Abstract In polymer flooding process, the poor solubility of polymer and the wrap of incompletely dissolved polymer particles with heavy oil lead to the generation of complicated blockage, which seriously affects the normal production of wells. Therefore, how to fabricate an effective blockage removal agent is particularly important. Based on the blockage from Bohai Offshore Oilfield in China, a blockage removal agent composed of (0.5 wt% potassium persulfate + kerosene (the ratio of kerosene: blockage is 3:5)+0.3 wt% OP-10, the oil-water ratio is 1:9) was developed. The removal effect and mechanism were characterized by weight loss method and core test. Moreover, the emulsification property of the removal agent was also evaluated by microscopic appearance. The results showed that the blockage removal agent can be formulated as an O/W emulsion and had good stability for more than 72 h. Core test showed that the permeability had a significant improvement after injection of removal agent. The emulsion-type removal agent can demulsify after contact with the blockage, then the oil-soluble detergent as internal phase in emulsion can be released which contributes to the wash off of heavy oil. Accompanied with the polymer degradation by the oxidant, this agent realized the effective dissolution and removal of blockage.

中文翻译：

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一种聚合物提高稠油采收率的乳液型解堵剂的研究

摘要 在聚合物驱过程中，聚合物溶解性差，不完全溶解的聚合物颗粒被稠油包裹，导致产生复杂的堵塞，严重影响井的正常生产。因此，如何制备有效的除堵剂显得尤为重要。以我国渤海海上油田的堵堵为基础，研制出一种由（0.5 wt%过硫酸钾+煤油（煤油：堵堵比为3:5）+0.3 wt% OP-10，油水比）组成的堵堵剂是 1:9) 开发。通过失重法和核心试验对去除效果和机理进行表征。此外，还通过显微外观评价去除剂的乳化性能。结果表明，该解堵剂可配制成O/W型乳液，并具有良好的稳定性超过72 h。岩心试验表明，注入去除剂后渗透率有显着提高。乳化型去垢剂与堵塞物接触后破乳，释放出乳化液内相的油溶性洗涤剂，有助于洗去重油。伴随着氧化剂对聚合物的降解，该药剂实现了对堵塞物的有效溶解和清除。然后可以释放作为乳液内相的油溶性洗涤剂，有助于洗掉重油。伴随着氧化剂对聚合物的降解，该药剂实现了对堵塞物的有效溶解和清除。然后可以释放作为乳液内相的油溶性洗涤剂，有助于洗掉重油。伴随着氧化剂对聚合物的降解，该药剂实现了对堵塞物的有效溶解和清除。