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- Decommissioning is the term used to describe the final stage of an energy project.

- In oil and gas, when a field production comes to an end or uneconomical.

- The wells will be permanently abandoned, facilities and infrastructure will be dismantled and the surrounding area returned to its natural condition.

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(STEP 1) How is oil and gas decommissioning carried out? 

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(STEP 1) How is oil and gas decommissioning carried out? 

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Step 1: Project Planning: design abandonment program

- identify any issues with the well that could lead to potential leaks (eg. cracks, cement integrity of casing annulus) and to identify all oil and gas formations and all groundwater zones.

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(STEP 2) How is oil and gas decommissioning carried out? 

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(STEP 2) How is oil and gas decommissioning carried out? 

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Step 2: Subsurface Abandonment: plug and abandon wells

By plugging cement plugs into the wells at various depths and remove the wellhead and casing to a depth of about 2 metres below the surface or seabed.

NOTE: Minimum of TWO Well Barriers

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(STEP 3) How is oil and gas decommissioning carried out?

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(STEP 3) How is oil and gas decommissioning carried out?

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Step 3: Surface Abandonment

- dismantle and remove all facilities and infrastructure (eg. platform, pipelines, etc)

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(STEP 4) How is oil and gas decommissioning carried out? 

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(STEP 4) How is oil and gas decommissioning carried out? 

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Step 4: Restore the site

- site is restored to its original condition
- conduct a final environmental impact study

(Note: look at the tree...compare during abandoned and reclaimed)

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Lecture Note - reading material [9 pages only]

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Lecture Note - reading material [9 pages only]

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*please go through

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Video: Permanent Barrrier Requirements for Well Plug & Abandonment 

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Video: Permanent Barrrier Requirements for Well Plug & Abandonment 

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*compulsory to watch
*take note of the important points.

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Permanent barrier requirements for P&A.mp4

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Test your knowledge: Exercise 1 (scroll down for the questions)

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Test your knowledge: Exercise 1 (scroll down for the questions)

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Shown is a well schematic diagram.

1. Discuss how the well abandonment is to be carried out.

2. Identify three areas in the schematic diagram which the cement plugs are to be set.

[Note: write your answer on paper. we discuss in next class]

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What are the FOUR(4) main criteria of permanent well barrier (cement plug) ?

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How can we turn decommissioning of oil and gas infrastructure into an opportunity? [Analyse the diagram]

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End of Lecture. Please list down your questions to ask in next class. Kindly complete all exercises.

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End of Lecture. Please list down your questions to ask in next class. Kindly complete all exercises.