石油学报 ›› 2013, Vol. 34 ›› Issue (5): 924-931.DOI: 10.7623/syxb201305013

• 油田开发 • 上一篇    下一篇

大庆油田聚合物驱后微观剩余油分布规律

白振强1,2, 吴胜和1, 付志国2   

  1. 1. 中国石油大学地球科学学院 北京 102249;
    2. 大庆油田有限责任公司勘探开发研究院 黑龙江大庆 163712
  • 收稿日期:2013-02-17 修回日期:2013-07-18 出版日期:2013-09-25 发布日期:2013-08-01
  • 通讯作者: 白振强
  • 作者简介:白振强,男,1978年11月生,2002年毕业于西安石油学院,现为中国石油大学(北京)地球科学学院博士研究生,主要从事油藏精细描述科研工作。Email:baizhenqiang@petrochina.com.cn
  • 基金资助:

    国家重大科技专项(2011ZX05052)资助。

The distribution of microcosmic remaining oils after polymer flooding in Daqing oilfield

BAI Zhenqiang1,2, WU Shenghe1, FU Zhiguo2   

  1. 1. Institute of Earth Sciences, China University of Petroleum, Beijing 102249, China;
    2. Research Institute of Petroleum Exploration & Development, Daqing Oilfield Company Limited, Daqing 163712, China
  • Received:2013-02-17 Revised:2013-07-18 Online:2013-09-25 Published:2013-08-01

摘要:

聚驱后微观剩余油分布规律是进行聚驱后剩余油预测和挖潜的基础。利用冷冻制片、紫外荧光和激光共聚焦扫描显微分析方法,对大庆油田聚合物驱后不同水洗程度岩样微观剩余油分布规律进行研究。分析认为,聚驱后弱水洗岩样剩余油以簇状和粒间吸附状自由态剩余油类型为主,中水洗样品束缚态剩余油所占比例达到42.9%,强水洗样品的剩余油以颗粒表面薄油膜状的束缚态分布为主。聚驱后随着驱油程度增加,轻质组分比例减少明显,而重质组分比例增加,重质组分呈连片型分布在岩石颗粒表面,轻质组分则呈小片状和较为连续的整体零散、局部富集的状态分布在粒间孔隙中。粒内微孔和粒间微小喉道处黏土矿物与轻质组分共存,在颗粒内被黏土矿物完全充填的粒内裂隙和微孔中没有原油分布。

关键词: 紫外荧光, 激光共聚焦, 聚合物驱, 微观剩余油, 原油组分

Abstract:

The distribution of microcosmic remaining oils after polymer flooding is a basis for forecasting and tapping the potential of remaining oils after polymer flooding. By applying some novel methods wihich including frozen sectioning, ultraviolet fluorescence and laser confocal scanning microscopic analysis, distribution laws are studied about microcosmic remaining oils after polymer flooding in rock samples with different water-washing degrees from the Daqing oilfield. The analytical result demonstrated that the remaining oil in weak water-washing rocks after polymer flooding is mainly in cluster and intergranular adsorption forms of free residual oils, while the bounded remaining oil in medium water-washing rocks accounts for 42.9% of the total microcosmic remaining oils and the remaining oil in strong water-washing rocks occurs mainly in a bounded form of thin oil film that envelops the particle surface. With the increase of oil displacement degree after polymer flooding, the proportion of lightweight hydrocarbon components decreases significantly, while that of heavy hydrocarbon fractions increases relatively. In general, heavy hydrocarbon components are continuously distributed on the surface of rock particles, while lightweight hydrocarbon components occur in intergranular pores mainly in a flaky, relatively continuous and whole scattered but locally enriched state. The clay minerals and lightweight hydrocarbon components coexist within intragranular micropores and tiny pore throats. There is no oil within particle fractures and pores that are fully filled with clay minerals.

Key words: ultraviolet fluorescence, laser confocal scanning, polymer flooding, microcosmic remaining oil, crude oil fraction

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