Nitrogen (N₂) EOR/IOR Consulting

Nitrogen Injection for Miscible/Immiscible EOR and Pressure Maintenance of Gas-Condensate and Volatile-Oil Reservoirs — Worldwide

When CO₂ isn't available, or when preserving marketable hydrocarbon gas matters to your project's economics, nitrogen is often the injectant that makes an EOR or pressure-maintenance project work. A&A's consultants can help you find out if it's right for yours.

Avasthi & Associates, Inc. (A&A) is an independent petroleum engineering consulting firm. A&A does not sell nitrogen, CO₂, hydrocarbon gas, or injection equipment — our only business is expert technical consulting, which means our recommendation of N₂, CO₂, or hydrocarbon gas as the injectant for your project is based solely on your reservoir's fluid properties, injectant availability, and economics — never on a stake in any particular vendor or technology.

In addition to CO₂ injection projects, the high-level, seasoned consultants of the A&A Consulting Team have extensive experience working on nitrogen (N₂) injection projects.

Nitrogen as an EOR Alternative to CO₂

Many times, when A&A determines that CO₂ injection would be an ideal EOR scheme for a client's oil reservoir, the client does not have the necessary CO₂ supply available for injection. In these cases, clients normally ask A&A to evaluate the potential of injecting N₂ vis-à-vis CO₂. A&A's EOR consultants are experts in conducting N₂ injection studies, just as they are experts in conducting CO₂ injection studies, using state-of-the-art PVT/compositional reservoir simulation.

Pressure Maintenance for Gas-Condensate and Volatile-Oil Reservoirs

Whenever A&A's clients discover a retrograde gas-condensate or a volatile-oil reservoir, the first thing they typically want investigated is the desirability of operating the reservoir under a pressure-maintenance scheme, to keep reservoir pressure above the saturation pressure of the reservoir fluid. In the case of rich retrograde gas-condensate reservoirs and high-shrinkage volatile-oil reservoirs, maintaining reservoir pressure above the saturation pressure is essential to maximizing liquid-hydrocarbon recovery — and this is most commonly accomplished by N₂ or hydrocarbon-gas injection, whichever is available and more economical.

Related A&A Service: For a full discussion of hydrocarbon gas as the pressure-maintenance and miscible-EOR injectant, please see A&A's Hydrocarbon Gas EOR Consulting page.

Why Nitrogen, Specifically?

Nitrogen offers several practical advantages over hydrocarbon gas as a pressure-maintenance or EOR injectant, which is why A&A's clients frequently ask us to evaluate it first:

• It does not consume marketable hydrocarbon gas — reinjecting hydrocarbon gas for pressure maintenance defers the revenue from selling that gas, while N₂ leaves it available for sale

• It is generally available on-site, at scale, via cryogenic or membrane air-separation units — reducing dependence on an external gas supply

• It is inert and non-corrosive, which can simplify materials selection for injection wells and facilities compared with CO₂

• It is often less costly than CO₂ or hydrocarbon gas on a per-unit-injected basis, depending on location and scale

A&A's Nitrogen EOR/IOR Consulting Services

A&A Consulting Team's nitrogen injection expertise includes, but is not limited to:

• Injectant-selection studies — comparing CO₂, N₂, and hydrocarbon gas on miscibility, availability, and cost — for a given reservoir and location

• PVT/compositional reservoir-simulation studies to determine minimum miscibility pressure (MMP) and expected recovery for N₂ injection

• Pressure-maintenance feasibility studies for retrograde gas-condensate and volatile-oil reservoirs

• Pilot-test design, evaluation, and optimization of N₂ injection projects

• Field-wide N₂ injection project design, evaluation, and optimization

• Ongoing project surveillance to track injection and recovery performance

What A&A Delivers

A nitrogen EOR/IOR consulting engagement with the A&A Consulting Team is built around the practical decisions your company needs to make, including, but not limited to:

• A clear, economics-based recommendation on whether N₂, CO₂, or hydrocarbon gas is the injectant best suited to your reservoir and supply situation

• Compositional simulation results supporting the recommended injection scheme and expected recovery uplift

• A pilot-test design and monitoring plan to de-risk full-field implementation

• Economic evaluation and sensitivity analysis to support the investment decision

• Presentation-ready recommendations for your company's management, partners, and investors

We can put teams of our high-level, seasoned N₂ EOR/IOR consultants — with extensive experience in reservoir simulation, facilities, and related studies — to work on your company's N₂ EOR/IOR projects, around the world, whenever required.