Novel rotary drill bits and drilling process
Patent
·
OSTI ID:6769980
A rotary drilling bit is provided which includes means for providing a protective stream of a high pressure fluid for its cutting edges fed parallel to the drilling axis directed perpendicular to the cutting edges. The drilling bit also includes means for providing a stream of low pressure fluid for flushing away pulverized rock cut by the drilling bit. The drilling bit is mounted on the end of boring tubing made up of a pair of coaxially positioned tubings, the innermost one supplies the high pressure fluid and the outermost one supplies the low pressure fluid. A drilling process which employs the drilling bit and boring tubing efficiently drills through both soft and nonabrasive rock and hard or abrasive rock.
- Assignee:
- Construction De Materiels De Mines S A (France)
- Patent Number(s):
- US 4359115
- OSTI ID:
- 6769980
- Country of Publication:
- United States
- Language:
- English
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