CHOA Presentation Nov 26
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Transcript of CHOA Presentation Nov 26
Thermal Wells: An Abandonment Perspective.
Will Butler, P.EngTeam Lead - Engineering
FundamentalsUnderstand current directives, regulations and IRP’s
AER Directive 009 (1990) • Sec. 3 • Sec. 4.2 • Sec. 5
AER Directive 010 (2009)
AER Directive 020 (2010) • Sec. 3 • Sec. 4.2 to 4.6• Sec. 5.1 & 5.4
ID 2003-01
Enform IRP Volume 03
FundamentalsUnderstand current directives, regulations and IRP’s
AER Directive 009 (1990) • Sec. 3 • Sec. 4.2 • Sec. 5
AER Directive 010 (2009)
AER Directive 020 (2010) • Sec. 3 • Sec. 4.2 to 4.6• Sec. 5.1 & 5.4
ID 2003-01
Enform IRP Volume 03
Common Non-compliance Issues Well is not properly isolated with thermal cement across oilsands
formations (internal or external to casing)
Casing/connections not suitable for potential thermal and pressure cycling stresses.
Zonal abandonment of producing intervals was not to current D020 standards
Casing failure/corrosion issues present
SCVF/GM exists
Case 1: Background Vertical well east of Fort McMurray
Rig Release: February 6, 1981
Zonally abandoned and well cut and capped
Compliant in 1981
Currently within 300m of a proposed SAGD project
Case 1: Compliance IssuesSurface cement plug
Prod. casing/connections are inadequate
Cemented with Class G with no returns to surface
BP capped with Class G
Non-routine waiver rejected by AER. Well must be made thermally compliant
Case 1: OperationsStep 1: Drill out surface plug & BP
Case 1: OperationsStep 1: Drill out surface plug & BP
Step 2: Run CBL/VDL to verify cement top and integrity
TOC 25m above sfc. csg shoe
Cement bond is good throughout
Case 1: OperationsStep 1: Drill out surface plug & BP
Step 2: Run CBL/VDL to verify cement top and integrity
Step 3: Section mill & under-ream casing & cement from 109mKB to
below shoe @ 298mKB
AER Oilsands interval requiring thermal isolation
Case 1: OperationsStep 1: Drill out surface plug & BP
Step 2: Run CBL/VDL to verify cement top and integrity
Step 3: Section mill & under-ream casing & cement from 109mKB to
prod. csg. Shoe @ 298mKB
Step 4: Spot continuous thermal cement plug from TD to min. 15m
above sfc. csg. shoe
Final Cost = $450K
Case 2: Background Vertical well south of Fort McMurray
Rig Release: January 11, 2000
Perfs @ McMurray, Wabiskaw & Clearwater formations
Well within proposed steam chamber targeting the McMurray
Client concerned casing may part due to thermal stress created by possible steam chamber contact
Case 2: Compliance Issues
Prod. casing/connections are inadequate
Casing cemented to surface with non-thermal thixotropic cement with good returns to surface (verified by CBL)
The following AER non-routine procedure approved based on engineering assessment of potential wellbore stresses due to steam chamber contact.
Case 2: OperationsStep 1: Remove 38.1mm coil tubing
strings and retrieve Packer @ 407mKB
Case 2: OperationsStep 1: Remove 38.1mm coil tubing
strings and retrieve Packer @ 407mKB
Step 2: Retrieve WR plug @ 416mKB
Case 2: OperationsStep 1: Remove 38.1mm coil tubing
strings and retrieve Packer @ 407mKB
Step 2: Retrieve WR plug @ 416mKB
Step 3: Chemically cut casing in the McMurray formation
@ 460mKB
Case 2: OperationsStep 1: Remove 38.1mm coil tubing
strings and retrieve Packer @ 407mKB
Step 2: Retrieve WR plug @ 416mKB
Step 3: Chemically cut casing in the McMurray formation
@ 460mKB
Step 4: Run & set BP @ 459mKB
Case 2: OperationsStep 1: Remove 38.1mm coil tubing
strings and retrieve Packer @ 407mKB
Step 2: Retrieve WR plug @ 416mKB
Step 3: Chemically cut casing in the McMurray formation
@ 460mKB
Step 4: Run & set BP @ 459mKB
Step 5: Spot continuous thermal cement plug from TD to min. 15m
above sfc. csg. shoe
Final Cost = $90K
Case 3: Background Vertical well north of Red Earth Creek
Rig Release: March 30, 1995
Well is not located within a proposed thermal development
Very little bitumen present in formations in this area
Case 3: Compliance IssuesProd. casing/connections inadequate?
Casing cemented to surface with Class G cement with good returns to surface (verified by CBL)
The following AER non-routine procedure was approved based on very little bitumen in formations and absence of thermal development in area
Condition: Should thermal operations develop within vicinity of the well, it must be remediated to a state that AER deems “thermally compatible”
Case 3: OperationsStep 1: Retrieve 60.3mm tubing
Case 3: OperationsStep 1: Retrieve 60.3mm tubing
Step 2: Spot continuous thermal cement plug from TD to surface
In Conclusion
Know and understand the applicable regulations for thermal areas
Generally, a well is not thermally compliant unless the requirements in D009, D010, D020 & ID 2003-01 are met (Case 1)
Wells may receive AER approval to abandon with alternative methods if sound engineering can be demonstrated (Case 2)
Wells that are non-thermal, but within oilsands areas, may receive AER approval to abandon to D020 requirements, with condition that should area become thermally active, well must be brought into thermal compliance with current regulations (Case 3)
Thank-You