【摘要】 聚合物溶液的注入性和驱油能力是评价聚合物驱在油藏适应性方面的重要内容。通过室内不同渗透率岩心的流动实验,研究了相对分子质量分别为400×10⁴和800×10⁴的部分水解聚丙烯酰胺溶液在低渗透岩心中的注入性和驱油能力,并在此基础上,分析了中低相对分子质量聚合物溶液在低渗透油层的适应性。实验结果表明,质量浓度为700和1 200mg/L的聚合物溶液能够注入到渗透率大于30×10^-3μm²的岩心中,且相对分子质量越小,浓度越低,越易注入;但是,相对分子质量为400×10⁴的聚合物溶液在岩心下部的驱油能力较差。综合比较聚合物溶液的注入性和驱油能力,对于渗透率为10×10^-3～50×10^-3μm²的低渗透油藏,建议选择相对分子质量为800×10⁴、质量浓度为700mg/L的聚合物溶液。更多还原

【Abstract】 The injectivity and oil-displacement capacity of polymer solution are two important aspects in adaptability evaluation of polymer flooding. According to flow performance experiments of cores with different permeability,the injectivity and oil-displacement capacity of polymer solution in low-permeability cores with molecular weight of polymer solution of 4 million and 8 million is studied,and based on that, applicability on polymer solution of mid to high molecular weight in low permeability layer is further analyzed.The results of study imply that the concentration of 700mg/L and 1 200mg/L could be injected into the cores when its effective permeability is more than 30×10^-3μm²,the smaller molecular weight,the lower the concentration,and the easier the injectivity,but the oil-displacement capacity of polymer solution with molecular weight 4 million is poor.Comparing the injectivity and oil-displacement capacity of polymer solution comprehensively, the polymer solution with molecular weigh of 8 million and concentration of 700mg/L is suggested,when the permeability of reservoir is between 10×10^-3μm² and 50×10^-3μm².更多还原