Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (1): 116-119.doi: 10.3969/j.issn.1673-8926.2009.01.023

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Study on late water flooding in Qikou 18-1 Field

LIU Ruiguo，WANGWeimin，SU Jinchang   

  1. Research Institute of Exploration and Development， Tianjin Branch， China National Offshore Oil Corporation， Tianjin 300452， China
  • Online:2009-03-16 Published:2009-03-16

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Abstract:

With insufficient edge water energy, Qikou 18-1 Field has produced for 7.5 years. The reservoir pressure decreased from 30.5 MPa to 14.8 MPa, far lower than the crude oil saturation pressure of 28.9 MPa. The precipitous decline of reservoir pressure leads to oil-gas-water three-phase flow and reduce the relative permeability of crude oil, which makes the crude production decreased. Based on the laboratory test, material balance method and numerical reservoir simulation are used to carry out the study. The result shows that reservoir pressure can build up to a certain extent with a rightful injection-production ratio in the initial water injection.

Key words: overpressure, episodic accumulation, seismic pumping, secondary migration, Fuyang reservoir, SongliaoBasin

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