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

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Fortv-niner Anhvdrite. The upper anhydrite and<br />

gypsum unit <strong>of</strong> the Forty-niner Member lies from<br />

359.5 to 390 ft deep at H-14 (Figure 3-6). The unit is<br />

roughly 75% anhydrite and 25% gypsum, based on<br />

interpretation <strong>of</strong> a neutron log. The unit was tested in<br />

a DST straddle interval extending from 356.0 to<br />

384.5 ft deep. Thus, the bottom 3.5 ft <strong>of</strong> the Dewey<br />

Lake Red Beds and the Dewey Lake/Rustler contact<br />

were included in the test interval. Descriptions <strong>of</strong> the<br />

test instrumentation and the test data are contained<br />

in Stensrud et al. (<strong>1987</strong>).<br />

The Forty-niner anhydrite was tested from October<br />

14 to 15,1986. Because the anhydrite was expected<br />

to have too low a permeability to allow quantitative<br />

testing over the few days available for testing, no<br />

pressure-equilibration period preceded the testing.<br />

Instead, as soon as the packers were set, the tubing<br />

was swabbed with the shut-in tool open, and the test<br />

interval was left open to the tubing for about 16<br />

minutes for a flow period (Figure 5-100). Very little<br />

fluid entered the tubing at this time. The test interval<br />

was then shut in for about 16.5 hr. The pressure<br />

increased by about 1 psi over the first 1.5 hr <strong>of</strong> the<br />

buildup, and by only another psi over the last 15 hr.<br />

At that time, the testing was terminated. The Fortyniner<br />

anhydrite was judged to have a permeability<br />

much lower than that <strong>of</strong> the claystone, and<br />

quantitative testing <strong>of</strong> the anhydrite appeared to<br />

require weeks to months <strong>of</strong> effort.<br />

5.2.5.2 H-16. At H-16, only the medial clayey<br />

interbed <strong>of</strong> the Forty-niner was tested. At this<br />

location, this interbed is composed largely <strong>of</strong> clay,<br />

and is indurated to a claystone only in minor<br />

intervals. The clay lies from 562.6 to 573.8 ft deep<br />

(Figure 3-8), and was tested in an interval extending<br />

from 560.4 ft to the then-bottom <strong>of</strong> the hole at<br />

580.7 ft. The portions <strong>of</strong> the test interval overlying<br />

and underlying the clay are composed <strong>of</strong> gypsum<br />

E a0<br />

PRESSURE ABOVE TEST INTERVAL<br />

/ . ...... ..<br />

45<br />

30<br />

15<br />

L<br />

-<br />

-<br />

-<br />

.<br />

FFL<br />

\\<br />

FEU<br />

.....<br />

1<br />

0 L 4 6 8 10 12 14 16 18 20<br />

Start Dote: 10/ 14,'1986<br />

Start Time: 14: 00: 00<br />

Elopsod Time in Hours<br />

Linear-Lineor Sequence Plot<br />

H-14/FORTY-NINER ANHYDRITE TEST<br />

Figure 5-1 00. H-14/Forty-Niner Anhydrite Drillstem Test Linear-Linear Sequence Plot<br />

123

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