Definition of down-hole in English:

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down-hole

Pronunciation: /ˈdounhōl/
(also downhole)

adjective& adverb

(In the oil industry) used, occurring, or performed in a well or borehole.
Example sentences
  • Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation
  • Equipment maker Smith International Inc. has announced a 3% to 5% hike for such gear as drill fluids, bits, and downhole drilling tools.
  • This unit is extraordinarily rich in organic carbon (> 50 wt% TOC in some parts, Huc et al. 1992; Herbin et al. 1995) and readily recognizable in the field and in downhole logs.

For editors and proofreaders

Syllabification: down-hole

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