Micro-influencing mechanism of permeability on spontaneous imbibition recovery for tight sandstone reservoirs

被引：0
|
作者：
Gu X. [1 ]
Pu C. [1 ]
Huang H. [2 ]
Huang F. [1 ]
Li Y. [1 ]
Liu Y. [1 ]
Liu H. [1 ]
机构：
[1] School of Petroleum Engineering, China University of Petroleum, Qingdao
[2] School of Petroleum Engineering, Xi'an Shiyou University, Xi'an
来源：
Pu, Chunsheng (chshpu@163.com) | 1600年 / Science Press卷 / 44期
关键词：
Adsorbed layer; Influence mechanism; Micro-nano pore; Oil recovery by imbibition; Permeability; Pore-throat connectivity; Tight sandstone;
D O I：
10.11698/PED.2017.06.12
中图分类号：
学科分类号：
摘要：
Taking the Chang 8 tight sandstone reservoir of the Yanchang Formation of Fuxian area in Ordos Basin as an example, the influencing mechanism of permeability on imbibition recovery in tight sandstone was explored by spontaneous imbibition experiment, combining nuclear magnetic resonance (NMR) and CT Scanning. Results show that: (1) spontaneous imbibition played a vital role in water-flooding of the tight sandstone reservoir, the recovery by spontaneous imbibition of experimental core samples can reach 5.24% - 18.23%, and the higher the matrix permeability, the higher the recovery degree by spontaneous imbibition; (2) because of the thickness of adsorbed layer, pores above sub-micron scale made a great contribution to the imbibition recovery of tight sandstone reservoir, and nano-submicron pores made less contribution to imbibition recovery; (3) the connectivity of pore and throat was the major microscopic mechanism of the positive correlation between matrix permeability and spontaneous imbibition recovery. Samples of different permeability didn't differ much in the sizes of sub-micron to micron pores, but with the rise of permeability, the connected pores and throats and surface porosity increased exponentially, leading to significant increase of imbibition recovery. © 2017, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：948 / 954
页数：6
相关论文
共 28 条
  • [1] Jia C., Zheng M., Zhang Y., Unconventional hydrocarbon resources in China and the prospect of exploration and development, Petroleum Exploration and Development, 39, 2, pp. 129-136, (2012)
  • [2] Zou C., Zhai G., Zhang G., Et al., Formation, distribution, potential and prediction of global conventional and unconventional hydrocarbon resources, Petroleum Exploration and Development, 42, 1, pp. 13-25, (2015)
  • [3] Wang X., Ren L., Advances in theory and practice of hydrocarbon exploration in Yanchang exploration area, Ordos Basin, Acta Petrolei Sinica, 37, pp. 79-86, (2016)
  • [4] Li H., Guo H., Yang Z., Et al., Tight oil occurrence space of Triassic Chang 7 Member in Northern Shaanxi Area, Ordos Basin, NW China, Petroleum Exploration and Development, 42, 3, pp. 396-400, (2015)
  • [5] Zhang Z., Chen S., Yang H., Et al., Tight oil accumulation mechanisms of Triassic Yanchang Formation Chang 7 Member, Ordos Basin, China, Petroleum Exploration and Development, 43, 4, pp. 590-599, (2016)
  • [6] Li Z., Qu X., Liu W., Et al., Development modes of Triassic Yanchang Formation Chang 7 Member tight oil in Ordos Basin, NW China, Petroleum Exploration and Development, 42, 2, pp. 217-221, (2015)
  • [7] Wang J., Liu Y., Chen M., Et al., Experimental study on dynamic imbibition mechanism of low permeability reservoirs, Petroleum Exploration and Development, 36, 1, pp. 86-90, (2009)
  • [8] Yuan S., Song X., Ran Q., Development Technology in Natural Fracture Reservoir, (2004)
  • [9] Cai J., Yu B., Advances in studies of spontaneous imbibition in porous media, Advances in Mechanics, 42, 6, pp. 735-754, (2012)
  • [10] Zhu W., Ju Y., Zhao M., Et al., Spontaneous imbibition mechanism of flow through porous media and waterflooding in low-permeability fractured sandstone reservoir, Acta Petrolei Sinica, 23, 6, pp. 56-59, (2002)
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