Surgil ESIA Report - Volume III - EKN

“Management of Ustyurt GCC infrastructure objects
and Surgil GCF construction” UE »
unit (sprayer). 3 persons will be involved in suppression of sulfate reducing bacteria in cuttings storage
barn (technologist, unit driver and operator), duration of operation is 1 day. Scope and types of
works, and also required quantity of materials for suppression of sulfate reducing bacteria in cuttings
storage barn are resulted in table 8.1.
Table 8.1 – Required quantity of materials, scope and types of works for suppression of sulfate
reducing bacteria
№№ Parameter name Unit
Numerical
value
1 2 3 4
1.
Drilling cuttings treatment (moving, semi-liquid, fluid
phase)
m 3 345
2. Blue copperas (СuSO 4 )х5Н 2 О kg 34.5
3. SAS kg 690
4. Process water m 3 0.7
5. Tank truck with tank capacity to 6m 3 pcs. 1
6. Reagent preparation for work (mixing in tank truck) un. 1
7.
Drilling cuttings surface treatment by 10% blue copperas
and SAS solution
un. 1
8. Set in operation labor content person 2
9. Duration of operation day 1
10. Tank truck transportation under own power
8.6.16. After realization of measures for drilling cuttings neutralization from hydrogen sulfide, on
the expiry of 2 days, there are begins works on drilling cuttings neutralization/hardening.
Whereas that drilling cuttings contains oil products in small amounts, it is necessary to add
to binding substance – Portland cement quicklime in quantity to 20% from cement. Also, for
reduction of consumable it is allowed bentonite addition in drilling cuttings, concerning to
IV danger class – low-hazard dangerous wastes. In the case of EСO-2hardener use there is
not required consumables.
8.6.17. This stage of neutralization/hardening of the upper, moving, fluid layer of drilling cuttings is
carried out manually or mechanically, at contractor discretion, under condition of strict observance
of labor safety rules and operational experience on drilling wastes disposal in cuttings
storage barn in the Southwest Gissar and Kandym fields.
8.6.18. With a glance of DSW clarification and time of drilling cuttings sludge for DSW evaporation,
it is accepted, that before the beginning of works on drilling cuttings neutralization/hardening,
the liquid phase practically is absent and there is to 40-50sm of semi-fluid
paste-like phase on barn surface (calculations of thickness volume of evaporation of water
are resulted in Appendix 3).
8.6.19. Prior to the beginning of works there is carried out preliminary survey of the barn territories,
one of the barn sides near which there is the plain and cleared area for engineering, is accepted
for base and there is made hollows excavation by excavator from three opposite sides
into the perimeter of barn (in 3-4 hollows from each side) for liquid phase leavings running
off from lenses. All works on drilling cuttings mixing and cuttings storage barn alignment
are executed from the base side.
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