等成本下聚合物及凝胶驱油效果
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“十三五”国家科技重大专项“大型油气田及煤层气开发”(项目编号 2016ZX05010003)。


Oil Displacement of Polymer and Crosslinked Polymer Gel Flooding on Equal Cost
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    摘要:

    聚合物驱、凝胶驱是我国陆上油田最主要的两种驱油体系,为考察等成本条件下聚合物和凝胶驱的驱油效果,采用三联填砂岩心管,模拟了不同浓度的聚合物驱、凝胶驱及聚合物-凝胶组合驱的采收率增幅,以及聚合物-凝胶交替注入工艺对采收率增幅的影响。研究结果表明:对于较均质油藏,相同药剂成本的低浓度聚合物驱、高浓度聚合物驱、低浓度凝胶驱及聚合物-凝胶组合驱采收率增幅差异不明显,单纯高浓度凝胶驱采收率增幅略小;对于非均质油藏,等成本凝胶驱及凝胶-聚合物驱组合采收率增幅明显大于单纯的聚合物驱或凝胶驱,其中凝胶-聚合物组合驱采收率增幅最大。等成本的凝胶-聚合物组合驱交替注入对采收率增幅有显著影响,其中凝胶-聚合物组合驱 4次交替注入采收率增幅最明显。图 3表 2参10

    Abstract:

    Polymer flooding and crosslinked polymer gel(CPG)flooding are the two most important oil displacement systems in China's onshore oil fields. In order to investigate the oil displacement effect of polymer and gel flooding under equal cost conditions,triple-filled sandstone tubes were used to simulate the different concentrations of polymer flooding,CPG flooding and polymer-CPG flooding and alternate injection process of polymer-CPG flooding. The experimental results showed that for homogeneous reservoirs,under equal cost,the difference of the enhanced oil recovery(EOR) of the low-concentration polymer flooding, high-concentration polymer flooding,low-concentration CPG flooding and polymer-CPG combined flooding was not obvious,and the EOR of high-concentration CPG flooding was slightly smaller;for heterogeneous reservoirs,EOR of the equal cost CPG flooding and polymer-CPG combined flooding was significantly greater than that of pure polymer flooding. Among them,the EOR of polymer-CPG combined flooding was the highest. The injection process of equal cost polymer-CPG combined flooding had a significant effect on the recovery rate,and the effect of 4 times alternate injections on the EOR was the most obvious.

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  • 在线发布日期: 2019-05-10
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