EP1597454A1 - Werkzeug - Google Patents

Werkzeug

Info

Publication number
EP1597454A1
EP1597454A1 EP04712263A EP04712263A EP1597454A1 EP 1597454 A1 EP1597454 A1 EP 1597454A1 EP 04712263 A EP04712263 A EP 04712263A EP 04712263 A EP04712263 A EP 04712263A EP 1597454 A1 EP1597454 A1 EP 1597454A1
Authority
EP
European Patent Office
Prior art keywords
male portion
layer
portion according
steel
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.)
Granted
Application number
EP04712263A
Other languages
English (en)
French (fr)
Other versions
EP1597454B1 (de
Inventor
Johan Linden
Per-Olof Liljebrand
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 Intellectual Property AB
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
Publication of EP1597454A1 publication Critical patent/EP1597454A1/de
Application granted granted Critical
Publication of EP1597454B1 publication Critical patent/EP1597454B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 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)
EP04712263A 2003-02-24 2004-02-18 Werkzeug Expired - Lifetime EP1597454B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0300498 2003-02-24
SE0300498A SE525431C2 (sv) 2003-02-24 2003-02-24 Handel för slående borrning
PCT/SE2004/000210 WO2004074624A1 (en) 2003-02-24 2004-02-18 Tool

Publications (2)

Publication Number Publication Date
EP1597454A1 true EP1597454A1 (de) 2005-11-23
EP1597454B1 EP1597454B1 (de) 2006-07-05

Family

ID=20290492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04712263A Expired - Lifetime EP1597454B1 (de) 2003-02-24 2004-02-18 Werkzeug

Country Status (3)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528777C2 (sv) * 2005-04-14 2007-02-13 Sandvik Intellectual Property Hangängade och hongängade borrkomponenter och ett gängförband utformat därmed
SE534770C2 (sv) 2010-01-11 2011-12-13 Atlas Copco Rock Drills Ab Slående bergborrmaskin innefattande en frontdel med ett spolhus
CN102704863B (zh) * 2012-06-20 2015-05-06 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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE505073C2 (sv) * 1994-07-19 1997-06-23 Sandvik Ab Gängförband för slående borrning
SE506695C2 (sv) * 1994-11-23 1998-02-02 Uniroc Ab Gängskarv för slående borrning
SE505068C2 (sv) * 1995-03-27 1997-06-23 Sandvik Ab Förfarande för att överföra slagenergi från ett slagborrverktyg till ett borrhål, bergborrverktyg och borrkrona för slående borrning
DE19541163A1 (de) * 1995-11-04 1997-05-07 Hawera Probst Kg Hartmetall Bohrwerkzeug, insbesondere zur Bearbeitung von Gestein
SE516651C2 (sv) * 1999-11-26 2002-02-05 Sandvik Ab Gängförband för slående borrning, en handel och en hondel
SE0000688L (sv) * 2000-03-02 2001-05-21 Sandvik Ab Bergborrkrona samt förfarande för dess tillverkning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004074624A1 *

Also Published As

Publication number Publication date
SE0300498D0 (sv) 2003-02-24
SE525431C2 (sv) 2005-02-22
EP1597454B1 (de) 2006-07-05
WO2004074624A1 (en) 2004-09-02
SE0300498L (sv) 2004-08-25

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