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注聚合物通常用来提高油层中的水驱效率。但是,此方法只能用于低温油藏,这是由于还没有适合的聚合物用于恶劣的油藏条件。用发酵法制得的这种硬葡聚糖聚合物展示了良好的性能,它能生成高粘的并具有良好抗剪切性能的溶液。粘度对盐和pH并不敏感,只是略受温度影响。为了促进硬葡聚糖聚合物的工业化生产,需要对溶液的可过滤性加以改善并对其在多孔介质中的状态进行更深入的了解。在聚合物凝聚时除去杂质可得到优质硬葡聚糖。这一点可用来评价聚合物分子的本征性能。从聚合物溶液中完全脱除杂质会使硬葡聚糖未有凝聚趋势,并具有良好的可过滤性,特别是在高温下更是如此。在多孔介质中改性硬葡聚糖的这种性能可通过在30～90℃内对贝雷岩芯进行岩芯驱替试验进行评价。结果表明渗透率下降较低,流动性下降接近相对粘度。在厌氧条件下把连续段塞注入贝雷(Berea)岩芯中可见高温下聚合物滞留率较低(30μg/g,90℃)。
Polymer injection is often used to increase waterflooding efficiency in the reservoir. However, this method can only be used in low temperature reservoirs because of the lack of suitable polymers for use in harsh reservoir conditions. This scleroglucan polymer produced by the fermentation process exhibits good properties and can produce a highly viscous solution with good shear resistance. Viscosity is not sensitive to salt and pH, but slightly affected by temperature. In order to promote the commercial production of scleroglucan polymers, there is a need to improve the filterability of solutions and to gain a deeper understanding of their state in porous media. Removal of impurities during coagulation of the polymer gives good scleroglucan. This can be used to evaluate the intrinsic properties of polymer molecules. Complete removal of impurities from the polymer solution results in no tendency for scleroglucan to aggregate and good filterability, especially at elevated temperatures. This property of modified scleroglucan in porous media can be evaluated by core-displacement tests on Berea cores at 30-90 ° C. The results show that the permeability decreases at a lower level, and the fluidity decreases to near relative viscosity. In anaerobic conditions, continuous slug injection into the Berea core showed that polymer retention was low at high temperatures (30 μg / g, 90 ° C).