Production optimisation specialist, Enpro Subsea, has recently completed another two successful subsea hydraulic intervention campaigns for two operators in West Africa. Operations were conducted from a single Multi Services Support Vessel, which was mobilised out of Takoradi in Ghana.
The first of the two campaigns saw Enpro’s Flow Intervention Services (FIS) team deliver scale squeeze operations on five separate subsea wells via a modified choke insert in 1,800 metre (6,000 foot) water depth. The second campaign utilised the same vessel and hardware and included acid stimulation operations via a hot stab connection onto a further five wells at 1,300 m (4,200 ft), for a different operator.
These two back to back campaigns further enhance the track record for Enpro Subsea’s FIS technology, which has delivered safe and effective enhanced production solutions to 19 wells in the last two years. This was achieved with zero accidents or Loss Time Incidents (LTIs).
In 2017, the Aberdeen headquartered company first supplied its FIS hydraulic intervention package into the region. The system provides the capability to transfer the stimulation treatments from a vessel’s pumps to the subsea well via an integrated deployment and subsea safety system – the Subsea Safety Module (SSM) – which sits on the seabed and connects to both the downline and adjacent XT or manifold via a composite pipelines. This first-generation 10,000 psi rated solution, designed for air freight and to service the maximum well stock has been deployed from a range of vessel types, offering the operator maximum flexibility.
Steve Robb, Enpro Subsea operations director says, “This represents another two very successful campaigns for our FIS team. Over the past two years, we’ve worked with our stakeholders in region to optimise the mean time per well operation and improve efficiency of mobilisation and demobilisation. All activities, including mobilisation, deployment, subsea operations, demobilisation and maintenance are executed by the Enpro team. With the success of 19 FIS operations in West Africa under our belt, we are now well placed to deliver these services to others in the region and beyond looking for a low-cost hydraulic intervention solution.”
Following the success of the 10,000 psi FIS system in Ghana, Enpro showcased its second generation 15,000 psi version at Offshore Europe 2019 in Aberdeen before sending it to the Gulf of Mexico region for further trials. Rated for 3,048 m (10,000 ft) water depth, it encompasses additional functionality and enhanced safety features. In addition to hydraulic intervention of the wells, the new system is configurable for other subsea treatments, including hydrate remediation, flow line flushing and well kill.
As well as its FIS system, Enpro Subsea has seen the region adopt its patented Flow Access Module (FAM) technology. FAM provides a “USB” within the subsea jumper envelope which is currently being used for both multi-phase and single-phase metering. The same FAM flow access hub can also be used for hydraulic intervention in the future.
Ian Donald, Enpro Subsea CEO adds, “We are very pleased with our success in West Africa. We have now established Enpro Subsea Ghana Limited, a local joint venture, which will allow us to expand operations in the region, continue to support existing and new clients, and maximise the local content of these projects.”