WO2004074624A1 - Outil - Google Patents

Outil Download PDF

Info

Publication number
WO2004074624A1
WO2004074624A1 PCT/SE2004/000210 SE2004000210W WO2004074624A1 WO 2004074624 A1 WO2004074624 A1 WO 2004074624A1 SE 2004000210 W SE2004000210 W SE 2004000210W WO 2004074624 A1 WO2004074624 A1 WO 2004074624A1
Authority
WO
WIPO (PCT)
Prior art keywords
male portion
layer
portion according
steel
thread
Prior art date
Application number
PCT/SE2004/000210
Other languages
English (en)
Inventor
Johan Linden
Per-Olof Liljebrand
Original Assignee
Sandvik Intellectual Property 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 Intellectual Property Ab filed Critical Sandvik Intellectual Property Ab
Priority to EP04712263A priority Critical patent/EP1597454B1/fr
Publication of WO2004074624A1 publication Critical patent/WO2004074624A1/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
    • 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 male portion for percussive drilling according to the preamble of the appended independent claim.
  • a gap is formed between co-operating shoulders of the tubes or rods included in the drill string after each shock wave. Water is collected on the surface of the shoulder between each shock wave so that each impact provides a jet stream of water away from the impact surface. The part of the jet stream that then travels radially inwards will give rise to damage on associated male portion, see Figs. 1A and 1 B, and finally the male portion will break so that the drilling cannot be continued.
  • a male portion is shown where a threaded portion has been provided with a metallic material, which is more precious than the steel in the male portion. Thereby, it is intended to solve the problem of corrosion fatigue in the threads by coating at least the parts of the thread of the male portion that co-operate with other parts of the threaded joint.
  • An object of the present invention is to substantially decrease the damage on a male portion for percussive rock drilling.
  • Another object of the present invention is to substantially improve the resistance to erosion corrosion in sections having a reduced cross-section in a male portion for percussive rock drilling.
  • Fig. 1A shows a conventional male portion after erosion corrosion.
  • Fig. 1 B shows a cross-section of a threaded joint having the conventional male portion.
  • Fig. 2A shows a shows a threaded joint having a male portion according to the present invention in longitudinal cross-section.
  • Fig. 2B shows an enlarged cross-section of the male portion according to the present invention.
  • Fig. 2C shows a cross-section of the male portion according to the present invention.
  • the threaded joint shown in Figs. 2A and 2B for percussive drilling comprises a sleeve-shaped portion or a female portion 11 having a cylindrical female thread or cylindrical internal thread 12 in co-operation with a pin or male portion 13 according to the present invention provided with a cylindrical male thread or cylindrical external thread 14.
  • the male portion 13 and the female portion 11 constitute integrated parts of identical drill elements or drill tubes 10A, 10B.
  • the shown thread is a so-called trapezoidal thread but other thread shapes may be possible, e.g. a rope thread.
  • the male portion has a through flush channel 15, through which a flush medium, usually air or water, is led.
  • the threads 12, 14 comprise thread flanks and thread roots arranged between the flanks.
  • the male thread 14 is terminated, in the direction of the other end of the tube, in a clearance surface 16.
  • the clearance surface 16 connects via a con- cave portion 17 to a shoulder 18, which is substantially perpendicular to the centre line CL of the threaded joint.
  • the shoulder 18 connects in turn to the envelope surface of the tube 10A.
  • the concave portion 17 is preferably softly rounded, such as via a radius.
  • the female portion 11 has an end surface 19 arranged on the free end thereof, which is substantially perpendicular to the centre line CL of the threaded joint.
  • the end surface 19 and the shoulder 18 abuts against each other.
  • the part of the jet stream that travels radially inwards has an angle of action of about 90° and when it meets the surface in the concave portion, a protective layer of oxide on the surface is broken.
  • the exposed pure metal surface then oxidizes (corrodes) again before the oxide thereof again is torn away. This course of events gives rise to accelerated so- called erosion corrosion.
  • the concave portion 17 of the male portion is provided with a coating consisting of at least one surface-modifying, erosion-protecting layer 20.
  • the layer is continuous in the direction of circumference. The layer follows the curvature in the portion 17.
  • the maximum thickness of layer is 0,002-5 mm, preferably 0,02-2 mm.
  • the layer 20 is more resistant to erosion corrosion than the supporting or subjacent steel. Examples of such erosion corrosion-resistant materials are nickel, chromium, copper, tin, cobalt and titanium as well as alloys of these, preferably erosion- resistant steels or Co or Ni base alloys. Additional layers may be made in order to increase the binding between coating and steel.
  • the material in the layer 20 has at least 50 mV higher electrode potential than the steel, preferably at least 100 mV, most preferably at least 250 mV higher electrode potential than the steel.
  • a number of different surface-coating methods may be used in order to apply the layer, e.g. chemical or electrolytic plating, thermal spraying or tool-tipping, preferably tool-tipping by means of laser.
  • the invention relates to a male portion for percussive drilling having a concave portion, which is coated with a protective layer in order to substantially improve the resistance to erosion of a low-alloy steel body.

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)

Abstract

L'invention concerne une partie mâle utile dans le forage par percussion et qui comprend un filetage extérieur (14). La partie mâle (13) fait partie intégrante d'un élément de forage (10A) et comporte un passage (15) de rinçage pour milieu de rinçage. Le filetage extérieur (14) comprend des flancs de filet conçus pour le forage par percussion. Le filetage se termine dans une surface libre (16). Ladite surface (16) est reliée par une partie concave (17) à un épaulement (18). L'épaulement sert à transférer les ondes de choc. La partie concave (17) de la partie mâle comporte un revêtement constitué d'au moins une couche (20) de protection contre l'abrasion et la corrosion.
PCT/SE2004/000210 2003-02-24 2004-02-18 Outil WO2004074624A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04712263A EP1597454B1 (fr) 2003-02-24 2004-02-18 Outil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0300498A SE525431C2 (sv) 2003-02-24 2003-02-24 Handel för slående borrning
SE0300498-3 2003-02-24

Publications (1)

Publication Number Publication Date
WO2004074624A1 true WO2004074624A1 (fr) 2004-09-02

Family

ID=20290492

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/000210 WO2004074624A1 (fr) 2003-02-24 2004-02-18 Outil

Country Status (3)

Country Link
EP (1) EP1597454B1 (fr)
SE (1) SE525431C2 (fr)
WO (1) WO2004074624A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006110086A1 (fr) * 2005-04-14 2006-10-19 Sandvik Intellectual Property Ab Amenagement d'elements de forage par percussion et element de forage par percussion comprenant un joint filete
CN102704863A (zh) * 2012-06-20 2012-10-03 中国石油天然气集团公司 防热裂钻杆内螺纹接头及其制备方法
US10060206B2 (en) 2010-01-11 2018-08-28 Epiroc Rock Drills Aktiebolag Percussion rock drilling machine and drill rig

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002729A1 (fr) * 1994-07-19 1996-02-01 Sandvik Ab Raccord filete
EP0771934A2 (fr) * 1995-11-04 1997-05-07 Hawera Probst GmbH Accouplement pour tiges de forage à percussion
US5785360A (en) * 1994-11-23 1998-07-28 Uniroc Ab Thread coupling for drill string elements for percussive drilling
US5984030A (en) * 1995-03-27 1999-11-16 Sandvik Ab Rock drilling tool, drill bit and a method of transferring percussive energy
WO2001038686A1 (fr) * 1999-11-26 2001-05-31 Sandvik Ab; (Publ) Joint filete a partie male et partie femelle
US20010018990A1 (en) * 2000-03-02 2001-09-06 Bengt Asberg Rock drill bit having retrac teeth and method for its manufacturing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002729A1 (fr) * 1994-07-19 1996-02-01 Sandvik Ab Raccord filete
US5785360A (en) * 1994-11-23 1998-07-28 Uniroc Ab Thread coupling for drill string elements for percussive drilling
US5984030A (en) * 1995-03-27 1999-11-16 Sandvik Ab Rock drilling tool, drill bit and a method of transferring percussive energy
EP0771934A2 (fr) * 1995-11-04 1997-05-07 Hawera Probst GmbH Accouplement pour tiges de forage à percussion
WO2001038686A1 (fr) * 1999-11-26 2001-05-31 Sandvik Ab; (Publ) Joint filete a partie male et partie femelle
US20010018990A1 (en) * 2000-03-02 2001-09-06 Bengt Asberg Rock drill bit having retrac teeth and method for its manufacturing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006110086A1 (fr) * 2005-04-14 2006-10-19 Sandvik Intellectual Property Ab Amenagement d'elements de forage par percussion et element de forage par percussion comprenant un joint filete
US10060206B2 (en) 2010-01-11 2018-08-28 Epiroc Rock Drills Aktiebolag Percussion rock drilling machine and drill rig
CN102704863A (zh) * 2012-06-20 2012-10-03 中国石油天然气集团公司 防热裂钻杆内螺纹接头及其制备方法

Also Published As

Publication number Publication date
SE525431C2 (sv) 2005-02-22
SE0300498L (sv) 2004-08-25
SE0300498D0 (sv) 2003-02-24
EP1597454B1 (fr) 2006-07-05
EP1597454A1 (fr) 2005-11-23

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