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Experimental Study of Rheological Properties and Oil Displacement Efficiency in Oilfields for a Synthetic Hydrophobically Modified Polymer

机译:合成疏水改性聚合物在油田的流变性质和驱油效率的实验研究

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摘要

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.
机译:在以前的研究中,我们开发了使用溴十二烷(BD)的合成疏水改性羟乙基纤维素(HEC),我们将其称为BD-HMHEC。在这项工作中,我们继续研究中国大庆油田浦陶井区的流变特性及其驱油效率。结果表明,BD-HMHEC溶液具有良好的粘度,耐热性,耐盐性,抗剪切性和耐酸碱性能。 BD-HMHEC溶液的储能模量(G’)和松散模量(G”)随着BD-HMHEC浓度的增加而显着增加,并且在足够高的BD-HMHEC浓度下溶液变成粘弹性。岩心驱油结果表明,与当量条件下4,000 mg / L的HEC驱油相比,BD-HMHEC驱油可提高7-14%的采收率。此外,BD-HMHEC驱油在进行水和水解聚丙烯酰胺(HPAM)驱油后,可使采油量提高7–8%。基于目测评价,讨论了BD-HMHEC溶液的驱油机理。结果表明,BD-HMHEC驱油是提高水/ HPAM驱油后采收率的可行手段。

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