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    Offshore Guyana Site Investigation


    • Published by: Benthic Admin
    • Aug 13, 2019

    Project Overview

    Following multiple discoveries off the coast of Guyana, the Client planned to install an FPSO with subsea tiebacks in water depths between 1,500 and 1,850 meters.  The Client engaged Benthic to conduct a geotechnical site investigation to acquire site specific geotechnical information to assist design of pipelines, risers, manifolds, FPSO anchor clusters and associated seabed infrastructure required to develop the field.

    Benthic’s PROD3 remote seabed drilling system and TDI box coring and piston coring systems were mobilized on board the Chouest Sable, a 93m x 19m, Dynamic Positioning Class 2 (DP2) offshore tug/supply ship in July 2018. TDI box coring and piston coring systems, which includes a main winch, main coring rope, a track and a stern A-Frame, used for deploying and retrieving the box core and piston core rigs were mobilized during a port call in Georgetown, Guyana, in August 2018.

    Benthic subcontracted TDI-Brooks International, Inc. (TDI) to carry out the shallow geotechnical investigation (up to 6m BML) and environmental baseline survey. NGI Houston (NGI) performed onshore laboratory testing and factual and interpretive reporting.

    Challenges

    Working in Guyana, an area only recently experiencing growth, presented initial challenges to Benthic in finding suitable ports due to the lack of typical infrastructure required for PROD mobilization and demobilization. Benthic overcame these challenges by using three different facilities in three different countries before commencing field work. The lessons learned and relationships developed working in Guyana proved valuable to Benthic and will improve our future success in the region.

    Solutions

    Three short months after the LOI was issued, Benthic shipped the PROD3 system from Ghana to Suriname and mobilized onto the Chouest Sable, before commencing operations in Guyana. Benthic rose to the challenge of meeting the Client’s strict schedule, arriving as planned and completing the work at record pace. Through collective collaboration with the Client and our local agent Ramps’ strong regional presence, we were able to minimize delays and organize effective logistics.

    Results

    Having worked primarily with drillships in the past, the Client was impressed by PROD’s advantages in deepwater, including increased weather operability and productivity and its inherent safety. The positive outcome from the site investigation and the collaborative relationship developed resulted in Benthic winning follow-on work in Guyana.

    A total of 133 locations were investigated, consisting of the following activities in water depths between 25m and 1,850m:

    • 1,167m of in situ Piezocone Penetration Testing;
    • 508m of Piston Core sampling (acquired with PROD);
    • 14 in situ Ball Penetration Testing locations;
    • 46 in situ Mini T-Bar tests;
    • 21m of Box Core sampling;
    • 61 m of Piston Core sampling (acquired by TDI); and
    • On board geotechnical laboratory testing.