High-pressure air injection

Август 11, 2022

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High-pressure air injection

Содержание

2. HPAI IN-SITU COMBUSTION
3. GLOSSARY
4. INTRODUCTION High-pressure air injection (HPAI) is an enhanced oil recovery process in which compressed air is
5. HISTORY 1979, Buffalo, USA, recovery – 64% 2002, North Ceder Hills, USA, recovery – 60% 2003,
6. HPAI Process Overview
7. HPAI Process Overview During the interaction between oxygen and oil, two possible reaction pathways exist: the
8. HPAI Process Overview During bond scission reactions, the oxygen reacts with the hydrocarbon molecules to produce
9. HPAI applicability Oil recovery by tradition methods - 3-5 %
10. HPAI applicability Dynamics of the gas concentration during HPAI process.
11. HPAI advantages • Reservoir pressurization • Production response within a short time period • Consumption of
12. HPAI disadvantages • Air compression and operation could be expensive • Complex process: multiphase flow, heat
13. Why reconsider HPAI today? • Thermally, it is the most efficient oil recovery process • Availability
17. ISC advantages 1. Transition to the gas phase of some (lightest) components of oil saturating the
18. ISC disadvantages to take measures to protect the environment and disposal of combustion products to prevent
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HPAI
IN-SITU COMBUSTION

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GLOSSARY

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INTRODUCTION
High-pressure air injection (HPAI) is an enhanced oil recovery process in

which compressed air is injected into reservoir.

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HISTORY

1979, Buffalo, USA, recovery – 64%
2002, North Ceder Hills,

USA, recovery – 60%
2003, Little Beaver, USA, recovery – 58%
2001, West Medicine Pole, USA, recovery – 40%
1985, Medicine Pole Hills, USA, recovery – 38%

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HPAI Process Overview

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HPAI Process Overview
During the interaction between oxygen and oil, two possible

reaction pathways exist: the first is referred to as “bond scission” reaction and the second is called the “oxygen addition” reaction.

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HPAI Process Overview
During bond scission reactions, the oxygen reacts with the

hydrocarbon molecules to produce carbon dioxide, water and energy.

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HPAI applicability
Oil recovery by tradition methods - 3-5 %

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HPAI applicability
Dynamics of the gas concentration during HPAI process.

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HPAI advantages
• Reservoir pressurization
• Production response within a short time period
•

Consumption of 7 to 10% of oil in place can lead potentially to
recovery of all remaining oil
• Potential to enhance oil recovery after depletion or waterflooding

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HPAI disadvantages
• Air compression and operation could be expensive
• Complex process:

multiphase flow, heat transfer and chemical
reactions. It is difficult to model.
• It requires special (non-conventional) laboratory tests
• No offshore experience
• Operationally challenging (i.e. emulsion treatment, risk of
explosions, etc.)

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Why reconsider HPAI today?
• Thermally, it is the most efficient oil

recovery process
• Availability of air (cheap injection fluid)
• Proven technology in different reservoir settings (shallow heavy oil and deep light oil reservoirs)
• High displacement efficiency
• It can be applied in cases where waterflooding or steam injection are not effective

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ISC advantages
1. Transition to the gas phase of some (lightest) components

of oil saturating the rock before the combustion front.
2. Splitting (cracking) of some hydrocarbons that make up oil.
3. Combustion of coke-like residue formed as a result of cracking process.
4. Melting of paraffins and asphaltenes in the pores of the rock.
5. Transition to the vapor phase of formation water, located in front of the front.
6. Reduction of oil viscosity in front of the front as a result of its heating and mixing with light oil fractions carried by the gas flow from the combustion front.
7. The condensation of the products of the distillation of crude oil and the formation of the movable zones of high oil saturation ahead of the combustion front at the lower temperatures.

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