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

Figure 5-94 is a log-log plot of the risinghead slugtest
data, along with the best-fit type-curve match.
The data were initially noisy before settling into a
steady recovery. The match shown corresponds to a
transmissivity estimate of 2.4 x 10-2 ft2/day
(Table 5-2), slightly lower than the values provided by
the DST buildup analyses. The static formation
pressure estimate used to obtain the fit in
Figure 5-94 was 133.0 psia, slightly lower than the
final SBU pressure.
The transducer was at a depth of 571.3 ft during the
DST's and slug test. With the fluid in the borehole
having a specific gravity of 1.2, a transducer reading
of 133.0 psia corresponds to a pressure at the
measured by the transducer before the test began
leaves a static formation pressure of 135.5 psig. In
comparison, the transducer installed at the Magenta
horizon as part of the H-16 5-packer completion
(Figure 3-8) provides a slightly lower estimate of the
Magenta static formation pressure. This transducer
indicates a stabilized pressure of 126 psig at a depth
of 587.2 ft (Stensrud et al., 1988), corresponding to a
pressure of about 134 psig at the midpoint of the
Magenta. Continued pressure-skin dissipation since
the completion of the slug test may account for the
slight difference in static formation pressure
estimates.
MATCH PARAMETERS
10-1
p' = 133.00psla
pi - 54.07 psia
-103
p -1
I 7.0 nr --
n DATA
TYPE CURVE
10-3 10-2 10' 100 10'
ELAPSED TIME, hours
102
Figure 5-94. H-1 6/Magenta Early-Time Slug-Test Plot
118