Drill string jarring and bumping tool with piston disconnect

Details Drill string jarring and bumping tool with piston disconnect Drill string jarring and bumping tool with piston disconnect

1975-03-03

1976-04-13

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

E21B 110

Patent

active

039498212

ABSTRACT:
A jarring and bumping tool for a drill string is described. The tool includes an inner mandrel and an outer housing telescopically coupled together and defining therebetween an annular chamber for hydraulic fluid. A floating piston assembly is located in said chamber and is moved along in the chamber by a piston displacing device carried by the mandrel. A vertical strain applied to the mandrel when the tool is in use causes the said device to lift the piston assembly. The pressure of hydraulic fluid in the said chamber cushions movement of the mandrel until the piston assembly enters an enlarged portion of the hydraulic cylinder, whereupon the hydraulic pressure is released, allowing abutment faces on the mandrel and housing to slam together and apply an upward jar to the drill string. When the mandrel is returned downwardly, the piston displacing device draws the piston assembly down in the cylinder until movement of the assembly is arrested. Continued movement of the mandrel causes the device to disengage from the piston assembly, allowing other abutment faces on the mandrel and housing to slam together and apply a downward bump to the tool. Since the piston is disengaged and stationary during a bump, piston and cylinder wear is reduced, and fluid cushioning during a bump is also reduced.

REFERENCES:
patent: 2551868 (1951-05-01), Brady
patent: 2659576 (1953-11-01), Linney
patent: 3889766 (1975-06-01), Sutliff et al.

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