well integrity presentation (narrabri ccc 10-2-15)...(source norsok d-010) important for...
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Well Integrity
Office of Coal Seam Gas
Well Integrity – Office of Coal Seam Gas: 10 February 2015
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What is ‘well integrity’?
� Well integrity is defined as “the application of technical, operational and organisational solutions to reduce the risk of the uncontrolled release of formation fluids throughout the life cycle of a well”. (source NORSOK D-010)
� Important for environmental and safety reasons
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Well integrity regulation in NSW
� Schedule of Onshore Petroleum Exploration and Production Safety Requirements (August 1992)
� Code of Practice for Coal Seam Gas Well Integrity (September 2012)
� Work Health and Safety Act 2011� Approvals required before drilling commences
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Well Integrity – Code of Practice
Code-of-Practice-for-Coal-Seam-Gas-Well-Integrity (1).PDF
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Compliance and Enforcement
� OCSG Compliance & Enforcement team focusing on petroleum activities.
� Continuous monitoring and inspections/audits - at all stages (WH&S and environment).
� Focus on compliance with title conditions, legislation, Codes, activity approvals, compliance and management systems etc
� Strategic risk based approach – focus on higher risk activities and titles
� Rehabilitation must be satisfactory to release security deposit.
� Gas Plan will make EPA lead regulator for all compliance and enforcement actions (except safety)
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Notifications - Well Integrity Code of PracticeExcerpt from Section 3.2 Reporting and notification
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Stages of a well’s life
Design� Geology� Well objectives� Engineering
Construct� Drill, Case and Cement� Test/Evaluate� Stimulate
Operate/Maintain� Produce� Well checks� Well optimisation� Well service� Suspension Decommissioning
� Decommission well� Rehabilitate site
(AGL), Ensign Rig 67
(AGL), ST04 Gloucester
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Well construction Typical vertical well
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Components
� Casing is fit for purpose – corrosion, collapse, burst, tension
� Casing is cemented with an engineered cement recipe
� Cement job parameters are recorded� Casing is pressure tested post
cementing� Wellhead
Example of steel casing
Cemented casing cutaway(Summit Casing) Bow Spring Centralisers
Typical Wellhead
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Section of casing AGL Camden Gas Well head infrastructure during drilling, Santos Narrabri
Construction – examples NSW
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Construction - Well Integrity Code of PracticeExcerpt from Section 4.3 Cementing
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Construction - Well Integrity Code of PracticeExcerpt from Section 4.3 Cementing - continued
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Construction - Well Integrity Code of PracticeExcerpt from Section 4.3 Cementing - continued
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Operation / Maintenance
� Well production trends monitored
� Well flowing and annular pressures monitored
� Water volume produced is recorded
� Wellhead seals and surface facilities pressure tested and checked for leaks
Well head infrastructure following drilling prior to partial rehabilitation, Santos Narrabri
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Well servicing
� Can be used to take corrective action for well integrity concerns
� Replace downhole components (such as a worn pump)
� Clean out wells� Replace wellhead components� Repair casing if required� Stimulation
A Service Rig
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Decommissioning
� Well has completed its set objectives� Downhole equipment removed� Well cemented from bottom to top� Surface facilities removed� Wellhead removed and casing cut below surface and
marked with steel plate� Program must be approved by OCSG prior to
commencement
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Decommissioning - Well Integrity Code of PracticeExcerpt from Section 4.9 Well abandonment
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Decommissioning - Well Integrity Code of PracticeExcerpt from Section 4.9 Well abandonment - continued
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Conclusion
� Ultimate goal of well integrity:o to ensure the environmentally sound, safe production of
hydrocarbons by containing them inside the well, o protecting groundwater resources, o isolating the productive formations from other formations, o facilitating proper execution of hydraulic fracturing and
other stimulation operations, ando protecting worker and public safety.� A good casing and cement job is the foundation for good
well integrity� Well Integrity is a life cycle approach – not limited to drilling