Mechanical jar

Wells – With jar means for releasing stuck part

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Mechanical jar does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mechanical jar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mechanical jar will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1011880

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.