Double-acting accelerator for use with hydraulic drilling jars

Details Double-acting accelerator for use with hydraulic drilling jars Double-acting accelerator for use with hydraulic drilling jars

1991-08-15

1993-08-03

Bagnell, David J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, E21B 414

Patent

active

052320600

ABSTRACT:
A double acting accelerator 1 includes a mandrel 2 arranged in a housing 3 for sliding longitudinal movement. A pair of pistons 89, 111 are positioned radially between the housing 3 and mandrel 2 to form a substantially sealed chamber 88 longitudinally therebetween. Movement of the mandrel 2 in a first direction urges the first piston 89 toward the second piston 111, thereby greatly increasing the pressure of fluid in the chamber 88. Movement of the mandrel 2 in a second, opposite direction urges the second piston 111 toward the first piston 89 to, likewise, greatly increase the pressure of fluid in the chamber 88. Thus, a large amount of energy is stored in the accelerator 1 independent of the relative direction of movement of the mandrel 2 and housing 3.

REFERENCES:
patent: 4109736 (1978-08-01), Webb et al.
patent: 4361195 (1982-11-01), Evans
patent: 5086853 (1992-02-01), Evans

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