The deepest hole in the world is the Z-44 Chayvo well just off the island Sakhalin, Russia. Completed in August of 2012, the well reaches a total depth of 12,376 meters (40,604 ft - over 7.6 miles), surpassing previous records, including that of the Kola Superdeep Borehole.
I've worked on some deep holes, some being very close to the Bertha Rogers well in Oklahoma. One well was so deep near the completion depth, I was told the drill bit never got off bottom when making a connection due to the stretch in the drill string (pipe). A length of drill pipe is approx. 30 ft. long, so the fact that steel can stretch so far under its own weight is mind-boggling...at least it is to me.
I've worked on some deep holes, some being very close to the Bertha Rogers well in Oklahoma. One well was so deep near the completion depth, I was told the drill bit never got off bottom when making a connection due to the stretch in the drill string (pipe). A length of drill pipe is approx. 30 ft. long, so the fact that steel can stretch so far under its own weight is mind-boggling...at least it is to me.
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