Mechanical drilling jar

Details Mechanical drilling jar Mechanical drilling jar

1976-03-03

1977-01-25

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

166 65M, 175300, 175308, E21B 110

Patent

active

040046435

ABSTRACT:
The specification describes a drilling jar for connection in a rotary drill string. There is a trap space in the jar for collecting the products of wear between its moving parts. The drilling jar includes a generally tubular housing assembly, which has near its bottom, a wash pipe sleeve. There is a tubular mandrel assembly extending into the housing and movable with respect to it, which has near its bottom a wash pipe that slides in the sleeve. An annular trap space is defined near the top of the sleeve between its outer surface and an inner surface of the housing. Wear products are collected in the trap space and thereby prevented from entering between the wash pipe and sleeve where they would cause abrasion.

REFERENCES:
patent: 1798337 (1931-03-01), Newsom
patent: 1889283 (1932-11-01), Francis
patent: 2818232 (1957-12-01), Osmun
patent: 2819876 (1958-01-01), Ransom
patent: 3371730 (1968-03-01), Newman
patent: 3392795 (1968-07-01), Greer
patent: 3585301 (1971-06-01), Newman

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