SUBSEA REPAIR & MAINTENANCE

Geo Oceans has a wealth of experience in completing subsea maintenance, repair and cleaning services using a fleet of Mini-ROV observation class systems equipped with a range of custom tooling.

Geo Oceans integrate state-of-the-art cameras, sensors and manipulator technology onto small, powerful and agile Mini-ROVs to provide capabilities traditionally only possible when using large work class ROVs or divers, which also require costly dive support vessels.

Our small ROVs are quick, efficient and cost-effective to mobilise, can be manually deployed from vessels, offshore platforms or port infrastructure and can operate in challenging weather conditions around the clock.

To support repair and maintenance plans we use photogrammetry or laser technology to create accurate 3D models and point clouds of subsea objects for accurate size and volume measurements. We then quantify deviation against as-built drawings and models, such as corrosion or damage, or design objects for manufacture. Some of our subsea repair and maintenance services include:

  • Deployment of subsea tooling
  • Rotary brush cleaning
  • Mechanical chippers and cleaning tooling
  • High pressure water blasting
  • Laser scanning, 3D modelling
  • Actuators & five function Manipulators
  • Hull penetration plug installation
  • Construction Support
  • Full site of inspection & NDT systems to assist in quantifying repair plans and integrity

PROJECT EXAMPLES

FPSO Penetration Isolation - Okha FPSO

Geo Oceans used a Mini-ROV system to insert a pneumatic plug to allow isolation of boiler blowdown valve that needed replacement. The plug was inserted into a 50 mm diameter penetration and the valve was replaced in 6 hours, with minimal disruption to the facility. The ROV control station and LARS was setup in the store’s laydown on the FPSO vessel, delivering significant cost savings compared to traditional methods.

Mini-ROV Pipeline Maintenance Support

Geo Oceans used multiple Mini-ROV systems to support a subsea pipeline repair, replacement and remediation campaign. Using multiple ROV systems, actuators and custom designed tooling with an ROV control station deployed from a vessel of opportunity, the project was completed on time, under budget and with a perfect safety record.

Mooring Chain Cleaning, Assessment & Modelling

Geo Oceans was engaged to use Mini-ROV inspection and maintenance systems to complete a full assessment of all mooring chains. The scope of work included high-pressure water blasting, brushing and cleaning, dimensional checks, HD visual inspection, 3D modelling and photogrammetry.

FPSO Hull and Mooring Chain Cleaning & Preparation

Geo Oceans and Vertech demonstrated the capabilities of the ROV system for cleaning and maintenance services on an offshore FPSO. The hull was heavily fouled, so physically attaching the ROV system to the hull was required to provide a stable platform for cleaning. The ROV vessel inspection system included hull attachment tools for stabilisation, HP and mechanical cleaning tools, such as scrapers and brushes, CP and UT sensors, sonar for navigation, laser profiler and caliper tools for chain link measurements.

FPSO Hull Outer Shell Mini-ROV HP Blasting

Geo Oceans used an ROV system on one of the world’s largest FPSOs to clean subsea welds, sections of the hull envelope and other features for the purposes of inspection. The Mini-ROV system included hull attachment tools for stabilisation, HP and mechanical cleaning tools along with various conventional and advanced inspection tools. All areas of interest had all marine growth removed through high-pressure water blasting and brushing with no damage to the coating system.

Mini-ROV J Tube & Structural Marine Growth Cleaning

Geo Oceans planned and executed a complex Mini-ROV advanced NDT scope on FPSO riser turret mooring J-tubes offshore of Western Australia. The scope included extensive high-pressure water blasting to remove 20 years of marine growth from each riser section, box section and other features prior to CVI inspection (HD video), ACFM inspection of welds and circumferential C-scan corrosion mapping of the J-tubes. The project was a major success and illustrated the dynamic cleaning, maintenance and overall inspection capabilities of these systems.

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