Subsea Infrastructure Development

Why It’s Not That Simple: The Brutal Truth About Drilling 3,000m Below Sea Level Namibia is on the edge of a transformative moment with the Venus discovery—a deepwater oil field hailed as one of the biggest offshore finds globally in recent years. But why hasn’t TotalEnergies made a Final Investment Decision (FID) yet? Let’s break it down with one cold, hard fact: > At 3,000 meters below sea level, subsea infrastructure must endure external pressure of over 300 bar (or 4,400 psi)— That's the equivalent of stacking the weight of 3 SUVs on every square inch of a pipe. To bring it closer to home: Your car tyre? Typically 2.2–2.5 bar. Venus subsea gear? Over 120x more pressure—non-stop, 24/7. And that's just the water above it. Now add: Reservoir pressures exceeding 15,000 psi Need for specialised alloys and advanced sealing systems 24/7 operational uptime with no room for mechanical error Has It Ever Been Done Before? Yes—but only a handful of ultra-deepwater fields globally have pulled it off, including: Brazil’s Pre-Salt Fields (Lula, Búzios – depths of 2,000–3,000m) Gulf of Mexico (Jack, St. Malo, and Tiber – 2,500–3,100m) West Africa (Girassol and Dalia in Angola – ~1,400–1,800m) The Venus project pushes these boundaries further due to: Greater depth High gas content in the region Technical complexity of subsea infrastructure Logistical challenges from a greenfield base in Namibia Why the Delay to FID? Because you only get one shot at getting this right. TotalEnergies is meticulously: Finalizing ESIA consultations Engineering infrastructure for extreme pressures Securing the right supply chain and partners Balancing cost, risk, and local content obligations The Bottom Line This isn’t just oil drilling—it’s extreme engineering under crushing ocean forces. Getting to FID on Venus means building systems that don’t crack, corrode, or fail in one of Earth’s most hostile environments. When Namibia finally hits first oil, it won’t just be a success story. It’ll be a technological and geopolitical milestone. #NamibiaOilAndGas #VenusProject #TotalEnergies #DeepwaterEngineering #EnergyTransition #FID #OilExploration #OffshoreEnergy #TLCNamibia #DaronNamibia #ExtremeEngineering #LocalContent #SubseaTechnology #AfricanEnergyFuture

McDermott has wrapped up another big one in Southeast Asia, delivering the full subsea scope for Shell’s FaS gas-field development offshore Sarawak. This project covered the F22, F27 and Selasih fields, a package that included transportation and installation of multiple pipeline segments, flexible pipelay, pre-commissioning of in-field lines, and the structural installation of three jackets and three topsides. But this isn’t just about putting steel in the water; it’s about execution discipline, precision offshore work, and navigating complex multi-field development in a tightly coordinated campaign. McDermott executed the entire scope using its heavy-lift and pipelay asset, the DLV 2000, showcasing its ability to manage large, integrated EPCI works in a challenging environment. More than one million safe work hours were recorded on this project, a milestone that reinforces why Shell continues to trust McDermott across global portfolios. For Shell, the FaS development strengthens Malaysia’s gas infrastructure and supports long-term production needs. For McDermott, it’s another chance to demonstrate offshore capability in Asia-Pacific, building on a long partnership with Shell and a history of delivering complex subsea installations worldwide. Behind the headlines of jackets, topsides, and pipelines lies the real story: the teams offshore and onshore who plan, engineer, lift, weld, test, and install, safely, efficiently, and with the kind of coordination these multi-asset campaigns demand. So here’s my question to the network: with integrated EPCI scopes like this becoming more common, are we looking at the future model for offshore development, where execution certainty, vessel capability, and long-term operator–contractor partnerships define project success?

A visual guide to the evolution of offshore infrastructure. The offshore energy sector demands specific engineering solutions for every depth and environment. This graphic perfectly illustrates the transition from onshore rigs to ultra-deepwater floating systems. Here is a breakdown of the key platform types shown: 1. Shallow Water / Fixed Structures 🔹 Land Rig: The baseline for drilling operations, located onshore. 🔹 Jacket Platform: A fixed steel frame structure piled into the seabed. Extremely stable and the standard for shallow water production. 🔹 Jack-Up Rig: A mobile drilling unit with legs that can be lowered to the sea floor, elevating the hull above the water surface. 2. Deepwater / Floating Production 🔹 Semi-Submersible: A floating platform supported by submerged pontoons. Its design minimizes wave motion, making it highly stable for drilling in rough, deep waters. 🔹 Tension-Leg Platform (TLP): Buoyant platforms vertically moored to the seabed with tensioned tendons. This eliminates vertical heave, allowing for dry trees (wellheads on deck). 🔹 Truss SPAR: A deep-draft cylindrical hull that provides excellent stability. The "truss" section reduces weight and cost compared to classic cylindrical spars. 3. Ultra-Deepwater / Storage & Offloading 🔹 FPSO (Floating Production, Storage & Offloading): A ship-shaped vessel that processes and stores oil. The image highlights two mooring types: Internal Turret: Allows the vessel to weathervane (rotate) naturally around the mooring lines in harsh environments. External Turret: Typically used in slightly calmer waters or for easier disconnect capability. 🔹 Drillship: A vessel designed with a drilling derrick through its hull. It uses Dynamic Positioning (DP) to stay on location without anchors, making it ideal for the deepest and most remote exploration wells. From the shoreline to the abyss, the engineering behind these assets is truly impressive. #OffshoreEngineering #OilAndGas #FPSO #Subsea #EnergyIndustry #Drilling #Deepwater

Procedures for Subsea Umbilical Installation in Deep Water Installing subsea umbilicals in deep water requires careful planning, specialized vessels, and strict adherence to industry best practices to ensure the integrity of the umbilical and avoid costly failures. The installation process follows these steps: 1. Pre-Engineering and Planning - Route Selection & Seabed Survey: Conduct detailed seabed mapping and geotechnical studies to determine the best route while avoiding hazards such as steep slopes, boulders, and existing infrastructure. - Dynamic Analysis & Tensioning: Perform simulations to determine catenary shape, touchdown points, and required tensions under different environmental conditions. - Umbilical Design & Verification: Confirm compatibility of the umbilical with subsea terminations, bend stiffeners, and other associated structures. - Risk Assessment & Mitigation: Identify potential risks such as free spans, and impact loads from installation forces. - Permit & Regulatory Compliance: Obtain necessary approvals from regulatory bodies and stakeholders. 2. Mobilization & Vessel Preparation - Installation Vessel Selection: A deepwater-capable DP (Dynamically Positioned) vessel with a dedicated umbilical carousel or reel is required. - Equipment Readiness: Vessel Tensioners & Lay System: Ensure appropriate tensioner capacity to handle umbilical loads. - ROV Readiness: Prepare ROVs for touchdown monitoring and subsea connection tasks. - Deployment Aids: Load bend restrictors, bend stiffeners, buoyancy modules, and bellmouths as required. - Spooling & Loadout: Ensure controlled spooling onto the vessel’s carousel under monitored tension to prevent twisting or damage. Verify umbilical integrity using pre-installation electrical and hydraulic tests. 3. Umbilical Installation & Deployment -Overboarding & Deployment Initiation: Attach the umbilical to the chute or VLS (Vertical Lay System). Gradually feed the umbilical through tensioners while monitoring for anomalies. Attach buoyancy modules (if required) for controlling touchdown loads. Controlled Laydown: - Lower the umbilical to the seabed at a controlled speed to prevent excessive tension or bending strain. - Use ROVs to monitor touchdown conditions and adjust deployment speeds. - Ensure designed catenary shape is achieved. - Mid-Line Buoyancy & Free Span Management: Deploy buoyancy modules in high-sloped areas or long free spans. Key Considerations for Deepwater Installation - Tension Monitoring: Real-time monitoring of top tension and seabed touch-down force is critical. - Vessel DP Stability: The DP system must maintain stable vessel position to prevent sudden movements that could damage the umbilical. - ROV Assistance: Continuous ROV observation is necessary for seabed interaction and tie-in verification. - Environmental Constraints: Wave heights, currents, and wind speeds must be within operational limits. #subsea #offshore #oilandgas

The Gulf Just Became Unavoidable in (AI) Global Data Routing The 2Africa cable—45,000 km linking three continents—just landed in the UAE via e&'s SmartHub. Du is bringing in the Singapore‑India‑Gulf system next. The Gulf is now moving from optional to default in east‑west routing. Dense interconnection means lower‑latency, more resilient paths between Asia, Europe and Africa—and cloud providers and AI training clusters care about milliseconds and redundancy. Three data points matter: 2Africa is a three‑continent system now landed into the UAE via a single SmartHub gateway. Competing telcos (e& and du) are both anchoring next‑gen systems, deepening the region’s subsea and landing‑station infrastructure. Subsea capacity and data centers are typically planned together, with cable projects often going in first and large DC builds following on an 18–24 month horizon. Watch for new cloud and AI infrastructure capex announcements in Dubai and Abu Dhabi over the next 4–6 quarters: The cables usually arrive first for a reason.

Subsea pipeline installation begins with detailed route surveys using sonar and ROVs to assess seabed conditions, identify hazards, and define the optimal alignment. #Engineering analyses then determine the pipeline design, coating requirements, and installation method. Pipes are fabricated and coated onshore for corrosion protection and stability before being transported to the lay vessel. Offshore, individual joints are welded, inspected using non-destructive testing, and field-coated to ensure integrity. Installation is typically performed using S-lay, J-lay, or reel-lay methods. Appropriate method is selected based on water depth, pipe diameter, and environmental conditions. Pipe tension and curvature are carefully controlled during deployment to prevent excessive stresses, with ROVs monitoring the seabed touchdown point. Once installed, the pipeline may be stabilized through concrete coating, trenching, or rock placement. Final tie-ins to platforms or subsea systems are completed, followed by cleaning, hydrostatic testing, and commissioning to confirm readiness for operation. 💬 Any gaps to fill? Kindly share in the comments. 📹: NEGM Marine 🔄: Useful? Like & Repost for Others Check Muhammad A. Dalhat for more #SubseaEngineering #CivilEngineering #OffshoreEngineering #PipelineInstallation #SubseaPipelines #EnergyIndustry #MarineEngineering #SubseaTechnology

𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗦𝗽𝗼𝘁𝗹𝗶𝗴𝗵𝘁: 𝗦𝗮𝗶𝗽𝗲𝗺 𝗦𝗲𝗰𝘂𝗿𝗲𝘀 𝗡𝗲𝘄 𝗕𝗹𝗮𝗰𝗸 𝗦𝗲𝗮 𝗘𝗣𝗖𝗜 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁....... As you may have already seen this week in the press.....the Italian Offshore Engineering giant Saipem has scooped up another project award - This time, its a $425 Million contract awarded by TPAO (Turkey Petroleum) to continue their work on the largest natural gas field in country - This is the well known Sakarya Gas Development located in the Black Sea. This award extends Saipem's involvement in the third phase of the project - The scope includes: EPCI of 3 additional offshore Pipelines (Circa 153km). Associated Subsea Infrastructure to connect the Goktepe Field into the Sakarya Phase 3 facilities. Offshore Execution managed by Saipem's Pipelay Vessels - Building on their existing presence in the basin. What's significant here? Evolving Infrastructure - The extension to link the Goktepe reserve into the main field amplifies both infrastructure complexity and Subsea integration needs. Market Signal - With continued Global uncertainty & shifting investment patterns, awards like this highlights the ongoing demand for Deepwater Engineering & Infrastructure works across both Key & Emerging regions. Projects like Sakarya are about long-term strategic capability, execution and sustainability of supply chains under evolving market conditions. As EPCi Contractors, Vessel Owners & Engineering teams line up for the next tranche of work, for me the differentiator will be proven delivery combined with local engagement & the ever present need for specialist Deepwater Engineering skillsets..... Always keen to hear what the network thinks of project awards - What does the continued momentum on Sakarya across Phase 3 & adjacent plays like the Goktepe extension signal to you around investment confidence in Deepwater Oil & Gas infrastructure? Equally, how do you see this influencing contractor strategies for 2026 & beyond? Let me know your thoughts? #Sakarya #Saipem #BlackSea #SubseaEngineering #Deepwater #ProjectDelivery #EngineeringLeadership 

Overview of Subsea Production Systems ⚙️🌊 Subsea production systems are a critical part of offshore oil and gas operations. These systems, installed on the seabed, control the flow of hydrocarbons from the reservoir to surface facilities such as production platforms or FPSOs (floating production storage and offloading units). Each subsea component plays a vital role in ensuring safe, efficient and environmentally responsible hydrocarbon production. 🔹Main components of subsea production systems 🔹 Sabsi trees (17 d) Also known as Christmas trees, they are installed on top of wells to control the flow of oil and gas. They regulate pressure, monitor well conditions, and allow chemical injection or gas lift. 🔹 Subsea Manifolds (17P) Combine production from multiple wells and distribute flow via flow lines. It helps improve production by balancing good flow rates. 🔹 Workover Riser (17G) Connects subsea wells to surface vessels during intervention or maintenance. Enable access without heavy lifting. 🔹 Undersea Controls (17F) Providing remote monitoring and control of valves, sensors and actuators. Essential for safe and efficient undersea operations. 🔹 The Navel Under the Sea (17E) Packages of hydraulic lines, electrical cables and chemical injection lines. They deliver power, control and real-time monitoring of seabed equipment. 🔹 HIPS - Integrated High Pressure Protection System (17O) A critical safety system prevents excessive pressure in pipelines. Automatically shuts off flow when abnormal pressure is detected. 🔹Flexible pipes (17B, 17J, 17K, 17L1, 17L2) Transporting oil, gas and liquids from the seabed to surface facilities. Designed to withstand waves, currents and dynamic marine conditions. 🔹 Pile roof (17W) Emergency safety device used to shut down a well during blowout or uncontrolled flow. 🔹ROVs & Subsea Tools (17H) Remotely operated vehicles perform inspections, maintenance and repairs in deep waters where divers cannot operate. 🔹Flux and jump line connectors (17R) Connect subsea trees, manifolds, and flow lines, enabling efficient fluid transfer. 🔹Subsea Structures (17P) Include formwork, foundations and protection frames that support and protect subsea equipment. 🔹 General requirements (17A) Industry standards and best practices governing subsea system design, installation and operation. 🔄 Submarine flow process 1️⃣ Extraction - flow of hydrocarbons from the reservoir through undersea trees 2️⃣ Assembly - Compact and balanced in subsea manifolds 3️⃣ Control - managed remotely via undersea control systems 4️⃣ Transportation - Transportation to surface facilities via flexible pipes 5️⃣ Monitoring - continuous data via the navel 6️⃣ Safety - HIPPS and roof stacks provide protection in emergency situations 🌍 Why Subsea systems are important ✅ COST EFFICIENCY - Reduces the need for large surface installations ✅ HIGH SAFETY - Designed for extreme pressure and temperature situations ✅ ENVIRONMENTAL PROTECTION

2026: Subsea Engineering Moves to the Center of Offshore Energy Global offshore momentum is shifting - and subsea engineering is now at the center of value creation. As we move toward Q2 of 2026, several structural signals are converging: - • Deepwater project sanctions are accelerating globally • Subsea tiebacks are increasingly favored over standalone FPSOs • ROV/ AUV capabilities are expanding into deeper, more complex environments • Electrified boosting and advanced flow assurance are reducing lifecycle risk • IRM backlogs are strengthening across key offshore regions Operator activity confirms this shift. Major awards from leading players such as #SaudiAramco and #Shell reinforce long-term subsea commitments across the Middle East and the Gulf of America. The strongest forward signal, however, is the U.S. deepwater resurgence. The Gulf of America continues to produce ~2 million barrels per day, with next-generation HPHT developments such as Shenandoah moving into execution. These projects highlight a broader trend: technically demanding reservoirs where subsea architecture determines economic viability. What does this mean? Subsea infrastructure - not drilling alone - will define production growth: - • High-spec CSV utilization is tightening • IRM demand is expanding • Digital subsea monitoring is becoming standard • Multi-role vessels are enhancing offshore fleet resilience. This is a disciplined cycle - driven by execution, not excess. The organizations that will lead are those that can: - ✔ Execute reliably in deepwater environments ✔ Integrate engineering, technology, and data ✔ Structure disciplined project financing ✔ Scale efficiently across offshore basins. Subsea engineering is no longer a supporting function while it is the core enabler of offshore production, capital efficiency, and long-term value. For Horizon Offshore Services, 2026 will not be just another offshore year - it will define the next era of offshore value creation. It will mark the point where subsea engineering becomes the dominant driver of offshore energy. #SubseaEngineering #Deepwater #OffshoreEnergy #GulfOfAmerica #EnergyMarkets #IRM #ROV #AUV #OffshoreInfrastructure #MaritimeTransportation #OilandGas #OffshoreMarketResearch