西南石油大学学报(自然科学版) ›› 1999, Vol. 21 ›› Issue (1): 21-24.DOI: 10.3863/j.issn.1000-2634.1999.01.006

• 油气藏工程 • Previous Articles     Next Articles

INFLUENCE OF INJECTION RATE ON WATERFLOODING DEVELOPMENT OF LOW PERMEABILITY OILFIELDS

Deng Ying-Er Liu Ciqun
  

  1. Institute of Fluid Mechanics,Chinese Academy of Sciences
  • Received:1998-06-01 Revised:1900-01-01 Online:1999-02-20 Published:1999-02-20
  • Contact: Deng Ying-Er

Abstract: The existing theory of waterflooding is based on Darcy’slaw. However, studies and oilfield development practice have shown that in low permeability reservoirs the flow does not follow Darcy’s law, with a starting pressure gradient (SPG) occurring in the process. With SPG taken into account, this work formulates the method of calculating indices of waterflood devel-
opment before and after water occurs in the well array, under the condition of constant injection rate. Application of the formulas is illustrated with an example. Influence of injection rate on waterflood recovery is discussed. The results show that SPG has marked influence on the indices; and that there is an optimum injection rate at which the indices are most effective.

Key words: low permeability, waterflooding, nondarcy flow, starting pressure, development index, injection rate

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