The Characteristics of High Temperature In‐situ Combustion Mode In Intensive Heterogeneous Reservoir ‐ A Case Study in Block HQ of Xinjiang Oilfield Organized by: Xi, Changfeng PIRED, CNPC WHOC16-[140]
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The Characteristics of High Temperature In‐situ Combustion Mode In Intensive Heterogeneous Reservoir ‐ A Case Study
in Block HQ of Xinjiang Oilfield
Organized by:
Xi, ChangfengPIRED, CNPC
WHOC16-[140]
Contents
1 Background
2 The Characteristics Of High Temperature In-situ
Combustion Mode
3 The Facilitating Key Factors Of High Temperature
In-situ Combustion Mode
4 Conclusion
1 Background
Burnt zone
Burning zone
Coke zone
Steam zone
Oil bank
Residual oil zone
The reservoir is ignited by igniter in the injector, the air is continuously injectedto reservoir and combustion front moves towards the producer. The oil is driven into the producer by a combination of gas drive, steamflooding, hot water flooding and high temperature distilling, cracking mechanisms.
Injection wellProduction well
• Process of ISC
1 Background
Projects Started Time Introduction
D-66, Liaohe
Oilfield
Jun.2005 Steam injected heavy oil reservoir ;200 nine-spot patterns and 600
producers ; oil rate 5000 bbl/d .
G-3618, Liaohe
Oilfield,
May.2008 Steam injected heavy oil reservoir with depth of 1500m;14 injectors,
92producers; oil rate 1306 bbl/d.
H-1 Pilot, Xinjiang
Oilfield
Dec.2009 Heavy oil reservoir after steam stimulation and steamflood; 7 injectors and
49 producers , oil rate 251 bbl/d.
Fengcheng Pilot,Xinjiang Oilfield Sept.2014 Initial heavy oil reservior, 4 injectors and 4 horizontal wells, 300bbl/d
Total Oil rate 6557bbl/d
Currently active ISC projects in China
• Application in China
1 Background
Depth 1805ft
Thickness of pay zone 26.9ft
Initial pressure and
temperature929psi; 68F
Average porosity 25.4 %
Average horizontal
permeability 582 mD
Dead oil viscosity at 122F 500～1200 cp
Initial oil saturation 67 %
Reservoir Characteristics
•H-1 ISC Pilot Test
1 Background
MODE Well numberSteam injection
（MMbbl）
Oil production
（MMbbl）Water cut SOR ER
CSS 141 6.76 2.40 80.5% 2.85 26.5%
SD 53 1.45 0.22 89% 6.67 2.4%
Development history
•H-1 ISC Pilot Test
1 Background
Development history
•H-1 ISC Pilot Test1 Background
Steam injection vertical profile Production vertical profile
Water cut: 99%-65%AOR: 57,000-11,400 scf/bblNO combustion front breakthroughCumulative oil of ISC is already near to that of steam injectionRF: 26%
•H-1 ISC Pilot Test
1 Background
There are same characteristics for single well.
•H-1 ISC Pilot Test
1 Background
2 The Characteristics Of High Temperature In-situ
Combustion Mode
hH008
hH011
hH012
hH013
hH009
hH010
hH007
12
High Temperature of Combustion front
0
100
200
300
400
500
600
700
2010/8/10 2010/9/29 2010/11/18 2011/1/7 2011/2/26 2011/4/17 2011/6/6 2011/7/26
T，℃
date
538m
541m
543m
The temperature of combustion front is more than 930F.
CO2 content distribution（201403 ）
CO2 content: 15%H/C Ratio: 1.4
High CO2 content and low H/C Ratio
Limited(CnH2n+2) H/C is =2.0;The cracked heavy oil components were burned.
14
Produced oil before ISC
Produced oil of ISC
Upgrade in oil composition
well Sample Saturate /% Aromatic /% Resin &
Asphaltene/% Vis，cp
h2107A 2009/3/10 45.43 24.51 30.06 11000
2010/2/10 55.47 18.42 26.11 1041
15
Higher sweep oil efficiency and vertical sweep efficiecy
Drilling core after in-situ combustion
Oil displacement efficiency：>95%Combustion vertical sweep efficiecy : >95%
Drilling core before in-situ combustion
combustion [email protected]
combustion [email protected]
combustion [email protected] combustion [email protected]
7 well groups combustion [email protected]
Higher sweep oil efficiency and vertical sweep efficiecy
3 The Facilitating Key Factors Of High Temperature
In-situ Combustion Mode
Coal fuel combustion conditions
qⅠ
qⅡ
A
B
T
q
TiTe Tb
M
Tm
Diffusion combustion (high temperature
combusiotn)
Dynamic combusiton
Low temperature oxidation
Te ：environment （68~248F）Ti ：ignition （590~698F）Tb：combustion front（>752F）Tm：cut off temperature（716~752F）
Evaluating of combustion conditions
Keep high temperature of igniter
When temperature is more than 470 (870F), H1 oil sample can be ignited by a high temperature mode.
Keep a reasonable air flux
Temperature profile Air flux:10m3/(m2.h)
Temperature profile Air flux:30m3/(m2.h)
Keep a reasonable air flux
H1 project air flux
Temperature field by simulation Air flux:0.15m3/(m2.h)
Temperature field by simulation Air flux:0.05m3/(m2.h)
Reasonable air flux：0.15-0.3 m3/ (m2.h)Minimum air flux：0.05 m3/ (m2.h)
2477
129182234287340392445497550
4 Conclusion
Conclusion
Good production performance is gained in post‐steam heavy reservoir.
High temperature in‐situ combustion mode features high Temperature
of Combustion front , high CO2 content and low H/C Ratio, upgrade oil
composition, high sweep oil efficiency and high recovery factor.
Keep a higher igniter temperature and reasonable air flux can facilitate
a high temperate in‐situ combustion.
Acknowledgment
• Collaborators – Professor Guan Wenlong, Master Wangting and Doctor
Tang Junshi, Senior Geologist Wu Jiang
• Staff in H1 Block ISC Pilot Test in Xinjiang Oilfield Company, PetroChina
Thank you/Questions
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