down hole

downhole

[doun-hohl]
noun
1.
a hole dug or drilled downward, as in a mine or a petroleum or gas well.
adjective
2.
occurring or situated in such a hole.

Origin:
down1 + hole

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World English Dictionary
downhole (ˈdaʊnˌhəʊl)
 
adj
(in the oil industry) denoting any piece of equipment that is used in the well itself

Collins English Dictionary - Complete & Unabridged 10th Edition
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