A Proactive Approach to Blowout Prevention Equipment Risk Assessment
Determining “Retrieve BOP to Surface” or “Continue Operations” in
Deepwater Operations
BSEE Technical Forum on Next-Generation Blowout Preventer (BOP) and Control Systems
Technology, Management and Regulations May 22nd 2012
Agenda
• The challenge
• The solution
• BOP Analysis
• BOP Model
• Defense-in-Depth
• Continual Benefits
• Develop the capability to “based on input” assess risk and reliability instantaneously and communicate to all interested parties effectively • Generate a method of communication • Account for the full capabilities of any BOP
The Challenge
The Question When does a BOP failure or failures affect the reliability or
functionality to levels such that continued operations cannot be maintained in the operational circumstance it is intended to
perform?
The Solution BOP Risk Modelling • Built in Risk Spectrum software specifically designed for real time
assessments • Customized and BOP specific • Risk Spectrum modules utilized:
– Block Diagrams(Connections and interconnections) – FTA (Fault Tree Analyses) Logic Application – PSA (Fault Tree and Event Tree Analysis) – FMEA (Failure Mode and Effect Analyses) validation and verification – Risk Watcher (Dashboard Risk Monitoring)
Result: – Instant display of revised risk levels for all stakeholders and
regulators in a reliable and standardized way of communicating effectively
The BOP Risk model BOP main functions
The BOP Risk model Reliability block diagrams
Fault Tree Modeling of BOP Failures (1)
BOP not closed (overbalanced)
BOP_OB
Non-shearable equipment in BOP
@BOP_OB-1
Overbalanced operation with non-shearable equipment in BOP
EQU_OB
Fails to pull out or drop non-shearable equipment
PUOUT
Shear ram failure
@BOP_OB-2
Failure of casing shear ram
CASRAM
Failure of blind shear ram
BLIRAM
Signal transmission failure
TRANS
Hydraulic failure
HYD
The BOP Risk model BOP main functions
Upper Annular 100% Complete
Riser Connector 100% Complete
Lower Annular 100% Complete
Upper Blind Shear Rams 100% Complete
Lower Blind Shear Rams 100% Complete
Super Shear Rams 100% Complete
Upper Pipe Rams 100% Complete
Middle Pipe Rams 100% Complete
Lower Pipe Rams 100% Complete
Wellhead Connector 100% Complete
Fail to Open
Fail to close
Fail to Seal the Hole
Fail to Open
Fail to close
Fail to Seal the Hole
Fail to Unlock
Fail to Lock
Fail to Open
Fail to Shear and seal
Fail to Unlock
Fail to Lock
Fail to Open
Fail to Shear and seal
Fail to Open
Fail to Shear
Fail to Open
Fail to Close
Fail to Open
Fail to Close
Fail to Open
Fail to Close
Top Events
BOP Analysis In Review
• Analyze complete BOPs on component and systems levels in Fault Tree logic
• Examine how a fault affects the BOP and
it’s redundancy or reliability levels • This analysis will generate a “BOP model” • The “BOP model” can now be
interrogated by anyone in an industry recognized way
BOP Model
• Representation of the “BOP Model” • Illustrates operational status of the
BOP • Fault manually entered upon
diagnosis • Instant displays of new risk levels
Industry consensus will define each level of risk
Unacceptable Risk
“Retrieve BOP to Surface”
High Risk “Additional Risk Assessment of Variables”
Moderate Risk System Maintenance Required
Low Risk Functional Capabilities Available
Defense In Depth User interface in RiskWatcher
Defense In Depth User interface in RiskWatcher
Defense In Depth User interface in RiskWatcher
Defense In Depth User interface in RiskWatcher
Defense In Depth User interface in RiskWatcher
Defense In Depth User interface in RiskWatcher
Continual Benefits • Instant verification of new risk levels to all stakeholders and regulators • BOP analyzed by “independent” risk and BOP subject matters experts
• When completed ad-hoc, equipment owners, operators and additional
stakeholders do not rely solely on risk analysis by BOP subject matter expert risk assessments and decision making during the stress of a potential downtime event.
• Decrease close involvement of stakeholders • Assurance BOP model was created by subject matter experts and validated
upfront through risk assessment and can now be communicated effectively to all including regulator’s and can be thoroughly assessed and scrutinized in an informed unbiased way.
QUESTIONS ????
For more information, please contact: Garry Davis Manager Global Center Of Excellence T +1 281 649 2761 M +1 823 578 5395 E [email protected]