WE Report

Lessons Learned

Lessons Learned865

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Operator Rig Discipline / Origin Project Phase Well Section Date What Happened

PGNiG
8283 – PGNiG

 		Deepsea Yantai Drilling Operational 6501/10-1
Tomcat		 Reservoir section 15/02/2025 The BU float subs sent out for the operation had wrong/undesired OD. The BU float subs sent out was . . .

Drilling Engineer


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PGNiG
8284 – PGNiG

 		Deepsea Yantai Drilling Operational 6501/10-1
Tomcat		 Reservoir section 15/02/2025 No stethoscope run in the 8 ½” section.

Drilling Engineer


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PGNiG
8286 – PGNiG

 		Deepsea Yantai Drilling Operational 6501/10-1
Tomcat		 Reservoir section 15/02/2025 The weather forecasts are very unreliable, there are often discrepancies between the models. Which . . .

Drilling Engineer


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PGNiG
8287 – PGNiG

 		Deepsea Yantai Drilling Operational 6501/10-1
Tomcat		 Reservoir section 15/02/2025 The overshot initially was not sent out with the Ardyne fishing basket. The overshot was planned out . . .

Drilling Engineer


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PGNiG
4846 – PGNiG

 		Deepsea Yantai Logistics Operational 6608/1-1 S
Copernicus		 Reservoir section 12/09/2022 The BU GVR MWD tool for 8 1/2″ section not at site when drilling the section. The near bit . . .

Drilling Engineer / Morten Laget


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PGNiG
355 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 When P/T lower pipe ram a leak was discovered in the choke line latch coupling between LMRP and BOP . . .


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PGNiG
362 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019
Drilled to core point and POOH. Experienced tool problems on ADR and XBAT (Sonic). HAL onshore was . . .


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PGNiG
363 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Time consuming to test HAL MWD tools onboard.


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PGNiG
364 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Time consuming to handle and M/U BHA.


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PGNiG
365 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Racked core barrels, saving rig time.


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PGNiG
366 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 FIT was performed as planned. Pumped approx. 2 m3 before 8 bar reference pressure was seen.


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PGNiG
367 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Performed FIT to 1.58 sg.


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PGNiG
368 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Drilled 8 1/2″ section with 1.30 sg MW. Based on LWD data from 12 ¼” the predicted PP in the 8 ½” . . .


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PGNiG
369 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Difficult to decide on placement of centralizers for racking since the casing joints vary in lengths . . .


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PGNiG
370 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Reduced torque when drilling out shoetrack resulting in less efficiency.


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PGNiG
371 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 StormGeo faultly predicted the upcoming weather, resulting in new decisions being made based on . . .


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PGNiG
372 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Problems with gas readings from gas trap with flow less than 2000 lpm. Gas trap installed in flow . . .


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PGNiG
373 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019
Odfjell changing out parts of Management (TSL, DSL, OIM) to attend 3 day leadership seminar onshore. . . .


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PGNiG
374 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Getting OBM sent out lith a low O/W ratio (70/30).


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PGNiG
375 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Cores were retrieved successfully.


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