WE Report

Lessons Learned

Lessons Learned865


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

DNO
5927 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
N/A 19/09/2023 Mud cooler was used frequently throughout the wells. It was mobilized during Eirik and rigged up . . .

John Langelandsvik / Morten Laget


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DNO
5923 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Reservoir section 17/09/2023 While sampling the MDT Saturn probe got stuck. All attempts to free with wireline tension, cycling . . .

Drilling Engineer / Morten Laget


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DNO
5924 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Reservoir section 17/09/2023 Side door overshot had to be run (provided by Archer with Archer-supplied procedures)

Drilling Engineer


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DNO
5920 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 The cap rock was longer than anticipated, difference form mainbore. The core jammed off in the . . .

Drilling Engineer / Morten Laget


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DNO
5921 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 Core jammed off on all 3 cores.

Drilling Engineer / Morten Laget


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DNO
5922 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 11/09/2023 The BHA took weight on the way down in open hole. Had to ream down on several of the core runs. On . . .

Drilling Engineer / Morten Laget


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DNO
5919 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
N/A 10/09/2023 Done as per plan. For the coring operations a new LCM pill was mixed. The LCM from the 8 1/2″ . . .

Drilling Engineer / Morten Laget


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DNO
5912 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
N/A 06/09/2023 Plugging of transfer lines when taking Microbar from vessels several times.

John Langelandsvik / Morten Laget


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DNO
5908 – DNO

Deepsea Yantai Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 Wireline crew informed in the lesson learned meeting that it was some confusion on when to fire jar . . .

Drilling Engineer / Morten Laget


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DNO
5909 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
P&A 05/09/2023 Due to high percentage of gas in the mud return the interface had to go over the shaker system and . . .

Drilling Engineer / Morten Laget


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DNO
5910 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 High gas in return and losses. Believed to be due to ballooning effect. Once the well was flow . . .

Drilling Engineer / Morten Laget


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DNO
5911 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
Reservoir section 05/09/2023 Time drill to initiate KO with 2 m/hr. Good performance kicking off from mainbore, no problems

Drilling Engineer / Morten Laget


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DNO
5906 – DNO

Deepsea Yantai Operational 25/7-11 S
Norma
Reservoir section 03/09/2023 The primary MDT tool and BU failed. A additional MDT tool was mobilized from Deepsea Stavanger.

Drilling Engineer / Morten Laget


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DNO
5907 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
P&A 03/09/2023 It was not clearly stated in the HLB cement program how the cement calculations should be carried . . .

Drilling Engineer / Morten Laget


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DNO
5873 – DNO

Deepsea Yantai Testing
Own Experience
Operational 25/7-11 S
Norma
Testing 11/08/2023

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DNO
5872 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Surface section 07/08/2023 the ROP is very slow ( 1-2 m/hr) after drilling approximately 1500 meters using XZ816 PDC bit. . . .

Drilling Engineer / Morten Laget


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DNO
5871 – DNO

Deepsea Yantai Planning 25/7-11 S
Norma
01/08/2023 Difficult to see with the ROV at seabed due to poor visibility and loose seabed conduction.

Drilling Engineer / Morten Laget


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DNO
5870 – DNO

Deepsea Yantai Drilling Operational 25/7-11 S
Norma
31/07/2023 Due to build up of cuttings around the wellhead after drilling pilot hole the marker buoys was . . .

Drilling Engineer / Morten Laget


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DNO
5852 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 The pH meter showed indications of cement in return (pH value of 11.6-12.3). Due to poor visibility . . .

Drilling Engineer / Morten Laget


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DNO
5853 – DNO

Deepsea Yantai Drilling
Own Experience
Operational 25/7-11 S
Norma
Top hole 30/07/2023 After the cement of the 30″ conductor was set up the WHRT was released and POOH. Movement was seen . . .

Drilling Engineer / Morten Laget


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