摘要
聚乙烯醇-环氧氯丙烷交联聚合物交联时间短,在温度为130℃、矿化度为22×10^4mg/L的环境下脱水率高、黏弹性差。通过在交联过程中加入2-丙烯酰胺-2-甲基丙磺酸(AMPS)含量不同的丙烯酰胺(AM)-AMPS共聚物以及不同颗粒增韧剂对交联聚合物进行改性。通过测定交联时间、脱水率和储能模量,对交联聚合物制备条件进行了优选,评价了交联聚合物的稳定性和封堵性。结果表明,聚乙烯醇-环氧氯丙烷交联聚合物的最佳制备条件为:8%聚乙烯醇、4%环氧氯丙烷、1%AM-AMPS共聚物(AMPS>70%)、3%黏土,反应温度30℃。改性后的交联聚合物交联时间在1数2 h可调,储能模量大于2000 Pa;在温度为130℃、矿化度为22×10^4 mg/L的条件下具有低脱水率和较好的黏弹性,在盐水中浸泡90 d的脱水率小于10%,黏弹系数为0.07。交联聚合物颗粒对裂缝的封堵效果良好,封堵率可达92.61%;颗粒尺寸与最小孔喉直径的比值介于1到2时,封堵效果最好。改性聚乙烯醇-环氧氯丙烷交联聚合物交联时间可控,耐温耐矿化度能力强,黏弹性好,可用于高温高矿化度的裂缝、溶洞以及大孔道的封堵。
The polyvinyl alcohol-epichlorohydrin crosslinked polymer has a problem that the gelation time is short. And the dehydration rate is high and the viscoelasticity is poor under the condition of 130℃ and 22 × 10^4 mg/L salinity. The crosslinked polymer was modified by adding acrylamide(AM)-2-acrylamide-2-methylpropanesulfonic acid(AMPS)copolymer with different content of AMPS during crosslinking. By measuring the crosslinking time,dehydration rate and energy storage modulus,the preparation condition of the crosslinked polymer was optimized,and the stability and plugging ability of the crosslinked polymer were evaluated. The results showed that the best preparation condition of polyvinyl alcohol-epichlorohydrin crosslinked polymer was obtained as follows:8% polyvinyl alcohol,4% epichlorohydrin,1% AM-AMPS copolymer(AMPS > 70%),3% clay,and30℃ reaction temperature. The crosslinking time of the modified crosslinked polymer was adjustable in 1-2 h,and the energy storage modulus was greater than 2000 Pa. Under the condition of 130℃ and 22×10~4 mg/L salinity,it had low dehydration rate and good viscoelasticity. The dehydration rate was less than 10% after polymer was soaked in brine for 90 days,and the viscoelastic coefficient was 0.07. Crosslinked polymer particle had good sealing effect on the crack,and the sealing rate could reach 92.61%.When the ratio of particle size to minimum pore throat diameter was between 1 and 2,the sealing effect of polymer particle was the best. The modified polyvinyl alcohol-epichlorohydrin crosslinked polymer had controllable crosslinking time,strong resistance to temperature and salinity and good viscoelasticity,which could be used for sealing cracks,caves and large channels with high temperature and salinity.
作者
张宇豪
张贵才
葛际江
徐元德
ZHANG Yuhao;ZHANG Guicai;GE Jijiang;XU Yuande(College of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266555,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2020年第1期45-51,共7页
Oilfield Chemistry
