WE Report

Lessons Learned

Lessons Learned865

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

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
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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DNO
1217 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 24/03/2012
DONG handover documentation:
When circulating prior to cementing initial pressure was 79 bar / . . .

Karina Helle / Morten Laget


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DNO
1218 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 24/03/2012 DONG handover documentation: The Odfjell CRTi (Casing Running Tool internal) was used to fill casing . . .

If using CRTi as a contingenct again is should be used together with auto filling shoe, this way . . .
Karina Helle / Morten Laget


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DNO
1216 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 11/03/2012 DONG handover documentation: While running the 13 3/8″ casing, the casing tong was not lowered all . . .

Karina Helle / Morten Laget


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