WO2000019057A1 - Thread coupling for a drill string for percussive rock drilling - Google Patents
Thread coupling for a drill string for percussive rock drilling Download PDFInfo
- Publication number
- WO2000019057A1 WO2000019057A1 PCT/SE1999/001653 SE9901653W WO0019057A1 WO 2000019057 A1 WO2000019057 A1 WO 2000019057A1 SE 9901653 W SE9901653 W SE 9901653W WO 0019057 A1 WO0019057 A1 WO 0019057A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thread
- drill string
- rock drilling
- male
- male 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.)
- Ceased
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 thread coupling for a drill string for percussive rock drilling.
- the present invention which is defined in the subsequent claim, aims at achieving a thread coupling where the above mentioned load increase near the contact surface between the two drill string elements is avoided. Through this one can increase the drill rate without deteriorating the service life compared to previously known equipment. This is achieved through having a male thread with variable pitch and a female thread with a thread opening which is wider than the crest of the male thread.
- fig 1 shows a drill string with a thread coupling according to the invention.
- Fig 2 shows a thread joint partly in section.
- Fig 3 shows a part of the thread joint on a larger scale with exaggerated variation of the thread pitch.
- the drill string shown in the drawing comprises a drill bit 1, a drill rod 2 and a shank adapter 3.
- Drill bit, drill rod and shank adapter are drill string elements.
- a first drill string element 3 is provided with a male thread 4 and a first impact surface 6.
- a second drill string element 2 is provided with a female thread 5 and a second impact surface 7.
- the impact surfaces 6,7 abut against each other during drilling.
- the abutment is situated at the outer end of drill string element 2, so-called soulder abutment.
- the male thread 4 has an axially varying thread pitch. Furthermore the female thread 5 has a thread opening which is wider than the crest 9 of the male thread 4. The female thread has substaantially constant pitch. Through these features the thread coupling can be tightened in spite of the threads not having the same pitch. If e.g. the female thread has a pitch of 15 mm the male thread can have a pitch which is 15+(x/15)*0.2 mm where x is a running coordinate in the longitudinal direction of the thread. In the shown example the pitch of the thread is largest near the outer end 10 of the thread 4. This means that the thread coupling is prestressed near the outer end 10 so that one avoids overloading adjacent the contact surfaces 6,7. If one instead of shoulder abutment, as shown, has bottom abutment the thread 4 has the smallest pitch near the outer end 10.
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
The thread coupling is provided with a male thread (4) and a female thread (5) cooperating therewith. The male thread is arranged on a first drill string element (3) provided with a first impact surface (6). The female thread is arranged on a second drill string element (2) which is provided with a second impact surface (7). The male thread (4) has an axially variable pitch. And the female thread (5) has a thread opening (8) which is wider than the crest (9) of the male thread.
Description
Thread coupling for a drill string for percussive rock drilling
The present invention relates to a thread coupling for a drill string for percussive rock drilling.
In previously known thread couplings for percussive rock drilling prestressing of the drill string elements at the contact surface between them is obtained. The increased load depends on a combination of the material deformations, which are obtained when a shock wave passes through the thread coupling, and the applied torque. The increased load increases the risk for breakage in either or both of the connected drill string elements.
The present invention, which is defined in the subsequent claim, aims at achieving a thread coupling where the above mentioned load increase near the contact surface between the two drill string elements is avoided. Through this one can increase the drill rate without deteriorating the service life compared to previously known equipment. This is achieved through having a male thread with variable pitch and a female thread with a thread opening which is wider than the crest of the male thread.
An embodiment of the invention is described below with reference to the accompanying drawing in which fig 1 shows a drill string with a thread coupling according to the invention. Fig 2 shows a thread joint partly in section. Fig 3 shows a part of the thread joint on a larger scale with exaggerated variation of the thread pitch.
The drill string shown in the drawing comprises a drill bit 1, a drill rod 2 and a shank adapter 3. Instead of a drill rod as shown one can have several. Drill bit, drill rod and shank adapter are drill string elements. A first drill string element 3 is provided with a male thread 4 and a first impact surface 6. A second drill string element 2 is provided with a female thread 5 and a second impact surface 7. The impact surfaces 6,7 abut against each other during drilling. In the shown example the abutment is situated at the outer end of drill string element 2, so-called soulder abutment. One can of course have the abutment at the outer end of drill string element 3 instead, so-called bottom abutment. As is best shown in fig 3 the male thread 4 has an axially varying thread pitch. Furthermore the female thread 5
has a thread opening which is wider than the crest 9 of the male thread 4. The female thread has substaantially constant pitch. Through these features the thread coupling can be tightened in spite of the threads not having the same pitch. If e.g. the female thread has a pitch of 15 mm the male thread can have a pitch which is 15+(x/15)*0.2 mm where x is a running coordinate in the longitudinal direction of the thread. In the shown example the pitch of the thread is largest near the outer end 10 of the thread 4. This means that the thread coupling is prestressed near the outer end 10 so that one avoids overloading adjacent the contact surfaces 6,7. If one instead of shoulder abutment, as shown, has bottom abutment the thread 4 has the smallest pitch near the outer end 10.
Claims
1. Thread coupling for a drill string for percussive rock drilling comprising a male thread (4) and female thread (5) cooperating therewith, said male thread (4) being arranged on a first drill string element (3) and said female thread (5) being arranged on a second drill string element (2), that said first drill string element (3) comprises a first impact surface (6), that said second drill string element (2) comprises a second impact surface (7) and that said first and second impact surfaces during drilling are intended to abut against each other, c h a r a c t e r i z e d in that said male thread (4) has a variable pitch in its axial direction and that said female thread (5) has a thread opening (8) which is wider than the crest (9) of the male thread (4).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99954561A EP1117898A1 (en) | 1998-09-28 | 1999-09-22 | Thread coupling for a drill string for percussive rock drilling |
| AU10880/00A AU753579B2 (en) | 1998-09-28 | 1999-09-22 | Thread coupling for a drill string for percussive rock drilling |
| CA002345707A CA2345707A1 (en) | 1998-09-28 | 1999-09-22 | Thread coupling for a drill string for percussive rock drilling |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9803268A SE515517C2 (en) | 1998-09-28 | 1998-09-28 | String drill string thread for striking rock drilling |
| SE9803268-3 | 1998-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000019057A1 true WO2000019057A1 (en) | 2000-04-06 |
Family
ID=20412727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1999/001653 Ceased WO2000019057A1 (en) | 1998-09-28 | 1999-09-22 | Thread coupling for a drill string for percussive rock drilling |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1117898A1 (en) |
| AU (1) | AU753579B2 (en) |
| CA (1) | CA2345707A1 (en) |
| SE (1) | SE515517C2 (en) |
| WO (1) | WO2000019057A1 (en) |
| ZA (1) | ZA200102511B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2302506C2 (en) * | 2002-06-27 | 2007-07-10 | Сандвик Интеллекчуал Проперти Аб | Male drill rod section, drill bit and threaded connection between male drill rod section and drill bit for percussion rock drilling |
| EP3298229B1 (en) | 2015-05-22 | 2020-10-14 | Sandvik Intellectual Property AB | Drill rod or adaptor with strengthened spigot coupling |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4582348A (en) * | 1983-08-31 | 1986-04-15 | Hunting Oilfield Services (Uk) Limited | Pipe connector with varied thread pitch |
| WO1997026437A1 (en) * | 1996-01-20 | 1997-07-24 | Boart Longyear Limited | Threaded joint |
-
1998
- 1998-09-28 SE SE9803268A patent/SE515517C2/en not_active IP Right Cessation
-
1999
- 1999-09-22 AU AU10880/00A patent/AU753579B2/en not_active Ceased
- 1999-09-22 WO PCT/SE1999/001653 patent/WO2000019057A1/en not_active Ceased
- 1999-09-22 ZA ZA200102511A patent/ZA200102511B/en unknown
- 1999-09-22 CA CA002345707A patent/CA2345707A1/en not_active Abandoned
- 1999-09-22 EP EP99954561A patent/EP1117898A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4582348A (en) * | 1983-08-31 | 1986-04-15 | Hunting Oilfield Services (Uk) Limited | Pipe connector with varied thread pitch |
| WO1997026437A1 (en) * | 1996-01-20 | 1997-07-24 | Boart Longyear Limited | Threaded joint |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2302506C2 (en) * | 2002-06-27 | 2007-07-10 | Сандвик Интеллекчуал Проперти Аб | Male drill rod section, drill bit and threaded connection between male drill rod section and drill bit for percussion rock drilling |
| EP3298229B1 (en) | 2015-05-22 | 2020-10-14 | Sandvik Intellectual Property AB | Drill rod or adaptor with strengthened spigot coupling |
| EP3095954B1 (en) | 2015-05-22 | 2024-05-15 | Sandvik Intellectual Property AB | Drill rod or adaptor with strengthened spigot coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1117898A1 (en) | 2001-07-25 |
| SE9803268D0 (en) | 1998-09-28 |
| AU753579B2 (en) | 2002-10-24 |
| ZA200102511B (en) | 2002-03-27 |
| CA2345707A1 (en) | 2000-04-06 |
| AU1088000A (en) | 2000-04-17 |
| SE9803268L (en) | 2000-03-29 |
| SE515517C2 (en) | 2001-08-20 |
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