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Lessons Learned

Lessons Learned865

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

DNO
2096 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Surface section 22/08/2021 DrilQuip MPT and BOP test tool was sent out without pup joints.

Drilling Supervisor / Morten Laget


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DNO
2013 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational 2/5-15
Gomez		 Top hole 14/08/2021 From among cementers it was decided to disconnect the dust collector before this job. The surge . . .

What does ETM mean?
Drilling Supervisor / Morten Laget


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DNO
2014 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational 2/5-15
Gomez		 Surface section 14/08/2021 The Franks split bushing spider (SBS) did not fit inside the EMSCO rotary table on Borgland Dolphin.

Get in contact with Franks coordinator in town?
Drilling Supervisor / Morten Laget


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DNO
2015 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational 2/5-15
Gomez		 Surface section 14/08/2021 All handling subs had 5 1/2″ size. Had to spend rig time and expose rig crew in red zone changing . . .

Contact all vendors that deliver tools with handling subs to Borgland Dolphin
Drilling Supervisor / Morten Laget


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DNO
2010 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Top hole 12/08/2021 We could not store enough Tuned Light cement on two cmt silos on the rig to get the required volume . . .

Drilling Supervisor / Morten Laget


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DNO
2011 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Rig move 12/08/2021 Scope of work was not sent to OIM or DSV before job. Two men from Schlumberger arrived at rig to . . .

Drilling Supervisor / Morten Laget


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DNO
2012 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Top hole 12/08/2021 ROV was only equipped with standard jetting tool with low flowrate, unable to remove larger amounts . . .

Drilling Supervisor / Morten Laget



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DNO
2006 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 02/08/2021 When pulling 13 3/8″ seal assembly on other wells the choke and kill line failsafes were open . . .

Drilling Supervisor / Stig Seland



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DNO
2005 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 28/07/2021 Volume required was larger that expected for first 20 bar. However from 20 bar to 50 bar the volume . . .

Drilling Supervisor / Stig Seland



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DNO
2004 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 27/07/2021
Franks tong was moved into the drill floor from the starboard tool landing are on the skate through . . .

Drilling Supervisor / Stig Seland



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DNO
1994 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H
Oselvar		 P&A 21/07/2021 Bottom 0.5 m of the toolstring is the Ultrasonic rotating IBCS-E sub. This sub has a larger OD . . .

Drilling Supervisor / Stig Seland



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DNO
1993 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H
Oselvar		 P&A 19/07/2021 Jacked 9 5/8″ free using Baker Mastodon jacking tool. Used 49 pressure cycles to jack casing 17 m, . . .

Drilling Supervisor / Stig Seland



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DNO
1992 – DNO

 		Borgland Dolphin C&P
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 14/07/2021 Sometimes invoice dates does not match with actual backload dates

Drilling Engineer / Stig Seland



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DNO
1990 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 13/07/2021 Set 20″ EZSV at 694,5 m according to procedure. Tagged EZSV with 10 t. Pressured up to 50 bar, no . . .

Drilling Supervisor / Stig Seland



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DNO
1991 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 13/07/2021 Pulled pack off assembly free. Flow checked well. Pulled MPT with pack off assembly above BOP. . . .

Drilling Supervisor / Stig Seland



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DNO
2117 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Other 13/07/2021 Did not not get enough plates from rig and.

Johan Kjos-Hanssen / Stig Seland



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DNO
1970 – DNO

 		Borgland Dolphin Drilling Operational A-3 HT2
Oselvar		 P&A 05/07/2021 The 9 5/8″ casing hanger had a 10″ pup joint made up to it This was not identified on the hanger . . .

Drilling Engineer / Stig Seland



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DNO
1969 – DNO

 		Borgland Dolphin Drilling Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/07/2021
Drill crew observed that Slips for perforating guns came out
to rig without handles.

Øystein Prytz / Stig Seland



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DNO
1968 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 30/06/2021 Initially believed that we did not get a good pressure test (Formation Integrity Test). Suspected . . .

Drilling Supervisor / Stig Seland



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DNO
1930 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 29/06/2021 We had a lot of friction in a long and deviated well A3 with brine.

Drilling Supervisor / Stig Seland



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