Offshore drilling operations conducted in water depths exceeding 1,500 metres. Subcontractors working these projects require specialised certifications, equipment ratings, and offshore survival training. Mobilisation costs and logistics complexity are significantly higher than shallow-water scopes.
Ultra-Deepwater
Related Terms
Debottleneck
IndustryTo identify and remove constraints limiting throughput or efficiency on a project or facility. For subcontractors, this often means mobilising additional crews or equipment to clear backlogs. Work is typically urgent and can command premium rates.
Closed-Loop Heat Exchanger
IndustryA sealed system that transfers heat between two fluid circuits without them making direct contact. Subcontractors service these units for cleaning, inspection, and pressure testing. They are common in oilfield facilities, compressor stations, and industrial construction sites.
Acre-Feet
IndustryA volume measurement equal to one acre of surface area filled one foot deep, roughly 1,233 cubic metres. Common in water management contracts for tailings ponds, frac water storage, and site remediation. Subcontractors may be scoped and billed based on acre-feet of material moved or treated.
Well Pair
IndustryTwo parallel horizontal wells — one injector, one producer — used together in SAGD (Steam Assisted Gravity Drainage) operations. Subcontractors are typically mobilised to service both wells as a single scope. Expect coordinated drilling, completions, and maintenance schedules across both wellbores.
Dekatherm
IndustryA unit of energy equal to 10 therms or roughly one million BTUs, used to measure and price natural gas volumes. Subcontractors working on gas facilities or pipelines will encounter this unit in contracts and billing documents. Knowing the conversion helps you verify measurement and invoicing accuracy on natural gas projects.
HTHA (High Temperature Hydrogen Attack)
IndustryA form of steel degradation that occurs when hydrogen penetrates metal at high temperatures, causing cracking and equipment failure. Subcontractors working on refineries or pressure vessels must verify equipment is rated for HTHA risk before beginning work. Inspection and repair scopes in affected units often require specialised NDE certifications and strict safety protocols.
Latest Industry News
Foresea Lands $465M Petrobras Drillship Contract for Ultra-Deepwater Campaign
Foresea has secured a $465 million contract from Petrobras to operate the ODN I drillship offshore Brazil, with work starting in early 2027 on a 1,443-day campaign supporting the Mero consortium.
3 months ago IndustrySonadrill Secures 480-Day Extension for Quenguela Drillship Offshore Angola
Sonadrill has locked in roughly 480 days of additional work for the ultra-deepwater drillship Sonangol Quenguela offshore Angola, keeping the rig contracted through June 2028 under a seven-well priced option exercise.
3 months ago IndustrySaipem's FlatFish Autonomous Drone Clears Final Testing, Heads to Deepwater Deployment
Saipem's FlatFish underwater inspection drone passed Functional Acceptance Tests with Petrobras and is now approved for deployment in Brazil's ultra-deepwater fields, signaling a shift in how subsea inspection work gets done.
3 months ago IndustryWoodside Begins 24-Well Trion Campaign in Gulf of Mexico
Woodside and PEMEX launch $1B+ ultra-deepwater drilling program creating opportunities for Gulf Coast service companies and supply vessel operators.
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