EP4172455A1 - Dégagement de fil - Google Patents

Dégagement de fil

Info

Publication number
EP4172455A1
EP4172455A1 EP21737073.3A EP21737073A EP4172455A1 EP 4172455 A1 EP4172455 A1 EP 4172455A1 EP 21737073 A EP21737073 A EP 21737073A EP 4172455 A1 EP4172455 A1 EP 4172455A1
Authority
EP
European Patent Office
Prior art keywords
thread
female portion
length
mounting sleeve
female
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.)
Pending
Application number
EP21737073.3A
Other languages
German (de)
English (en)
Inventor
John Hammargren
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.)
Sandvik Mining and Construction Tools AB
Original Assignee
Sandvik Mining and Construction Tools AB
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
Application filed by Sandvik Mining and Construction Tools AB filed Critical Sandvik Mining and Construction Tools AB
Publication of EP4172455A1 publication Critical patent/EP4172455A1/fr
Pending legal-status Critical Current

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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded

Definitions

  • the present invention relates to a female portion to form part of a thread joint for a percussive drilling tool, especially for, although not exclusively for drill bits and drill rods.
  • Percussion drilling is used to create a long borehole via a plurality of elongate drill string rods coupled together end-to-end by interconnected male and female threads.
  • a drill bit may be connected to a single rod.
  • the well-established technique breaks rock by hammering impacts transferred from the rock drill bit to the rock at the bottom of the borehole.
  • the rock drill bit is mounted at one end of the drill string via a male thread on the endmost drill string rod to a female thread on the drill bit.
  • the energy required to break the rock is generated by a hydraulically driven piston that contacts the end of the drill string (via a shank adaptor) to create a stress (or shock) wave that propagates through the drill string to a drill bit.
  • Conventional threaded joints are described in US 4,332,502; US 4,398,756; US 4,687,368 and DE 2800887.
  • Threaded joints in the percussive drilling tool such as those between drill string rods and between the endmost drill string rod and the drill bit are subjected to bending forces during drilling from the stress waves that propagate the drill string. These bending moments fatigue the threaded joints and lead to breakage within the threaded portion of the joint. Eventually the stress will cause the threaded joint to get worn out and eventually fail.
  • a female portion to form part of a thread joint for a percussive drilling tool comprising: a mounting sleeve having an axial end, wherein the mounting sleeve surrounds an internal cavity having an axial inner wall at the opposing end of the mounting sleeve compared to the axial end; wherein the mounting sleeve has at least one substantially cylindrical internally threaded section having a length Li, a thread entrance towards the axial end and a thread exit towards the axial inner wall; a thread clearance section positioned between the axial inner wall and the thread exit having a length L and a diameter Di; a guiding section positioned between the thread entrance and the axial end of the sleeve having a length, L 3 ; characterized in that: 0 mm ⁇ L 3 -L 2 ⁇ 12 mm. More preferably, 5 mm ⁇ L
  • this reduces the stress in the female portion of the threaded joint, meaning the risk of breakages in the female portion is decreased. Furthermore, if the stress in the female portion is increased then the diameter of the male threaded part can be increased which improves the performance of the percussive drilling tool.
  • Li is between 25-56 mm, more preferably between 30-45 mm.
  • the total length of the female thread (LI + L2 + L3) is between 70 to 86 mm.
  • this is the most optimal length of threaded section for increased performance.
  • L /L > O.Olx Di.
  • by increasing the ratio of the length of the thread clearance area compared to the length of the threaded section means that the stress in thread clearance area decreases.
  • L / Li > 26%, more preferably L / Li > 32%.
  • increasing the ratio of the length of the thread clearance area compared to the length of the threaded section means that the stress in thread clearance area decreases.
  • L / Li ⁇ 65%, more preferably ⁇ 50%.
  • this provides sufficient length in the threaded section to achieve a secure threaded connection.
  • L / Di > 30%, more preferably Li/ Di > 38%.
  • increasing the ratio of the length of the thread clearance area compared to the diameter of the threaded section means that the stress in thread clearance area decreases. Therefore, the diameter of the thread clearance and female thread can be increased and consequently so can the diameter of the male part, which leads to increased performance of the male part and less risk of skirt failures in the female part.
  • this enables a secure threaded connection.
  • the female portion is a drill bit. In an alternative embodiment, the female portion is a female end of a drill string rod.
  • Figure 1 Perspective view of a percussive drilling tool having one male and one female end.
  • Figure 2 Perspective view of a drill rod having two male ends.
  • Figure 3 Cross section of the female end of a drill rod.
  • Figure 4 Cross section of a drill bit.
  • Figure 5 Cross section of an internal profile of the cavity of the female portion to form part of a thread joint for a percussive drilling tool.
  • FIG 1 shows a percussive drilling tool 2 whereby a drill rod 4 is threadedly coupled to a drill bit 6 of conventional design.
  • the percussive drilling tool 2 is especially used for top hammer drilling. Shockwaves generated by a surface piston (not shown) are translated through the mated surfaces from the drill rod 4 to the drill bit 6.
  • the drill rod 4 comprises an axially extending main length section 8 that is terminated at one end by a male end 10 and at a second opposite end by a female end 12 having a longitudinal axis 14.
  • the drill rod 4 is capable of being coupled end-to-end with other further drill rods to form a drill string (not shown) via another thread joint.
  • Figure 2 shows that alternatively the drill bit 6 may be connected to a single drill rod 4 having two male ends 10.
  • Figure 3 shows a cross section of the female end 12 of the drill rod 4 having a mounting sleeve 18 and an internal cavity 20, which is a hollow space, for receiving the male end 10 of the drill rod.
  • Figure 4 shows a cross section of the drill bit 6 comprising an axially forwardmost drill head 16 of convention design for example comprising a rock crushing means, most typically this is a plurality of wear resistant cutting buttons projecting axially forward from the drill head (not shown); a mounting sleeve 18 that comprises an axially extending internal cavity 20 for receiving the male end 10 of the drill rod 4.
  • the present invention relates to a special design for a female portion 22 that forms part of a thread joint for a percussive drilling tool 2.
  • the female portion 22 could be either the female end 12 on the drill rod 4 or the drill bit 6.
  • Figure 5 shows a cross section of an internal profile of the cavity 20 of the female portion 22, in other words figure 5 is an enlargement of the interior of figure 3 or figure 4.
  • the cavity 20 has an axial inner wall 24 for abutment with a male end 10 of a drill rod 4.
  • the cavity 20 has at least one substantially cylindrical internally threaded section 26 having a thread entrance 28 at the axially opposite end compared to the axial inner wall 24 and a thread exit 30 nearer to the axial inner wall 24.
  • the threaded section 26 has a length, Li, which is defined as the length between the thread entrance 28 and the thread exit 30.
  • the cavity 20 of the female portion 22 also has a thread clearance section 32 positioned between the axial inner wall 24 and the threaded section 26.
  • the thread clearance section 32 is circumferential concave recess.
  • the thread clearance section 32 has a length, 1- 2 , which is defined as the length between the thread exit 30 and the axial inner wall 24.
  • the thread clearance section has a diameter, Di.
  • the guiding section 50 has a length, L 3 , which is defined as the length between the thread entrance 28 and an axial end 52 of the sleeve 18.
  • the guiding section 50 can either be a constant diameter across the whole of the guiding section 50 or it could optionally be stepped so that it has at least two different diameters.
  • L 3 - L 2 for female portions 22 according to the present invention is ⁇ 12 mm, more preferably ⁇ 11.5 mm, even more preferably ⁇ 11 mm.
  • L 3 - L 2 for female portions 22 according to the present invention is >0 mm, more preferably >5 mm, even more preferably >7 mm.
  • Li is between 25-56 mm, more preferably between 30-45 mm.
  • L2/Ll >0.01x Di.
  • L 2 / U > 26%, more preferably >32%.
  • L 2 / U ⁇ 65%, more preferably ⁇ 50%.
  • L 2 / Di > 30%, more preferably >38%.
  • the female portion 22 is used for forming a thread joint 34 for a percussive drilling tool 2 wherein there is a bottom contact, as opposed to a shoulder contact, between female portion 22 and the male end 10 of the adjoining rod. In other words, there is contact between the axial inner wall 24 on the female portion and the male end 10 of the adjoining rod 4.
  • Software simulation programming with bending force added to the female portion 22 of inventive and non-inventive female portions was performed. Table 1 shows a summary of stress measurements for prior art and inventive female portions 22, it can clearly be seen that the stress in the region of the thread clearance is lower for the inventive samples. Table 1: Summary of stress measurements

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Dowels (AREA)
  • Materials For Medical Uses (AREA)

Abstract

La présente invention porte sur une partie femelle pour former une partie d'un raccord fileté pour un outil de forage à percussion comprenant un manchon de montage ayant une extrémité axiale, le manchon de montage entourant une cavité interne ayant une paroi interne axiale au niveau de l'extrémité opposée du manchon de montage par rapport à l'extrémité axiale ; le manchon de montage ayant au moins une section filetée à l'intérieur sensiblement cylindrique ayant une longueur L1, une entrée de fil vers l'extrémité axiale et une sortie de fil vers la paroi interne axiale ; une section de dégagement de fil positionnée entre la paroi interne axiale et la sortie de fil ayant une longueur L2 et un diamètre D1 ; une section de guidage positionnée entre l'entrée de fil et l'extrémité axiale du manchon ayant une longueur L3 ; caractérisée en ce que : 0 mm < L3 - L2 < 12 mm.
EP21737073.3A 2020-06-30 2021-06-29 Dégagement de fil Pending EP4172455A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20183128.6A EP3933165A1 (fr) 2020-06-30 2020-06-30 Dégagement de filetage
PCT/EP2021/067808 WO2022002911A1 (fr) 2020-06-30 2021-06-29 Dégagement de fil

Publications (1)

Publication Number Publication Date
EP4172455A1 true EP4172455A1 (fr) 2023-05-03

Family

ID=71409170

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20183128.6A Withdrawn EP3933165A1 (fr) 2020-06-30 2020-06-30 Dégagement de filetage
EP21737073.3A Pending EP4172455A1 (fr) 2020-06-30 2021-06-29 Dégagement de fil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20183128.6A Withdrawn EP3933165A1 (fr) 2020-06-30 2020-06-30 Dégagement de filetage

Country Status (12)

Country Link
US (1) US20230272678A1 (fr)
EP (2) EP3933165A1 (fr)
JP (1) JP2023531271A (fr)
KR (1) KR20230028299A (fr)
CN (1) CN115698463A (fr)
AU (1) AU2021298830A1 (fr)
BR (1) BR112022026893A2 (fr)
CA (1) CA3179275A1 (fr)
CL (1) CL2022003779A1 (fr)
MX (1) MX2022016467A (fr)
PE (1) PE20230563A1 (fr)
WO (1) WO2022002911A1 (fr)

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537738A (en) * 1968-04-15 1970-11-03 Sandvikens Jernverks Ab Drill rod for long hole drilling in the ground
US4332502A (en) 1977-01-11 1982-06-01 Padley & Venables Limited Apparatus for use in drilling
US4398756A (en) 1980-09-15 1983-08-16 Vallourec, S. A. Cylindro-conical pipe joint
SE459681B (sv) * 1985-01-07 1989-07-24 Santrade Ltd Borrelement foer slagborrning
SE469602B (sv) 1985-04-04 1993-08-02 Sandvik Ab Skarvgaenga foer slagborrning
SE469603B (sv) * 1988-07-08 1993-08-02 Sandvik Ab Gaengfoerband
SE505073C2 (sv) * 1994-07-19 1997-06-23 Sandvik Ab Gängförband för slående borrning
SE516651C2 (sv) * 1999-11-26 2002-02-05 Sandvik Ab Gängförband för slående borrning, en handel och en hondel
SE522221C2 (sv) * 2001-10-12 2004-01-27 Sandvik Ab Gängförband för slående bergborrning
SE0201989L (sv) * 2002-06-27 2003-05-20 Sandvik Ab Handel, borrkrona och gängförband för slående bergborrning
US7210710B2 (en) * 2004-03-01 2007-05-01 Omsco, Inc. Drill stem connection
JP4954542B2 (ja) * 2005-12-09 2012-06-20 三菱マテリアル株式会社 掘削ロッド、掘削ビット及び掘削工具
SE531459C2 (sv) * 2006-05-17 2009-04-14 Sandvik Intellectual Property Hondel samt förfarande för tillverkning av hondelar
US9885214B2 (en) * 2009-07-14 2018-02-06 Ptech Drilling Tubulars, Llc Threaded tool joint connection
EP2383420B1 (fr) * 2010-04-29 2012-06-20 Sandvik Intellectual Property AB Trépan pour perçage de roche à percussion
US9239122B2 (en) * 2012-05-22 2016-01-19 Single Buoy Moorings, Inc. Pipe connection
US9643262B2 (en) * 2013-07-25 2017-05-09 Kennametal Inc. Coupling mechanism for cutting tool
EP3095954B1 (fr) * 2015-05-22 2024-05-15 Sandvik Intellectual Property AB Tige de forage ou adaptateur de couplage avec un embout renforcé
EP3095955A1 (fr) * 2015-05-22 2016-11-23 Sandvik Intellectual Property AB Extrémité de couplage filetée pour composant de train de tiges
US10612701B2 (en) * 2017-03-13 2020-04-07 Rotary Connections International Ltd. Premium threaded connection and method for making same

Also Published As

Publication number Publication date
US20230272678A1 (en) 2023-08-31
BR112022026893A2 (pt) 2023-01-24
CN115698463A (zh) 2023-02-03
WO2022002911A1 (fr) 2022-01-06
MX2022016467A (es) 2023-02-01
KR20230028299A (ko) 2023-02-28
JP2023531271A (ja) 2023-07-21
CA3179275A1 (fr) 2022-01-06
CL2022003779A1 (es) 2023-05-19
PE20230563A1 (es) 2023-04-04
EP3933165A1 (fr) 2022-01-05
AU2021298830A1 (en) 2023-02-02

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