Concept Study Wellhead Platform, Carnarvon Basin, Offshore Australasia
In 2021, ICON Engineering was engaged by an independent Australasian energy company to conduct a Concept Study for an unmanned wellhead platform. The engineering focused on developing a minimum facilities platform design that could be installed using the jack up drilling rig.
Top Deck – Hydraulic Workover Unit (HWU) layout schematic.
Project specific challenges included:
- Requirement for large top deck to accommodate a large hydraulic workover spread; and
- Platform crane design - Needed to be located to enable access to all well locations in addition to supply boat operations.
The ICON scope of work included the following deliverables:
- Platform Basis of Design and Functional Specification;
- Process and Utilities Definition, and Equipment List;
- Platform Layout – Topsides and Substructure.
- Platform Weights - Topsides and Substructure;
- Basic Workover Equipment Layout and Interfaces;
- Installation Methodology; and
- Platform Cost Estimate and Schedule.
Following the completion of this Concept Study the major features of the Platform were:
- Minimum facilities WHP topsides that incorporates all required interfaces including FPSO and well workover;
- Slim, vertical four-legged jacket that can be readily installed by the Jackup drill rig;
- Vertical drilled and grouted piles/well conductors– one inside each jacket leg, installed using the Jackup drill rig; and
- Large top deck and platform crane to accommodate the portable Hydraulic Workover Unit (HWU).
|Jacket Weight (excl. piles)
Platform Schematic for 400mT unmanned wellhead platform.