1.
vb. [Drilling]
To prepare a well to be closed permanently, usually after either logs determine there is insufficient
hydrocarbon potential to complete the well, or after
production operations have drained the
reservoir. Different regulatory bodies have their own requirements for plugging operations. Most require that cement plugs be placed and tested across any open hydrocarbon-bearing formations, across all casing shoes, across freshwater aquifers, and perhaps several other areas near the surface, including the top 20 to 50 ft [6 to 15 m] of the wellbore. The well designer may choose to set bridge plugs in conjunction with cement
slurries to ensure that higher density cement does not fall in the wellbore. In that case, the bridge plug would be set and cement pumped on top of the plug through
drillpipe, and then the drillpipe withdrawn before the
slurry thickened.