than 85%. The scale inhibitor had a good anti-scale effect in weak alkaline environment.The scale inhibitor had good temperature resistance and could effectively prevent the growth and adhesion of barium sulfate crystal at low concentration. The compatibility of scale inhibitor and formation water was good. The mixture of scale inhibitor and simulated formation water containing various cations could be kept at 50℃ for 24 hrs without precipitation，meeting the requirements of oilfield.

10.19346/j.cnki.1000-4092.2019.04.030