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downhole

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

Origin of downhole

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for downhole

downhole

adjective
  1. (in the oil industry) denoting any piece of equipment that is used in the well itself
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012