downhole steam generator

21
DOWNHOLE STEAM GENERATOR ( DHSG ) ( A DOWNHOLE INNOVATION ) Presented by: Rishabh Saurabh PE15M013

Upload: gowtham-dada

Post on 15-Apr-2017

367 views

Category:

Engineering


1 download

TRANSCRIPT

Page 1: Downhole steam generator

DOWNHOLE STEAM GENERATOR ( DHSG )

( A DOWNHOLE INNOVATION )

Presented by:Rishabh SaurabhPE15M013

Page 2: Downhole steam generator

-:CONTENT:- Introduction to DHSG. Limitation of conventional Heavy-oil EOR Overcoming conventional Heavy-oil EOR DHSG Technology Economic Advantage Conclusion. Reference

……………………..

Page 3: Downhole steam generator

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

Page 4: Downhole steam generator

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

Page 5: Downhole steam generator

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

Page 6: Downhole steam generator

THANK YOU

Queries??

Fig: decrease in steam quality with depth

Page 7: Downhole steam generator

EVIDENCE :-

Fig: showing decrease in no of steam project over years due to limitation of depth

Page 8: Downhole steam generator

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.

Page 9: Downhole steam generator

DHSG TECHNOLOGY;-

FIG: DHSG and umbilical caring water, fuel and mixture of gases.

Page 10: Downhole steam generator

DHSG TECHNOLOGY;-

FIG: Cross-section of DHSG

Page 11: Downhole steam generator

DHSG TECHNOLOGY;-

FIG: Cross-section of burner

Page 12: Downhole steam generator

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

Page 13: Downhole steam generator

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

Page 14: Downhole steam generator

THANK YOU

FIG for mode 1: Use of DHSG to recover oil in a steam drive.

Page 15: Downhole steam generator

THANK YOU

FIG:Use of DHSG with excess oxygen for generation of CO2 and steam

Page 16: Downhole steam generator

ECONOMIC ADVANTAGE

Page 17: Downhole steam generator

ECONOMIC ADVANTAGE

Page 18: Downhole steam generator

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.

Page 19: Downhole steam generator

CONT..DHSG may provide a way to extract a large

amount of heavy oil deposits economically.

Page 20: Downhole steam generator

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.

Page 21: Downhole steam generator

THANK YOU

Queries??