WO1996016246A1 - Thread coupling for drill string elements for percussive drilling - Google Patents

Thread coupling for drill string elements for percussive drilling Download PDF

Info

Publication number
WO1996016246A1
WO1996016246A1 PCT/SE1995/001381 SE9501381W WO9616246A1 WO 1996016246 A1 WO1996016246 A1 WO 1996016246A1 SE 9501381 W SE9501381 W SE 9501381W WO 9616246 A1 WO9616246 A1 WO 9616246A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill string
contact surface
thread coupling
wear resistant
thread
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.)
Ceased
Application number
PCT/SE1995/001381
Other languages
French (fr)
Inventor
Leif Nordfeldt
Karl-Axel STJERNSTRÖM
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.)
Uniroc AB
Original Assignee
Uniroc 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 Uniroc AB filed Critical Uniroc AB
Priority to AU39972/95A priority Critical patent/AU688998B2/en
Priority to DE69515686T priority patent/DE69515686T2/en
Priority to US08/849,322 priority patent/US5785360A/en
Priority to CA002205902A priority patent/CA2205902C/en
Priority to EP95938689A priority patent/EP0793764B1/en
Priority to AT95938689T priority patent/ATE190694T1/en
Publication of WO1996016246A1 publication Critical patent/WO1996016246A1/en
Priority to FI972183A priority patent/FI107825B/en
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the present invention relates to a thread coupling for drill string elements for percussive drilling.
  • the present invention aims at increasing the service life of the drill string elements through lining a contact surface on one of the drill string elements or the free end of the other drill string element with a wear resistant additional material, e.g. a stellite, applied by means of welding or soldering. It is also an aim of the present invention to obtain the increase of the service life at a substantiality lower cost
  • fig 1 shows a first embodiment of a thread coupling according to the invention, partly in section.
  • Fig 2 shows a part of a thread coupling according to a second embodiment of the invention.
  • the embodiment of the invention shown in fig 1 comprises a first drill string element 2 and a second drill string element 6.
  • the first drill string element 2 is provided with an internal thread 3 and a free end 4.
  • the second drill sting element 6 is provided with a spigot 7 having an external thread 8.
  • the second drill string element is provided with a contact surface 10.
  • the contact surface 10 and the free end 4 are situated in a plane being perpendicular to the longitudinal axis 1 1 of the thread coupling and are intended for abutting each other.
  • the annular contact surface 10 is provided with a lining of a wear resistant additional material. It has turned out to be suitable to choose a stellite which makes it possible to keep the porosity low.
  • a stellite which makes it possible to keep the porosity low.
  • An example of such a material is stellite 6.
  • the wear resistant additional material does not extend entirely out to to the external diameter of the drill string element since this decreases the risk that the wear resistant additional material falls off during operation.
  • the depth of the lining should be 0.5-5 mm. It has turned out to be particularly advantageous to apply the wear resistant material by means of plasma welding.
  • Fig 2 shows a part of a modified embodiment of the thread coupling.
  • the wear resistant material is here made as a ring 13 which has been soldered to the contact surface 10.
  • a hard metal e.g. a carbide containing 5-20% Co, is chosen.
  • the embodiment is in other respects made as in the example in fig 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)

Abstract

Thread coupling for percussive drilling. The thread coupling comprises a first drill string element (2) with an internal thread (3) and a second drill string element (6) with a spigot (7) which is privided with an external thread (8) for cooperation with the internal thread (3). A contact surface (10) on the second drill string element (6) is lined with a wear resistant additional material which covers 50-100%, preferably 50-90%, of the contact surface. The wear resistant material is preferably a stellite which has been applied by means of plasma welding or which is a ring which has been soldered to the contact surface.

Description

Thread coupling for drill string elements for percussive drilling
The present invention relates to a thread coupling for drill string elements for percussive drilling.
In earlier efforts to prolong the service life of the drill tubes at percussive drilling, see US-A-4 968 068, it is ascertained that the spigot on one of the drill string elements is somewhat shorter, 0-1 mm, than the distance between the free end and the bottom surface of the sleeve formed part of the other drill string element. The reason for arranging this clearance at the manufacturing is that one wants to assure that contact is not achieved only between the outer end of the spigot and the bottom surface of the sleeve formed part. It is also said that the ideal condition is that one has contact both at the free end and the bottom surface of the sleeve formed part. This condition cannot be achieved at the manufacturing because of manufacturing tolerances. It is also said that the original bottom clearance between the two drill string elements will be eliminated because of wear before 20% of the service life of the thread coupling has been used. The goal according to US-A-4 968 068 is thus to keep the original bottom clearance small so that one quickly obtains the double contact between the two drill string components. This results in the drawbacks that the hardening at the free end of the sleeve formed part and the cooperating contact surface is badly used since one very soon transfers the wear to the threads of the two drill string elements.
The present invention, which is defined in the appended claims, aims at increasing the service life of the drill string elements through lining a contact surface on one of the drill string elements or the free end of the other drill string element with a wear resistant additional material, e.g. a stellite, applied by means of welding or soldering. It is also an aim of the present invention to obtain the increase of the service life at a substantiality lower cost
Two embodiments of the invention are described below with reference to the accompanying drawings in which fig 1 shows a first embodiment of a thread coupling according to the invention, partly in section. Fig 2 shows a part of a thread coupling according to a second embodiment of the invention. The embodiment of the invention shown in fig 1 comprises a first drill string element 2 and a second drill string element 6. The first drill string element 2 is provided with an internal thread 3 and a free end 4. The second drill sting element 6 is provided with a spigot 7 having an external thread 8. At the inner end of the spigot the second drill string element is provided with a contact surface 10. The contact surface 10 and the free end 4 are situated in a plane being perpendicular to the longitudinal axis 1 1 of the thread coupling and are intended for abutting each other. The annular contact surface 10 is provided with a lining of a wear resistant additional material. It has turned out to be suitable to choose a stellite which makes it possible to keep the porosity low. An example of such a material is stellite 6. The material should have about the same hardness as the underlying material, i.e. HRC=35-45, and cover 50- 100%, preferably 50-90%, of the contact surface. It har turned out to be particularly advantageous if the wear resistant additional material does not extend entirely out to to the external diameter of the drill string element since this decreases the risk that the wear resistant additional material falls off during operation. The depth of the lining should be 0.5-5 mm. It has turned out to be particularly advantageous to apply the wear resistant material by means of plasma welding.
Fig 2 shows a part of a modified embodiment of the thread coupling. The wear resistant material is here made as a ring 13 which has been soldered to the contact surface 10. As material a hard metal, e.g. a carbide containing 5-20% Co, is chosen. The embodiment is in other respects made as in the example in fig 1.

Claims

Claims:
1. Thread coupling for percussive drilling comprising a first drill string element (2) provided with an internal thread (3) at a free end (4) and a second drill string element (6) provided with a spigot (7) which is provided with an external thread (8) for cooperation with the internal thread (3) on the first drill string element (2), whereby said second drill string element (6) is provided with a contact surface (10) for cooperation with said free end (4) on said first drill string element (2), characterized in that said contact surface (10) or said free end (4) is provided with a lining (12) of a wear resistant additional material which has been applied by means of welding or soldering, that said wear resistant additional material covers 50-100% of said contact surface (10) and has a depth of 0.5-5 mm.
2. Thread coupling according to claim 1, characterized in that said wear resistant material is a stellite.
3. Thread coupling according to claim l or2, characterized in that said wear resistant material has been applied by means of plasma welding.
4. Thread coupling according to claim l or2, characterized in that said wear resistant material is a ring (13) which has been soldered to said contact surface (10).
5. Thread coupling according to claim 4, characterized in that said ring is made of a hard metal comprising 5-20% Co.
6. Thread coupling according to any of the preceding claims, characterized in that said wear resistant material covers 50-90% of said contact surface (10) and has a maximum diameter which is smaller than the outer diameter of said contact surface.
PCT/SE1995/001381 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling Ceased WO1996016246A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU39972/95A AU688998B2 (en) 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling
DE69515686T DE69515686T2 (en) 1994-11-23 1995-11-21 SCREW CONNECTION FOR DRILL ROD ELEMENTS FOR IMPACT DRILLING
US08/849,322 US5785360A (en) 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling
CA002205902A CA2205902C (en) 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling
EP95938689A EP0793764B1 (en) 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling
AT95938689T ATE190694T1 (en) 1994-11-23 1995-11-21 SCREW CONNECTION FOR DRILL ROD ELEMENTS FOR IMPACT DRILLING
FI972183A FI107825B (en) 1994-11-23 1997-05-22 Thread coupling of drill string elements for impact drilling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9404051A SE506695C2 (en) 1994-11-23 1994-11-23 Threaded joint for striking drilling
SE9404051-6 1994-11-23

Publications (1)

Publication Number Publication Date
WO1996016246A1 true WO1996016246A1 (en) 1996-05-30

Family

ID=20396077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/001381 Ceased WO1996016246A1 (en) 1994-11-23 1995-11-21 Thread coupling for drill string elements for percussive drilling

Country Status (11)

Country Link
US (1) US5785360A (en)
EP (1) EP0793764B1 (en)
AT (1) ATE190694T1 (en)
AU (1) AU688998B2 (en)
CA (1) CA2205902C (en)
DE (1) DE69515686T2 (en)
ES (1) ES2145309T3 (en)
FI (1) FI107825B (en)
RU (1) RU2155852C2 (en)
SE (1) SE506695C2 (en)
WO (1) WO1996016246A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE515518C2 (en) * 1998-09-28 2001-08-20 Uniroc Ab String drill string thread for striking rock drilling
SE0000701L (en) * 2000-03-02 2001-06-25 Sandvik Ab Threaded joints and rock drill elements for striking drilling
SE522221C2 (en) * 2001-10-12 2004-01-27 Sandvik Ab Striking rock drill joints
SE520077C2 (en) * 2002-06-27 2003-05-20 Sandvik Ab Male part for percussion drilling of rock, has threaded end section with specific geometry adjacent to stop surface
SE525431C2 (en) * 2003-02-24 2005-02-22 Sandvik Ab Trade for striking drilling
JP4954542B2 (en) * 2005-12-09 2012-06-20 三菱マテリアル株式会社 Drilling rod, drilling bit and drilling tool
SE531459C2 (en) * 2006-05-17 2009-04-14 Sandvik Intellectual Property Hondel and the procedure for the manufacture of female parts
SE0702638L (en) * 2007-11-21 2008-07-29 Sandvik Intellectual Property Percussion drill bit for rock drilling and a method for manufacturing such a drill bit
SE534450C2 (en) 2009-07-01 2011-08-30 Atlas Copco Rock Drills Ab Device and method for protecting a rock drill against corrosion attack
SE535814C2 (en) 2011-05-20 2013-01-02 Atlas Copco Secoroc Ab Threading device, threaded joint and drill string component for striking rock drilling

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR984664A (en) * 1948-05-15 1951-07-09 Hughes Tool Co Connection with threaded elements applicable in particular to well drilling equipment
WO1987004487A1 (en) * 1986-01-17 1987-07-30 Lövab Löf Och Östlund Ab Drill tool
SE469603B (en) * 1988-07-08 1993-08-02 Sandvik Ab GAENGFOERBAND

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052019A (en) * 1931-12-26 1936-08-25 Timken Roller Bearing Co Separable drill bit
US2772899A (en) * 1948-05-15 1956-12-04 Hughes Tool Co Threaded oil well drill stem connection with the threads having included crest angleof 90 degrees
US3489445A (en) * 1967-10-18 1970-01-13 Archer W Kammerer Jr Threaded sucker rod joint
SE469602B (en) * 1985-04-04 1993-08-02 Sandvik Ab CUTTING HEAD BEFORE SHOCK DRILLING
SU1432183A1 (en) * 1986-01-31 1988-10-23 Ф.М. Толстихин Device for connecting rods of churn drilling tool
SU1550078A1 (en) * 1987-12-14 1990-03-15 Специальное Конструкторское Бюро Всесоюзного Промышленного Объединения "Союзгеотехника" Threaded joint of pipes
SE501356C2 (en) * 1993-07-02 1995-01-23 Uniroc Ab Threaded joint for drill string elements for striking drilling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR984664A (en) * 1948-05-15 1951-07-09 Hughes Tool Co Connection with threaded elements applicable in particular to well drilling equipment
WO1987004487A1 (en) * 1986-01-17 1987-07-30 Lövab Löf Och Östlund Ab Drill tool
SE469603B (en) * 1988-07-08 1993-08-02 Sandvik Ab GAENGFOERBAND

Also Published As

Publication number Publication date
DE69515686T2 (en) 2000-11-23
ATE190694T1 (en) 2000-04-15
EP0793764A1 (en) 1997-09-10
EP0793764B1 (en) 2000-03-15
RU2155852C2 (en) 2000-09-10
SE9404051D0 (en) 1994-11-23
AU3997295A (en) 1996-06-17
US5785360A (en) 1998-07-28
SE506695C2 (en) 1998-02-02
DE69515686D1 (en) 2000-04-20
FI107825B (en) 2001-10-15
AU688998B2 (en) 1998-03-19
SE9404051L (en) 1996-05-24
CA2205902A1 (en) 1996-05-30
ES2145309T3 (en) 2000-07-01
FI972183A0 (en) 1997-05-22
FI972183L (en) 1997-05-22
CA2205902C (en) 2005-08-09

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