WE Report

Lessons Learned

Lessons Learned865

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

Faroe
168 – Faroe

 		Deepsea Bergen Well test Operational 31/7-2 S
Brasse Appraisal		 N/A 28/09/2017 Changing out subsea test tree, from 10 to 15 k


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Faroe
169 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 P&A 28/09/2017 In DOP for pulling 9 5/8″ seal assembly, it was planned “Pick up with 3 ton overpull to check MPT . . .


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Faroe
170 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017 During displacement from WBM to OBM (while drilling out cement), attempted to u-tube kill and choke . . .


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Faroe
171 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017 Skips were not practical and required a lot of manual handling to operate. The lids are heavy and . . .


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Faroe
172 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017
After making up the 9 5/8″ liner hanger circulation was attempted established with 2000 lpm. Losses . . .


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Faroe
174 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Reservoir section 28/09/2017 When logging the 9 5/8” casing cement it was discovered during a repeat pass that the cement logs . . .


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Faroe
175 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 P&A 28/09/2017 8 hrs were used cutting the extension joints. During the cutting a high stick-slip was observed by . . .


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DNO
1231 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 06/06/2012 DONG handover documentation: The OCG 15 section 8.51 states to pump TSW when pressure testing the . . .

Use normal SW, this is available at the cement unit. The fluid will anyway be bleed back after . . .
Karina Helle / Morten Laget


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DNO
1229 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 12/05/2012 DONG handover documentation: Confusion due to joints marked with two different joint numbers (in . . .

If reuse of pipe: Hide old joint number with paint and mark with new number. Use either white or . . .
Karina Helle / Morten Laget


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DNO
1230 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 12/05/2012 DONG handover documentation: Again challenges where seen due to backflow when RIH on DP / HWDP. . . .

In future include a flapper valve in the running string. Either below hanger setting tool (just . . .
Karina Helle / Morten Laget


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DNO
1228 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 11/05/2012 DONG handover documentation: When drilling 8-1/2″ with 9-1/4″ underreamer a section of the hole was . . .

When circulating at TD, position string so calliper can verify ID’s above and below UR shoulder. If . . .
Karina Helle / Morten Laget


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DNO
1222 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature.
Karina Helle / Morten Laget


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DNO
1223 – DNO

 		Borgland Dolphin HSEQ
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature.
Karina Helle / Morten Laget


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DNO
1224 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature. Alternative larger coolers on . . .
Karina Helle / Morten Laget


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DNO
1225 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to the mud cooler the mud temperature was lower, this resulted in . . .

When planning to use a mud cooler consider effects on downhole mud temperature, weight and rheology . . .
Karina Helle / Morten Laget


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DNO
1226 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: The deactivation of the underreamer was not done on the bit trip due to . . .

Do not spend time deactivating unless circulating at the shoe for another reason (conditioning mud). . . .
Karina Helle / Morten Laget


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DNO
1227 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 05/05/2012 DONG handover documentation: After dropping the ball to activate the underreamer the string was . . .

As it looks like ball hangs up in string when not rotating, rotation should be initiated shortly . . .
Karina Helle / Morten Laget


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DNO
1221 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 22/04/2012 DONG handover documentation: During the scraping of the EZSV plug and Whipstock setting area the . . .

To avoid problems with hole instability during circulation (losses) the lowering of the mudweight . . .
Karina Helle


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DNO
1220 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 15/04/2012 DONG handover documentation: Started to get backflow when running the last 10 joints of blank pipe . . .

Change the OCG to prevent using excessive time on this in the future. Prepare a pit with heavy . . .
Karina Helle / Morten Laget


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DNO
1219 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 25/03/2012 DONG handover documentation: When running in with the seal assembly on MUT, the bullnose on the pipe . . .

In future run one more stand below MUT, so bullnose is stabbed into casing before picking up seal . . .
Karina Helle / Morten Laget


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