In a two-region reservoir model, how is the skin factor “s” calcu

1.	In a two-region reservoir model, how is the skin factor “s” calculated?
A.	[(k/ks)-1]ln(rs/rw)
B.	[(k/ks)+1]ln(rs/rw)
C.	[(ks/k)-1]ln(rs/rw)
D.	[(ks/k)+1]ln(rs/rw)
Answer» B. [(k/ks)+1]ln(rs/rw)

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