EP2845991A1 - Bohrstrangstange mit verstärkter Stutzenkupplung - Google Patents

Bohrstrangstange mit verstärkter Stutzenkupplung Download PDF

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Publication number
EP2845991A1
EP2845991A1 EP13183491.3A EP13183491A EP2845991A1 EP 2845991 A1 EP2845991 A1 EP 2845991A1 EP 13183491 A EP13183491 A EP 13183491A EP 2845991 A1 EP2845991 A1 EP 2845991A1
Authority
EP
European Patent Office
Prior art keywords
rod
transition region
section
shank
threaded section
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
EP13183491.3A
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English (en)
French (fr)
Other versions
EP2845991B1 (de
Inventor
Tomas Jansson
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
Priority to EP13183491.3A priority Critical patent/EP2845991B1/de
Priority to PCT/EP2014/068124 priority patent/WO2015032660A1/en
Publication of EP2845991A1 publication Critical patent/EP2845991A1/de
Application granted granted Critical
Publication of EP2845991B1 publication Critical patent/EP2845991B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 drill string rod to form part of a drill string having a male spigot portion provided at one end of the rod and in particular, although not exclusively, to a spigot portion having a threaded section and a non-threaded shank configured to minimise stress concentrations.
  • 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 threaded ends.
  • the well-established technique breaks rock by hammering impacts transferred from the rock drill bit, mounted at one end of the drill string, to the rock at the bottom of the borehole.
  • 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 and ultimately to the base rock level.
  • the transition between the different diameters of the threaded male spigot and the main length of the drill rod provides a region for potentially high stress concentrations due to bending moments and tensile loads.
  • the outside diameter of the rod at the transition axially between the threaded male spigot and the main length or shoulder is flared radially outward with a curved shape profile having a single radius curvature that is as large as can be accommodated between the two regions.
  • the transition region reaches a stress level of approximately 300 MPa.
  • Drill rods are typically replaced periodically according to their predetermined lifetime to try and avoid fracture of the male spigot during use which would cause significant disruption to a drilling operation. There is therefore a need for a drill rod that addresses these problems.
  • the objectives are achieved by specifically configuring a transition region positioned axially at the interface with the end of the main length section, or an annular shoulder at the end of the main length section, and the male spigot that comprises a gradually increasing cross sectional area or diameter in a direction from the spigot threaded end towards the main length section or shoulder.
  • the present invention provides a drill rod coupling that exhibits no or minimal stress concentrations at the junction of the male spigot with the main length section resultant from incident bending moments or tensile loads.
  • a drill string rod to form a part of a drill string, the rod comprising: an elongate hollow main length section extending axially between a first end and a second end; a male spigot portion provided at the second end having an externally threaded section and a non-threaded shank positioned axially intermediate the main length section and the threaded section; the shank having a transition region positioned adjacent the main length section or a radially projecting shoulder at the second end, the transition region having an outside diameter that increases in a direction from the spigot section to the main length section or the shoulder; wherein a cross sectional profile of an outer surface of the rod at the transition region in a plane extending in a longitudinal axis of the rod is curved; characterised in that : a curvature of the transition region axially closest to the main length section or the shoulder comprises a first radius of curvature that is less than a second radius of curvature of the outer surface at
  • 'curvature' encompasses a smooth or gradual change in surface profile and a plurality of sequential linear increases (or decreases) in diameter that collectively may be regarded as a 'curved' shape profile.
  • 'curvature' encompasses relatively small linear step changes such that an edge or middle region of each step may be considered to collectively define a curve.
  • the rod comprises a shoulder projecting radially from the main length section wherein an outside diameter of the shoulder is greater than an outside diameter of the main length section and the transition region of the shank.
  • a shoulder projecting radially from the main length section wherein an outside diameter of the shoulder is greater than an outside diameter of the main length section and the transition region of the shank.
  • a side surface of the shoulder that is in contact with the transition region comprises an annular radially outer region that is aligned substantially perpendicular to the longitudinal axis.
  • the curved transition region therefore does not continue over the full radial length of the annular side surface to provide a flat annular surface for contact by the annular end face of the female sleeve.
  • a cross sectional shape profile of the outer surface of the transition region in the plane of the longitudinal axis comprises a segment of an ellipse.
  • the segment is substantially one quarter of a perimeter of the ellipse.
  • a cross sectional shape profile of the outer surface of the transition region in the plane of the longitudinal axis comprises a polynomial.
  • the profile corresponds to a second degree parabola.
  • the present transition configuration also provides that the transition region begins at an axial position close to the threaded section such that at least half or a majority of the axial length of the non-threaded shank comprises a diameter or cross sectional area that increases in a direction towards the main length section or shoulder.
  • an axial length of the transition region is substantially equal to an axial length of the shank at a region axially between the transition region and the threaded section.
  • an axial length of the outer surface of the transition region having the first radius of curvature is greater than an axial length of the outer surface of the transition region having the second radius of curvature.
  • an outside diameter of the shank axially between the threaded section and the transition region is substantially equal to an outside diameter of the main length section.
  • an outside diameter of the shank is at least equal to an outside diameter of the main length section along a full axial length of the shank axially between the threaded section and the main length section or the shoulder.
  • the threaded section comprises at least one axially extending helical ridge and groove, wherein an outside diameter of the shank axially between the threaded section and the transition region is substantially equal to an outside diameter of the threaded section at an axial and a radial position corresponding to the ridge of the threaded section.
  • the threaded section comprises a plurality of threads formed as a double or triple helix etc. Such configurations can be selected to achieve a desired threaded profile having desired mechanical and physical properties.
  • a cross sectional area of the shank is at least equal to a cross sectional area of the main length section in a plane perpendicular to the longitudinal axis over a full axial length of the shank between the threaded section and the main length section or the shoulder. Accordingly, the shank is configured to be robust during bending moments and tensile loads and to avoid creation of stress concentrations resultant from changes in diameter along the length of the rod.
  • the first end comprises a female hollow portion having an internal threaded section to engage with the threaded section of the male spigot portion of a neighbouring rod of the drill string.
  • an internal diameter of the threaded section of the female portion is substantially equal to an outside diameter of the main length section.
  • the present coupling therefore provides a region that is enlarged in diameter and cross sectional area (perpendicular to the longitudinal axis of the rod) relative to the elongate hollow main length section.
  • a drill string comprising a drill string rod as claimed herein.
  • a drill string comprises a plurality of interconnected drill string rods 100.
  • Each rod 100 comprises a main length section 101 having a first end 105 and a second end 106.
  • An outside diameter of the main length section 101 increases at each end 105, 106 to form a radially flared end coupling region 103, 104 respectively.
  • a part of each coupling region 103, 104 comprises a threaded portion to allow the regions 103, 104 to engage one another and form a secure threaded coupling 102 to interconnect a plurality of rods 100 to form the drill string.
  • male end 103 comprises an annular shoulder 110 from which projects axially a male spigot 108.
  • Spigot 108 is divided axially into an endmost threaded section 107 and a non-threaded shank 109 positioned axially intermediate threaded section 107 and shoulder 110.
  • An internal bore 113 extends axially through main length section 101 and spigot 108 of uniform internal diameter.
  • Female end 104 comprises a hollow sleeve 111 having cooperating threads 112 formed at the internal surface of the sleeve 111 so as to cooperate with the threaded turns of the male threaded section 107.
  • the tubular main length section 101 comprises a cylindrical external surface 200 that is flared radially outward at shoulder 110 to provide a annular concave region 201 that terminates at a cylindrical surface 202 located at shoulder 110.
  • a diameter and cross sectional area of surface 202 in a plane perpendicular to axis 204 is accordingly greater than a corresponding diameter or cross sectional area (in a parallel plane) of main length surface 200.
  • Shoulder 110 in particular cylindrical surface 202 is terminated at the spigot side by an annular side surface 203 aligned perpendicular to axis 204.
  • Spigot 108 projects axially from a radially inward region of surface 203 and is aligned coaxial with main length section 101 and the annular shoulder 110. As illustrated in figure 1 , spigot 108 comprises a generally tubular configuration such that an internal diameter of the bore within the spigot 108 is equal to the internal diameter of the bore 113 extending through main length section 101.
  • Threaded section 107 comprises a pair of helical turns 209 that extend axially from shank 109 to spigot end 114.
  • a pair of helical ridges 207 and troughs 208 extend axially over section 107.
  • the non-threaded shank 109 may be divided axially into a first length part 205, positioned axially closest to threaded section 107, and a second length part 206, positioned axially closest to side surface 203.
  • a combined axial length of the parts 205, 206 is greater than an axial length of shoulder surface 202 but less than an axial length of threaded section 107.
  • An external surface of length part 205 is substantially parallel to axis 204 whilst the external surface of length part 206 tapers radially outward in a direction from threaded section 107 to contact against annular side surface 203. Accordingly, a diameter or cross sectional area of part 205 is less than a diameter or cross sectional area of part 206. Additionally, a diameter or cross sectional area of part 205 is approximately equal to a diameter or cross sectional area of the threaded section 107 at an axial and radial position corresponding to the radially outermost part of peak 207.
  • length part 206 may be considered a transition region between spigot 108 and the annular shoulder 110. As illustrated in figure 3 , the transition region 206 is further divided axially into a first transition 300, axially closest to threaded section 107, and a second transition 301 axially closest to side surface 203. A diameter and cross sectional area of the first transition 300 increases from length part 205 such that the external surface profile of first transition 300 in a plane along axis 204 is curved according to a gradual curvature having a relatively large radius.
  • the second transition 301 comprises a corresponding cross sectional shape profile in the same plane that is curved relatively steeply and with a relatively smaller radius of curvature.
  • the rate of change of the diameter and cross sectional area increases significantly when passing from the first transition 300 and extending along the second transition 301.
  • the surface profile of the transition region 206 between length part 205 and shoulder 110 corresponds to a quarter segment of a perimeter of an ellipse.
  • a curvature over transition region 206 may correspond to a polynomial and in particular a double parabola.
  • an axial length of second transition 301 is less than that of first transition 300.
  • the configuration of transition region 206 provides that the diameter of shank 109 starts to increase at a greater axial distance from shoulder 110 with respect to conventional threaded spigot embodiments.
  • the increased axial length of the transition region 206 together with the plurality of sub-transition regions 300, 301 (having different or non-uniform curvature in the axial direction) provides a male coupling end exhibiting enhanced stiffness and that is more resilient to bending moments and tensile forces with respect to conventional couplings.
  • transition region 206 is configured to eliminate or at least minimise stress concentrations at the region where spigot 108 projects axially from shoulder 110.
  • transition region 206 may comprise a frusto conical configuration or a combination of frusto conical sections and curved sections with respect to the outside surface shape profile in the plane parallel to axis 204.

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  • 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)
EP13183491.3A 2013-09-09 2013-09-09 Bohrstrangstange mit verstärkter Stutzenkupplung Not-in-force EP2845991B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13183491.3A EP2845991B1 (de) 2013-09-09 2013-09-09 Bohrstrangstange mit verstärkter Stutzenkupplung
PCT/EP2014/068124 WO2015032660A1 (en) 2013-09-09 2014-08-27 Drill string rod with strengthened spigot coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13183491.3A EP2845991B1 (de) 2013-09-09 2013-09-09 Bohrstrangstange mit verstärkter Stutzenkupplung

Publications (2)

Publication Number Publication Date
EP2845991A1 true EP2845991A1 (de) 2015-03-11
EP2845991B1 EP2845991B1 (de) 2015-11-18

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EP (1) EP2845991B1 (de)
WO (1) WO2015032660A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3095954A1 (de) * 2015-05-22 2016-11-23 Sandvik Intellectual Property AB Bohrstange oder adapter mit verstärkter stutzenkupplung
US10677054B2 (en) 2015-07-31 2020-06-09 Joy Global Underground Mining Llc Cutting bit assembly
EP3741956A1 (de) * 2019-05-23 2020-11-25 Sandvik Mining and Construction Tools AB Bohrstrangstange
EP3879065A1 (de) 2020-03-11 2021-09-15 Sandvik Mining and Construction Tools AB Elliptisches design für aussengewindeabstand
EP4047178A1 (de) * 2021-02-17 2022-08-24 Sandvik Mining and Construction Tools AB Elliptisches design für sechseckige schäfte
WO2023144377A1 (en) 2022-01-31 2023-08-03 Sandvik Mining And Construction Tools Ab Drilling component

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3095955A1 (de) 2015-05-22 2016-11-23 Sandvik Intellectual Property AB Kupplungsende mit gewinde für bohrstrangkomponente

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926925A (en) 1931-04-07 1933-09-12 Gulf Res & Dev Corp Pin, bolt, and other connecting device
US4076436A (en) * 1975-01-06 1978-02-28 Bowen Tools, Inc. Stress relieved tool elements
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
US4687368A (en) 1985-04-04 1987-08-18 Santrade Limited Thread structure for percussion rock drilling
US5169183A (en) 1987-05-12 1992-12-08 Diamant Boart Stratabit S.A. Threaded joint for drill rod elements
GB2321073A (en) 1997-01-06 1998-07-15 Boart Longyear Inc Straight hole drilling system
US6030004A (en) * 1997-12-08 2000-02-29 Shaw Industries High torque threaded tool joint for drill pipe and other drill stem components
US6767156B1 (en) 1999-11-26 2004-07-27 Sandvik Ab Thread joint and threaded components for percussive drilling components
EP1705415A2 (de) 2005-03-22 2006-09-27 Intelliserv Inc Rohrgewindeverbindung
CA2634557A1 (en) * 2008-05-07 2009-11-07 Dover Corporation (Canada) Limited Sucker rod
EP3298229A1 (de) 2015-05-22 2018-03-28 Sandvik Intellectual Property AB Bohrstange oder adapter mit verstärkter stutzenkupplung

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926925A (en) 1931-04-07 1933-09-12 Gulf Res & Dev Corp Pin, bolt, and other connecting device
US4076436A (en) * 1975-01-06 1978-02-28 Bowen Tools, Inc. Stress relieved tool elements
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
US4687368A (en) 1985-04-04 1987-08-18 Santrade Limited Thread structure for percussion rock drilling
US5169183A (en) 1987-05-12 1992-12-08 Diamant Boart Stratabit S.A. Threaded joint for drill rod elements
GB2321073A (en) 1997-01-06 1998-07-15 Boart Longyear Inc Straight hole drilling system
US6030004A (en) * 1997-12-08 2000-02-29 Shaw Industries High torque threaded tool joint for drill pipe and other drill stem components
US6767156B1 (en) 1999-11-26 2004-07-27 Sandvik Ab Thread joint and threaded components for percussive drilling components
EP1705415A2 (de) 2005-03-22 2006-09-27 Intelliserv Inc Rohrgewindeverbindung
CA2634557A1 (en) * 2008-05-07 2009-11-07 Dover Corporation (Canada) Limited Sucker rod
EP3298229A1 (de) 2015-05-22 2018-03-28 Sandvik Intellectual Property AB Bohrstange oder adapter mit verstärkter stutzenkupplung

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3298229B1 (de) 2015-05-22 2020-10-14 Sandvik Intellectual Property AB Bohrstange oder adapter mit verstärkter stutzenkupplung
EP3095954A1 (de) * 2015-05-22 2016-11-23 Sandvik Intellectual Property AB Bohrstange oder adapter mit verstärkter stutzenkupplung
CN107683363A (zh) * 2015-05-22 2018-02-09 山特维克知识产权股份有限公司 具有加强的插头联接的钻杆或者转接器
US20180135782A1 (en) * 2015-05-22 2018-05-17 Sandvik Intellectual Property Ab Drill rod or adaptor with strengthened spigot coupling
AU2016266604B2 (en) * 2015-05-22 2020-09-10 Sandvik Intellectual Property Ab Drill rod or adaptor with strengthened spigot coupling
WO2016188862A1 (en) * 2015-05-22 2016-12-01 Sandvik Intellectual Property Ab Drill rod or adaptor with strengthened spigot coupling
US11162619B2 (en) 2015-05-22 2021-11-02 Sandvik Intellectual Property Ab Drill rod or adaptor with strengthened spigot coupling
US10677054B2 (en) 2015-07-31 2020-06-09 Joy Global Underground Mining Llc Cutting bit assembly
WO2020234259A1 (en) * 2019-05-23 2020-11-26 Sandvik Mining And Construction Tools Ab Drill string rod
EP3741956A1 (de) * 2019-05-23 2020-11-25 Sandvik Mining and Construction Tools AB Bohrstrangstange
EP3879065A1 (de) 2020-03-11 2021-09-15 Sandvik Mining and Construction Tools AB Elliptisches design für aussengewindeabstand
WO2021180800A1 (en) 2020-03-11 2021-09-16 Sandvik Mining And Construction Tools Ab Elliptical design for male thread clearance
EP4047178A1 (de) * 2021-02-17 2022-08-24 Sandvik Mining and Construction Tools AB Elliptisches design für sechseckige schäfte
WO2022175378A1 (en) * 2021-02-17 2022-08-25 Sandvik Mining And Construction Tools Ab Elliptical design for hexagonal shanks
WO2023144377A1 (en) 2022-01-31 2023-08-03 Sandvik Mining And Construction Tools Ab Drilling component

Also Published As

Publication number Publication date
EP2845991B1 (de) 2015-11-18
WO2015032660A1 (en) 2015-03-12

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