Definition of "downhole" [downhole]

• Occurring in the drilled bore of an oil well either underground or undersea. (adjective)

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• "A few days after, I heard that they had suffered some kind of downhole failure and the Coast Guard had ordered a halt to the procedure."
• "Optical fiber sensor technology, designed to operate under "downhole" conditions, that allows efficient and economic recovery of petroleum by providing reliable, cost-effective, real-time measurement and monitoring of key physical wellbore parameters such as pressure, temperature, flow and acoustic wave patterns."
• ""The combination of Schlumberger real-time downhole formation sampling measurements with Geoservices 'drilling mud analysis will help customers better identify and react to drilling hazards," said Chairman and Chief Executive Andrew Gould."