乳化性能差异对中低渗岩心驱油效果的影响

Influence of emulsification performance difference on oil displacement efficiency
of medium-low permeability cores

徐晓丽 王业飞 李丹丹 刘晨 潘凌 王伟吉 王国瑞

中国石油大学（华东）石油工程学院，山东 青岛 266580 中海油研究总院，北京 100027 中国石化江苏油田分公司地质科学研究院，江苏 扬州 225012 克拉玛依市正诚有限公司，新疆 克拉玛依 834000

College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China CNOOC Research Institute, Beijing 100027, China Research Institute of Geological Science, Jiangsu Oilfield Commany, SINOPEC, Yangzhou 225012, China Karamay Zhengcheng Co. Ltd., Karamay 834000, China

乳化是表面活性剂的重要作用之一，对表面活性剂应用于三次采油的驱油效果具有重要影响。文中通过一系列室内实验，对比分析了2种乳化性能不同的表面活性剂在不同渗透率条件下，应用于单一表面活性剂驱和聚/表二元驱的驱油效果。实验结果表明，对于2种强化采油方式，在不同渗透率条件下，乳化效果好的表面活性剂提高采收率的效果更加明显。相对于单一表面活性剂驱，二元复合驱中乳化作用提高采收率的效果变弱。当渗透率较高时，良好的乳化性能可明显提高采收率，同时对注入压力的影响较小；当渗透率较低时，乳化作用的改善对提高采收率效果的影响不明显，并会引起注入压力的急剧升高。相对于中高渗地层而言，低渗地层化学驱更适于选用乳化性能较差或一般的表面活性剂。

Emulsification is one of the most important properties of surfactant, which has a remarkable influence on displacement characteristics used in tertiary oil recovery for surfactant. A series of laboratory experiments have been performed to analyze the effect of the displacement characteristics of two surfactants with different emulsification performances at the conditions of different permeability used for single surfactant flooding and polymer/surfactant binary system flooding. Results indicate that the surfactant with good emulsification effect shows obvious effect of enhanced oil recovery at the conditions of different permeability for two enhanced recovery methods. Compared with single surfactant flooding, the effect of emulsification in polymer/surfactant binary system flooding has been weakened. Emulsification can obviously enhance oil recovery rate at high permeability, with little influence on injection pressure. At low permeability, emulsification can slightly improve oil recovery, which can cause a sharp rising of injection pressure. With respect to medium-low permeability reservoirs, chemistry flooding should select the surfactants with poor and common emulsifications in low permeability reservoir.

10.6056/dkyqt201303029