Transcription of Chapter 10: Relative Permeability
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Chapter 10: Relative Permeability
Formation Evaluation MSc Course Notes Relative Permeability Chapter 10: Relative Permeability Introduction and Definition Routine Permeability measurements are made with a single fluid filling the pore space. This is seldom the case in the reservoir situation except in water zones. Generally, two and sometimes three phases are present, oil, water, and occasionally gas as well. Here one would expect the Permeability to either fluid to be lower than that for the single fluid since it occupies only part of the pore space and may also be affected by interaction with other phases. The concept used to address this situation is called Relative Permeability . The Relative Permeability to oil, Kro, is defined as: K eo effective oil Permeability K ro = = ( ). K base Permeability Similarly we can define: K ew effective water Permeability K rw = = ( ). K base Permeability K eg effective gas Permeability K rg = = ( ).
Typical intermediate wettability relperm data are shown in Figures 10.17 and 10.18. The shape of the relperm curves is significantly different for the high and low rate floods. However, the volume of oil produced is similar. Figure 10.19 shows steady state data obtained from a core containing mobile kaolinite fines.
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