SYSTEMS APPROACH TO MANAGEMENT OF WELL · PDF fileSYSTEMS APPROACH TO MANAGEMENT OF WELL...
Transcript of SYSTEMS APPROACH TO MANAGEMENT OF WELL · PDF fileSYSTEMS APPROACH TO MANAGEMENT OF WELL...
SYSTEMS APPROACH TO MANAGEMENT OF WELL CONTROLTransforming Drilling for Compliance Beyond Macondo, Houston, TX, April 2011
450 Gears Road, Suite 125Houston, Texas 77067
+1-281-875-9860
Systems Engineering integrates all the disciplines and specialty groups into a team effort forming a structured development process that proceeds from concept to production to operation.
Systems Engineering considers both the business and the technical needs of all customers with the goal of providing a quality product that meets the user needs.
International Council on Systems Engineering (INCOSE)
Not managed as a system
No single owner for entire process
Many interfaces: Operator / Drilling Contractor / Service Contractor Onshore / Offshore Planning / Design / Execution Teams
Across interfaces, inadequate: Management of change Risk assessment Control of conflicts, gaps and overlaps
Well
Subsurface Conditions
Surface Conditions
1. Modify well conditions
2. BOP Panel1. Drillstring2. BOP stack
Three part process:
1. Screen to select critical wells
2. Develop model for critical wells
3. Audit against model
Process to rank various wells as to their relative well control risk Scoring / ranking based (among other things) on well Complexity Subsurface Conditions Environmental Sensitivity Well Control Risk Blowout Scenarios Personnel Safety Surface Control Relief Well Risk Corporate Risk Acceptance for Significant Well Control Event
Preliminary Screening
HIGH IMPACTLOW PROBABILITY
(3)
HIGH IMPACTHIGH PROBABILITY
(4)
LOW IMPACTLOW PROBABILITY
(1)
LOW IMPACTHIGH PROBABILITY
(2)
PROBABILITY
IMPACT
Output from preliminary screening is score that places the well on Risk Matrix to enable comparison with other wells drilled by operator or operator’s peer group
Risk of any individual well will be in relationship to other wells.
Application to Well Control
HIGH IMPACTLOW
PROBABILITY(3)
HIGH IMPACTHIGH
PROBABILITY(4)
LOW IMPACTLOW
PROBABILITY(1)
LOW IMPACTHIGH
PROBABILITY(2)
OPERATOR –A 5 Low Impact / Low
Probability Wells (no additional work)
2 High Impact but Low Probability Wells (requires well design certification)
1 High Probability but Low Impact Wells (requires well design certification)
1 High Risk Well (requires well design certification & possible well control audit)PROBABILITY
IMPACT
1111
Basic review of the Well Design by a qualified 3rd Party Subsurface Conditions Casing Drilling Operations Evaluation / Testing Abandonment or Suspension
Performed on all but low risk wells Consists of reviewing the Operator supplied data Basis of Well Design Drilling Program Casing Design Geological Program Policies and Procedures
Hazard – Hydrocarbons In Formation
Hazard Event – Shallow Gas Well Kick / Flow
Threat – Drill Into Gas Deposit
Consequence – Shallow Gas Blowout
Barrier / Control – Circulate Out Kick
Defeating Factors – Mud pumps fail
Basic Bowtie Elements
Audit based on bowtie barriers, including: Operator & drilling contractor policies & procedures Well control critical equipment Training and competency of personnel
Audit confirms that controls and barriers are in place and functioning
Audit program is extensive and recommended only for HIGH risk wells