29-12-2010, 10:48 AM
Guide:
BINU B PILLAI
BY:BINU B PILLAI
SHERIN THAMPI
ENHANCED OIL.pptx (Size: 1.17 MB / Downloads: 100)
INTRODUCTION
Enhanced oil recovery(E.O.R) is technique for increasing the amount of crude oil extracted from the oil field.
Efficiency of E.O.R is more than 30-60%
where other techniques have 20-40% efficiency.
E.O.R is achieved by gas injection, chemical injection, microbial injection and thermal recovery
THERMAL METHODS…
Used for recovering heavy oils.
Principle: Increasing the oil temperature will reduce the viscosity.
Two Methods:
Steam is injected into the well
Production of heat directly within the reservoir by burning some of the oil in place
MISCIBLE METHOD…
Fastest growing E.O.R process.
A solvent is mixed with residual oil to overcome capillary force and increase mobility.
Solvents include L.P.G,N2,CO2,Alcohol.
Air cannot be used to re-pressurize the reservoir because oil will easily catch fire.
Factors affecting recovery rate are pressure, depth, temperature, oil gravity and viscosity of solvent should be less than oil.