Page 11 - A Practical Companion to Reservoir Stimulation

PRACTICAL COMPANION TO RESERVOIR STIMULATION

From Eq. 1-2 and the pressure match: From the value of the CDe"'(obtained from the match), the
skin effect can be calculated:
(1.02) (141.2) (33) (1.1) (1.05)
k= = 8.3 md. (A-3)
(66) (10)
(A-6)
Dividing both sides of Eq. 1-3 by C, results in
The two analyses are within 12% for the permeability and
0.000264 k t
t,lC, = (A-4) 17% for the skin effect, which is an excellent agreement.
c, 4 P c, r:, .
Eq. A-4 and the time match can be used to calculate CD: ,

(0.000264) (8.3) (0.1) ' <
CD = = 195. (A-5)
(0.22) (0.31) (1.1) (6x (0.5)*

1000

h
v)
a
- 100
21%
'D 0
*- 0
n
C
rn
Q 0
U 0 0
0. 0
0
0

10

5
-1 1 00

Figure A-1-Log-log diagnostic plot for Example A-1

A- 2