downhole steam generator
TRANSCRIPT
DOWNHOLE STEAM GENERATOR ( DHSG )
( A DOWNHOLE INNOVATION )
Presented by:Rishabh SaurabhPE15M013
-:CONTENT:- Introduction to DHSG. Limitation of conventional Heavy-oil EOR Overcoming conventional Heavy-oil EOR DHSG Technology Economic Advantage Conclusion. Reference
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WHAT IS DHSG?o A Down hole innovation in the field of heavy oil EOR.
Down Hole
Steam Generato
r
Conventional
Surface Steam
injection
Conventional
Co2 injection Conventiona
lIn-situ
combustion
CONVENTIONAL HEAVY-OIL EOR:-SurfaceSteam
Injection• Generation of
steam at surface
• Injected down to heavy oil reservoir.
• Steam vapor transfers heat to the oil.
Co2
injection• Collection of
co2 from nearby sources.
• Injected down to heavy oil reservoir.
• Dissolution of co2 in the oil.
In-situ Combustion
• Burning some of the hydrocarbon in-situ creates a combustion zone.
• generation of inert gas.
• Creation of steam drive and gas drive
CONVENTIONAL HEAVY OIL-EOR LIMITATIONS :-
SurfaceSteam
Injection• Not suitable
for deeper reservoir
• Degradation of thermal efficiency
Co2 injection
• Availability and project cost
• Limited miscibility at low reservoir pressure
• Low recovery
In-situ Combustion
• Sensitive to spacing
• Difficult to monitor and control
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Queries??
Fig: decrease in steam quality with depth
EVIDENCE :-
Fig: showing decrease in no of steam project over years due to limitation of depth
OVERCOMING CONVENTIONAL-EOR LIMITATIONS BY USING DHSG WHICH PROVIDES:-
Injection of high quality steam in reservoir Delivery of steam together with inert or reactive gases. Higher pressure reservoir conditions.
DHSG TECHNOLOGY;-
FIG: DHSG and umbilical caring water, fuel and mixture of gases.
DHSG TECHNOLOGY;-
FIG: Cross-section of DHSG
DHSG TECHNOLOGY;-
FIG: Cross-section of burner
MECHANISM OF DHSG EOR:-
Effect of gas on heavy oil viscosity
Effect of gas with steam on heavy oil production
Steam + injected gas for reservoir production optimization
Can be understood in 3 steps
Steam + Nitrogen/co2 and Enrich Air for
moderate heavy oil
•Main use of co2 is to decrease viscosity• Steam to heat the oil and condensed water to drive the oil
Steam + co2 + o2 for In-situ Oxidation
• CO2 is used as a cooling gas.
• O2 to in-situ oxidation of extra heavy viscous oil
• O2 + high quality steam enables a larger, more stable Steam front
DHSG OPERATING MODESMODE 1 MODE 2
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FIG for mode 1: Use of DHSG to recover oil in a steam drive.
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FIG:Use of DHSG with excess oxygen for generation of CO2 and steam
ECONOMIC ADVANTAGE
ECONOMIC ADVANTAGE
CONCLUSIONS:-1. Combines best of the EOR technologies
concurrently.2. Depth is not an obstacle for thermal
application.3. Provide optimal configurations for a variety
of heavy oil reservoirs.4. Uses of less water than surface steam.5. Lower CO2 and NOx emission to environment.6. Field development with DHSG is more
energy efficient than of conventional steam flood.
7. Green field project.
CONT..DHSG may provide a way to extract a large
amount of heavy oil deposits economically.
REFERENCES:-oArticle on DHSG, JPT JUNE 2012, oWare, Charles W. Jr.: "An Evaluation of Alternatives in Downhole Steam Generation,“ DOE/PO/10879-1, Sept. 1981.oSmith, R. V. (to Phillips Petroleum Co.): "Downhole-Burner Apparatus," U. S. Patent 3,456,721 (July 22, 1969). oCapper L., Stars oil and gas, Advancing Thermal and carbon Dioxide recovery method, SPE 150515oKujawa, Patrick: "Heavy Oil Reservoirs Recoverable By Thermal Technology. Volume I," DOE/ET/12380-1 (VoL I), Feb. 1981.
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