Drilling device for drilling a core in deep drill holes
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United States of America Patent
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-
Jun 5, 1984
Issued Date -
N/A
app pub date -
May 13, 1982
filing date -
May 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a core drilling apparatus wherein a core bit is driven by a hydraulically actuated Moineau type motor, control valve means are provided whereby drilling fluid can be directed through the core sleeve to remove debris from its interior, and, subsequently diverted outside of the core sleeve when drilling begins. Alternative constructions are shown whereby the flushing of the core sleeve can be accomplished with the motor drive in an inactive mode or in an operating mode.
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