WO2006128235A1 - Ensemble tete de harpon - Google Patents

Ensemble tete de harpon Download PDF

Info

Publication number
WO2006128235A1
WO2006128235A1 PCT/AU2006/000736 AU2006000736W WO2006128235A1 WO 2006128235 A1 WO2006128235 A1 WO 2006128235A1 AU 2006000736 W AU2006000736 W AU 2006000736W WO 2006128235 A1 WO2006128235 A1 WO 2006128235A1
Authority
WO
WIPO (PCT)
Prior art keywords
spear point
guard
spear
opening
point according
Prior art date
Application number
PCT/AU2006/000736
Other languages
English (en)
Inventor
Gavin Mcleod
Andrew Beach
Original Assignee
2Ic Australia Pty Ltd
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 AU2005902783A external-priority patent/AU2005902783A0/en
Application filed by 2Ic Australia Pty Ltd filed Critical 2Ic Australia Pty Ltd
Priority to CA002627582A priority Critical patent/CA2627582A1/fr
Priority to US11/921,337 priority patent/US20090206620A1/en
Priority to EP06741153A priority patent/EP1885991A1/fr
Priority to AU2006254722A priority patent/AU2006254722A1/en
Publication of WO2006128235A1 publication Critical patent/WO2006128235A1/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
    • E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears

Definitions

  • the present invention relates to a spearhead assembly of the type used in mining and subsurface drilling to enable the coupling of down hole equipment to a wire line to facilitate the tripping of the equipment down a drill hole, drill string or casing.
  • the present Applicant is the applicant in relation to International publication WO 2004/018831 in relation to a spearhead assembly.
  • the spearhead assembly in the aforementioned International publication comprises a base provided with a slot at one end that opens onto an outer surface of the base. The outer surface is composed of three contiguous surface portions. A proximal end of the spear point is located in the slot and pivotally coupled to the base . An opposite distal end of the spear point extends or projects beyond the slot.
  • the spearhead assembly further comprises a spear point positioning system that urges the spear point toward one of a plurality of angularly spaced positions. These positions are characterized by the spear point extending substantially perpendicular to adjacent edges of the slot. This spear point positioning system holds the spear point in one of the positions until application of a positive external force.
  • a spearhead assembly comprising: a base having an outer surface; a slot formed in the base and having an opening that opens onto the outer surface; a spear point having a proximal end located in the slot and pivotally coupled about a pivot axis to the base to enable pivotal motion of the spear point between two angularly spaced positions; and, a guard coupled to the proximal end of the spear point, the guard configured to at least partially occupy the opening when the spear point is in at least one location at or between the two positions, or a range of locations at or between the two positions.
  • the guard has a side portion of which lies across the opening when the guard is in the at least one or range of locations .
  • the portion of the side may lie substantially flush with the opening.
  • the portion of the side may lie proud of the opening, for example to form a substantially continuous curve with the outer surface.
  • the side may comprise different portions which lie substantially flush with the opening and proud of the opening respectively when the guard is in different locations between the two positions. That is the side of the guard may take different shapes and configurations. In its simplest form when the guard is in the general configuration of a disc the side would comprise a simple curved surface having a linear transverse section. However in an alternative embodiment the side or portion of the side may be of a complex configuration and have for example a stepped, wave or zigzag transverse section.
  • the side comprises a plurality of radially and/or axially extending and spaced apart ribs or webs.
  • the spacing between the ribs or webs forms one or more channels or grooves in the radially outermost surface .
  • the guard may comprise a central recess for seating the proximal end of the spear point.
  • the spearhead assembly may further comprise an attachment mechanism for attaching the guard to the spear point.
  • the attachment mechanism comprises a snap coupling between the guard and the proximal end of the spear point. This can be facilitated by the provision of a hole or cavity in the guard and a knob or barb-like projection at the proximal end of the spear point that is pushed into or through the hole or cavity.
  • the base comprises two spaced apart walls between which the slot is defined and the opening is formed; and, two barriers, one of each extending into the opening on opposite sides of the slot between the spaced apart walls.
  • the barriers may be in the form of lips.
  • one or more passages are formed in the barrier and/or between the barrier and the walls.
  • the spearhead assembly may further comprise a fluid channel extending through the base and in communication with the slot to allow a fluid flow through the spearhead assembly.
  • the spearhead assembly may further comprise a spear point positioning system that urges the spear point toward, or holds the spear point in, one of a plurality of angularly spaced positions.
  • the spear point positioning system may comprise a plate through which the spear point extends, the plate being retained on the spear point at a location where the plate contacts the outer surface of the base .
  • the spear point positioning system further comprise a biasing mechanism that urges the spear point into one of the plurality of set positions and holds the spear point in one of the plurality of set positions .
  • the biasing mechanism acts to bias the plate against the outer surface of the base .
  • the opening of the slot comprises a plurality of contiguous lengths where mutually adjacent lengths lie in respective non-parallel planes, and wherein the plurality of set positions are positions where the spear point extends perpendicular to the plane of the length of the opening from which the spear point extends .
  • the guard itself may be configured to act as a type of spear point positioning system.
  • the side of the guard comprises at least two oppositely disposed straight length the straight lengths being arranged to extend parallel to the spear point and wherein a transverse distance between the straight lengths is slightly smaller than an inner diameter of the drill pipe or other conduit through which the spear point assembly travels. It will be appreciated that by dimensioning the straight lengths in this way, when the spear point assembly is initially entering a drill pipe or other conduit, and the spear point is pivoted more than say a few degrees away from the longitudinal axis of the assembly, contact of one of the straight edges with the opening of the drill pipe or conduit will cause pivoting of the guard and spear point so as to lie substantially parallel to the longitudinal axis.
  • Figure 1 is a representation of an embodiment of the spearhead assembly in accordance with the present invention.
  • Figure 2 is an enlarged view of the portion of the spearhead assembly with the spear point inclined from a longitudinal axis of the spearhead assembly;
  • Figure 3 is an enlarged view of the spearhead assembly with the spear point extending perpendicular to the longitudinal axis of the spearhead assembly;
  • Figure 4 is an isometric view from the front of a guard incorporated in the spearhead assembly;
  • Figure 5 is an isometric view from the top of the guard shown in Figure 4;
  • Figure 6 is an isometric view from a lower edge of the guard
  • Figure 7 is an isometric view of the base incorporated in the spearhead assembly.
  • Figure 8 is a view of section AA of the base depicted in Figure 7.
  • an embodiment of the spearhead assembly 10 in accordance with the present invention comprises a base 12 having an outer surface 14, a slot 16 (see in particular Figure 7) , a spear point 18 (shown in Figures 1-3) and a guard 20 (shown in Figures 1- 6) .
  • the slot 16 is formed in the base 12 and has an opening 22 that opens onto the outer surface 14.
  • the spear point 18 has a proximal end located in the slot 16 and pivotally coupled about a pivot axis 26 to the base 12 to enable pivotal motion of the spear point 18.
  • the spear point 18 can pivot about the axis 26 between two angularly spaced positions.
  • the guard 20 is coupled to the proximal end of the spear point 18 and configured to at least partially occupy the opening 22 when the spear point is in a location at or 5 between the aforementioned two spaced apart positions . Consequently, the guard acts to minimise the risk of an operator's hand or glove worn by the operator from being pinched or caught in the slot 16 between the spear point 18 and the base 12 as the spear point 18 is pivoted 0 between the two positions.
  • embodiments of the spear head assembly 10 and in particular guard 20 assist in reducing the likelihood of injury or accident during raising and lowering of a device to which the assembly 10 is attached, as well as during the coupling and decoupling 5 of the spear point assembly with an overshot.
  • the base 12 comprises a pair of spaced apart walls 30 and 32 between which the slot 16 is defined, and the opening 22 is 0 formed.
  • the walls 30 and 32 project from one end of a spigot or a tube 34.
  • the walls 30 and 32 each have a generally semi-cylindrical outer surface which constitutes a major portion of the outer surface 14 of the base 12; and respective inner planar walls 31 and 33.
  • An axial 5 channel 36 is formed in the tube 34 that communicates with the slot 16.
  • a concavely curved wall 38 is provided in the base 12 between the walls 30 and 32, and onto which the channel 36 opens.
  • Holes 40 and 42 are formed in the walls 30 and 32 respectively co-axial with the pivot axis 0 26. These holes receive a pivot pin 44 that also extends through the proximal end of the spear point 18 and the guard 20, coupling the spear point 18 to the base 12.
  • the opening 22 of the slot 16 can be considered as 5 comprising a plurality of contiguous lengths which are shown most conveniently in Figure 8 as lengths 46, 48, 50, 52 and 54. These lengths correspond with edges formed between the outer peripheral surfaces of the walls 30 and 32 and their corresponding inner planar surfaces 31 and 33.
  • the lengths 46-54 trace a path in the shape of an inverted U. It will be further observed that a plane containing the length 46 is inclined (ie not parallel) to a plane containing a length 48, which in turn is not parallel to a plane containing a length 50, which in turn is not parallel to a plane containing a length 52, which lies in a plane not parallel to a plane containing a length 54.
  • Barriers in the form of upstanding lips 56 and 58 project into the opening 22 between the walls 30 and 32. More particularly, the lip 56 projects into the length 46 of the opening, while the lip 58 projects into the length 54 of the opening.
  • the lips 56 and 58 have respective surfaces interior of the slot 16 that follow the curvature of the concave wall 38. In this embodiment, the lips 56 and 58 extend upwardly only a relatively short distance and terminate at a level short of the holes 40 and 42.
  • the lips 56 and 58 act to limit the pivotal motion of the spear point 18 as well as further assist in the prevention of pinching of an operators hand or glove.
  • Passages 60 are formed between opposite lateral edges of each of the lips 56 and 58 and the adjacent walls 30 and 32.
  • the guard 20 comprises a body 62 having opposite planar surfaces 64 and 66 that face the inner planar walls 31 and 33 respectively, and a generally arcuate radially outer surface, or side 68 between the surfaces 64 and 66.
  • a central recess or seat 70 is formed in the body 62 for receiving the proximal end of the spear point 18.
  • a hole 72 is formed through the body 62 at the bottom of the recess 70.
  • the radial outer surface or side 68 can be considered as comprising three parallel radially extending ribs or webs 74 and an axialIy extending rib 76. The webs 74 and 76 lie in the vicinity of the opening 22 irrespective of the pivotal position of the spear point 18.
  • the webs 74,76 may lie inside or outside of the actual opening 22. Their actual position relative to the opening is not per se critical to the working of the invention.
  • the function performed by the webs 74,76 and moreover the guard 20 as a whole is to substantially occupy the opening 22 to prevent pinching of an operators hand or glove .
  • Channels or grooves 78 are formed between the webs 74,76, which provide flow paths that communicate with the passage 60 and channel 36 so that drilling fluids or naturally occurring fluids within a drill hole are able to flow through the spearhead assembly 10.
  • an attachment mechanism is effectively formed to enable the easy coupling of the guard 20 to the spear point 18.
  • the illustrated embodiment of the spearhead assembly 10 includes a spear point positioning system 80 of a type described in International publication No. WO 2004/018831, the contents of which is incorporated herein by way of reference. Nevertheless, by way of brief explanation, the spear point positioning system 80 operates to urge the spear point 18 toward, and/or hold the spear point 18 in, one of a plurality of angularly spaced positions. These positions are characterised by the spear point 18 extending perpendicular to particular lengths 46-54 of the opening 22 from which it extends. For example, with reference to Figure 1, the spear point position system operates to hold the spear point 18 in a position where it extends perpendicular to the length 50 of the opening 22.
  • the positioning system 80 holds the spear point 18 at a position perpendicular to a plane containing the length 48 of the opening 22, and in Figure 3 the positioning system holds the spear point 18 to extend perpendicular to a plan containing the length 46 of the opening 22.
  • the positioning system 80 comprises a plate in the form of a washer 82 retained on the spear point 18, and a helical spring 84 also retained on the spear point 18 and acting to bias the washer 82 against the outer surface 14 and more particularly, the lengths 46-54 of the opening 22.
  • the positioning system 80 operates to provide a snap action when the spear point 18 is pivoted between the lengths 46-54 of the opening 22. More particularly, the system 80 acts to bias or snap the spear point 18 to lie perpendicular to the angularly closest length. For example, consider the spear point 18 being moved from a position shown in Figure 1 where it extends perpendicular to the length 50, to the position shown in Figure 2 where it extends perpendicular to the length 48. As the spear point 18 is being pivoted about the axis 26, the system 80 will urge the spear point toward the perpendicular of length 50 until it passes beyond the midway point to the perpendicular to the length 48.
  • the system 18 would act to snap the spear point 18 back to the position shown in Figure 1. However once the spear point 18 is rotated past the midway point, the system 80 acts to snap the spear point to a position perpendicular to the length 48.
  • the base 12 is described and illustrated as including an axial passage 36.
  • the passage 36 is not required.
  • the channels 78 in the outer radial surface of the guard 20 are not necessary.
  • the configuration of the guard 20 is almost limitless.
  • it may be modified by the inclusion of further axial ribs parallel to the axial rib 76 so that the outer surface 68 takes a mesh like appearance.
  • a steel mesh or grid may be placed in the channels or grooves 78.
  • the entire guard 20 may be in the form of a wire mesh structure that is coupled to the proximal end of the spear point 18.
  • the spear point 18 and the guard 20 could be moulded or otherwise constructed as a single piece.
  • the outer most ribs or webs 74 comprise respective straight edges or sides 79.
  • the positioning system 80 particularly insofaras it operates to maintain the spear point 18 in general alignment with the axis 28, and longitudinal axis of the drill pipe.
  • the spear point 18 will be maintained within a narrow arc from the axis 28 when inside a drill pipe due to contact of the lengths 19 with the inner diameter of the drill pipe upon pivoting of the guard 20 and the spear point 18 more than only several degrees away from alignment with the axis 28.

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

Ensemble tête de harpon (10) avec base (12) à surface externe (14), fente (16), point de tête de harpon (18) et garde (20). La fente (16) se trouve dans la base (12) et présente une ouverture (22) qui donne sur la surface externe (14). Une extrémité proximale du point de tête de harpon (18) se trouve dans la fente (16) et est couplée pivotante autour d'un axe de pivotement (26) à la base (12). Ledit point (18) peut pivoter autour d'un axe (26) entre les deux positions qui ont un espacement angulaire de 180°. La garde (20) est couplée à l'extrémité proximale du point (18) avec une configuration permettant d'occuper au moins partiellement l'ouverture (22) lorsque ce point est dans un emplacement aux deux positions espacées ou entre elles. La garde (20) permet de minimiser le risque de pincement ou d'immobilisation de la main ou du gant d'un opérateur dans la fente (16) entre le point en question (18) et la base (12) lorsque ce point (18) pivote enter les deux positions.
PCT/AU2006/000736 2005-05-31 2006-05-31 Ensemble tete de harpon WO2006128235A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002627582A CA2627582A1 (fr) 2005-05-31 2006-05-31 Ensemble tete de harpon
US11/921,337 US20090206620A1 (en) 2005-05-31 2006-05-31 Spearhead assembly
EP06741153A EP1885991A1 (fr) 2005-05-31 2006-05-31 Ensemble tete de harpon
AU2006254722A AU2006254722A1 (en) 2005-05-31 2006-05-31 Spearhead assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005902783A AU2005902783A0 (en) 2005-05-31 Spearhead assembly
AU2005902783 2005-05-31

Publications (1)

Publication Number Publication Date
WO2006128235A1 true WO2006128235A1 (fr) 2006-12-07

Family

ID=37481141

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2006/000736 WO2006128235A1 (fr) 2005-05-31 2006-05-31 Ensemble tete de harpon

Country Status (5)

Country Link
US (1) US20090206620A1 (fr)
EP (1) EP1885991A1 (fr)
CA (1) CA2627582A1 (fr)
WO (1) WO2006128235A1 (fr)
ZA (1) ZA200710214B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009140597A3 (fr) * 2008-05-16 2010-03-04 Longyear Tm, Inc. Ensemble harpon articulé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6045171A (en) * 1995-11-10 2000-04-04 Dht Technologies Ltd. Spear head assembly
WO2004018831A1 (fr) * 2002-08-21 2004-03-04 2Ic Australia Pty Ltd Ensemble harpon

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6045171A (en) * 1995-11-10 2000-04-04 Dht Technologies Ltd. Spear head assembly
WO2004018831A1 (fr) * 2002-08-21 2004-03-04 2Ic Australia Pty Ltd Ensemble harpon

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009140597A3 (fr) * 2008-05-16 2010-03-04 Longyear Tm, Inc. Ensemble harpon articulé
CN101999031A (zh) * 2008-05-16 2011-03-30 长年Tm公司 连接式矛头总成
US7921926B2 (en) 2008-05-16 2011-04-12 Longyear Tm, Inc. Jointed spearhead assembly
AU2009246140B2 (en) * 2008-05-16 2012-02-02 Longyear Tm, Inc. Jointed spearhead assembly
EP2274500A4 (fr) * 2008-05-16 2017-07-19 Longyear TM, Inc. Ensemble harpon articule

Also Published As

Publication number Publication date
CA2627582A1 (fr) 2006-12-07
US20090206620A1 (en) 2009-08-20
ZA200710214B (en) 2008-11-26
EP1885991A1 (fr) 2008-02-13

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