Page 48 - A Practical Companion to Reservoir Stimulation

FRACTURING FLUIDS AND PROPPANTS

EXAMPLE C-6
Calculation of Settling Velocity

Using the data in Table C-3, calculate the settling velocity for
a particle with a diameter equal to 2.5 x m. I n' = 0.37 i
K' = 4Pa-s"'
Solution (Ref. Section 5-6)
From Eq. 5- 12, which is the modified Stokes law, PO = 2Pa-s

(9.78) (2650 - 1000) (2.5 x
u, = g = 9.78 m/sec2
18 (2)
Table C-3-Data for Example C-6.
+ (9.78) (2650 - 1000) (2.5 x 10-4)2
18 (4)
0.63
4
(C-28)
(2.5 x 10-413
and

u, = 2.8 x lo-' + 2.6 x 10-3uf'63, (C-29)
leading to u, = 3.18 x ds.

c-9