07 Contents of the Oil and Gas Well Abandonment Plan

07 components of the oil and gas well termination plan (illustrative photo)

To be specific, Circular 17/2020/TT-BCT clearly stipulates that well termination is the abandonment or preservation of a well or part of an oil and gas well. Before implementing the well termination, the operator shall prepare a well termination plan according to 07 components in Article 5, detailed as follows:

1. Reasons for the well termination.
2. Basic data about the well, summary of the drilling and well completion process; basic data about the exploitation process, the use of the well, geological and geophysical documents of the well, results of quality measurements of the cement bonding outside the production casing and between casings, reservoir pressure, fracture pressure at the casing shoe, and documents related to the well or wellbore sections that need to be abandoned or preserved.
3. Diagram of the well structure detailing: Well depth, depth of casing strings, cement column height in annulus spaces; type and density of the fluid in the well and annulus spaces; types of equipment installed in the wellbore. For deviated and horizontal wells, the diagram must include the kickoff depth, vertical depth, measured depth along the wellbore, inclination angle, and azimuth angle.
4. Methodology for setting mechanical plugs and cement plugs including the plug setting process, type of plugging material, volume of cement slurry and displacement fluid, plug placement intervals, and placement depth, pressure and load test methods with specific test values. For wells to be abandoned, the method and depth of casing cutting must be specified.
5. Plan for clean-up and surveying around the wellhead area before and after well termination, moving or dismantling the rig.
6. Timing and duration of the well termination, plan for periodic inspections for preserved wells.
7. Contingency plan for oil spill response at sea, toxic chemical spill response at sea, marine environmental protection activities in accordance with the law on environmental protection and marine and island resources.

For more details, see Circular 17/2020/TT-BCT effective from September 10, 2020.

Ty Na

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