Enhanced Oil Recovery
Both nitrogen and fire floods are used in order to enhance oil recovery. The basic difference is a fire flood injects air while a nitrogen flood injects near pure nitrogen.
A typical gas content in a flood has;
• A variable inlet nitrogen content;
• An increase of nitrogen content over time as field matures.
Our answer:
The Nitech™ NRU process is able to take on these variables and escalations, without need for equipment modifications.
Also normal in for these facilities is;
• An integrated NGL extraction is a requirement;
• The process gas will be associated with oil/condensate production, therefore will contain high levels of C3+ hydrocarbons
Our answer:
Nitech™ process can integrate NGL extraction with high ethane recovery
Our history with flood applications;
• 3 NRUs associated with nitrogen floods;
• 1 NRU associated with a fire flood.
The Gas Processing Group Folder
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The Gas Processing Group Folder
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Project Reference
Plant Location: Bowman, ND, USA
Facility Size: 430 million m³ per year
Gas Source: Associated gas from fire flood
Plant Type: Carbon Dioxide, Nitrogen, Water, and NGL Extraction/Fractionation
Inlet Gas: N2 60% to 75%
Project Type: EPC
Completion: August 2007
PROJECT DESCRIPTION
In Southwestern North Dakota, producers are injecting air into oil producing reservoirs in order to increase the temperature in the reservoir and to decrease the viscosity of the crude oil. In addition, the reservoir pressure is increased facilitating increased production. We employed a proven process designed to remove residual amounts of oxygen coming from the reservoir that had not taken part in the combustion process. In addition, there was a significant amount of carbon dioxide and nitrogen generated by the air flood process. Our process is designed for a wide range of nitrogen since the air injection process is on-going and the nitrogen content is increasing. This facility utilizes the newest generation Nitech™ internal condenser that provides a cleaner nitrogen vent relative to methane losses. Another feature of this facility was to design with small footprints since the facility is installed in process buildings as required to protect the facility from the harsh and cold winter environment with normal temperatures reaching from -29 to -40 degrees C. Carbon dioxide removal is brought about by the use of conventional amine and reduces the carbon dioxide content feeding the NRU from approximately 8 PPM to approximately 10 PPM. The oxygen removal system was designed to remove oxygen content to as low as 1 PPM. Nitrogen is removed from near 60% down to the specified level of approximately 10% to be used for both sales and field fuel gas. The Nitech™ NRU also includes integrated NGL extraction. The facility also fractionations the liquids to produce an HD-5 grade propane for the local market.
