lesson 6 Flashcards
THIS HAPPENS WHEN A FLOW
REVERSAL EXIST
HYSTERESIS
THE CHANGE BETWEEN IMBIBITION
AND DRAINAGE
HYSTERESIS
OCCURS DUE TO CHANGING
INJECTION PATTERNS, INFILL
DRILLING, AND SHUTTING THE WELL.
HYSTERESIS
DEGREE TO WHICH FLUID
WETS SOLID SURFACE
WETTABILITY
AN INCREASE IN
WETTING-PHASE
IMBIBITION PROCESS
WATER FLOODING
IMBIBITION PROCESS
REDUCING SURFACE
TENSION
IMBIBITION PROCESS
BACK-PRODUCING AN
INJECTOR
DRAINAGE PROCESS
DECREASE IN
WETTING-PHASE
DRAINAGE PROCESS
EXIST ONLY WHEN DRAINAGE OCCURS FIRST
PRIMARY DRAINAGE CURVE
EXIST WHEN DRAINAGE
OCCURS AFTER IMBIBITION
SECONDARY DRAINAGE CURVE
oil relative permeability
may not be affected by water relative
permeability since it usually has a negligible
effect.
water-wet systems
HYSTERESIS EFFECT TO
SIMULATOR MAY LEAD TO:
USE OF SMALLER TIME STEPS
POOR MATERIAL BALANCES
water relative permeability
may have a significant effect.
oil-wet systems
all bets are off, meaning not one, both or none of the relative permeability curves may be affected.
intermediate/mixed wettability systems
Summing up hysteresis effects with
respect to wettability:
water-wet systems
oil-wet systems
intermediate/mixed wettability systems
SATURATION-DEPENDENT DATA
SPACING & SMOOTHNESS
AFFECTS RUNNING TIME OF A
MODEL
SPACING & SMOOTHNESS
SEMILOG PLOT of log (Kr) – Helps
to avoid discontinious curve
SPACING & SMOOTHNESS
The shifting of an existing
relative permeability curve
to account for the varying
critical (or connate) water
saturations.
END-POINT SCALING
Weighting of relative
permeability
MOBILITY WEIGHTING
Is a technique of deciding
which relative permeability
values to use to determine
flow in to a block
MOBILITY WEIGHTING
Another more improved
technique is the _________ which
reduces gridding effects.
two-point
upstream-weighting
2 METHODS OF WEIGHTING
1.) STONE I
2.) STONE II
