Hydraulic drill string accumulator

Details Hydraulic drill string accumulator Hydraulic drill string accumulator

2005-10-11

2005-10-11

Neuder, William (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C092S175000

Reexamination Certificate

active

06953098

ABSTRACT:
A hydraulic accumulator for use in a drill string having a fluid passage for supply of fluid to a hydraulic drill string tool is provided. The accumulator comprises a body provided with connecting means for connecting the accumulator to the drill string and an expansion chamber in fluid communication the fluid passage when the accumulator is connected to the drill string by the connecting means. The expansion chamber is expandable between a first volume and a second volume which is larger than the first volume. Further, the expansion chamber is provided with means for moving the expansion chamber from the first to the second volume upon a fluid pressure increase in the fluid passage and for moving the expansion chamber from the second to the first volume upon a pressure decrease in the fluid passage.

REFERENCES:
patent: 4828048 (1989-05-01), Mayer et al.
patent: 5402854 (1995-04-01), Kimberlin et al.
patent: 5794516 (1998-08-01), Wolfer et al.
patent: 2100558 (1997-12-01), None

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