Surgil ESIA Report - Volume III - EKN

“Management of Ustyurt GCC infrastructure objects
and Surgil GCF construction” UE »
Drilling cuttings composition after neutralization and hardening is presented in table P5.1.
Table P5.1 – Drilling cuttings composition after neutralization and hardening by 3 rd variant
Component name Content, %
1 2
Ca(OH) 2 64.0
Oil products 12.0
Inorganic clay part 2.0
Liquid glass 12.0
Water 10.0
TOTAL 100
According to O'zRH 84.3.8.2004 “Method of the integrated assessment of wastes danger”
and the Wastes qualifying catalogue, neutralized drilling cuttings will concern to IV danger class –
low-hazard waste.
Similar researches have been carried out on drilling cuttings selected in the North Berdakh
and East Berdakh fields. By results of researches of oil-containing drilling cuttings of the Surgil,
North Berdakh and East Berdakh fields there have been drawn the following conclusions:
Results of the chemical analysis of the drilling cuttings of three various fields of Ustyurt region
have shown that drilling cuttings humidity and oil products content depends, in particular,
on clay type and composition in each separate field which define its sorption property to
oil products absorption and to moisture separation.
Results of research of various variants of drilling cuttings neutralization allow drawing a
conclusion that treatment by calcium-containing reagents provides conversion of drilling
cuttings to leaving of IV danger class irrespective of chemical compound. For prevention of
the following washing-outs of the binding oil products from leaving and reduction of neutralized
leaving humidity there is used introduction of silicates in the form of liquid glass.
Important condition of maintenance of efficiency of oil-containing cuttings neutralization is
calculation of required and enough water amount with a glance of free and binding water in
cuttings. Water volume should provide binding of calcium-containing reagent and formation
of paste-like mass with the minimum free water content that promotes decrease in hardening
time.
Optimum quantity of entered calcium-containing reagent, water and liquid glass depends on
drilling cuttings chemical compound and should be defined in each concrete case on the basis
of data of the laboratory researches.
Therefore, further, it is recommended for each concrete well of Surgil, North Berdakh and
East Berdakh, prior to the beginning of work on oil-containing drilling cuttings neutralization there
is necessary to carrying out of laboratory analyses on each concrete well.
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