This power point presentation summarizes in-situ combustion, specifically the air requirements. It introduces in-situ combustion as a thermal recovery method that generates a fire underground using injected oxygen. It then describes the key techniques as including gas drive, water drive, forward and reverse processes. The methods are defined as dry combustion using only air and wet combustion combining water and air injection. Characteristics of suitable reservoirs are identified as having permeability over 100md, porosity, thickness over 10ft and depth sufficient to confine injected air. The conclusion restates that in-situ combustion aims to recover hydrocarbons via combustion with no depth limit impacting injection pressure.

1. A
POWER POINT PRESENTATION
ON
IN-SITU COMBUSTION, AIR REQUIREMENT FOR IN SITU COMBUSTION
PRESENTED BY-ankit panar
PRESENTED TO- Asst.Prof. rajesh sharma
Ajmer institute of technology, ajmer (RAJ.)

2.  TABLE OF CONTENT
 INTRODUCTION
 TECHNIQUES AND
PROCEDURE INVOLVED
METHODS
 ISC PATTERN
CHARACTERISTIC
CONCLUSION

4. INTRODUCTION
 IT IS A METHOD OF THERMAL RECOVERY
 A Fire is generated inside the reservoir by injecting a gas
containing oxygen, such as air.
Special heater in the well ignites the oil in the reservoir and starts
fire.
 Oxygenated air is injected into the injection well.

6. The ISC treatment is an exothermic process
that assists the improvement of oil recovery by
reducing the viscosity of the oil by the
generated heat from the burned oil.
 ISC treatment generates less greenhouse
gas emission since the compressed air is
injected to the reservoir instead of steam.

7. TECHNIQUES AND PROCEDURE INVOLVED
Most of the oil is driven toward the producer by a combustion of a following:-
1. Gas drive
2. Water drive
Based on the respective direction of front propogation and air flow the process
can be either of the following-
1.Forward
2.Reverse

8. Gas drive- A recovery mechanism for oil well
containing dissolved gas and free gas, whereby
energy of Expanding gas is to drive oil from the
reservoir formation into the wellbore.
water reservoir-drive mechanism -whereby the oil is driven through the
reservoir by an active aquifer. As the reservoir depletes,
the water moving in from the aquifer below displaces the oil until the
aquifer energy is expended or the well eventually produces too
much water to be viable.

10. METHODS
1.DRY
COMBUSTION
2.WET
COMBUSTION

11. 1. DRY COMBUSTION –
An in situ combustion technique in which only air or oxygen-enriched air mixtures are
injected into a formation.
 After the ignition, combustion front gets propagated by the continuous flow of the air.
 combustion front acts as a piston which pushes ahead of it the unburnt crude fractions
from the swept zones.
 heavy fraction converted into coke, are burnt with the oxygen in the air injected to
sustain combustion

12. 2. Wet combustion
 Wet combustion actually refers to wet forward combustion and was developed to
use the great amount of heat that would otherwise be lost in the formation.
 The injected water recovers the heat from behind the burning front and transfers it to the oil bank ahead.
 Combining water and air injection after start up of the combustion process.
 In which high thermal recovery capacity of water may be used to recover the enthalpy
of remaining behind the dry Combustion.

13. ISC PATTERN CHARACTERISTICS
Reservoir thickness should be greater than 10 ft to avoid
excessive heat losses to surrounding formation. However,
very thick formations may present sweep efficiency
problems because of gravity override.

Permeability has to be large enough (greater than
100 md) to allow more flow of the viscous oil and
achieving the desired air injectivity.

14. •
 Porosity and oil saturation have to be large enough to allow the
economic success of the process
.

The reservoir depth should be large enough to confine the
injected air in the reservoir. In general, there is no depth
limit except that may affect the injection pressure.

15. CONCLUSION
 ISC AIMS TO RECOVER HYDROCARBONS BY COMBUSTION PROCESS
 RESERVIOR DEPTH SHOULD BE LARGE ENOUGH TO CONFINE THE INJECTED
INTO THE RESERVIOR
NO DEPTH LIMIT WHICH LEADS THE INJECTION PRESSURE .

16. THANK-YOU