https://padlet.com/seng289/welldecommissioning last stage of field life cycle, which eliminates the ongoing costs of maintaining uneconomic oil and gas wells, platforms and aging infrastructure. en-us 2022-04-13 01:02:12 UTC 2025-04-24 11:56:45 UTC hello@padlet.com seng289 https://padlet.com/seng289/welldecommissioning/wish/2141726306 - 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.]]> 2022-04-13 01:35:18 UTC https://padlet.com/seng289/welldecommissioning/wish/2141726306 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141734726 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. 

]]> 2022-04-13 01:42:52 UTC https://padlet.com/seng289/welldecommissioning/wish/2141734726 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141739327 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 ]]> 2022-04-13 01:47:05 UTC https://padlet.com/seng289/welldecommissioning/wish/2141739327 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141741718 Step 3: Surface Abandonment

- dismantle and remove all facilities and infrastructure (eg. platform, pipelines, etc) ]]> 2022-04-13 01:49:10 UTC https://padlet.com/seng289/welldecommissioning/wish/2141741718 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141748109 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)]]> 2022-04-13 01:54:31 UTC https://padlet.com/seng289/welldecommissioning/wish/2141748109 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141763922 *compulsory to watch
*take note of the important points. ]]> 2022-04-13 02:08:12 UTC https://padlet.com/seng289/welldecommissioning/wish/2141763922 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141767103 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]]]> 2022-04-13 02:11:07 UTC https://padlet.com/seng289/welldecommissioning/wish/2141767103 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141773916 What are the FOUR(4) main criteria of permanent well barrier (cement plug) ?]]> 2022-04-13 02:17:13 UTC https://padlet.com/seng289/welldecommissioning/wish/2141773916 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141776156 How can we turn decommissioning of oil and gas infrastructure into an opportunity? [Analyse the diagram]]]> 2022-04-13 02:19:03 UTC https://padlet.com/seng289/welldecommissioning/wish/2141776156 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141777990 *please go through]]> 2022-04-13 02:20:38 UTC https://padlet.com/seng289/welldecommissioning/wish/2141777990 seng289 https://padlet.com/seng289/welldecommissioning/wish/2141783004 2022-04-13 02:24:41 UTC https://padlet.com/seng289/welldecommissioning/wish/2141783004