Turbodrills
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United States of America Patent
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-
Jun 12, 1984
Grant Date -
N/A
app pub date -
Mar 27, 1981
filing date -
Mar 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The turbodrill disclosed consists of a shell (1) attached to the drilling string and provided with an opening (3) in the side surface, a multistage turbine and a hollow shaft (6) supported in the shell (1) by radial bearings (10) and a thrust bearing (11). The bore (7) of the shaft (6) is hydraulically linked up with the drilling string (2) and with a space (15) provided above the nozzles of the bit (13). Seals (16, 17) keeping the drilling fluid out of the space (12) contained where the thrust bearings (11) are provided in an annular space between the shell (1) and the shaft (6). The present invention can be used to advantage in turbodrills employed for the drilling of deep oil and natural gas wells under difficult geological conditions.
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