MacCulloch - North Sea Producer FPSO (Annex E Data)

  CAPACITY INFORMATION
 

5 YEAR OIL ULLAGE

Key
- - - - - < 5%
- X X - - 5-25%
- - - - - > 25%
 
  Entry Specification

The entry specification for any future third party production is dependent upon the point at which such production would enter the MacCulloch facilities and the composition of production already being processed on the North Sea Producer at that time.

The entry specification will cover areas that affect onward transportation as well as those which impact the North Sea Producer platform itself e.g. slugging limitations and contaminants.

 Exit Specification

Liquids – Any liquids processed on the North Sea Producer would be transported through the pipeline to Piper B and on to the Flotta terminal. The exit specification from the North Sea Producer is the pipeline entry specification, which is directly negotiable between any prospective user and the pipeline operator. However, any exit specification must be achievable with the processing facilities available on the North Sea Producer.

Gas – Any gas processed on the North Sea Producer would be transported through the pipeline to Piper B and on through the Frigg pipeline system to St Fergus. The exit specification from the gas terminal is the National Transmission System entry specification at that point.

  Primary Separation

The primary separation system on the North Sea Producer consists of a 3-phase first stage Separator followed by a second stage Separator. There is also a Test Separator.

Gas from the first stage and Test Separators is routed to the compression and gas treatment facilities, which are described below. Gas from the second stage Separator is routed to flare.

Produced water from the first stage Separator is treated in the North Sea Producer produced water handling system prior to discharge overboard.

Hydrocarbon liquids from the second stage Separator is treated in a coalescer, fiscally metered and pumped into the oil export pipeline which transports the liquids to Piper B and on to Flotta.

  Gas Treatment

Gas from the primary separation systems is routed to the gas treatment system.

The gas treatment system has 2 identical reciprocating compressors and the incoming gas is split equally between them.

The gas is recombined after the second stage of compression and routed to the TEG Contactor where it is contacted with TEG (Tri-Ethylene Glycol) in order to dehydrate the gas to the required specification.

The gas then is split to the third stage of the two compressors.  Gas is exported into the Gas Export Pipeline. This is a dedicated pipeline transporting gas from the North Sea Producer to Piper B. From Piper B the gas goes on into the Frigg system and on to St Fergus.

  Oil Export Capacity

The design capacity of the North Sea Producer Oil Export system is 60,000 bpd based on the capacity of the pipeline to Piper B.

  Gas Compression Capacity

The capacity of the gas compression system 24 mmscfd and is governed by the design of the reciprocating compressors.

In terms of mass capacity, compression capacity on North Sea Producer could be marginally increased by increasing the suction pressure and improving suction and interstage cooling.. Increasing suction pressure would back out MacCulloch production.

ConocoPhillips continuously seeks to maximise field deliverability by maximum use of gas lift. Given this mode of operation, there is effectively no ullage in the export gas compression system.

However, export gas compression capacity can be increased by installation of an additional compressor.

  Gas Export Capacity

The maximum North Sea Producer gas export capacity is defined by the   compressor capacity to 24 mmscfd.

It would be possible to upgrade this capacity through installation of additional compression.

  Gas Lift Capacity

Gas for gas lift is supplied from the discharge of the compressors at approx 160 bar.

Because lift gas is supplied from the compression system, the same capacity and back-out issues arise as mentioned above.

  Produced Water Handling Capacity

The design capacity of the produced water handing system on the North Sea Producer platform is currently 100,000 bpd.

This does not take account of the OSPAR regulations. The capacity of the revised produced water system, which will comply with OSPAR, has not yet been determined but is unlikely to exceed the original design capacity of the system.

The ullage available in the system is < 10%.

  Dehydration Capacity
The gas dehydration system is between the second and third stage of the gas compression system and the capacity of the system is similar to that for gas compression.
  H 2 S Removal Capacity
The North Sea Producer has no H 2 S removal facilities. The North Sea Producer facilities were designed for a maximum H 2 S content of 100 ppmv.

  Water Injection Capacity

The North Sea Producer has water injection capability of 72,000 bwpd.