AU753579B2 - 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
- AU753579B2 AU753579B2 AU10880/00A AU1088000A AU753579B2 AU 753579 B2 AU753579 B2 AU 753579B2 AU 10880/00 A AU10880/00 A AU 10880/00A AU 1088000 A AU1088000 A AU 1088000A AU 753579 B2 AU753579 B2 AU 753579B2
- Authority
- AU
- Australia
- Prior art keywords
- thread
- drill string
- string element
- male thread
- rock drilling
- 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
- 230000008878 coupling Effects 0.000 title claims description 11
- 238000010168 coupling process Methods 0.000 title claims description 11
- 238000005859 coupling reaction Methods 0.000 title claims description 11
- 238000005553 drilling Methods 0.000 title claims description 9
- 239000011435 rock Substances 0.000 title claims description 6
- 235000009917 Crataegus X brevipes Nutrition 0.000 claims 1
- 235000013204 Crataegus X haemacarpa Nutrition 0.000 claims 1
- 235000009685 Crataegus X maligna Nutrition 0.000 claims 1
- 235000009444 Crataegus X rubrocarnea Nutrition 0.000 claims 1
- 235000009486 Crataegus bullatus Nutrition 0.000 claims 1
- 235000017181 Crataegus chrysocarpa Nutrition 0.000 claims 1
- 235000009682 Crataegus limnophila Nutrition 0.000 claims 1
- 235000004423 Crataegus monogyna Nutrition 0.000 claims 1
- 240000000171 Crataegus monogyna Species 0.000 claims 1
- 235000002313 Crataegus paludosa Nutrition 0.000 claims 1
- 235000009840 Crataegus x incaedua Nutrition 0.000 claims 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
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)
Description
1 THREAD COUPLING FOR A DRILL STRING FOR PERCUSSIVE ROCK
DRILLING
This 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 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 15 achieved by providing a thread coupling for a drill string for percussive rock drilling including a male thread and female thread cooperating therewith, said male thread being arranged on a first drill string element and said female thread being arranged on a second drill string element that said first drill string element includes a first impact surface that said second drill string element includes a 20 second impact surface and that said first and second impact surfaces during drilling are intended to abut against each other, characterized in that said male thread has a variable pitch in its axial direction and that said female thread has a thread opening which is wider than a crest of the male thread.
A preferred embodiment of the invention is described below with reference 25 to the accompanying drawings in which Figure 1 shows a drill string with a thread coupling according to the invention. Figure 2 shows a thread joint partly in section. Figure 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 drawings includes a drill bit 1, a drill rod 2 and a shank adapter 3. Instead of a dtill 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, socalled shoulder 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 Figure 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 substantially 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 oooo overloading adjacent the contact surfaces 6, 7. If one instead of shoulder 15 abutment, as shown, has bottom abutment the thread 4 has the smallest pitch near the outer end o*
Claims (1)
1. Thread coupling for a drill string for percussive rock drilling including a male thread and female thread cooperating therewith, said male thread being arranged on a first drill string element and said female thread being arranged on a second drill string element that said first drill string element includes a first impact surface that said second drill string element includes a second impact surface and that said first and second impact surfaces during drilling are intended to abut against each other, characterized in that said male thread has a variable pitch in its axial direction and that said female thread has a thread opening which is wider than a crest of the male thread. DATED this 19th day of August, 2002 UNIROC AB WATERMARK PATENT TRADE MARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRALIA P19320AU SKP/PCP P1°2AU0 °PPc ooo oooo :*AEMR AET&TAEMR TONY 29*UWODRA HATOR ICOIA32
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9803268 | 1998-09-28 | ||
| SE9803268A SE515517C2 (en) | 1998-09-28 | 1998-09-28 | String drill string thread for striking rock drilling |
| PCT/SE1999/001653 WO2000019057A1 (en) | 1998-09-28 | 1999-09-22 | Thread coupling for a drill string for percussive rock drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1088000A AU1088000A (en) | 2000-04-17 |
| AU753579B2 true AU753579B2 (en) | 2002-10-24 |
Family
ID=20412727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU10880/00A Ceased AU753579B2 (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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3095954B1 (en) | 2015-05-22 | 2024-05-15 | 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 EP EP99954561A patent/EP1117898A1/en not_active Withdrawn
- 1999-09-22 AU AU10880/00A patent/AU753579B2/en not_active Ceased
- 1999-09-22 CA CA002345707A patent/CA2345707A1/en not_active Abandoned
- 1999-09-22 ZA ZA200102511A patent/ZA200102511B/en unknown
- 1999-09-22 WO PCT/SE1999/001653 patent/WO2000019057A1/en not_active Application Discontinuation
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA200102511B (en) | 2002-03-27 |
| SE9803268D0 (en) | 1998-09-28 |
| AU1088000A (en) | 2000-04-17 |
| SE515517C2 (en) | 2001-08-20 |
| SE9803268L (en) | 2000-03-29 |
| CA2345707A1 (en) | 2000-04-06 |
| WO2000019057A1 (en) | 2000-04-06 |
| EP1117898A1 (en) | 2001-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) |