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聚合物溶液黏度与黏弹性损失对驱油效率的影响
马云飞,侯吉瑞,尚丹森,赵凤兰,吴凡
中国石油大学(北京)提高采收率研究院, 北京 102249
Effect of the loss of viscosity and viscoelasticity on displacement efficiency in polymer flooding
MA Yunfei, HOU Jirui, SHANG Dansen, ZHAO Fenglan, WU Fan
EOR Institute of China University of Petroleum-Beijing, Beijing 102249, China

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摘要  为了研究聚合物溶液在多孔介质间长距离运移过程中黏度与黏弹性的变化规律,并确定其损失对驱油效率的影响,本文通过室内实验对聚合物驱进行了模拟。建立了30 m长填砂物理模型,在注入聚合物驱的过程中,于模型沿程不同位置分别采出样品,分析溶液表观黏度、聚合物分子量和浓度的变化规律。基于以上结果,配制与不同距离下采出液性质相同的聚合物溶液进行岩心驱油实验,并与同黏度丙三醇水溶液进行对比。实验结果表明,聚合物驱过程中溶液浓度和聚合物分子量随运移距离的增加而降低,基本满足线性规律;溶液黏度随距离的增加先快速下降,而后趋于平稳;储能模量在近井地带的损失非常严重。聚合物驱的驱油效率提高值随着运移距离的增大而逐渐降低,运移距离越远,聚合物溶液的提高采收率能力越弱,这与溶液黏度和黏弹性的损失密切相关,其中弹性损失对驱油效率的影响比黏性更为显著。该室内研究成果可为聚合物驱的优化设计提供一定的参考。
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关键词 : 聚合物驱, 黏度损失, 黏弹性损失, 提高采收率, 驱油效率
Abstract

  To investigate the trends of change of viscosity and viscoelasticity during long distance migration in polymer flooding and to research the effect of the loss of viscosity and viscoelasticity on displacement efficiency, a series of laboratory physical experiments were conducted to simulate polymer flooding. A 30 m long sand packed model was built for the physical simulation. Following the injection, samples were obtained from sampling points along the model, and the properties of the samples such as polymer concentration, molecular weight and viscosity were analyzed. Based on the results, polymer solutions which have similar properties to the samples were prepared for the core displacement experiments. For comparison, glycerol solutions similar in viscosity were used as displacement agents in the same conditions. The results indicated that polymer concentration and molecular weight decreased with increase in the migration distance, and followed an approximately linear trend. The viscosity declined rapidly first, and then stabilized with the distance increase. The storage modulus decreased sharply in the near inlet area. Furthermore, the increment of displacement efficiency decreased with increasing distance, which was closely related to the loss of viscosity and viscoelasticity. This suggested that elasticity loss had a deeper impact than viscosity on displacement efficiency.  This research can provide a basis for the optimization of polymer flooding design.

Key words: polymer flooding viscosity loss viscoelasticity loss enhanced oil recovery displacement efficiency
收稿日期: 2016-10-13     
PACS:    
基金资助:国家自然科学基金项目(51174216)和国家科技重大专项(2011ZX05052)联合资助
通讯作者: 侯吉瑞 houjirui@126.com
引用本文:   
马云飞,侯吉瑞,尚丹森,赵凤兰,吴凡. 聚合物溶液黏度与黏弹性损失对驱油效率的影响[J]. 石油科学通报, 2017, 2(1): 133-141. MA Yunfei, HOU Jirui, SHANG Dansen, ZHAO Fenglan, WU Fan. Effect of the loss of viscosity and viscoelasticity on displacement efficiency in polymer flooding. Petroleum Science Bulletin, 2017, 2(1): 133-141.
链接本文:  
http://sykxtb.cup.edu.cn/CN/10.3969/j.issn.2096-1693.2017.01.013 或 http://sykxtb.cup.edu.cn/CN/Y2017/V2/I1/133
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