Hydraulic jarring tool

Details Hydraulic jarring tool Hydraulic jarring tool

1984-03-23

1985-11-05

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, E21B 31113

Patent

active

045507899

ABSTRACT:
A hydraulic jarring tool for imparting up-jarring impacts to release a stuck earth boring drill string component is shown. The tool defines upper and lower closed fluid chambers between telescopically moveable concentric cylinders. A fluid metering valve in one fluid passage between the chambers provides limited flow from one chamber to the other and permits telescopic movement at a rate which establishes tension on the drill string and causes the tool to jar. A normally open valve is provided in a by-pass passage between the chambers and is responsive to the fluid velocity therethrough to move to a closed position, restricting fluid flow to pass through the metering valve. However, the tool can be telescopically extended at a somewhat lesser rate insufficient to cause the velocity responsive valve to close thereby permitting the tool to be extended smoothly without a jarring impact.

REFERENCES:
patent: 2344725 (1944-03-01), Phipps
patent: 2678805 (1954-05-01), Sutliff
patent: 2690226 (1954-09-01), Comstock
patent: 2710171 (1955-06-01), Bagnell
patent: 4109736 (1929-08-01), Webb et al.
patent: 4111271 (1978-09-01), Perkins
patent: 4196782 (1980-04-01), Blanton
patent: 4200158 (1980-04-01), Perkins

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