Mechanical jar

Details Mechanical jar Mechanical jar

1985-04-22

1987-03-03

Leppink, James A.

Wells

With jar means for releasing stuck part

175299, 175304, E21B 31107

Patent

active

046468307

ABSTRACT:
A mechanical jar having a variable diameter tension ring which can be reciprocated from a large into a small diameter chamber and vice versa. When a fishing tool is connected to the jar, the jar is run downhole and set down, and a mandrel retracts into a barrel, causing a collet to move the ring into the large diameter chamber whereupon the ring expands to a large diameter and telescopingly receives the collet fingers therewithin. As the jar is picked up, the mandrel moves the ring from the large to the small diameter chamber, thereby reducing the diameter of the ring. This action releasably latches the ring and the collet fingers together. Accordingly, a very large axial force must be applied to the mandrel in order to cause the collet to be released from the ring; and, a very small reverse axial force is required for the collet to latch onto the ring. When the ring releases the collet, the mandrel accelerates a hammer which strikes an anvil with great force, thereby providing uphole thrust on the barrel and on any member which may be attached thereto.

REFERENCES:
patent: 1798337 (1931-03-01), Newsom
patent: 1885043 (1932-10-01), Beck
patent: 1895227 (1933-01-01), McCullough
patent: 1989907 (1935-02-01), Beck
patent: 2241477 (1941-05-01), Rasmussen
patent: 2962098 (1960-11-01), Conrad
patent: 3406770 (1968-10-01), Arterbury et al.

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