Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ”
open joint-stock company
FS «Complex development of Surgil field
with extracting of valuable components»
behavior;
• EGE-2 soils are recommended to be removed due to their physical-mechanical properties
particularly due to unevenness of limestones spreading and thickness as well as for
marlaceous and argillaceous deposits dilatation;
• EGE-1 and EGE-2 soils are recommended to be changed for artificial soil compacted to
get the value of the soil skeleton’ volume weight equal to 1.85kg/cm 3 . Artificial filled soil
should be taken out from Kungrad city area;
• as the foundation soils EGE-3 soils (limestones with interbeds of marls and argillas) are
recommended for use.
Recommendations on construction in winter:
• Depth of foundation should be accepted taking into account the depth of seasonal frost
penetration into the earth.
2 ECOLOGICAL ANALYSIS OF TECHNOLOGY CONCERNING SITE’S PROBLEMS REVEALED
The project of Complex development of Surgil field with extracting of valuable components
includes UGCC construction. Earlier when elaborating DEI project this GCC was called Akchalak GCC
for convenience and nowadays it is UGCC.
All engineering objects have 72ha site to be arranged properly. As the raw stock for UGCC
operation they will use natural gas from Surgil and Eastern Berdakh gas condensate fields. Average
potential content (g/m 3 ) of methane homologues in formation gas of the fields is: ethane (C2) – 54.0;
propane (C3) – 36.3; i-butane (C4) – 8.33; n-butane (C4) – 9.67; C3+C4 fractions – 54.33; C5+higher –
44.24.
Fields’ natural gases are carbonic-hydrocarbonic, light according to hydrocarbons composition
with minor content of carbon dioxide – 0.79% and nitrogen – 1.12% and with no hydrogen sulfide.
Content of methane is 90.2%.
After extracting of valuable components they obtain purified and dry sales gas in amount of 3.8
billion cubic meters annually, 2.34 billion cubic meters will be supplied into the gas-main pipeline.
The brief description of UGCC process plants are below:
Gas receiving plant (Zone 100)
Two feed lines from Surgil and Eastern Berdakh are combined before GSP B.L. to provide stable
operation of GSP.
Feed gas being supplied to GSP will contain liquid hydrocarbons. Gas receiving plant is to
separate liquid hydrocarbons from feed gas. It consists of the Feed gas filter separator where liquid
hydrocarbons are stripped from feed gas and routed to a tank. In order to provide necessary pressure
level there are Feed gas compressors. Compressors are to have Gas turbine drive.
Compressed feed gas is further sent to MRU.
Book 5. Declaration of environmental impact concerning UGCC construction
14