EP0931202A1 - Welded drill pipes in which the internal flash is removed and relative procedure of manufacturing - Google Patents
Welded drill pipes in which the internal flash is removed and relative procedure of manufacturingInfo
- Publication number
- EP0931202A1 EP0931202A1 EP97931974A EP97931974A EP0931202A1 EP 0931202 A1 EP0931202 A1 EP 0931202A1 EP 97931974 A EP97931974 A EP 97931974A EP 97931974 A EP97931974 A EP 97931974A EP 0931202 A1 EP0931202 A1 EP 0931202A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- welded
- cavity
- flash
- manufacturing
- fact
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000008030 elimination Effects 0.000 abstract description 6
- 238000003379 elimination reaction Methods 0.000 abstract description 6
- 230000000977 initiatory effect Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- 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
Definitions
- the present invention relates to a welded drill pipe in which the internal flash is removed, and to the relative procedure for its manufacturing.
- the external flash is easily removed with a cutting tool, whereas the elimination of the internal one is much more difficult.
- the inner flash disturbs the flow of the fluid inside the pipe and, due to its characteristic middle notch, can cause the crack initiations due to fatigue-stress in the welded joint.
- the invention and its relative manufacturing procedure solve the technical problem above mentioned as for it is characterized by the complete elimination of the flash, which fills a cavity produced in one of the two parts to be welded, for example, in the tool joint.
- all the fluid-dynamic troubles inside the pipe, caused by the inner flash are avoided as well as the crack initiations due to fatigue-stress in the welded joint.
- fig. 1 shows the modular portion of a friction welded drill pipe, manufactured according to the prior art
- • fig. 2 represents some shapes of the "flash", coming out from the friction welding process; • fig. 3 shows a first example of a friction welded joint with a cavity to be filled by the inner flash, according to the invention, placed between the pipe and male tool joint;
- fig. 4 shows a second example of a friction welded joint with a cavity to be filled by the inner flash, according to the invention, placed between the pipe and female tool joint.
- number 1 shows a modular portion of a drill pipe for civil engineering comprising a pipe 2, a male tool joint 3 and a female tool joint 4.
- Said portion 1 has been manufactured by means of friction welding between pipe and tool joints, both male and female.
- the friction welding is made by means of strong impact between the two parts to be welded; moreover, to improve the junction between them, the parts are heated to a forging temperature obtained by the rotation of one part with respect to the other.
- T e process produces a very compact and highly resistant joint and is characterized by a good repetitiveness of its phases and.
- a disadvantage of the process lies in the formation of the flash 5 ; it is a burr which comes out just during the heating phase (produced by the friction between the two parts to be welded) and takes a shape like those schematically shown in fig. 2. In particular, it is characterized by the presence of a double burr 6 which causes vortices into the fluid flow and by a middle notch 7, possible crack initiation due to fatigue-stress in the welded joint.
- the removal of the inner flash can be obtained, according to the invention, manufacturing one of the two parts to be friction welded (for example, the tool joint) as the one shown in fig. 3.
- the male tool joint 8 comprises an externally threaded portion 9, an internal shape 10, suitable to allow the proper motion of the fluid, a stop surface 11 , against which the section 20 to be welded is to be placed, a coupling surface 12 for said section and it is characterized by a cavity 13, whose volume and shape are such as to be completely filled with the inner flash produced by the welding process. Consequently the complete and perfect filling of the cavity avoids the formation of the middle notch.
- the same manufacturing, according to the invention, is depicted in fig. 4.
- the female tool joint 14 comprises an internally threaded portion 15, an internal shape 16, suitable to allow the proper motion of the fluid, a stop surface 17, against which the section 20 to be welded is to be placed, a coupling surface 18 for said section and it is characterized by a cavity 19 with the same characteristics of the cavity 13 realized in the male tool joint.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Braking Arrangements (AREA)
Abstract
Welded drill pipes for application in the civil engineering and relative procedure for the elimination of the internal flash. The pipes, manufactured by friction welding of the sections of the pipe and the tool joints, are characterized by the elimination of the internal flash (coming out from this welded joint) which fills a proper cavity. The advantages of the new product and of the process of manufacturing are the elimination of the fluid-dynamic troubles inside the pipe, caused by the inner flash, and the elimination of the crack initiations due to fatigue-stress in the welded joint.
Description
Description
Welded drill pipes in which the internal flash is removed and relative procedure of manufacturing.
Technical field
The present invention relates to a welded drill pipe in which the internal flash is removed, and to the relative procedure for its manufacturing.
Background art
In the state of the technique, drill pipes for application in civil engineering are already known. Said pipes are also manufactured by means of friction welding between the pipe sections and the tool joints, both male or female. The product obtained, as schematised in fig. 1, is a modular pipe which can be adjusted to any length. As known, the process of friction welding takes place without external weld material and without smelting the joints edges. Compared to the other known welding processes (for example, the seam welding), the friction welding assures a high mechanical resistance of the joint, its compactness and a high repetitiveness of the process phases and, consequently, its quality. The drawback of the known applications is that the friction welded joints are characterized by the formation of the "flash" inside and outside the joint, as schematised in fig. 2. The external
flash is easily removed with a cutting tool, whereas the elimination of the internal one is much more difficult. The inner flash disturbs the flow of the fluid inside the pipe and, due to its characteristic middle notch, can cause the crack initiations due to fatigue-stress in the welded joint.
Disclosure of the invention
The invention and its relative manufacturing procedure solve the technical problem above mentioned as for it is characterized by the complete elimination of the flash, which fills a cavity produced in one of the two parts to be welded, for example, in the tool joint. In this way, all the fluid-dynamic troubles inside the pipe, caused by the inner flash (pressure losses, vorticity, etc.), are avoided as well as the crack initiations due to fatigue-stress in the welded joint.
These and other advantages will be pointed out in the detailed description of the invention that refers to the figures of the table 1. All of them are examplifying and not restrictive.
Way of carrying out the invention
With reference to the above mentioned tables:
• fig. 1 shows the modular portion of a friction welded drill pipe, manufactured according to the prior art;
• fig. 2 represents some shapes of the "flash", coming out from the friction welding process;
• fig. 3 shows a first example of a friction welded joint with a cavity to be filled by the inner flash, according to the invention, placed between the pipe and male tool joint;
• fig. 4 shows a second example of a friction welded joint with a cavity to be filled by the inner flash, according to the invention, placed between the pipe and female tool joint. With reference to figure 1 , number 1 shows a modular portion of a drill pipe for civil engineering comprising a pipe 2, a male tool joint 3 and a female tool joint 4. Said portion 1 has been manufactured by means of friction welding between pipe and tool joints, both male and female. As known, the friction welding is made by means of strong impact between the two parts to be welded; moreover, to improve the junction between them, the parts are heated to a forging temperature obtained by the rotation of one part with respect to the other. T e process produces a very compact and highly resistant joint and is characterized by a good repetitiveness of its phases and. then, by an excellent quality standard. A disadvantage of the process however lies in the formation of the flash 5 ; it is a burr which comes out just during the heating phase (produced by the friction between the two parts to be welded) and takes a shape like those schematically shown in fig. 2. In particular, it is characterized by the presence of a double burr 6 which causes vortices into the fluid flow and by a middle notch 7, possible crack initiation due to fatigue-stress in the
welded joint. The removal of the inner flash can be obtained, according to the invention, manufacturing one of the two parts to be friction welded (for example, the tool joint) as the one shown in fig. 3. In said picture, the male tool joint 8 comprises an externally threaded portion 9, an internal shape 10, suitable to allow the proper motion of the fluid, a stop surface 11 , against which the section 20 to be welded is to be placed, a coupling surface 12 for said section and it is characterized by a cavity 13, whose volume and shape are such as to be completely filled with the inner flash produced by the welding process. Consequently the complete and perfect filling of the cavity avoids the formation of the middle notch.
The same manufacturing, according to the invention, is depicted in fig. 4. In said picture the joint between the section 20 and the female tool joint 14 is shown. The female tool joint 14 comprises an internally threaded portion 15, an internal shape 16, suitable to allow the proper motion of the fluid, a stop surface 17, against which the section 20 to be welded is to be placed, a coupling surface 18 for said section and it is characterized by a cavity 19 with the same characteristics of the cavity 13 realized in the male tool joint.
Claims
Claims
1 ) Welded drill pipe in which the internal flash is removed, which comprises modular parts manufactured by friction welding of the sections of the pipe 20 and tool joints (8, 14) ; characterized by the fact that at least one of the two parts to be welded together contains a cavity (13, 19), whose volume and shape are such as to be completely filled with the inner flash. 2) Welded drill pipe according to the claim 1 , characterized by the fact that said cavity 13 is obtained in the male tool joint 8.
3) Welded drill pipe according to the claim 1 , characterized by the fact that said cavity 19 is obtained in the female tool joint 14.
4) Welded drill pipe according to the claim 1 , characterized by the fact that said cavities ( 13, 19) are obtained in both tool joints (8, 14).
5) Male tool joint according lo the claim 1 , characterized by a stop surface 1 1, against which the section 20 to be welded is to be placed, a coupling surface 12 for said section and said cavity 13.
6) Female tool joint according to the claim 1 , characterized by a stop surface 17, against which the section 20 to be welded is
to be placed, a coupling surface 18 for said section and said cavity 19. 7) Procedure of manufacturing of drill pipes by friction welding characterized by the fact that at least one of the two parts to be welded contains (between the stop surface (11, 17) and the coupling surface (12, 18) of the other part) a cavity (13, 19), able to be filled with the inner flash coming out from the heating of the two parts to be welded during the friction welding process.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBA960041 | 1996-09-26 | ||
IT96BA000041A IT1287029B1 (en) | 1996-09-26 | 1996-09-26 | FRICTIONAL DRILLING RODS WITH INTERNAL FLASH STORAGE AND RELATED MANUFACTURING PROCEDURE |
PCT/IB1997/000949 WO1998013574A1 (en) | 1996-09-26 | 1997-07-28 | Welded drill pipes in which the internal flash is removed and relative procedure of manufacturing |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0931202A1 true EP0931202A1 (en) | 1999-07-28 |
Family
ID=11335739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97931974A Withdrawn EP0931202A1 (en) | 1996-09-26 | 1997-07-28 | Welded drill pipes in which the internal flash is removed and relative procedure of manufacturing |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0931202A1 (en) |
AU (1) | AU3555197A (en) |
IT (1) | IT1287029B1 (en) |
WO (1) | WO1998013574A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106312440A (en) * | 2015-06-24 | 2017-01-11 | 钱立群 | Friction welding repair method for hollow steel drill rod |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19917071C2 (en) * | 1999-04-15 | 2001-04-26 | Slv Muenchen Gmbh | Friction welding process |
DE10031416A1 (en) * | 2000-06-28 | 2002-01-10 | Hilti Ag | Friction welding pipe connection and friction-welded rock drilling tool with drilling fluid channel |
WO2007134477A1 (en) * | 2006-05-24 | 2007-11-29 | Mathias Broder | Connector for drill pipes, and drill pipe equipped with a connector |
ITUD20110163A1 (en) * | 2011-10-14 | 2013-04-15 | Scaglia Spa | DRILLING AUCTION |
CN105143593B (en) | 2013-04-22 | 2018-04-06 | 福伊特专利有限公司 | Metal tube with connector |
DE102013208458A1 (en) | 2013-05-08 | 2014-11-13 | Voith Patent Gmbh | Metal pipe with connector |
CN109899004A (en) * | 2019-03-12 | 2019-06-18 | 淮北林光钻探机电工程有限公司 | A kind of exploration casing and its manufacturing method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0138603A3 (en) * | 1983-10-13 | 1986-04-23 | Texas Forge & Tool Limited | Improvements in or relating to rods and pipes |
US4817852A (en) * | 1987-10-08 | 1989-04-04 | T. H. Industries | Method of replacing drill bit heads |
US5154340A (en) * | 1991-07-02 | 1992-10-13 | Peacock Harold B | Method and device for frictional welding |
DE4344561C2 (en) * | 1993-12-24 | 1995-11-30 | Daimler Benz Ag | Method and device for friction welding of cylindrical parts to be joined |
-
1996
- 1996-09-26 IT IT96BA000041A patent/IT1287029B1/en active IP Right Grant
-
1997
- 1997-07-28 EP EP97931974A patent/EP0931202A1/en not_active Withdrawn
- 1997-07-28 AU AU35551/97A patent/AU3555197A/en not_active Abandoned
- 1997-07-28 WO PCT/IB1997/000949 patent/WO1998013574A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9813574A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106312440A (en) * | 2015-06-24 | 2017-01-11 | 钱立群 | Friction welding repair method for hollow steel drill rod |
Also Published As
Publication number | Publication date |
---|---|
IT1287029B1 (en) | 1998-07-30 |
ITBA960041A1 (en) | 1998-03-26 |
WO1998013574A1 (en) | 1998-04-02 |
ITBA960041A0 (en) | 1996-09-26 |
AU3555197A (en) | 1998-04-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19990324 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19991201 |