Tui Decommissioning Project

Tui Field Decommissioning

Project Overview

The Tui Field is an offshore oil development located approximately 50km off the western coast of Taranaki, New Zealand. Production from the field ceased in November 2019, and Tamarind Taranaki Limited, the operator, went into liquidation in December 2019. In response, the New Zealand government allocated funding for the decommissioning of the Tui Field, with the Ministry of Business, Innovation and Employment (MBIE) taking the lead on this critical project. Nikau was commissioned to provide deconstruction sevices for the project.

Environmental Focus

The primary goal of the Tui Field Decommissioning Project was to achieve a 'clear seabed.' This involves the comprehensive recovery of all subsea equipment and the removal of wellheads. MBIE’s approach prioritises minimising environmental impact through recycling and reusing as much of the subsea infrastructure as possible.

Recycling and Reuse

During Phase 2 of the project, over 1,500 tonnes of subsea structures was recovered. These structures, composed of various materials including steel, aluminium, plastics, and concrete, pose significant challenges for reuse due to their age. However, this was all recycled. The project mains goal was to -

• Reduce Environmental Impact: By recycling materials, the project minimises waste and reduces the environmental footprint.
• Lower Logistics Costs: Efficient processing and recycling to significantly cut transportation and disposal costs.
• Support Domestic Recycling: The project fosters local recycling capabilities, contributing to New Zealand's sustainability goals.

Contractor Responsibilities

To achieve the project's objectives, the following key tasks are assigned to contractors:

• Heavy Transport: Transporting recovered assets to a designated laydown area for cleaning and recycling.
• Crane Works: Utilising Nikau's 300-tonne crane to lift and transport all assets to the laydown area.
• Ultra High Pressure Waterblasting: Cleaning assets to remove marine growth and prepare them for further processing.
• Deconstruction: Comprehensive dismantling of subsea assets from the Tui Field.
• Scrap Recycling: Recycling over 1,000 tonnes of ferrous metals recovered from offshore operations.
• Heavy Machinery Operations: Employing demolition equipment and heavy machinery for efficient deconstruction.

Project Challenges and Solutions

The Tui Decommissioning Project was unprecedented in its size and scope, presenting a range of common and unique hazards. Nikau’s team addressed these challenges by developing and implementing practical and achievable solutions. This approach ensured the project was carried out safely and successfully, adhering to both environmental and operational standards.

For more information on the Tui Field Decommissioning Project, please contact us