Surgil ESIA Report - Volume III - EKN

Management procedure of the drilling wastes
(cuttings barns) recycling, generated during
production wells drilling in Surgil field
Appendix 4
CALCULATION OF DRILLING MUD DANGER/TOXICITY CLASS USED DURING
WELLS CONSTRUCTION IN ACCORDANCE WITH GROUP WORKING DRAFT FOR
SURGIL FIELD
Calculation of drilling mud toxicity class provided by Group working draft for production
wells construction in Surgil field is carried out by method stated in “Criteria of wastes reference to
danger class for environment”, approved by the order № 511 MPR of Russia from June, 15, 2001.
This criteria is developed according to the Federal law of the Russian Federation “On production
and consumption wastes” from June, 24, 1998 № 89-F3 (article 14).
Model based on use of the systematized set of environmental safety parameters which is
formed for each waste component is put in a basis of calculation of waste danger class. The system
of environmental safety parameters for each component is formed with a glance, that maximum
number of environmental safety parameters necessary for definition of waste danger class is established
equal to 12. The number of parameters which can be included in system can be any from 1 to
12.
The system, as obligatory parameter, include additional dataware index. Dataware index
characterizes formed system from the point of view of initial information sufficiency for assessment
of waste environmental danger and is defined by division of number of parameters included in system
(n) (i.e. parameters on which there is information in corresponding regulations and official reference
books), into number of parameters for full system (N=12).
This index equally with other environmental safety parameters considers the danger caused
by data deficiency on parameters for this or that waste component. At presence in information
sources the several values for environmental safety parameters (for example, LD 50 for different species
of animals) is selected volume corresponding to the maximum danger, i.e. the least value of
LD 50 . In the absence of necessary data it is possible to take the nearest by meaning index: for example,
instead of LD 50 at peroral inflow to take the similar data received at intravenous, intraabdominal,
etc. xenobiotic introduction in organism. In the absence of MPC it is possible to take
SNRL, ОДУ, temporary design parameter (standard).
Waste reference to danger class for E is carried out by calculation method on the basis of
index (K), characterizing waste danger degree during its environmental impact, calculated by the
sum of indexes of substances danger making a waste (further waste components), for E (К_i). List
of waste components and their quantitative content are defined by initial raw materials composition
and technological processes of its treatment or by results of the quantitative chemical analysis.
Waste components danger degree index (К_i) is calculated as concentration correlation of
waste components (С_i) with factor of its danger degree for E (W_i); danger degree factor of waste
component for E is the conditional index numerically equal to waste component quantity less which
it does not render environmental negative impact. Dimension of danger degree factor for E conditionally
is accepted as mg/kg.
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