By: Drilling Supervisor
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Report No.
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2207 |
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Discipline/Origin
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Drilling |
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Well
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Fat Canyon |
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Date created
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2021/10/06 |
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Project Phase
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Planning |
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LL Type/Classification
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Planning |
Borgland Dolphin
Other Planning LL with INEOS
Fat Canyon (6306/3-1 S) – Top hole
What happened:
We found shallow gas, and suddenly had to rely on surface equipment (iBOPs on the DDM) as a second barrier on the string.
What was planned:
As we always do, 1 x float installed in both 9 7/8″ and 17 1/2″ BHAs. No expectations of encountering shallow gas.
What was learned:
“Standard practice” only provides one float in each BHA used on Top Hole.
What actions are required:
Consider specifying in the planning stage a second float for each BHA for Top Hole drilling. Double floats in all BHAs are standard practice in UBD (UnderBalanced Drilling) and coiled tubing drilling operations. If we hit shallow gas then we have two barriers on the string side.
Borgland Dolphin
What happened in Top hole:
We found shallow gas, and suddenly had to rely on surface equipment (iBOPs on the DDM) as a second barrier on the string.
As we always do, 1 x float installed in both 9 7/8″ and 17 1/2″ BHAs. No expectations of encountering shallow gas.
“Standard practice” only provides one float in each BHA used on Top Hole.
Consider specifying in the planning stage a second float for each BHA for Top Hole drilling. Double floats in all BHAs are standard practice in UBD (UnderBalanced Drilling) and coiled tubing drilling operations. If we hit shallow gas then we have two barriers on the string side.
EDITOR
CLOSE LL (testing)
New Lesson Learned
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- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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- RIG
Borgland Dolphin- Island Innovator
- Well
Oselvar- Gomez
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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- RIG
- Island Innovator
- Well
- Gråspett
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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- RIG
- Deepsea Bergen
- WELL
- Brasse
- Rungne
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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NO LLs for INEOS- RIG
- Borgland Dolphin
- WELL
- Fat Canyon
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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- RIG
- Deepsea Yantai
- Well
- Shrek
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
-
- PROJECT PHASE
- Operational
- Planning
- Reporting
- CLASSIFICATION
- Positive
- Negative
- Origin
- Own Experience
- Experience Transfer Meeting
- NEA Q&A
- PSA Q&A
- PSA Findings
- DMF
- Norog
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