Portable Once-Through Steam Generators (OTSG) for Enhanced Oil Recovery

25 MMBTU/HR Trailer-Mounted Units Available for Purchase

Serving California, domestic, and international EOR operations.

Esys provides high-efficiency, trailer-mounted Once-Through Steam Generators (OTSGs) designed for thermal Enhanced Oil Recovery (EOR). Rated at 25 MMBTU/hr and engineered for rapid deployment, our natural gas-fired units provide high-pressure steam injection directly to the well site without requiring permanent infrastructure. Fully assembled and tested at our Bakersfield, California facility, units are available for immediate mobilization across the San Joaquin Valley, Kern River Field, and global energy markets.

Call (661) 833-1902
  • License: CA Contractor Lic. No. 662541
  • Facility: Assembled & Tested in Bakersfield, CA
  • Safety: NFPA-Compliant Combustion Controls

Designed for EOR Operators & Energy Leaders

Engineered specifically for petroleum engineers, procurement managers, EOR field operators, and energy production companies requiring reliable, high-volume steam generation. Whether you need reliable steam injection during well testing, supplemental capacity for heavy oil fields, or permanent unit replacement in the San Joaquin Valley or international basins, Esys delivers field-ready units with minimal site preparation.

Technical Specifications

Perfectly suited for oil field steam generation (enhanced oil recovery via thermal injection), our 25 MMBTU/HR input, trailer-mounted portable natural gas (or propane) fueled once-through steam generators (OTSG) are rated for a maximum pressure of 2,000 PSIG MAWP at 1,500 bbl/day and include:

  1. Generator Mechanical Description:
    • Approximately 880 ft2 25M Radiant section lined with ceramic fiber insulation
    • Approximately 6,000 ft2 high efficiency convection box, lined with castable refractory. Includes transition section to radiant target wall and stack
    • External feedwater piping with single block valve and check valve
    • Steam discharge piping with a single block and check valve
    • Steam generator mounted on a DOT rated trailer (May only require purple permit)
    • Two-pass feedwater heat-exchanger with two valves
    • Pigging elbows with blind flanges at the convection box and radiant section
  2. Allen-Bradley ControlLogix PLC-Based Fully Automatic Control System. Automatic control of:
    • Steam quality
    • Water flow
    • Combustion air flow
    • Fuel flow
    • FGR
    • Stack oxygen
  3. Instrumentation and End Devices
  4. Low NOx North American Burner with Automatic Flue Gas Recirculation System
  5. Blower and Motor Assembly (VFD equipped)
  6. Natural Gas/Propane Fuel Train
  7. Automatic Feedwater Hardness and Dissolved O2 Monitor
  8. High Voltage Panel with 480 Volt Switchgear
  9. Feedwater Pump System and Pulsation Dampener
  10. Feedwater Pump VFD
  11. Stack and FGR O2 Control
  12. Code-Required Relief, Check, and Block Valves
  13. NFPA-Compliant Combustion Control System and Gas Train
  14. Operator Access Platforms
  15. Estimated Fuel Usage 600 MCFD
  16. Power Usage Approximately 400 Amp, 480 VAC
  17. Feedwater Pre-Heater

Unit Demonstration Video

Frequently Asked Questions

What is a Once-Through Steam Generator (OTSG) and how is it used in EOR?

A Once-Through Steam Generator (OTSG) is a specialized boiler system that forces water through continuous, uninterrupted tubing runs to generate high-pressure, high-quality steam in a single pass. In thermal Enhanced Oil Recovery (EOR), this steam is injected into underground reservoirs to heat heavy crude oil, reduce its viscosity, and facilitate production.

What are the primary operating specifications of the Esys 25 MMBTU/hr OTSG?

Our portable OTSG features a 25 MMBTU/hr heat input rating, a maximum allowable working pressure (MAWP) of 2,000 PSIG, and an output capacity of up to 1,500 barrels per day (bbl/day). It features an Allen-Bradley ControlLogix PLC-based automatic control system, low NOx burner, and is fully trailer-mounted for rapid transport.

How can I purchase an Esys 25 MMBTU/hr OTSG?

Esys provides 25 MMBTU/hr trailer-mounted OTSG units for direct purchase. You can request a custom quote or contact our sales and engineering team directly to discuss specifications, custom configurations, lead times, and mobilization details for your site.

What geographical regions do you serve?

We regularly supply equipment and engineering support throughout California (including the Kern River Field, and San Joaquin Valley) and across the United States. Additionally, Esys supplies and supports international operations across major heavy oil basins including Venezuela, Brazil, and Kuwait.

What fuel source and power are required to run the generator?

The burner system is engineered to run on natural gas or propane with an estimated fuel consumption of 600 MCFD. Alternative fuel sources such as diesel can be quoted and used with this steam generator. Operating power requires approximately 400 Amp, 480 VAC.

Equipment Photos & Deployment

Portable steam generator ready for transport

Ready for delivery. Assembled and tested at our Woodmere facility in Bakersfield, California, USA.


Portable Steam Generator fully-assembled at Esys Side view of trailer-mounted steam generator and control systems Close-up view of instrumentation

Contact Us For Specifications & Purchase Details

Esys The Energy Control Company
4520 Stine Rd Suite 7, Bakersfield, CA 93313

Call (661) 833-1902

California Contractor Lic. No. 662541