| 摘要 |
An improved impact tool being attached to a drill stem about ten (10) or more feet above the drill bit, and in drilling mud flows through the impact tool to the drill bit when the well is being drilled. When the drill becomes stuck, plunger means is inserted through the drilling mud passage way from the ground level and is forced down to the impact tool by pressure of the drilling mud, and on reaching the impact tool, it engages a lip forming surface at the upper end of the impact tool and seals off the flow of drilling mud. The pressure placed on the drilling mud flowing from ground level forces a set of sleeves to move downward against the force of a helical spring, causing the drilling mud to flow through a jet contoured nozzle for directing the drilling mud toward the stuck drilling bit for thereby dislodging the drilling bit.
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