School of Energy Resources, China University of Geosciences, 29 Xueyuan Road, Beijing, 100083, China.
Research Institute of Petroleum Exploration and Development, SINOPEC, 31 Xueyuan Road, Beijing, 100083, China.
Sci Rep. 2017 Aug 18;7(1):8791. doi: 10.1038/s41598-017-09057-9.
In a previous study, we developed a synthetic hydrophobically modified hydroxyethyl cellulose (HEC) using bromododecane (BD), which we denote as BD-HMHEC. In this work, we continually investigate the rheological properties and its oil displacement efficiency in PuTao well area in Daqing oilfields, China. Results show that BD-HMHEC solution has good viscosification, thermal-resistance, salt-tolerance, shear resistance, and acid/alkali resistance. The storage modulus (G') and the loose modulus (G") of the BD-HMHEC solutions increase significantly with increasing BD-HMHEC concentration, and the solution becomes viscoelastic at a sufficiently high BD-HMHEC concentration. The core flooding results showed BD-HMHEC flooding improves oil recovery by 7-14% in comparison with HEC flooding at concentrations of 4,000 mg/L under equivalent conditions. Moreover, BD-HMHEC flooding improves oil recovery by 7-8% after conducting water and hydrolyzed polyacrylamide (HPAM) flooding. The oil displacement mechanism of BD-HMHEC solutions is discussed based on a visual evaluation. The results indicate that BD-HMHEC flooding is a feasible means for improving oil recovery after water/HPAM flooding.
在之前的研究中，我们使用溴代十二烷（BD）合成了一种疏水改性羟乙基纤维素（HEC），我们将其命名为 BD-HMHEC。在这项工作中，我们持续研究了其在大庆油田葡桃井区的流变性和驱油效率。结果表明，BD-HMHEC 溶液具有良好的增黏性、耐热性、耐盐性、耐剪切性和耐酸碱腐蚀性。BD-HMHEC 溶液的储能模量（G'）和损耗模量（G"）随浓度的增加显著增加，当浓度足够高时，溶液呈现出粘弹性。岩心驱替结果表明，在相同条件下，4000mg/L 的浓度下，BD-HMHEC 驱替比 HEC 驱替可提高 7-14%的采收率。此外，在进行水驱和水解聚丙烯酰胺（HPAM）驱替后，BD-HMHEC 驱替可提高 7-8%的采收率。根据可视化评价讨论了 BD-HMHEC 溶液的驱油机理。结果表明，BD-HMHEC 驱替是水/HPAM 驱替后提高采收率的一种可行方法。
