Objectives
• Taqa required support for a subsea wellintervention campaign in the Dutch sectorof the Southern North Sea to:
– establish if sustainable productionfrom the well could be reinstated and if not, prepare the well for a future abandonment programme
– conduct a variety of interventions ranging from wireline fishing, to water shut off, re-perforating, and well testing
• In line with Taqa’s existing contractingframework, Expro were appointed leadcontractor to both modify the vesselready for subsea well intervention andmanage a well services alliancecomprising Expro, BJ Services andBakerHughes
• Taqa identified that a self-propelled liftboat could be modified to performshallow water subsea well intervention,however the vessel selected for thiscampaign was not equipped with a moonpool, and required a cantilever for thisoperation
Expro Excellence
• Key to achieving well re-entry was thefabrication of a cantilever deck that couldbe skidded over the top of the subseawell to form the work platform forintervention equipment
• A cantilever deck was designed andmanufactured by Expro – a primaryfeature was its ability to index throughnine positions to centre itself over the well
• Over a 14 day period, project-specific rigvessel modifications were undertaken topre-install well service equipment,comprising surface well testing, coiltubing, e-line and slickline packages, thisalso included the installation of flarebooms on the port and starboard sidesof the vessel
• Once on location a riser was installed andthe well intervention began with wellinspections using Expro’s slicklineservices to establish if the wells wereclean of debris from surface to thereservoir – the slickline was used torecover the fish and mechanical plugspreviously installed in the well
• Wireline was used extensively throughoutthe project using Expro’s combined e-lineand slickline units to minimise number ofcoiled tubing operations
• The first well required milling to clearblockages in the tubing and a cementplug to be set on top of a mechanicalbridge plug
– The programme also called for production logging and then additional perforating
– In order to clear a restriction in thewell, the tail pipe was cut off using an Expro radial cutting torch
Value to client
• Improvement in productivity following thesuccessful intervention of three wells
• Significant savings – avoided the need fora jack-up rig or intervention vessel
• Single project manager on multi interfaceproject – high operational efficiency
• Fast track delivery using vessel ofopportunity with custom modifications
ContactFor further information, pleasecontact:
Kevin Illingworth Global Well Abandonment ManagerWell Intervention
www.exprogroup.com/wellintervention
Well Intervention
/ Expro Excellence
Lift boat equipped with cantilever deckfacilitates cost effective shallow watersubsea intervention
Well Intervention
Expro E x c e l l e n c e exprogroup.com
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