A complete system, dedicated to generating and injecting high quality steam into the oil well. It has an advanced technology that encourages the production of more oil and reduces costs and operation time through a more sustainable and profitable process

How does it work?

Nakasawa Resources’ technology increases heat transfer to the reservoir with greater thermal efficiency, improving surface and reservoir-level steam quality, which increases crude oil mobility and therefore reservoir productivity.

These systems can operate with high total dissolved solids (TDS) without condensed water and thermal energy loss in the saturated condensate. The 95% quality steam makes steam injection effective and very cost-effective in enhanced oil recovery (EOR) processes.

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The systems consist of a high-efficiency cyclone steam separator, a set of tubes, superheater or superheater coil, mixers with automatic control valve, and a steam quality sampling system for continuous monitoring.

These processes involve controlled separation and remixing of the condensate with a sprinkler mixer operated by an automatic control valve to obtain steam qualities starting at 95%. Therefore, the process avoids loss of condensate, and the total mass goes to the system outlet and injection point.

Stages of the process:

A-B-C-D-1-2-3

Generation of humid steam (75% - 80%) radiant section (outlet). Similar process to a conventional generator.

E

The wet steam is then separated into 99% dry and saturated condensate inside the high efficiency cyclone separator. Generation of wet steam (75% - 80%) radiant section (outlet). Similar process to a conventional generator.

F-5

The dry steam is superheated in a tube bundle or superheater.

G-5-6

As it is a continuous generation process, the superheated steam is re-mixed with the separated condensate to achieve the desired steam dryness of 95% at the system outlet.

G-H

In this phase, there is a controlled remixing of the condensate and dry steam, so there is no loss of condensate or effluent is generated and the total mass of water leaves the system as steam with 95% dryness.

Support service and support in every step

Count on the services of Nakasawa Resources anywhere and anytime, from the strategic design of the project to its implementation, maintenance and monitoring.

Nakasawa provides full project implementation service, including the human resources and consumables necessary to ensure successful enhanced oil recovery in new and mature heavy oil fields. In turn, clients can count on training for their personnel on the optimal use of technology.

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Nakasawa’s complete service for implementing its steam injection technologies includes

  • Analysis of the reservoirs.
  • Services and operation of the steam generators and all the equipment, and auxiliary services.
  • Completion system and equipment for injection wells.
  • Completion system and equipment for producing wells.
  • Monitoring of the reservoir variables, optimization and production, through the Supervisory Control and Data Acquisition (SCADA), radio and/or optical fiber systems that allow the execution of actions in real-time and the automatic measurement of operational parameters and surface and bottom conditions.

Support service and support in every step

The steam injection service will comply at all times with applicable national and international regulations, and will be carried out taking into account the recommendations of the equipment manufacturers regarding installation, wiring, calibration, testing, special requirements, and others, for the proper functioning and operation of the equipment. Among the regulations that govern the service, are:

  • The International Society of Automation (ISA)
  • International Electrotechnical Commission (IEC)
  • American National Standards Institute (ANSI)
  • American Petroleum Institute (API)
  • American Society of Mechanical Engineers (ASME)
  • National Electrical Manufacturers Association (NEMA)
  • National Fire Prevention Association (NFPA)
  • American Society for Testing and Materials (ASTM)

Automation

As a fundamental aspect, NAKASAWA has incorporated as an integral part of the process the monitoring of the operation parameters during the injection and post-injection stages to carry out an exhaustive control of the operations and guarantee the optimum performance of the equipment.

The automation process has several advantages where an automatic recording is made through the collection of data in real-time. The sensors record data on parameters such as pressure and temperature, fiber optics (DTS), and thermocouples to verify the progressive state of the measurement system, recording the system efficiency indicators, as well as the amplitude and phase digits.  In addition to documenting sensor performance over time, potential problems can also be detected in advance.

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Results may vary depending on existing equipment conditions. Please consult a Nakasawa representative to obtain all details.