4.analyze the rule of producing water (1).The relationship between water-cut and Kw/Ko KnI4w 1 M fv= ,+Q.K。/,+K./4。+元，1+ 11+M M 1 f=K。.) 1+ 。４. analyze the rule of producing water （1）. The relationship between water-cut and Kw / Ko M M M K K K Q Q Q f w o w o o w w w w o w w w           1 1 1 1 / / /       1 ( ) 1 o w w o w K K f     