Selectivity of Pore-Scale Elastic Microspheres as a Novel Profile Control and Oil Displacement Agent
Selectivity of Pore-Scale Elastic Microspheres as a Novel Profile Control and Oil Displacement Agent
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DOI：
10.1021/ef300689c
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发表时间：
2012-08-01
期刊：
影响因子：
5.3
通讯作者：
Gao, Xuemei
中科院分区：
文献类型：
--
作者：
Yao, Chuanjin;Lei, Guanglun;Gao, Xuemei
在实验室条件下，可控制备了孔尺度弹性微球，并对其在盐水中的溶胀性能、稳定性和蠕变恢复性能进行了研究。研究了孔尺度弹性微球作为新型调剖（注水调剖）驱油剂的选择性。引入弹性微球粒径与填砂模型孔喉直径的匹配因子来表征二者的匹配关系。结果表明，最佳匹配因子为1.35-1.55。此外，采用一系列具有最佳匹配因子的非均质双管填砂模型，研究了调驱效果。分流实验表明，当匹配因子为最佳值时，弹性微球更倾向于选择性封堵高渗透层，而几乎不封堵低渗透层。驱油实验表明，弹性微球具有堵水不堵油的特性，能够改善低渗透层和高渗透层中低渗透区的波及状况和驱油效果。根据实验结果和刘28-1块实际情况，提出并实施了弹性微球调驱优化方案。结果表明，弹性微球能有效改善注水剖面。研究结果也证实了匹配因子是评价弹性微球调驱效果和指导现场试验的合适尺度。
Pore-scale elastic microspheres were prepared controllably and their swelling property, stability, and creep-recovery property in brine water were analyzed in laboratory. The goal of the research was to study the selectivity of the pore-scale elastic microspheres as a novel profile control (water injection profile modification) and oil displacement agent. The matching factor between particle size of elastic microspheres and pore throat diameter of sand pack model was introduced to characterize their matching relationship. The results indicate that the optimal matching factor is 1.35-1.55. Besides, the profile control and oil displacement effect were studied using a series of heterogeneous double-tube sand pack models with optimal matching factors. The shunt flow experiments show that when the matching factor is an optimal value, the elastic microspheres prefer to plug the high-permeability layer selectivity and almost do not clog the low-permeability layer. The oil displacement experiments show that the elastic microspheres have the characteristic of plugging water without plugging oil and can improve the sweep status and oil displacement effect of low-permeability layer and low-permeability area in the high-permeability layer. According to the experimental results and actual situation of Block Liu 28-1, an optimal program for the profile control and oil displacement of elastic microspheres was proposed and conducted. The results show that the elastic microspheres can improve the water injection profile effectively. The results also confirm that the matching factor is an appropriate measure to evaluate the profile control and oil displacement effect of elastic microspheres and to guide the field test.