Cr~(3+)聚合物凝胶与水交替注入调驱效果和机理分析——以渤海油田储层条件为例
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摘要
针对矿场减缓吸液剖面反转技术需求,以渤海油藏储层为模拟对象,以注入压力、含水率和采收率为评价指标,开展了"Cr3+聚合物凝胶+水"交替注入调驱方式增油效果实验及矿场研究。结果表明,调驱剂进入储层中低渗透层,一方面扩大了波及体积,另一方面增加了渗流阻力和吸液启动压力,引起吸液剖面反转。采用"Cr3+聚合物凝胶+水"交替注入调驱方式,不仅有利于增强Cr3+聚合物凝胶前置段塞对高渗透层的封堵作用,还可进一步发挥后续水段塞转向进入中低渗透层后的驱油作用,从而减缓甚至消除调驱剂进入储层中低渗透层后引起的吸液剖面反转现象。LD5-2油田A22井实施"Cr3+聚合物凝胶+水"交替注入调驱工艺后,压力明显提高,有利于增强驱替剂扩大波及体积效果。
Aiming at technical demand on relieving the reverse of imbibition profile,displacement effect of alternate injection of Cr3+polymer gel and water was studied,taking reservoir of Bohai oilfield as simulation object,regarding injection pressure,water content and recovery efficiency as evaluation index.Results showed that as the displacement agent flowed into the medium and low permeability layer,on the one hand,the swept volume was magnified.On the other hand,seepage resistance and start-up pressure of imbibition were increased,thus resulting in the reverse of the imbibition profile.Once the alternate injection of Cr3+polymer gel and water was adopted,polymer solution could get priority to flow into the high permeable layer and block off it,then subsequent water flowed into medium and low permeability layers to displace the oil.Therefore the phenomenon of the reverse of imbibition profile was relieved or even eliminated.Once the alternate injection of Cr3+polymer gel and water was conducted in A22 injection well in LD5-2Oilfield,injection pressure get increased,which was good for enlarging sweep volume effect.
Aiming at technical demand on relieving the reverse of imbibition profile,displacement effect of alternate injection of Cr3+polymer gel and water was studied,taking reservoir of Bohai oilfield as simulation object,regarding injection pressure,water content and recovery efficiency as evaluation index.Results showed that as the displacement agent flowed into the medium and low permeability layer,on the one hand,the swept volume was magnified.On the other hand,seepage resistance and start-up pressure of imbibition were increased,thus resulting in the reverse of the imbibition profile.Once the alternate injection of Cr3+polymer gel and water was adopted,polymer solution could get priority to flow into the high permeable layer and block off it,then subsequent water flowed into medium and low permeability layers to displace the oil.Therefore the phenomenon of the reverse of imbibition profile was relieved or even eliminated.Once the alternate injection of Cr3+polymer gel and water was conducted in A22 injection well in LD5-2Oilfield,injection pressure get increased,which was good for enlarging sweep volume effect.
引文
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[6]陈欣,卢祥国,鞠野,等.速溶聚合物及其Cr3+凝胶渗流特性[J].油田化学,2014,31(3):390-394.Chen Xin,Lu Xiangguo,Ju Ye,et al.SolubleInstant polymer and its Cr3+gel seepage characteristics[J].Oilfield Chemistry,2014,31(3):390-394.
[7]刘进祥,卢祥国,李国桥,等.特高矿化度Cr3+交联聚合物溶液渗流特性及其机制[J].中国石油大学学报(自然科学版),2013,37(6):145-152.Liu Jinxiang,Lu Xiangguo,Li Guoqiao,et al.Seepage characteristics and mechanism of Cr3+cross-linked polymer solution in ultra-high salinity media[J].Journal of China University of Petroleum(Edition of Natural Science),2013,37(6):145-152.
[8]邹剑,王荣健,薛宝庆,等.BZ28-2S油田Cr3+聚合物凝胶渗流特性及其调驱效果研究[J].海洋石油,2014,34(5):46-53.Zou Jian,Wang Rongjian,Xue Baoqing,et al.Study on the percolation property of Cr3+polymer gel and profile controlling effect in BZ28-2Soilfield[J].Offshore Oil,2014,34(5):46-53.
[9]陈广宇,田燕春,赵新,等.大庆油田二类油层复合驱注入方式优化[J].石油学报,2012,33(3):459-464.Chen Guangyu,Tian Yanchun,Zhao Xin,et al.Optimization of the ASP flooding injection pattern for sub-layers in Daqing oilfield[J].Acta Petrolei Sinica,2012,33(3):459-464.
[10]侯维虹.聚合物驱油层吸水剖面变化规律[J].石油勘探与开发,2007,34(4):478-482.Hou Jihong.Water injection profile variation of oil layers under polymer flooding[J].Petroleum Exploration and Development,2007,34(4):478-482.
[11]卢祥国,高振环,闫文华,等.人造岩心制作及其影响因素实验研究[J].大庆石油地质与开发,1994,3(4):53-55.Lu Xiangguo,Gao Zhenhuan,Yan Wenhua,et al.[J].Petroleum Geology&Oilfield Development in Daqing,1994,3(4):53-55.
[12]卢祥国,王树霞,王荣健,等.深部液流转向剂与油藏适应性研究—以大庆喇嘛甸油田为例[J].石油勘探与开发,2011,38(5):576-582.Lu Xiangguo,Wang Shuxia,Wang Rongjian,et al.Adaptability of a deep profile control agent to reservoirs:Taking the Lamadian Oilfield in Daqing as an example[J].Petroleum Exploration and Development,2011,38(5):576-582.
[13]符若文,李谷,冯开才.高分子物理[M].1版.北京:化学工业出版社,2004.
[14]陈震,赵孔双,刘昊.非导电球型粒子悬浮液宽频介电谱—薄双电层理论的计算机模拟[J].化学学报,2006,64(17):1780-1784.Chen Zhen,Zhao Kongshuang,Liu Hao.Broadband dielectric spectroscopy of non-conducting spherical particle suspensions:Computer simulation of thin double layer theory[J].Acta Chimica Sinic,2006,64(17):1780-1784.