underream

underream

[¦ən·dər¦rēm]
(engineering)
To enlarge a drill hole below the casing.
References in periodicals archive ?
Selected coal seams have been underreamed and will be jetted to instigate cavitation of the seams around the well bore after the seams have been logged.
Comments: A number of studies of individual and group behavior of deep foundations have been carried out at this site: driven and bored piles, underreamed and straight-shafted piers.
Selected coal seams in the three new appraisal wells - Paranui #11, 12 and 13 will be underreamed and cavitated before the wells are completed for testing of gas and water flows.
The coal seams will be logged, underreamed and cavitated and the well will be suspended for later production testing.
The coal seams have been underreamed and cavitated and the well has been suspended for later production testing.
After reaching target depth, the well will be logged and selected coal seams will be underreamed and cavitated.
The coal seams have been underreamed and are being cavitated further.
The Paranui #11 well will be logged with all coal seams to be underreamed and then cavitated.
Four seams were underreamed and the well was suspended for further appraisal testing.