Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 103-108.doi: 10.3969/j.issn.1673-8926.2016.06.014

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Washing oil methods of cores from tight reservoirs in Junggar Basin： a case study of Lucaogou Formation in Jimsar Sag

Jin Jun， Wang Ziqiang， Meng Haojin， Guo Juncheng， Deng Yong   

  1. Research Institute of Experiment Detection， PetroChina Xinjiang Oilfield Company， Karamay 834000， Xinjiang， China
  • Received:2015-12-04 Revised:2016-01-25 Online:2016-11-10 Published:2016-11-10

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Abstract: In order to resolve the existing problems of long cycle and poor quality of washing oil for cores from tight reservoirs, a variety of pumping solvents, washing oil solvents and different methods to remove oil from tight cores were studied experimentally. The results show that dimethylbenzene is an excellent water extraction solvent due to its high boiling point, while the mixture of alcohol, benzene and chloroform with the ratio of 1∶2∶2 performed outstandingly good in the extraction of oil from tight cores because of high oil percentage of its leach liquor （14%）. The fluorescence level is less than three and the quality, porosity and permeability are steady after 7-8 circles （16 days） with pressurized saturated solvent method and CO2 pressure method. The effect met the standard of SY/T 5336－2006. This method isproved to be suitable for washing oil from tight cores in Junggar Basin.

Key words: sandstone reservoir, ultra-low permeability reservoir, pore structure, Chang 8 oil reservoirset, Ordos Basin

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