Monopile Wellhead Platforms

Monopile wellhead platforms are a fast track, low risk and economic solution to developing marginal fields in benign and shallow water environments.

Monopiles offer development flexibility with a design that combines the CAPEX and OPEX advantages of a lightweight normally unmanned installation (NUI) with the fast track and local fabrication benefits of a minimal structure. In shallow water applications, this widely used technology helps operators achieve low engineering, construction and installation costs and an accelerated schedule to first oil or gas.

Depending on the metocean conditions and water depth, a monopile can be based around a standard well conductor with mechanical connectors. In this arrangement, a freestanding conductor supports a lightweight topside deck and the required surface equipment. When the wave loading is high, or in otherwise high fatigue environments, a subsea structure and skirt piles may be needed. Skirt piles can be used for future well slots supporting later conversion to a conductor supported platform (CSP).

Where the environmental conditions are more extreme or the topside requirements greater, a large diameter caisson can be used to host multiple wells and support the topsides.

The installation of the substructure and topsides make use of regionally available vessels and, depending on the configuration, may be installed using either a jack-up rig or a construction barge.

2H Offshore will help determine the best solution for your development, accounting for environmental conditions, deck facilities, weight and future expansion plans.

Key Services

Concept & FEED

• Feasibility assessment and concept design
• Preliminary system analysis and engineering
• Preliminary facilities engineering and functional requirements

Detailed Engineering & Design

• Detailed structural design and analysis
• Process and facilities engineering and design
• Equipment specification and interface management
• Conductor stability and strength analysis
• Detailed component design and analysis
• Pile foundation design and drivability assessment
• 3D modelling and simulations

Procurement & Logistics

• Requisition preparation
• Technical and commercial bid evaluation
• QA/QC witnessing and support
• PO management and expediting

Fabrication

• Project management and execution services
• On-site personnel for fabrication management including QA/QC
• Technical support to expedite resolution of site technical queries
• Load-out and transportation procedures
• Inspection and test planning (FAT/EFAT/SIT)
• Pre-commissioning and commissioning

Installation

• Transport and installation engineering, and analysis
• Seafastening and grillage design
• Tailored procedures to suit installation constraints and clearances
• Development of lifting and skidding practices acceptable to contractor
• Detailed installation procedures, schedules and budgets
• Full conductor installation services
• Offshore installation activity management

Transport & Installation Vessel Contracting

• Vessel specification, review and selection
• Vessel contracting and management

Integrity Management

• Development of integrity management plans
• Structural evaluation and recommendations
• Structural monitoring recommendations and supply

Verification

• Review and validation of existing designs, fabrication process and installation method
• Structural evaluation and recommendations