Please enable JavaScript for this site to function properly.
OnePetro
  • Help
  • About us
  • Contact us
Menu
  • Home
  • Journals
  • Conferences
  • Log in / Register

Log in to your subscription

and
Advanced search Show search help
  • Full text
  • Author
  • Company/Institution
  • Publisher
  • Journal
  • Conference
Boolean operators
This OR that
This AND that
This NOT that
Must include "This" and "That"
This That
Must not include "That"
This -That
"This" is optional
This +That
Exact phrase "This That"
"This That"
Grouping
(this AND that) OR (that AND other)
Specifying fields
publisher:"Publisher Name"
author:(Smith OR Jones)

Shetland Gas Plant - Effluent Water Treatment

Authors
Rachael Ferguson (Total E&P UK) | Brian Milne (Total E&P UK) | Oliver Bradshaw (Total E&P UK) | Simon Hare (Total E&P UK) | Cathy Fuchs (SUEZ Eau Industrielle)
DOI
https://doi.org/10.2118/186140-MS
Document ID
SPE-186140-MS
Publisher
Society of Petroleum Engineers
Source
SPE Offshore Europe Conference & Exhibition, 5-8 September, Aberdeen, United Kingdom
Publication Date
2017
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-540-2
Copyright
2017. Society of Petroleum Engineers
Disciplines
4.1 Processing Systems and Design, 4.2 Pipelines, Flowlines and Risers, 4 Facilities Design, Construction and Operation, 4.1.2 Separation and Treating, 4.2 Pipelines, Flowlines and Risers, 5.2 Reservoir Fluid Dynamics
Keywords
Effluent Water, Shetland Gas Plant, Water Treatment
Downloads
2 in the last 30 days
151 since 2007
Show more detail
View rights & permissions
SPE Member Price: USD 9.50
SPE Non-Member Price: USD 28.00
Abstract

The Shetland Gas Plant (SGP) is a 500 MMSCFD capacity gas plant located at Sullom Voe on the Shetland Islands. It receives reservoir fluids, via twin 143km multiphase flowlines, directly from the Laggan-Tormore fields which are located 125km north-west of the Shetland Islands in approximately 600m water depth.

Fluids arriving at the SGP are separated into gas and liquid phases. The gas is processed and then exported to St Fergus gas processing plant via the SIRGE and FUKA pipelines. The liquid phases are separated and the condensate is exported to the BP Sullom Voe facility for stabilisation and export by tanker. The aqueous phase (rich MEG) is regenerated at SGP to produce lean MEG for reinjection subsea, a by-product of the regeneration process is produced water.

The produced water is then fed to the Effluent Water Treatment Plant (EWTP) for processing prior to being discharged to Yell Sound via a 3.75km pipeline. The effluent water treatment package was designed by SUEZ Eau Industrielle (patented design). The effluent water is required to meet strict discharge specifications as part of the operating consents, e.g. Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), MEG, Benzene, Total Suspended Solids (TSS), etc.

The Effluent Water Treatment Plant (EWTP) consists of 3 stages of treatment: physical, chemical and biological.

The physical treatment contains;

–

A Corrugated Plate Interceptor, which uses gravity to separate the free oil from the produced water;

–

A Stripping Column, which removes BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) and volatile hydrocarbons entrained in the water via transfer to fuel gas.

The chemical treatment contains;

–

A Dissolved Air Flotation Treatment Unit, to remove any residual free oil and TSS utilising flocculants and coagulants.

The biological treatment contains;

–

A Biological Aerated Flooded Filter (BAFF) Unit, which is an aerobic biological filtration process whereby a biomass (bacteria) give biological degradation of soluble organics while simultaneously removing suspended solids via filtration. The biological process removes the remaining MEG and BTEX and has the ability to handle varying loads of COD and BOD.

The EWTP has been in operation since the start up of the SGP in February 2016.

The paper will discuss:

–

The initial challenges faced during start up and the first year of operation and how these were overcome;

–

Current operation of the process including ongoing challenges and areas of success.

File Size  1 MBNumber of Pages   12

Ondeo IS. EWTP - Control and Safeguarding Narrative. s.l. : Ondeo IS, 2014.

Other Resources

Looking for more? 

Some of the OnePetro partner societies have developed subject- specific wikis that may help.


 


PetroWiki was initially created from the seven volume  Petroleum Engineering Handbook (PEH) published by the  Society of Petroleum Engineers (SPE).








The SEG Wiki is a useful collection of information for working geophysicists, educators, and students in the field of geophysics. The initial content has been derived from : Robert E. Sheriff's Encyclopedic Dictionary of Applied Geophysics, fourth edition.

  • Home
  • Journals
  • Conferences
  • Copyright © SPE All rights reserved
  • About us
  • Contact us
  • Help
  • Terms of use
  • Publishers
  • Content Coverage
  • Privacy
  Administration log in