WO1997026437A1 - Assemblage par vissage - Google Patents

Assemblage par vissage Download PDF

Info

Publication number
WO1997026437A1
WO1997026437A1 PCT/IB1997/000127 IB9700127W WO9726437A1 WO 1997026437 A1 WO1997026437 A1 WO 1997026437A1 IB 9700127 W IB9700127 W IB 9700127W WO 9726437 A1 WO9726437 A1 WO 9726437A1
Authority
WO
WIPO (PCT)
Prior art keywords
threaded
rod
joint
drill
tube
Prior art date
Application number
PCT/IB1997/000127
Other languages
English (en)
Inventor
John O'brien
Nigel Roberts
Derek Loughlin
Mark Kilfoil
Original Assignee
Boart Longyear Limited
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 Boart Longyear Limited filed Critical Boart Longyear Limited
Priority to AU15546/97A priority Critical patent/AU1554697A/en
Publication of WO1997026437A1 publication Critical patent/WO1997026437A1/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

  • This invention relates to a threaded joint for coupling together two drill rods as part of the drill string of a rock drill which provides both rotary and percussive drilling forces to a drill bit.
  • US Patent Specification 4 687 368 discloses a typical male/female drill rod joint for a rock drill.
  • the female part of the joint is a socket with a shoulder at the bottom, and the male part of the joint ends in an end face at right angles to the rod axis.
  • US Invention Registration H1329 describes a threaded coupling for a drill used in oil well drilling, as opposed to rock drilling. This thread is a tapered thread, as opposed to the parallel thread of the present invention.
  • a threaded joint for joining two drill tubes, the joint comprising a female threaded part at one end of a first drill tube and a male threaded part at one end of a second drill tube, wherein the threads lie parallel to the axis of the joint, the female threads are formed in a bore of the first tube which has a tapered transition leading from the threaded part into the tube internal bore, the taper angle (as measured between the tapered surface and the drill rod axis) being 45° or less, the end of the first drill tube having an annular surface normal to the rod axis, and wherein the male threaded part has a shoulder between the male threads and the remainder of the second rod, the shoulder being adapted to abut the annular surface on the other rod, when the rods are coupled together.
  • the female threaded part (and possibly the male threaded part) can be produced separately from a rod which forms the major part of each drill tube.
  • Either threaded part may be machined from either a solid blank or a tubular blank and subsequently joined to the rod, for example by friction welding.
  • the threaded parts can alternatively be machined directly from the material of a rod.
  • the joint is preferably a joint for tube drilling rods, and in this case the external diameters of the first and second rods (and indeed of any other rods coupled into the string) will be constant over their length, with the pitch diameter of the threaded parts being less than the external diameter of the rods .
  • the taper angle of the tapered transition in the female threaded part is preferably less than 30°, and in a particularly preferred embodiment is about 10°.
  • Figure 1 is an exploded view of part of a tube drilling string, with threaded joints shown uncoupled;
  • Figure 2 shows, in cross-section, the flushing flows occurring during tube drilling
  • Figure 3 shows a tube drill at the bottom of a drilled hole
  • Figure 4 is a section through the end of a first rod, with a female thread
  • Figure 5 is a side view of the end of a second rod, showing a male threaded end
  • Figure 6 is a view showing the ends of the first and second rods coupled together.
  • Figure 7 is a cross-section through the coupled first and second rods .
  • Figure 1 shows two tube drilling rods 10 together with a button bit 12.
  • these components will be coupled together by threaded couplings 14 to form a drill string which will be driven into a rock face by a conventional top hammer mechanism imparting both rotary and percussive forces to the drill bit.
  • the threads in the couplings lie parallel to the tube axis. As the depth of the hole increases, further tube rods 10 will be added at the top end of the string.
  • the pitch circle of the threaded couplings 14 is of smaller diameter than the external diameter of the rods themselves.
  • the coupled drill string has a smooth external surface, as can be seen in Figures 2 and 3. This allows a minimising of the annular gap 16 between the rod 10 and the hole wall 18, and a corresponding maximising of the up-hole flushing fluid velocity, as illustrated in Figure 2. This results in very efficient flushing to remove rock chips from the hole.
  • Figure 4 shows one end 20 of a tube rod with an internal, female thread form generally designated 22.
  • the tube rod has a bore 24 extending the entire length of the rod and open at both ends. The diameter of this bore at the male threaded end will be slightly smaller than the bore diameter at the female threaded end.
  • the end 20 has an entry taper 26, a parallel walled portion 30 where the thread 22 is formed, and a tapered transition region 28 where the thread 22 stops and the bore 24 meets the end portion. It will be seen that the tube wall 32 is slightly thicker in the middle region of the tube, where the wall bounds the bore 24, than it is in the end region where the thread 22 is formed.
  • Figure 5 shows one end 34 of a tube rod with a male thread 36 formed on a projection 37 at the tube end.
  • This rod also has an internal bore, indicated by dotted lines at 38.
  • the projection 37 has a tapered leading portion 40 and ends in a shoulder 42.
  • each rod 10 will have one end 20 with a female thread and one end 34 with a male thread.
  • the external diameter of the rod 20 and of the rod 34 will be the same.
  • the rod ends can be coupled together to form a joint as shown in Figures 6 and 7.
  • the open end of the rod 20 will butt up against the shoulder 42 of the rod 34, and when drilling takes place, force will be transmitted from one rod to the other across these surfaces.
  • the pitch circle of the thread (indicated at 44) small, the contact area between the two abutting surfaces (the struck faces) can be maximised, to improve force transmission, to improve rigidity of the joint and to enhance the service life of the rods.
  • the pitch circle diameter (of the joint) as the diameter which is half way between the root diameter of the female thread and the root diameter of the male thread.
  • the pitch circle diameter of the joint will therefore be slightly larger than the pitch circle diameter of the male thread form and slightly smaller than the pitch circle diameter of the female thread form.
  • the angle of taper in the transition region 28 can be between 15° and 40° (inclusive angle) and the taper in the female lead in region 26 can also be between 15° and 40°.

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 l'assemblage par vissage de deux tiges de forage (10). Selon l'invention, la première tige de forage présente, à une extrémité, une partie filetée femelle (22) et la seconde tige de forage présente, à une extrémité, une partie filetée mâle (36). Le filetage de la partie femelle (22) est réalisée dans un alésage de la première tige de forage qui présente une zone de transition (28) se rétrécissant, allant de la partie filetée jusqu'à l'intérieur de l'alésage interne (24) de la tige. L'angle de rétrécissement de cette zone de transition (mesuré entre la surface de la partie rétrécie et l'axe de la tige) est de 45° maximum. L'extrémité de la première tige de forage présente une surface annulaire (41) perpendiculaire à l'axe de la tige, et la partie filetée femelle comporte un épaulement (42) qui se trouve entre son filetage et sa partie restante. Cet épaulement (42) est conçu pour venir en butée contre la surface annulaire de l'autre tige, lors de l'accouplement des deux tiges.
PCT/IB1997/000127 1996-01-20 1997-01-20 Assemblage par vissage WO1997026437A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15546/97A AU1554697A (en) 1996-01-20 1997-01-20 Threaded joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9601179.6 1996-01-20
GB9601179A GB2309276A (en) 1996-01-20 1996-01-20 Threaded joint

Publications (1)

Publication Number Publication Date
WO1997026437A1 true WO1997026437A1 (fr) 1997-07-24

Family

ID=10787323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/000127 WO1997026437A1 (fr) 1996-01-20 1997-01-20 Assemblage par vissage

Country Status (3)

Country Link
AU (1) AU1554697A (fr)
GB (1) GB2309276A (fr)
WO (1) WO1997026437A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000019057A1 (fr) * 1998-09-28 2000-04-06 Uniroc Ab Train de tiges a raccords filetes pour perçage a percussion dans la roche

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2242592A1 (fr) * 1997-07-11 1999-01-11 William D. Murray Entrees de filetage multiples pour des utilisations necessitant la transmission de couple eleve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044778A2 (fr) * 1980-07-17 1982-01-27 VALLOUREC Société Anonyme dite. Joint pour tubes destinés notamment à l'industrie pétrolière
US4373754A (en) * 1978-08-09 1983-02-15 Hydril Company Threaded connector
EP0145154A1 (fr) * 1983-10-05 1985-06-19 Texas Forge & Tool Limited Tiges
WO1986001252A1 (fr) * 1984-08-13 1986-02-27 Hydril Company Raccord de tubes de puits
US4594020A (en) * 1982-08-13 1986-06-10 Mega Industrial Products, Inc. Welded oil well pump rod
EP0354887A1 (fr) * 1988-07-08 1990-02-14 Sandvik Aktiebolag Méthode d'obtention d'un accouplement fileté

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB758333A (en) * 1954-12-29 1956-10-03 Reed Roller Bit Co Improvements in drill-pipe joints
GB1133741A (en) * 1966-01-18 1968-11-13 Becker Drilling Alberta Ltd Improvements in and relating to drilling of earth formations
US3388752A (en) * 1966-07-25 1968-06-18 Ventura Tool Company Combination piledriver and drivable threaded pipe sections
GB2064041B (en) * 1979-11-19 1983-07-27 Hunting Oilfield Services Ltd Pipe connectors
SE8203247L (sv) * 1982-05-25 1983-11-26 Jagelid Kjell Inge Gunnar Sammanforenande forband vid ror for borrningsendamal
US4676528A (en) * 1984-04-30 1987-06-30 Gray Theodor R Method and apparatus for restoring tubular upsets
USH1329H (en) * 1992-04-28 1994-07-05 Exxon Production Research Company Drill collar connections

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373754A (en) * 1978-08-09 1983-02-15 Hydril Company Threaded connector
EP0044778A2 (fr) * 1980-07-17 1982-01-27 VALLOUREC Société Anonyme dite. Joint pour tubes destinés notamment à l'industrie pétrolière
US4594020A (en) * 1982-08-13 1986-06-10 Mega Industrial Products, Inc. Welded oil well pump rod
EP0145154A1 (fr) * 1983-10-05 1985-06-19 Texas Forge & Tool Limited Tiges
WO1986001252A1 (fr) * 1984-08-13 1986-02-27 Hydril Company Raccord de tubes de puits
EP0354887A1 (fr) * 1988-07-08 1990-02-14 Sandvik Aktiebolag Méthode d'obtention d'un accouplement fileté

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000019057A1 (fr) * 1998-09-28 2000-04-06 Uniroc Ab Train de tiges a raccords filetes pour perçage a percussion dans la roche
AU753579B2 (en) * 1998-09-28 2002-10-24 Uniroc Ab Thread coupling for a drill string for percussive rock drilling

Also Published As

Publication number Publication date
GB2309276A (en) 1997-07-23
GB9601179D0 (en) 1996-03-20
AU1554697A (en) 1997-08-11

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