Borehole Drilling Method

sidewall core bullet

notation 8.1 more like this
definition Percussion cores are taken by firing hollow bullets into the formation. The bullets are attached to the tool by fasteners, and are retrieved, along with the core inside, by pulling up the tool and the fasteners. Percussion coring tools typically hold 20 to 30 bullets, but two or three tools can be combined on one run in the hole. more like this
source This vocabulary more like this
broader sidewall core
narrower sidewall core bullet
in scheme boreholedrillingmethod
is primary topic of sidewall core bullet