Drilling device with hydraulic percussion generator for earth drilling purposes
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United States of America Patent
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-
Sep 25, 1990
Grant Date -
N/A
app pub date -
Oct 24, 1988
filing date -
Feb 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling device for drilling a borehole and comprising a drilling tool, a drill pipe extending into the borehole for conducting a flow of liquid thereinto for generating an oscillating percussion force applied to the drilling tool, a longitudinally movable impulse tube located below a lower end of the drill tube, a throttle located between a lower mouth of the drill tube and an upper mouth of the impulse tube for controlling a ration of flow portion of the liquid outside and inside the impulse tube in accordance with longitudinal position thereof, and a spring-loaded thrust valve for controlling the flow of liquid inside the tube.
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