Unlocking Stranded Deepwater Reserves With Modular, Low-Emission Offshore Production
Upcycling idle drilling units into powerful, flexible, and emissions-reducing Mobile Offshore Production Units.
About Modular MOPU
Modular MOPU is an energy technology company delivering modular offshore production solutions that unlock high-return deepwater opportunities by repurposing existing offshore assets into Mobile Offshore Production Units. Built on dynamically positioned Mobile Offshore Drilling Units (MODUs), each Modular MOPU enables rapid deployment and flexible field development without relying on export pipelines or new fixed infrastructure.
Modular MOPU integrates proven three-phase processing with optional advanced gas-conversion capability through its proprietary 4th Phase Processing System. This allows operators to capture and use associated gas as fuel, reinject it, or convert it into value-added products such as hydrogen, carbon black, or synthetic fuels, reducing routine flaring and supporting lower-emission production.
Mission
Modular MOPU’s mission is to accelerate low-emission offshore production by eliminating infrastructure bottlenecks, reducing time to first oil, and converting associated gas into useful energy and products through modular, redeployable systems.
Modular MOPU supports Energy Transition. Our modular solutions reduce or eliminate routine flaring and can convert natural gas—via optional processing modules—into hydrogen, carbon black, or synthetic fuels. This approach supports lower-emission production while recycling MODUs to reduce environmental footprint.
Oil + Hydrogen + Carbon Black
Oil + Low-Emission Synthetic Fuel (GTL)
Oil + Power for Data Centers
Opportunities & Benefits
Revolutionizing deepwater development with innovative modular solutions
No Export Pipelines
Convert natural gas
Inject natural gas
Reduced CAPEX & OPEX
No 3rd party boarding fees
No PHA fees
No export pipeline fees
Re-purpose dynamically positioned MODUs
Oil storage on tankers
Less subsea abandonment obligations
Utilize field gas for fuel
Minimize delineation drilling
Flexibility
Early / interim production system
Full field development
Modular production systems
Plug & play solution
Redeploy at end of field life
Reduce Development & Operational Risk
Optimize well placement
Optimize permanent development solution
Maintain management and control over production operations
Reduce flow assurance issues
Increase ultimate oil recovery
Evade severe weather
No post hurricane 3rd party start-up delays
100MM BBLs Stranded in West Africa – Traditionally uneconomic but profitable with Modular MOPU’s technologies
Accelerate First Oil, Improve ROR
Rate of Return @ 100MM Barrels
Base Case
56%
Low CAPEX/OPEX (-20%)
66%
High CAPEX/OPEX (+30%)
38%
EBITDA NPV₁₀ @ 100MM Barrels
Base Case
$1,180 Million
Low CAPEX/OPEX (-20%)
$1,470 Million
High CAPEX/OPEX (+30%)
$731 Million
Capital Recovery in 5 Years
Surface & Subsea
$688 Million
Total CAPEX
$1,145 Million
Technology Overview
Modular MOPU integrates proven three-phase processing systems with optional advanced gas-conversion modules, including pyrolysis and GTL technology. Each unit is built on a dynamically positioned Mobile Offshore Drilling Unit (MODU), which allows rapid deployment, flexible field development, and redeployment at end of field life. The system can be designed to handle from 5 to 50 MMscf per day of natural gas and supports oil production rates up to at least 60,000 BOPD.
Patent-pending 4th Phase system
Modular MOPU’s integrated production and gas-conversion architecture is the subject of pending patent applications. This includes the 4th Phase Processing System, which adds onboard gas-conversion modules (such as pyrolysis and GTL units) on top of standard three-phase oil, gas, and water processing. It also includes our Subsea Gathering System, which routes multiple subsea wells efficiently into a mobile, dynamically positioned host.
Modular offshore production that accelerates first oil and lowers emissions
Modular MOPU deploys modular processing on repurposed Mobile Offshore Drilling Units (MODUs) to bring production online faster, reduce capital intensity, and improve operator control. Optional gas-conversion modules can reduce or eliminate routine flaring and convert natural gas into hydrogen, carbon black, or synthetic fuels, supporting lower-emission offshore development.
Deepwater Development Advantage
Lower-Emission Production
Available Services
Comprehensive support for your deepwater development needs
Technical Support
- Drilling | Completion
- Subsea Engineering & Installation
- Production Systems
- Water Treatment
Modular MOPU Partners
- Apex Subsea, Inc.
- Production Technology & Services, Inc.
Development Solutions
- Extended Well Testing
- Early Production
- Full Field Development
-
Integrated Production & Utility Riser System
- Emergency Disconnect
- Lower Production Package
- Structural Flowbase Manifold
Services Available
- Technical Support
- FEED Studies
- System Engineering & Integration
- Subsea Engineering
- MODU Conversion & Integration
- Procurement & Finance Support
Leadership Team

Craig T. Castille
Founder & Managing Member
Craig brings more than 40 years of offshore operations, risking, and economic planning experience.
Robert A. Hoff
Member, Surface Production Systems
Leads surface production integration through Production Systems Technologies (PTS).
Venk Bhat
Member, Subsea Production Systems
Leads subsea engineering and project management through APEX Subsea.Get in Touch
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