1. The SAGD process will increase the reservoir pressure
which alters the local stress state and can induce
deformations in the caprock. Loss of caprock integrity by
these changes may lead to the release of steam into
overlying aquifers or to the surface, causing significant
economic penalties, as well as environmental and safety
issues. In addition, the cement sheath, an important
wellbore protection element will also experience extreme
temperature fluctuations and associated stress changes
which may result in incomplete zonal isolation and an
inability to protect wellbore integrity.
BACKGROUND
Xiangyu Li, Ehab Hamza and Rick Chalaturnyk
University of Alberta
Properties of Caprock and Cements for SAGD Wellbore Integrity Modeling
METHODOLOGY
TEXT
Why / PURPOSE
Gaurina-Medjimurec, N., & Pasic, B. 2013. CO2 Underground Storage and Wellbore Integrity. Risk Analysis for Prevention of Hazardous Situations in Petroleum and Natural Gas Engineering, 322.
Tonn, R. 2010. Depth Conversion and Seismic Lithology Inversion of a McMurray Oil Sands Reservoir. CSEG Recorder, November, 26-35.
Xu, B., Yuan, Y. G., & Wang, Z. C. 2011. Thermal impact on shale deformation/failure behaviors---laboratory studies. In 45th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association.
Thus it is important to investigate the primary caprock
and oil well cement constitutive properties. Accordingly,
a numerical simulation is used to analyze SAGD
wellbore behavior influenced by the steam chamber.
Both caprock and cement constitutive model are
experimentally determined.
Workflow for Assessing Well Integrity in SAGD Project
1) Caprock (Wabiskaw) Experimental Program
Input Experimental
Properties
2) Well Cement Experimental Program
3) Assessment of Steam Chamber Impacts on Strat
Wells Abandoned with Nonthermal Cement
A comprehensive laboratory testing program was performed on a
high quality, undisturbed, core sample. The testing program
included 1) microstructure analysis; 2) isotropic consolidation; and
3) permeability determination.
2016 SUMMIT: Foundation CMG School, AGM, Chair Meeting & Technical Symposium
Full 3D reservoir geomechanical SAGD simulations of
abandoned well. With improved cement constitutive
behavior parameters obtained from the experimental
program, a sensitivity study is conducted.
Geometry of Geomechanical model
Caprock Hydrostatic
Testing System
Well Cement Triaxial
Testing System
1) Caprock (Wabiskaw)
Permeability Function for Fluid - Mechanical Coupling
Modified Cam-Clay Model Calibration
2) Well Cement
Variation in Unconfined Young’s Modulus with Temperature
Direct Shear: Cement-Shale Interface
3) Results of Numerical Simulation
Choose wellbore location in the
Geomechanical Model
Displacements imposed on
Wellbore Boundaries
Progression of ‘i’ direction
Displacement at the
specified well location
Reservoir Geomechanics Research Group [RG]2
Foundation CMG Industrial Research Consortia in Reservoir Geomechanics for Unconventional Resources
RESULTS
![The SAGD process will increase the reservoir pressure
which alters the local stress state and can induce
deformations in the caprock. Loss of caprock integrity by
these changes may lead to the release of steam into
overlying aquifers or to the surface, causing significant
economic penalties, as well as environmental and safety
issues. In addition, the cement sheath, an important
wellbore protection element will also experience extreme
temperature fluctuations and associated stress changes
which may result in incomplete zonal isolation and an
inability to protect wellbore integrity.
BACKGROUND
Xiangyu Li, Ehab Hamza and Rick Chalaturnyk
University of Alberta
Properties of Caprock and Cements for SAGD Wellbore Integrity Modeling
METHODOLOGY
TEXT
Why / PURPOSE
Gaurina-Medjimurec, N., & Pasic, B. 2013. CO2 Underground Storage and Wellbore Integrity. Risk Analysis for Prevention of Hazardous Situations in Petroleum and Natural Gas Engineering, 322.
Tonn, R. 2010. Depth Conversion and Seismic Lithology Inversion of a McMurray Oil Sands Reservoir. CSEG Recorder, November, 26-35.
Xu, B., Yuan, Y. G., & Wang, Z. C. 2011. Thermal impact on shale deformation/failure behaviors---laboratory studies. In 45th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association.
Thus it is important to investigate the primary caprock
and oil well cement constitutive properties. Accordingly,
a numerical simulation is used to analyze SAGD
wellbore behavior influenced by the steam chamber.
Both caprock and cement constitutive model are
experimentally determined.
Workflow for Assessing Well Integrity in SAGD Project
1) Caprock (Wabiskaw) Experimental Program
Input Experimental
Properties
2) Well Cement Experimental Program
3) Assessment of Steam Chamber Impacts on Strat
Wells Abandoned with Nonthermal Cement
A comprehensive laboratory testing program was performed on a
high quality, undisturbed, core sample. The testing program
included 1) microstructure analysis; 2) isotropic consolidation; and
3) permeability determination.
2016 SUMMIT: Foundation CMG School, AGM, Chair Meeting & Technical Symposium
Full 3D reservoir geomechanical SAGD simulations of
abandoned well. With improved cement constitutive
behavior parameters obtained from the experimental
program, a sensitivity study is conducted.
Geometry of Geomechanical model
Caprock Hydrostatic
Testing System
Well Cement Triaxial
Testing System
1) Caprock (Wabiskaw)
Permeability Function for Fluid - Mechanical Coupling
Modified Cam-Clay Model Calibration
2) Well Cement
Variation in Unconfined Young’s Modulus with Temperature
Direct Shear: Cement-Shale Interface
3) Results of Numerical Simulation
Choose wellbore location in the
Geomechanical Model
Displacements imposed on
Wellbore Boundaries
Progression of ‘i’ direction
Displacement at the
specified well location
Reservoir Geomechanics Research Group [RG]2
Foundation CMG Industrial Research Consortia in Reservoir Geomechanics for Unconventional Resources
RESULTS](https://image.slidesharecdn.com/bb85643f-37ec-4f61-a599-e287ebc0d48f-160917030338/85/UofA-FCMG-IRC-Poster-Xiangyu-Ehab-FINAL-1-320.jpg)
