| 摘要 |
A pulse generator adapted to be connected to a drill pipe string at its upper end and a drill bit at its lower end, the pulse generator providing an external working shock passageway between its exterior and the wall of the bore hole being drilled and an internal counterbalance shock passageway, a shuttle valve in the path of drilling fluid flowing into the generator from the drill pipe string alternately closing the inlets to the shock passageways to alternately generate a negative pressure pulse wave in each passageway and reduce the hydrostatic pressure in the external passage, which includes the bore hole region in which the bit is operating, for the purpose of increasing the drilling rate of the bit in the formation.
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