underreamern.
Oil Industry.
A drilling bit that can be used to drill a hole below the casing, of sufficient size for the casing to be lowered further.
ΘΚΠ
society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > drilling equipment > drilling bits
roller bit1858
rock bit1875
spudding bit1907
underreamer1912
oil string1921
spudder1922
1912 E. H. C. Craig Oil-finding viii. 150 Thus through a thick soft argillaceous group it may be found most profitable to use a rotary rig, while drop drills and under-reamers may suit a variable series containing hard calcareous bands.
1939 D. Hager Fund. Petroleum Industry viii. 186 If for any reason the hole has been cased at a certain depth and it is necessary to carry the same diameter of hole deeper without removing the casing, an underreamer is used.
Derivatives
ˈunderreaming n.
ΘΚΠ
society > occupation and work > industry > drilling for oil or gas > [noun] > other procedures
jar1865
run1880
round trip1900
shooting1914
swabbing1921
underreaming1922
acidization1934
squeeze cementing1938
mud logging1960
re-entry1961
stab1972
upending1976
1922 D. T. Day Handbk. Petroleum Industry I. 246 Underreaming is accomplished through the medium of an ingeniously designed bit (termed an ‘underreamer’ because it reams under the casing).
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019).
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n.1912