In my last two columns, I wrote about selecting a wire line socket and drilling jars for our drill or tool string. Together with the stem and bit, these components make up the three or four parts of the drill string. I say “three or four” because without jars we have a three-part string and with jars we have a four-part string. Drillers may choose to use jars (or not) in some formations.
The next part of the drill string I’ll discuss is the drill stem. Basically, we have a round steel bar with a male joint at the top and a female joint at the bottom. Running a three-part string, the male end connects to the drill socket. In a four-part string, it connects below the jars.