Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
There are passes 7 loops to the incoming-line unit of Surgil CGTU from wells and
three collectors from gas gathering stations. There is provided protection of loops from
pressure excess (Drain Safety Spring Valve plant) and purging of loops and collectors on a
torch.
Humid natural gas from GS is distributed through technological lines of LTS plant
and come into separator of first step S-101 where at the expense of centrifugal forces the
great bulk of liquid and mechanical impurities are separated from gas (figure 6).
After separator S-101 unstripped gas turned to tube space of recuperative heat
exchanger T-101 where it is cooled by upstream of the treated gas.
From heat exchanger T-101 unstripped gas come into separator of second step S-102
for separation of the liquid phase allocated during gas cooling in heat exchanger T-101/1. 2.
After separator S-102 unstripped gas turned to tube space of the second recuperative
heat exchanger T-102 where it is cooled by cold upstream of the treated gas.
There feeding RDEG by 80% of mass concentration in each section of heat
exchanger T-102 for prevention of hydrate formation in humid natural gas stream.
From heat exchanger T-102 gas come into separator S-0 for separation of the liquid
phase allocated during gas cooling in heat exchanger T-102. and prevention of dropping
liquid ingress in turbo-expander.
After separator S-0 unstripped gas turned to turbo-expander where gas is expand up
to pressure 5.0MPa. Thus, the temperature of treated gas drops to minus 10 0 С.
There feeding RDEG by 80% of mass concentration on input of turbo-expander for
prevention of hydrate formation in humid natural gas stream.
Cooled gas-liquid stream come into low-temperature separator of third step S-103
where gas is separated from waterlogged DEG and from hydrocarbonic condensate.
Stripped and dry gas from separator С-103 consistently passes hole annulus of
recuperative heat exchangers T-102 and Т-101. heats up in them by direct gas stream. Then,
gas come into turbo compressor, located on one shaft with turbo-expander where
compressed up to pressure 5.5MPa and through measuring assemble is transported to gas
pipeline.
The assembly of self-supporting gas measuring is intended for the commercial
account of the dry gas supplied to the main gas pipeline. There is also provided gas fuel
reduction in the given area for maintenance of the fire regenerator, torch, boiler house
(auxiliary).
Volume 2. Part 1. EIS Project for Surgil field construction
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