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

and anhydrite, and were not considered to have
contributed significantly to the fluid-pressure
responses observed. Descriptions of the test
instrumentation and the test data are presented in
Stensrud et al. (1988).
Testing was performed on July 27 and 28,1987, and
consisted of a pulse-injection test followed by two
DST flow periods, two buildup periods, and a risinghead
slug test (Figure 5-101). The pulse test lasted
about 249 minutes. The FFL lasted about 21
minutes, and was followed by a 429-minute FBU.
The SFL lasted about 31 minutes, and was followed
by a 594-minute SBU. To obtain constant flow rates
for buildup analyses, the FFL was divided into two
flow periods having flow rates of 0.010 and
0.005 gpm, and the SFL was divided into two flow
periods having flow rates of 0.016 and 0.007 gpm
(Table 51). The slug test lasted about 263 minutes,
with only about 4.5% of the induced pressure
differential dissipating during this time.
Figure 5-102 is a semilog plot of the Forty-niner
pulse-test data, showing the best typecurve match
achieved. The data and type curve match
reasonably well, with the greatest discrepancy
occurring at early time. The transmissivity calculated
from this match is 2.2 x 10-4 ft2/day (Table 5-2).
Figure 5-103 is a log-log plot of the DST FEU data,
along with a simulation generated by INTERPRET.
The simulation fit the data very well, and is
representative of a single-porosity medium with a
transmissivity of 5.3 x 10-3 ftz/day (Table 5-2).
Assuming a porosity of 30%. a total-system
compressibility of 1 .O x 10-5 psi-', and a fluid viscosity
of 1.0 cp, the skin factor for this simulation is 0.7,
indicating a wellbore with little damage. The decline
in the pressure derivative at late time reflects minor
overpressure-skin effects. The dimensionless
Homer plot of the FBU data (Figure 5-104) shows an
excellent fit between the data and the simulation
using a static formation pressure estimate of
11 7.2 psia.
J PULSE
J
/EQUILIBRATION
PRESSURE ABOVE TEST INTERVAL
-
A.
-- A
I FBU \s~u
-
o k
I
10 ' I
I I I I 20 In I I I 30 I
I I I 40 ' I I I I I I 50 I I I 60 ' I
FFL
I I 70 a
I
b
SFL
3--
SLUG
00 I * uLu 90 I * 100
124