Surgil ESIA Report - Volume III - EKN

“Management of Ustyurt GCC infrastructure objects
and Surgil GCF construction” UE »
Table P4.2 – Calculation of drilling mud danger class used for interval drilling 9-50m of the
production well in Surgil field (mud type – clay, polymer)
Serial number
Component
MPCg, mg/kg
Danger class in soil
MPCw, mg/l
Danger class in water
of household use
MPCf.e., mg/l
Danger class in water
of fish reservoirs
MPCa.d.(m.c.) mg/m 3
Danger class in atmospheric
air
1 2 3 4 5 6 7 8 9 10 11 12
Lg (S/MPC)
LD50
1. Bentonite - - - - 10 4 0.1 3 - -
4 0.01 - - 5000
Na + Na +
4. point - - 4 2 4 3 2 3 - 4
5. Caustic soda
200
120
2
- - by
by
Na + Na +
6. point - - 4 2 4 4 2 - - 3
7. К-4 - - 2 2 1 4 - - - -
8. point - - 4 2 4 4 - - - -
9. Water - - - - - - - - - -
10.
11.
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