西南石油大学学报(自然科学版) ›› 2000, Vol. 22 ›› Issue (3): 34-36.DOI: 10.3863/j.issn.1000-2634.2000.03.009

• 石油工程 • Previous Articles     Next Articles

CALCULATING RELATIVE PERMEABILITY OF NON-DARCY FLOW IN LOW PERMEABILITY MEDIA

DENG Ying-er1 WANG Yuncheng1 LIU Ciqun2 et al.

  

  1. (Chengdu University of Technology)
  • Received:1999-11-12 Revised:1900-01-01 Online:2000-08-20 Published:2000-08-20
  • Contact: DENG Ying-er

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Abstract: Existing calculation method of relative permeability is based on Darcy’s law. However, studies have shown that flow in low permeability media does not follow Darcy’s law, and that a starting pressure gradient (SPG) occurs in the percolation. Therefore, formulas of relative permeability with SPG taken in-
to account are derived. Additionally, an unsteady state flow wa-ter- oil relative permeability test is performed. The results show that: 1)the residual water and oil saturations are higher in the relative permeability curves of low permeability media; 2)the region of two phase flow is narrower; 3)relative permeabili-ty of oil decreases quickly and relative permeability of water in-
creases slowly with water saturation increasing; 4)oil production declines quickly after water occurs in the wells, and 5)water drive recovery for low permeability reservoirs is lower.

Key words: low permeability pools, non- Darcy flow, unsteady state flow, relative permeability

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