Location: Trinidad and Tobago

Platform Design: Conductor Supported Platform

Key Features: 

  • 27m water depth
  • 4 well platform
  • 6.3m x 5.5m well configuration
  • Access to the platform is by boat transfer, via a landing platform and stairs
  • 3 off 36” load bearing conductors with 1 additional 30” central conductors

Background

In February 2017, we were asked to deliver a fast turnaround Sea Swift platform destined for the Iguana field, offshore of Trinidad and Tobago. The platform was to be located in an extremely seismically active region, which meant extra engineering would be required to ensure its robustness should seismic activity occur.

Solution

The platform was designed with three additional skirt piles in addition to the three load bearing conductors to maintain its integrity during any earthquake scenario. All the conductor/pile slots integrated into a single subsea structure designed to fit within the 45ft x 20ft cantilever skid envelope available on the on-site jack-up.

The topsides feature local power generation using Thermal Electric Generator (TEG) units. The feed gas for these units is taken from the produced gas and is then conditioned to allow it to be used as both an instrument gas feed and as fuel for the TEG units.

The platform also features a wellhead control panel and an integrated communication/control arrangement, with dual redundancy, which allows the platform to be controlled from the same control room used for the onshore gas receiving plant.

To deliver a swift solution, the platform was fabricated in Louisiana where it could be easily transported by barge to Trinidad. To make use of the vessels already on site and reduce costs, the platform was installed using a combination of the Well Service Rig 110, the small jack-up being used to drill the wells and a crane barge which was in the region and available at short notice.

Results

The fast turnaround project saw the platform installed in December of the same year, exactly 10 months after the purchase order was received. This provided the operator with a quicker route to first gas.

ESG Stats:

  • Zero LTIs
  • Conductor supported design created a reduction in steel requirements
  • Utilised already in-country jack-up and crane barge – creating savings on transport emissions
  • Onshore control system reduced requirement for offshore personnel trips