MIL-HDBK-1164
personnel avoid standing in pits or depressions adjacent to the well being treated.
Carbon dioxide and hydrogen sulfide are heavier than air and settle in low areas.
(9)
Do not pump nearby wells when acid treatment is in
progress.
(10) In addition to cleaning the well screen in place, the acidizing
treatment described above can be used to dissolve encrustations before pulling the
well screen. This treatment helps loosen the well screen in the well and makes it much
easier to pull.
b)
Chlorine Treatment. Chlorine solutions may also be used to clean
well screens. Chlorine added to a clogged well functions primarily by destroying
bacterial slime growths. Follow steps (1) through (3) below:
(1) Prepare solutions of chlorine that produce 100 to 200 mg/L of
chlorine when mixed with the water in the well (Table 2). Introduce the solution into the
well using the procedure described for acid treatment (par. 4.5.3.1[a][4]).
Table 2
Materials Required for 100 Gallons (400 Liters)
of Chlorine Solution
Quarts (L) of Bleach Per
Desired
Dry Calcium
100 Gallons (400 L) of Water
Chlorine
Chlorine
Hypochlorite 70%
Strength
pounds (g)
pounds
(g)
5%
7%
10%
50 ppm
0.05
(23)
0.07
(32)
0.4
0.3
0.2
100 ppm
0.10
(45)
0.14
(65)
0.8
0.6
0.4
150 ppm
0.15
(68)
0.20
(97)
1.2
0.9
0.6
200 ppm
0.20
(91)
0.30
(130)
1.6
1.2
0.8
300 ppm
0.25
(113)
0.40
(162)
2.4
1.7
1.2
400 ppm
0.35
(159)
0.50
(227)
3.2
2.3
1.6
30
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