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Offshore-advertentie-juni2014.indd 1 04-07-14 14:23

Dutch knowledge is called in when the going gets tough

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Future with healthy dose of tension

Revolutionary lifting equipment ‘Made in Holland’

Growing confidence in ‘Oleg Strashnov’

DP platform installation/

decommissioning and pipelay vessel

‘Pieter Schelte’

2014

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Schiedam-based engineering company KCI was selected because of their specific experience with similar offshore projects. KCI has integrated Jet Pumps (JPs) for condensate injection to export pipelines and also studied the concept of using Surface Jet Pumps for boosting gas in several projects. The concept selection of

using an eductor upstream for the L9 export compressor was made by NAM and was the starting point of the KCI study. KCI is also familiar with the L9 production system, from previous assignments by NAM.

PartnerSamira Nazeri, KCI’s Business Unit

Manager Oil & Gas, is extremely pleased that KCI has been awarded this project. “We are proud that NAM has chosen KCI as its engineering partner for this assignment. We know their requirements and the L9FF platform very well; we have designed the reception facilities on L9FF for the M7 monotower.”

Nederlandse Aardolie Maatschappij (NAM) is planning to extend and optimize the L9 production, located in the Dutch sector of the North Sea, and has contracted KCI for the detailed design of the L9 FF/FD back pressure reduction project. NAM is a 50/50 joint venture between Shell and Exxon Mobil. KCI already had early involvement in this project as NAM awarded the FEED study for this project to KCI last year.

Detailed design NAM L9FF Eductor project awarded to KCI

Surface Jet Pump (SJP)

Visual of eductor skid.

572014

L9 production systemThe L9 production system consists of the manned production platform L9FF together with three satellite platforms: L9-FA, L9-FB and M7 among which the last belongs to ONE (Oranje-Nassau Energie). The satellite platforms feed production to L9FF via a 20km 16” pipeline and a 10km 6” pipeline, respectively. The L9FF wells are currently producing via a 2-stage compressor. This compressor is driven by an 11 MW gas turbine and has a capacity of 2.5 to 3.0 million Nm3/d.

Flows and wellsA brief overview of the current systems and planned modifications:The wells at satellites FA/FB were producing in free flow. Subsequently they are being produced through a compressor, which could result in a back out of the FF wells. Also the M7 monotower is connected to the compressor.

In 2014 three new wells are being drilled at the FA satellite and will be produced in free flow through the 16” pipeline. It is expected that these wells are fully operational by 2015. At that moment the existing wells at FA/FB will no longer produce via the compressor and will be backed out due to the high pipeline backpressure. At that moment in time the compressor becomes available again for the FF wells.

SJP solves the problemTo prevent the FF wells from backing out in 2-3 years’ time, an eductor or technically speaking Surface Jet Pump (SJP) can be installed in the recycle of the compressor. An SJP uses the high pressure gas stream to boost a low pressure gas source and medium pressure gas can enter the compressor. In addition, an SJP requires little maintenance because it has no rotating parts, and it does not consume electricity. This concept has already been installed at NAM’s AWG (Ameland) platform where it operates to satisfaction.

The SJP on L9FF will become part of the overall gas production system. The L9FF platform already has a

compressor skid. The SJP skid, measuring (LxW) 10x7 m, will be placed on top of the existing compressor skid. KCI is currently working on the design of this skid in which the SJP, two silencers and piping will be integrated. Also the selection process for the skid fabricator and other materials has been started up.

Project challenges Defining the operating envelope of the eductor, the tie-in points, the dynamic process simulations, the interaction with the existing compressor, and the installation of the eductor itself, are just some of the engineering challenges KCI project manager Roland van de Watering and his team are working on together with NAM.

KCI project

manager

Roland van

de Watering.

Samira Nazeri,

KCI’s Business

Unit Manager

Oil & Gas, is

extremely

pleased that

KCI has been

awarded the

NAM project.

Overview of wellhead and

production platform.