A well is abandoned when it reaches the end of its useful life or is a dry hole.
Hazards may be related to the following:
The rig is used to remove the casing and plug the well. The wellhead is removed. After the casing is cut off, it is removed.
Cement plugs are placed in the borehole to prevent migration of fluids between the different formations. This also prevents the migration of gas or fluids to the surface.
Usually the first casing to be run in a well. This is done after spudding-in so a blowout preventer can be installed before drilling is started.†
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