EP3572616A1 - Freisetzungslaschen für eine einmachvorrichtung - Google Patents

Freisetzungslaschen für eine einmachvorrichtung Download PDF

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Publication number
EP3572616A1
EP3572616A1 EP19172632.2A EP19172632A EP3572616A1 EP 3572616 A1 EP3572616 A1 EP 3572616A1 EP 19172632 A EP19172632 A EP 19172632A EP 3572616 A1 EP3572616 A1 EP 3572616A1
Authority
EP
European Patent Office
Prior art keywords
release
mandrel
lugs
grooves
projections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19172632.2A
Other languages
English (en)
French (fr)
Inventor
Robert W. Evans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US15/973,247 external-priority patent/US10408009B2/en
Application filed by Individual filed Critical Individual
Publication of EP3572616A1 publication Critical patent/EP3572616A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars

Definitions

  • 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.
  • a release mechanism in the form of an annular collet 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. Patent 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.
  • 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.
  • the projections In order to avoid misalignment or a jarring situation, the projections have either a differing width or are spaced at different distances.
  • the grooves on the mandrel have a complementary configuration as will be explained below.
  • FIG. 1 illustrates a release mechanism including a plurality of release lugs 17 surrounding mandrel 21 of the jar such as that shown in FIG. 9 .
  • 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.
  • each release lug 17 includes a plurality of projections 18 of varying width on its interior surface. Projections 18 in this embodiment are evenly spaced from each other.
  • the exterior surface of the release lug includes a plurality of grooves 37 which are adapted to receive projections 36 of the trigger sleeve 16 as shown in FIG. 4 .
  • a plurality of smaller grooves 41, 42, 43 and 44 are also provided on the exterior surface of release lugs 17 and are adapted to hold garter springs 38 as shown in FIG.6 .
  • a plurality of the release lugs are used to form a release mechanism as shown in FIG. 6 having spaces 45 between the release lugs. Although six release lugs are shown any number of segments for example, 2 thru 12 may be used.
  • the release lugs 57 have been changed to include a plurality of projections 58 that are non-uniformly spaced apart from each other rather than having varying widths.
  • the grooves 59 in the mandrel are also spaced apart accordingly to receive projections 59 in the neutral position as shown in FIG. 7 .
  • the outer surfaces of the release lugs are formed in the same fashion as the lugs shown in FIG. 5 so that in the released position of FIG. 8 , surfaces 35 of the release lug are located within grooves 31 of the trigger sleeve 16.
  • FIG. 9 illustrates an embodiment of a complete jarring tool that incorporates the release lugs of the embodiment shown in FIGS. 7 and 8 .
  • the jar includes a connector 100 for connecting the jar to a tubular string, upper housing members 102 and 103, lubricating fitting 104, central housing 11, a lower lubricating fitting 151, lower housing member 152 and lower connector 141.
  • the jar also includes a Bellville spring stack 12.
  • the housing members are threadably connected to each other at 130, 131, 132, 133, 134 and 135.
  • the mandrel of the jar includes an upper portion 160 which is threadedly connected to connector 100, a central portion 21 and a lower portion 153.
  • the mandrel portions are connected together by threads at 136 and 158. Suitable seals are provided at 121, 122, 123, 124, 125, 126, 129 and 139.
  • a floating piston 127 surrounds the lower portion of mandrel 153.
  • a lubricating material is introduced into the housing through fittings 140 and 141.
  • the upper portion of the mandrel 160 includes an annular raised portion 138 which acts as a hammer against an anvil shoulder 137 on housing upper end member 102. As shown in FIG. 10 , upper housing member 103 may comprise a hexagon surface 171 which receives a hexagon outer surface 172 on the mandrel portion 160.
  • the jarring tool of FIG. 9 may incorporate the release lugs shown in the embodiments of FIG. 5 or that of the embodiment of FIGS. 7 and 8 .
  • FIG. 11 illustrates a third embodiment of the release mechanism. It also includes a plurality of individual release lugs 201-204 and those not shown that are spaced apart by a distance 231, 232, 233 along their entire length.
  • Each release lug includes a plurality of external grooves 206 and a plurality of internal ridges 207 that cooperate with a trigger sleeve and mandrel in the same manner as previous embodiments.
  • An inner annular ring 220 is positioned within an interior groove 221 provided in each release lug. Ring 220 acts as a stabilizer for the release lugs.
  • An annular garter spring 228 may be positioned in each of the grooves 210, 211, 208, 209 provided in each release lug in the manner shown in FIG. 6 .
  • the release lugs 201-204 may have the external grooves 206 and/or the internal ridges 207 of differing axial widths, or differing axial spacings.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP19172632.2A 2018-05-07 2019-05-03 Freisetzungslaschen für eine einmachvorrichtung Withdrawn EP3572616A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15/973,247 US10408009B2 (en) 2015-02-13 2018-05-07 Release lugs for a jarring device

Publications (1)

Publication Number Publication Date
EP3572616A1 true EP3572616A1 (de) 2019-11-27

Family

ID=66397173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19172632.2A Withdrawn EP3572616A1 (de) 2018-05-07 2019-05-03 Freisetzungslaschen für eine einmachvorrichtung

Country Status (1)

Country Link
EP (1) EP3572616A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2065135A (en) * 1927-03-22 1936-12-22 William H Maxwell Jarring tool
US3658140A (en) * 1970-10-20 1972-04-25 Schlumberger Technology Corp Mechanical jar
US5022473A (en) 1989-01-23 1991-06-11 Taylor William T Adjustable fishing jar
US6290004B1 (en) 1999-09-02 2001-09-18 Robert W. Evans Hydraulic jar
US20050183889A1 (en) * 2004-02-25 2005-08-25 Brent Marsh Jar for use in a downhole toolstring
US7510008B2 (en) 2007-07-16 2009-03-31 Evans Robert W Method and apparatus for decreasing drag force of trigger mechanism
US20160237771A1 (en) * 2015-02-13 2016-08-18 Robert W. Evans Release Lugs for a Jarring Device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2065135A (en) * 1927-03-22 1936-12-22 William H Maxwell Jarring tool
US3658140A (en) * 1970-10-20 1972-04-25 Schlumberger Technology Corp Mechanical jar
US5022473A (en) 1989-01-23 1991-06-11 Taylor William T Adjustable fishing jar
US6290004B1 (en) 1999-09-02 2001-09-18 Robert W. Evans Hydraulic jar
US20050183889A1 (en) * 2004-02-25 2005-08-25 Brent Marsh Jar for use in a downhole toolstring
US7510008B2 (en) 2007-07-16 2009-03-31 Evans Robert W Method and apparatus for decreasing drag force of trigger mechanism
US20160237771A1 (en) * 2015-02-13 2016-08-18 Robert W. Evans Release Lugs for a Jarring Device

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