Beauheim 1987 - Waste Isolation Pilot Plant - U.S. Department of ...

10'
n
ui
K
3
v)
v)
W
a
n
v)
v) 100
W
4
2
0
v)
3
z
n
MATCH PARAMETERS
AP
t
= 1.Opsi
2 1.0hr
* Y
D PRESSURE DATA
* PRESSURE-DERIVATIVE DATA
- SI Y U LATlO NS
*
***- * * * ***
"I---
lo" _-
100 10' 102
DIMENSIONLESS TIME GROUP, tD/CD
** ** **
*Y
*** *
* *
*
*
-
-
103
Figure 5-29. H-l4/Upper Culebra Second Buildup Log-Log Plot with INTERPRET Simulation
For a final estimate of the upper Culebra
transmissivity, the SFL data were analyzed as a slug
test. Figure 530 shows a log-log early-time slug-test
plot of the SFL data, along with the best-fit type
curve. This fit provides a transmissivity estimate of
0.10 ftz/day (Table 5-3). which is in excellent
agreement with the FBU and SBU results.
ComDlete Cu lebra: The testing of the complete
Culebra consisted of two DST flow periods and two
buildup periods, followed by a rising-head slug test,
all on October 22,1986 (Figure 5-31). The FFL lasted
about 14 minutes, followed by a 77-minute FBU. The
SFL lasted about 24 minutes, and was followed by a
SBU lasting about 129 minutes. In order to obtain
constant rates for the FBU and SBU analyses, the
FFL and SFL were both divided into two Row periods.
The rates for the FFL were 0.381 and 0.260 gpm, and
those for the SFL were 0.271 and 0.173 gpm
VaMe 51). The slug test lasted about 204 minutes,
by which time about 77% of the induced pressure
differential had dissipated.
Figure 5-32 shows a log-log plot of the FdU data,
along with an INTERPRET-generated simulation.
The simulation is representative of a single-porosity
medium with a transmissivity of 0.30 ft*/day
(Table 5-3). Assuming a Culebra porosity of 20%, a
total-system compressibility of 1.0 x 10-5 psi-', and a
fluid viscosity of 1.0 cp, the skin factor for this
simulation is about -1 .I, indicating a moderately
stimulated well.
As was the case for the upper Culebra tests, the
pressure derivative in Figure 5-32 shows a sharp
decline at late time related to overpressure skin.
Effects of residual overpressure skin are also seen in
Figure 5-31 by the pressure peak at 94.1 7 psia during
the pre-test equilibration period, the subsequent
stabilization of the pressure at the end of the FBU at
91.48 psia, and the pressure peak at 90.05 psia at the
end of the SBU.
Figure 5-33 shows a log-log plot of the SBU data,
along with an INTERPRET-generated sirnulation.
70