5

0 1000 2000 3000 4000 5000 6000 7000

Figure 9-15. Effect of pressure differential on drilling rate in loose sand. (From Cunningham and Eenik.15 Copyright 1959 by SPE-AIME.)

20 x 104

-.2 10X104

5 x 104

-.2 10X104

5 x 104

2 3 4 5 6 7 Core Length, cm

inil.,,.l,,,.[,...I I,I..1 Illl.lt..,!,...1,...lll.llll.,In.llll,.l.l,,llllllMl

Figure 9-16. Permeability function and pressure gradient versus core length for water (vertical Berea sandstone, pb = 1,000 psig). (From Young and Gray.'19 Copy right 1967 by SPE-AIME.)

0 0

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