Page 239 - Reservoir Formation Damage

Single-Phase Formation Damage by Fines Migration and Clay Swelling 219

-6.0
lOcc/min

-6.5

-r.o L fr 2 = 20.6 x I0

NH4N0 3.*MeOH
3
fr, = 5.35 x IO' l/min
-7.5

Q =3cc/m1n
-*] 2. PORE SWEEPING
I |
-8.0
50 100 150 200 250
(
TIME W i n )
Figure 10-14. Diagnostic chart for combined effects of gradual pore blocking
and sweeping (after Wojtanowicz et al., ©1987 SPE; reprinted by permission
of the Society of Petroleum Engineers and after Wojtanowicz et al., ©1988,
reprinted by permission of the ASME).

Completion Fluid-NoCI (9.5 ppg)
o 0-2 % Con!., S-4 Contaminant Drilling Mud
A 0.5% Conf., S-l Synthetic Core Type S
A |.0 % Cent., S-3 Ki = 670 rod
O 2.0 % Conl., S-5 RV.= I8.3cc
• 3.0% Cont., S-2 q - 10 cc/min
GRADUAL BLOCKING

SCREENING

0 5 10 15 20 25 3O 35 40 45 50
CUMULATIVE INJECTION (Pore Volume P.V.)
Figure 10-15. Comparison of the effects of gradual blocking, screening, and
straining on permeability reduction (after Wojtanowicz et al., ©1987 SPE;
reprinted by permission of the Society of Petroleum Engineers and after
Wojtanowicz et al., ©1988, reprinted by permission of the ASME).