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WO2008095233A1 - Repêcheur souterrain non verrouille - Google Patents

Repêcheur souterrain non verrouille Download PDF

Info

Publication number
WO2008095233A1
WO2008095233A1 PCT/AU2008/000126 AU2008000126W WO2008095233A1 WO 2008095233 A1 WO2008095233 A1 WO 2008095233A1 AU 2008000126 W AU2008000126 W AU 2008000126W WO 2008095233 A1 WO2008095233 A1 WO 2008095233A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotator
engage
overshot
drive key
pressure seat
Prior art date
Application number
PCT/AU2008/000126
Other languages
English (en)
Inventor
Leslie Michael Anderson
Original Assignee
Shelljet Pty Limited
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 AU2007900694A external-priority patent/AU2007900694A0/en
Application filed by Shelljet Pty Limited filed Critical Shelljet Pty Limited
Publication of WO2008095233A1 publication Critical patent/WO2008095233A1/fr

Links

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
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot

Definitions

  • This invention relates to an underground unlatch overshot for use in the drilling of upward, horizontal, or flat angled boreholes, predominantly in underground mines.
  • overshots are pumped into location to latch onto the back end of an article such as an inner tube.
  • the overshot and inner tube are retrieved via a wireline rope.
  • an overshot tool for bore hole operations comprising a lower end portion including lifting dogs for engaging an article such as a tube in a bore hole, a swivel shaft adapted to be connected by its upper end to a wireline rope, a pressure seat shaft located between the lower end portion and the swivel shaft, a lower drive key on the lower end portion, an upper drive key on the pressure seat shaft, a lower rotator rotatable and slidable along the lower end portion, the lower rotator having a first array of teeth adapted to engage and be rotated by the lower drive key upon movement of the lower rotator, and an upper rotator having a second array of teeth adapted to engage and be rotated by the upper drive key upon movement of the upper rotator and wherein the lower end of the lower rotator has a slot which when aligned with the lower drive key by the rotation of the lower rotator allows the lower end of the bottom rotator to engage the upper end of the lifting dogs so as to open
  • Fig. 1 is an exploded cross-sectional view of an overshot according to one embodiment of the invention.
  • the overshot 10 shown in the drawings has a locator body 11 at its lower end which carries a pair of latch dogs 12.
  • the locator body 11 has a boss 14 which receives a latch locator 15 that carries a bottom drive key 16 which, in this instance, has three teeth 17 adapted to engage the teeth 18 at the lower end of the lower rotator 19.
  • a key connecting shaft 20 passes through the lower rotator 19 and is screwed into the upper end of the stem 21 of the locator body 11.
  • a large spring 22 is located within the upper end of the lower locator 19 and seats on shoulder 23.
  • the key connecting shaft 20 has a shoulder 24 against which seats small spring 25 that is located on the stem 26 of the key connecting shaft 20.
  • the upper end of the stem 26 is threaded into the lower end of the pressure seat shaft 27.
  • a centre drive key 28 mounted on the lower end of the pressure seat shaft 27 has teeth 29 adapted to engage the teeth 30 on the lower end of the upper rotator 31.
  • the invention provides an overshot tool 10 for bore hole operations has a swivel shaft 42 at its upper end for connecting the overshot 10 to a wireline rope, a locator body 11 at its lower end which has a pair of lifting dogs 12 for engaging an article in the bore hole, a pressure seat shaft 27 between the locator body 11 and the swivel shaft 42, a lower rotator 19 slidable and rotatabie with respect to the locator body 11 having a slot 19a, an upper rotator 31 movable with the lower rotator 19 which has teeth 18 which engage a lower drive key 16 on the locator body 11.
  • the underground unlatch overshot of the invention has been designed to allow the drill rig operator to unlatch the overshot from an inner tube should the inner tube become stuck.
  • the operator can drill another inch or so to try and free up the inner tube, or in the worst case, pull the rods without having to cut the wire line.
  • the up and down movement of the overshot is translated into rotational movement whereby the lower rotator 19 is rotated so that the slot 19a can slide over the lower drive key 16 putting pressure on the top of the lifting dogs 12 to unlatch the overshot 10 from the tube.
  • the pump down features of the overshot are maintained and the adjustments and other action of the overshot all remain as before.
  • the major change is the ability to unlatch at will by dialling up the number of strokes chosen to unlatch the unit. This is done by selecting the number of strokes desired after cocking the unit as per usual.
  • the number of strokes is translated into the number of teeth 18 around the lower end of the lower rotator 19.

Landscapes

  • 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)

Abstract

L'invention crée un outil repêcheur (10) pour des opérations sur trou de forage qui comporte un arbre de pivot (42) au niveau de son extrémité supérieure servant à relier le repêcheur (10) à un câble, un corps de positionneur (11) situé au niveau de son extrémité inférieure qui comporte une paire de cames de levage (12) servant à introduire un élément dans le trou de forage, un arbre de siège de pression (27) situé entre le corps de positionneur (11) et l'arbre de pivot (42), une bague tournante inférieure (19) pouvant glisser et tourner par rapport au corps de positionneur (11), comportant une fente (19a), une bague tournante supérieure (31) pouvant se déplacer avec la bague tournante inférieure (19) qui comporte des dents (18) qui sont en prise avec une clavette d'entraînement inférieure (16) sur le corps de positionneur (11). La bague tournante supérieure (31) comporte des dents (30) qui sont en prise avec une clavette d'entraînement supérieure (28) sur l'arbre de siège de pression (27). La bague tournante inférieure (19) et la bague tournante supérieure (31) sont entraînées en rotation par les clavettes d'entraînement (16) et (28) lors du mouvement vers le haut et vers le bas des bagues tournantes (19) et (31) jusqu'à ce que la fente (19a) soit alignée avec la clavette d'entraînement inférieure (16) ce qui permet à l'extrémité inférieure de la bague tournante inférieure de se mettre en prise avec l'extrémité supérieure des cames de levage afin d'ouvrir l'extrémité inférieure des cames de levage et, ainsi, de libérer l'élément.
PCT/AU2008/000126 2007-02-05 2008-02-04 Repêcheur souterrain non verrouille WO2008095233A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007900694A AU2007900694A0 (en) 2007-02-05 Underground unlatch overshot
AU2007900694 2007-02-05

Publications (1)

Publication Number Publication Date
WO2008095233A1 true WO2008095233A1 (fr) 2008-08-14

Family

ID=39681174

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000126 WO2008095233A1 (fr) 2007-02-05 2008-02-04 Repêcheur souterrain non verrouille

Country Status (1)

Country Link
WO (1) WO2008095233A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012119186A1 (fr) * 2011-03-04 2012-09-13 2Ic Australia Pty Ltd Cloche de repêchage
US9488022B2 (en) 2011-03-31 2016-11-08 Groupe Fordia Inc. Overshot
CN110821434A (zh) * 2019-11-11 2020-02-21 中国石油集团川庆钻探工程有限公司工程技术研究院 一种自紧卡爪、可退式变径打捞工具及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393002A (en) * 1965-03-23 1968-07-16 Brown J. Woolley Overshot retrieving tool
US4232894A (en) * 1979-08-02 1980-11-11 Taylor William T Selectively releasable overshot and pull tool
US6564885B2 (en) * 2001-04-27 2003-05-20 Boart Longyear International Holdings, Inc. Up-hole overshot and safety drilling apparatus
GB2402955A (en) * 2003-06-20 2004-12-22 Weatherford Lamb Hydraulically released overshot tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393002A (en) * 1965-03-23 1968-07-16 Brown J. Woolley Overshot retrieving tool
US4232894A (en) * 1979-08-02 1980-11-11 Taylor William T Selectively releasable overshot and pull tool
US6564885B2 (en) * 2001-04-27 2003-05-20 Boart Longyear International Holdings, Inc. Up-hole overshot and safety drilling apparatus
GB2402955A (en) * 2003-06-20 2004-12-22 Weatherford Lamb Hydraulically released overshot tool

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012119186A1 (fr) * 2011-03-04 2012-09-13 2Ic Australia Pty Ltd Cloche de repêchage
AU2012225191B2 (en) * 2011-03-04 2017-04-20 Reflex Instruments Asia Pacific Pty Ltd Overshot
AU2012225191C1 (en) * 2011-03-04 2018-03-01 Reflex Instruments Asia Pacific Pty Ltd Overshot
US9488022B2 (en) 2011-03-31 2016-11-08 Groupe Fordia Inc. Overshot
CN110821434A (zh) * 2019-11-11 2020-02-21 中国石油集团川庆钻探工程有限公司工程技术研究院 一种自紧卡爪、可退式变径打捞工具及方法
CN110821434B (zh) * 2019-11-11 2023-08-18 中国石油天然气集团有限公司 一种自紧卡爪、可退式变径打捞工具及方法

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