Example of Service Company Process
- Software
- Procedure
Determining the Uncertainty
- Ask the Operator
- Doesn’t know? - Ask Rig Positioning/Land Survey company
- Doesn’t know? - Ask what survey method was used
- Doesn’t know? - Use conservative default
- Operator doesn’t like it? – Return to step 1
Determining the Uncertainty
- Operator’s rig positioning spec isn’t what we want – Refers to nominal position
Alternative Default
- Zero
- Much more popular!
Application Logic – Automated in Software
- Target Sizing
- Facility and Slot (RSS’d)
- Collision Avoidance
- Offset from same Facility - Slot only
- Offset from different Facility - Facility and Slot (RSS’d)
- Possible conflict with infrastructure naming convention
- May require compromise
- Compromise must not undermine location uncertainty logic
Include or Exclude?
- Target Sizing – Recommend
- Collision Avoidance – Insist on
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Managing Surface Location Uncertainty
Harry Wilson