石油学报 ›› 2018, Vol. 39 ›› Issue (2): 189-200,246.DOI: 10.7623/syxb201802007

• 油田开发 • 上一篇    下一篇

变流度聚合物驱提高采收率作用规律及应用效果

朱焱1, 高文彬2,3, 李瑞升1, 李宜强2,3, 袁靖舒4, 孔德彬2,3, 刘吉雨4, 岳增存4   

  1. 1. 大庆油田有限责任公司第一采油厂 黑龙江大庆 163111;
    2. 中国石油大学石油工程教育部重点实验室 北京 102249;
    3. 油气资源与探测国家重点实验室 北京 102249;
    4. 中国石油大学提高采收率研究院 北京 102249
  • 收稿日期:2017-03-24 修回日期:2017-11-23 出版日期:2018-02-25 发布日期:2018-03-09
  • 通讯作者: 李宜强,男,1972年1月生,1993年获大庆石油学院学士学位,2006年获中国科学院渗流力学研究所博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事提高采收率、油气渗流物理模拟实验等方面的科研工作。Email:lyq89731007@163.com
  • 作者简介:朱焱,男,1965年3月生,1989年获大庆石油学院学士学位,2007年获中国科学院广州地球化学研究所博士学位,现为大庆油田有限责任公司教授级高级工程师,主要从事油田开发综合研究工作。Email:zhyandz@petrochina.com.cn
  • 基金资助:
    国家重大科技专项(2016ZX05010-003-001,2016ZX05025-003-010)和国家自然科学基金项目(No.51374221)资助。

Action laws and application effect of enhanced oil recovery by adjustable-mobility polymer flooding

Zhu Yan1, Gao Wenbin2,3, Li Ruisheng1, Li Yiqiang2,3, Yuan Jingshu4, Kong Debin2,3, Liu Jiyu4, Yue Zengcun4   

  1. 1. No.1 Oil Production Plant, Daqing Oilfield Company Limited, Heilongjiang Daqing 163111, China;
    2. Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China;
    3. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
    4. Research Institute of Enhanced Oil Recovery, China University of Petroleum, Beijing 102249, China
  • Received:2017-03-24 Revised:2017-11-23 Online:2018-02-25 Published:2018-03-09

摘要: 大庆油田二类油层相比一类油层具有渗透率低、非均质性强、砂体发育较差的特点,为了更大程度上发挥聚合物驱油技术在二类油层上的开发效果,基于聚合物驱油墙聚并理论和流度控制理论,提出了变流度聚合物体系的梯次降黏、恒压提速的注入方式,即采用先高黏低速调堵高渗层、后降黏提速启动中低渗层的段塞式注入方式。该方式与交替注入对比实验结果和矿场应用效果表明:变流度聚合物梯次降黏注入的驱替前缘压力梯度大,可聚并形成高饱和度油墙,大幅度降低含水率,明显增加高渗透层流动阻力,后续低黏段塞以提速注入的方式依次匹配进入中低渗透层,明显扩大了中低渗透层的波及体积,改善了高、中、低渗层流度差异,在降低注聚成本的基础上,进一步提高了聚合物驱在非均质油藏的采收率。在梯次注入基础上提出的变流度聚合物驱新设计思路,指出了变流度聚合物驱设计参数关键在驱替段塞的数量和聚合物体系同油层的匹配关系。

关键词: 聚合物驱, 变流度, 注入方式, 提高采收率, 作用规律

Abstract: Compared to the Class-Ⅰ oil layers in Daqing oilfield, Class-Ⅱ oil layers possess lower permeability, stronger heterogeneity and poorer sand-body development. To enhance the development effects of polymer flooding technology better in the Class-Ⅱ oil layers, the theory of oil bank forming and mobility control were adopted to instruct polymer injection pattern, and the echelon visbreaking injection with multiply-mobility polymer solutions was proposed. It was described as high-viscosity slug being injected with low rate and subsequent low-viscosity slugs being injected with higher injection rate. The physical experiment compared with alternative-injection pattern reveal that pressure gradient of displacement front with multiply-mobility polymer solutions could be considerable and highly concentrated oil bank could be formed, which substantially reduces total water cut and obviously improves the flow resistance of high permeability layer. Moreover, subsequent low-viscosity slugs injected with higher rate could evidently boost the absorption amount of mid and low permeability layers, which shrinks the mobility difference among sorts of permeability layers and amplifies the swept volume. Eventually, it could further enhances oil recovery under the condition of reducing polymer dosage cost. Further, the new design idea of adjustable-mobility polymer flooding was proposed on the basis of echelon injection. The conclusion is that the most sensitive parameters are numbers of polymer slugs and the relationships between polymer solutions and oil layers.

Key words: polymer flooding, adjustable mobility, injection pattern, enhanced oil recovery, action law

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