Subsea

Working in deep or ultra-deep waters is a challenge that can only be overcome with knowledge, technology and adherence to strict health and safety protocols. In addition to seabed mapping, subsea operations carried out by OceanPact supports subsea construction, inspection and decommissioning of offshore developments.

Geophysics

• Operation of – Survey Vessels

OceanPacts survey fleet is equipped with complete multibeam sonar systems for hydrographic surveys that assist in seabed mapping, a necessary element in the most varied offshore projects.

• Hydrographic surveys

The characterization of the seabed on the surface and sub-surface with bathymetric and geophysical surveys developed by OceanPact allows its customers to identify the relevant aspects for the development of their projects, from coastal areas to deep ocean areas.

• Pipeline routes survey

One of the most important steps in submarine pipeline and cable projects is the assessment of the route, which must be clear of any natural or anthropic obstacles. Geophysical surveys ensure that the route with the least geological and geotechnical risks is chosen, allowing minimal environmental impact to underwater habitats.

• Geohazards

The development of a petroleum field needs to consider all variables, including seafloor. and sub-surface. We offer high resolution seismic surveys for geological risks assessment for the choice of locations for the installation of wells and underwater structures. Geohazards include landslides, movement of faults or pockets of shallow gas.

• Detailed Seabed Survey

AUVs – Autonomous Underwater Vehicles are equipped with the latest technology that allow imaging of the seabed at larger depths with higher resolution.

• High resolution seismic surveys – HR survey

2D seismic surveying is the traditional method for assessing prospects in the petroleum industry. We carry out high resolution surveys that also assist the identification of geological hazards, such as gas accumulations near the surface (shallow gas).

Inspection, repair and maintenance

• Operation of ROV Support Vessels* (RSV)

OceanPact owns and operates ROV Support Vessels which for inspection and maintenance of submarine systems up to 3,000 meters water depth. Our vessels are also equipped with cranes and frames capable of carrying out positioning operations and supporting submarine construction.

• Operation of Shallow Diving Support Vessels (SDSV)

OceanPact owns and operates Shallow Dive Support Vessels for inspection and maintenance of submarine systems up to 50 meters. OceanPact’s SDSV, allows for diving operations directly from the vessel as well as from its daughter craft which has hydro jet propulsion system to ensure the safety of the divers.

• Asset Integrity

The life cycle of any submarine construction requires inspection, repair and maintenance services to ensure the integrity of the assets. OceanPact has a fleet of vessels, submarine vehicles and specialized equipment to carry out IRM work. We use non-destructive tests and anomaly detection techniques to avoid failures and improve asset lifespan.

• Pipeline and mooring line inspections

As part of the IRM service line, OceanPact provides inspection services for pipelines, mooring lines and their associated equipment.

• Repair and Structural Interventions

In addition to inspection services, Work Class ROVs are able to carry out interventions in physical structures using cutting, welding and dredging tools, amongst others, to repair submarine structures. Our vessels are also equipped with subsea cranes capable of handling submarine structures to support these interventions.

• Cathodic protection services

Cathodic protection (CP) tests help to assess whether the anodes that protect a subsea asset are still performing their function. Combined with visual inspections, this service helps to assess the extent of corrosion and predict the remaining lifespan of an anode system, while also making recommendations to correct corrosion problems.

• UWILD

We provide Underwater Inspection in Lieu of Dry-docking (UWILD) solutions for mobile drilling units (such as rigs), floating production units (FPSOs), as well as support vessels (such as PSVs and AHTSs), as well as tailored solutions using Mini ROVs, Observation-Class ROVs and Work-Class ROVs. OceanPact’s UWILD services are approved by leading Class Societies.

Geotechnics

• Operation of geotechnical vessels

Our geotechnical vessels are suitable to meet the different demands of the shallow and deep water markets. They are equipped with tools for in-situ testing and geological investigations, for pipeline routes and for different types of foundations.

• Geotechnical investigations

As with conventional onshore engineering, it is necessary to understand the physical parameters of the soil before installing any structure. Geotechnical investigations minimize the soil risk during underwater construction by determining the carrying capacity of the structures to be installed.

Geotechnical investigations carried out by the OceanPact team allow us to consolidate the characterization of the seabed, providing relevant information for the development of projects for foundations, pipelines and anchoring systems.

• Cone penetration test (CPT)

CPT test consists on the penetration of an instrumented cone into the ground to determine its resistance. Understanding the resistance of the soil allows predicting the load capacity and settlement of foundations.

• Piston Corer Sampling

Sampling with Piston Corer is ideal for recovering undisturbed cores of up to 12m from soft soils, such as clay and fine sand. This methodology is complementary to the CPT test, since it allows us to associate resistance variations with different types of soil according to the grain sizes.

• Box Corer Sampling

Box Corer sampling is a method for analysis of the most varied physical parameters of the soil up to the first meter below the bed. The equipment ensures that the collection is made with the least possible disturbance, for the preservation of the sediment characteristics, with subsequent testing on board.

• Vibro Corer Sampling

Collections undisturbed cores by the vibracore method are extremely relevant for the physical and chemical characterization of material for dredging, mapping of sand deposits or detailed stratigraphic description of the seabed. With the use of electric vibracore systems, there is no need for professional diving, making the activity safer and more efficient.

Construction positioning and support

• Operation of ROV Support Vessels* (RSV)

• Operation of Shallow Diving Support Vessels (SDSV)

• Positioning of drilling platforms – Rig Moves

Positioning of rigs and platforms are very sensitive and requires great precision. The positioning service with satellite transmission systems for correction differential data guarantees an accuracy of centimeters.

• Positioning of submarine structures

Submarine engineering operations require the placement of structures on the seabed,. For this, we use ROVs, vehicles operated remotely, which guarantee the positioning of all systems according to the previous calculations of the engineering design.

• Submarine metrology

After being positioned on the seabed, the underwater structures need to be connected to each other. For this, we offer the precision underwater metrology service so that pipelines and valves are custom-made to ensure their perfect fit.

• Seabed mapping

The mapping of the ocean floor is among the activities that we develop in support of submarine constructions, inspections and decommissioning. Our mapping services include bathymetry, sonography, magnetometry, as well as specialized environmental and engineering consultancy. To assure our customers can develop their offshore project with reliable information, our systems and sensors are designed to serve the entire spectrum of submarine imaging applications.

Decommissioning

Services

Subsea