摘要
以丙烯酰胺(AM)、2-甲基-2-丙烯酰胺基丙磺酸(AMPS)为原料,采用反相乳液聚合法制备可分解聚合物微球。微球形貌为不规则球形颗粒,尺寸与油藏的微米/亚微米级孔喉尺寸相匹配,其结构经红外光谱表征。二次成胶实验结果表明,成胶时间随矿化度增加而延长,随温度、聚合物微球加量增大显著缩短。第二交联剂水溶性酚醛溶液(简称FQ)加量对成胶时间影响不大,但对成胶强度影响显著。当温度≥90℃,可分解聚合物微球加量为1.5%~2%(以体系总质量计),第二交联剂FQ加量为1.0%~1.2%(以体系总质量计),得到的二次交联凝胶成胶时间可控,为1~3 d,热稳定性良好,30 d不脱水。在油相中,可分解聚合物微球不发生二次交联,间接证明其具有选择性封堵性。SEM证实了可分解聚合物微球的二次成胶过程,即颗粒间交联形成颗粒聚集体,颗粒聚集体交联形成大的团聚体,最后形成本体胶。
Labile polymer microspheres were prepared by inverse emulsion polymerization by using acrylamide （AM） ,2-methyl-2-acrylic amide propyl sulfonic acid （AMPS）as monomers. The morphology of the labile polymer microspheres is irregular spherical particles, and the microsphere size matches the micro/sub-micro size of pore throat. The structure of the labile polymer microspheres was confirmed by Infrared spectroscopy. The secondary gelling results show that the gelling time extended with the increase of salinity and al^parently shortened with the increase of temperature. The secondary crosslinker FQ （water-soluble phenolic aldehyde ）has little effect on gelling time, but significantly affects the gel strength. The gel with controllable gelling time （about 1 -3 days）, good thermal stability and without dehydration over 30 d can be obtained when the temperature is ≥ 90 ℃, degradable polymer microspheres with an amount of 1.5% ~ 2% and the secondary crosslinker FQ with an amount of 1.0% ~ 1.2%. In the oil phase, the degradable polymer microspheres can＇ t conduct secondary erosslinking, which indirectly proves its plugging selectivity. SEM experiment confirmed the secondary gel process of the degradable polymer microspheres, namely particles crosslinked to form particles aggregate, and then particle aggregates erosslinked to form large aggregate and finally to form bulk gel.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2015年第8期926-930,共5页
Fine Chemicals
基金
国家科技重大专项专题(2011ZX05049-004-004)~~
关键词
可分解聚合物微球
反相乳液聚合
二次成胶
提高采收率
油田化学品与油品添加剂
labile polymer microspheres
inverse emulsion polymerization
secondary crosslinking
enhanced oil recovery
oil-field chemicals and petroleum additives
