This invention is directed to a release mechanism for a mandrel of a jarring device commonly referred to as a jar. Jars are used in the well drilling industry to free downhole tools that may become lodged in a well. An upward or downward force can be supplied to a tubular string which includes the affected tool in order to break free the tool from the well bore.
Typically, a release mechanism in the form of an annular collet is provided which normally prevents axial movement of the mandrel. The mandrel is spring biased to move with significant force in an upward or downward direction. If a sufficient force is placed on the mandrel, the collet will release.
U.S. Pat. No. 5,022,473 discloses a release assembly which comprises a plurality of angular segments 62 and 162 that engage in slots 86 and 88, and 186 and 188 respectively. It has been found that this arrangement can result in the segments 62 and 162 becoming out of alignment which could result in the failure of the release mechanism. As disclosed in the patent, the jar requires two sets of release lugs to withstand the anticipated tensile load. In this design the two lug assemblies must be spaced further apart than the total travel of the jar to prevent the lower lug from inadvertently engaging the groove of the upper lug assembly. If a third lug assembly were necessary it would have to be spaced a distance greater than the jar stroke from the lower set. This would significantly increase the total length of the jar and also the cost.
The present invention solves the above noted problem by providing a plurality of angular lug segments each of which has two or more projections that engage corresponding grooves in the mandrel.
In order to avoid misalignment or a jarring situation, the projections having either a differing width or are spaced at different distances. The grooves on the mandrel have a complimentary configuration as will be explained below.
The jar includes a central housing 11, a Belleville spring stack 12, a restrictor orifice 14 and one or more check valves 13, an annular sleeve 15 surrounding mandrel 21 and an annular trigger sleeve 16 having an inwardly projecting lip 33. Annular trigger sleeve 16 is spring biased against a shoulder 9 provided in housing 11 by a spring 19 at lip 33. A lubricant fitting housing 151 is threadedly coupled to the downhole portion of housing 11.
As shown in
In the rest position shown in
In order to reload the jar, a downward force is placed on the mandrel which will move the mandrel downward. The garter springs 38 will cause the release lugs to return to their original position with the projections 18 in grooves 32.
Spring 19 which is now compressed will move trigger sleeve 16 back to the neutral position shown in
The jarring tool of
The interior surface of each release lug includes a plurality of angular projections 235 and a plurality of angular grooves 233 between the projections that are adapted to interface with projections and grooves formed on the outer surface of a mandrel 21 in the manner shown in
Each release lug also includes a pair of grooves 240, 241 that are adapted to receive annular leaf springs 230, 231 shown in
Although the present invention has been described with respect to specific details, it is not intended that such details should be regarded as limitations on the scope of the invention, except to the extent that they are included in the accompanying claims.
This application is a continuation in part application of U.S. patent application Ser. No. 14/621,577 filed Feb. 13, 2015, the entire contents of which is hereby incorporated herein by reference thereto.
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Number | Date | Country | |
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20190055804 A1 | Feb 2019 | US |
Number | Date | Country | |
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Parent | 14621577 | Feb 2015 | US |
Child | 16168610 | US |