Downhole percussion drills
AssigneeNational Institute of Advanced Industrial
InventorsHirokazu Karasawa, Tetsuji Ohno, Akinori Ota, Tsutomu Kaneko, Naoto Yamada, Tetsuomi Miyamoto
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Abstract
Provided is a downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, which includes a hydraulic hammering mechanism 7 which uses oil having high lubricating ability as a driving medium, a hydraulic pump 8 which pressurizes the oil, and a downhole motor 9 which drives the hydraulic pump 8.
Claims2
A downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, comprising:
- a hydraulic hammering mechanism, said hydraulic hammering mechanism using a fluid having high lubricating ability as a driving medium;
- a hydraulic pump, said hydraulic pump pressurizing said driving medium;
- and
- a drive unit, said drive unit driving said hydraulic pump.
Dependencies are inferred from the claim text.