AU671024B2 - Thread coupling for drill string elements for percussion drilling - Google Patents
Thread coupling for drill string elements for percussion drilling Download PDFInfo
- Publication number
- AU671024B2 AU671024B2 AU66092/94A AU6609294A AU671024B2 AU 671024 B2 AU671024 B2 AU 671024B2 AU 66092/94 A AU66092/94 A AU 66092/94A AU 6609294 A AU6609294 A AU 6609294A AU 671024 B2 AU671024 B2 AU 671024B2
- Authority
- AU
- Australia
- Prior art keywords
- drill string
- free end
- formed part
- manufacturing
- stop face
- 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 19
- 238000010168 coupling process Methods 0.000 title claims description 19
- 238000005859 coupling reaction Methods 0.000 title claims description 19
- 238000005553 drilling Methods 0.000 title claims description 8
- 238000009527 percussion Methods 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000010420 art technique Methods 0.000 description 1
- 238000000034 method Methods 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)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Ropes Or Cables (AREA)
- Drilling Tools (AREA)
Description
$IE
t-/UU/U11 28/5/91 Regulation 3.2(2)
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Sa t 0 0* o'os 0 o 0 r ar 0 o a o Application Number: Lodged: 0 4 4444 0444, 044 Invention Title: THREAD COUPLING FOR DRILL STRING ELEMENTS FOR PERCUSSION DRILLING The following statement is a full description of this invention, including the best method of performing it known to us i THREAD COUPLING FOR DRILL STRING ELEMENTS FOR PERCUSSION DRILLING The present invention relates to a thread coupling for drill string elements for percussin drilling.
In a prior art tube drilling coupling, see US-A-4 968 068, it is ascertained that the spigot on one drill string element is sorvewhat shorter, 0-1 mm, than the distance between the free end and the bottom surface on the sleeve formed part on the other dril! string element. The reason for arranging this play at manufacturing is that one wishes to secure that one does not only get abutment between the outer end of the spigot and the bottom surface of the sleeve formed part. It is also said that the ideal condition is to have abutment both at the free V end and the bottom surface on the sleeve frcmed part. This condition cannot be achieved at the manufacturing because of manufacturing tolerances. It is also :said that the original bottom play between the two drill strIng elements should 15 be eliminated because of wear before 20% of the service life of the thread coupling has been used. The aim according to US-A-4 968 068 is thus to keep the original bottom play as small as possible so that one quickly achieves the double abutment between the two drill string components. This results in the drawback that the hardening of the free end of the sleeve formed part and of the cooperating stop face is little used since one soon transfers the wear to the threads of the two drill string elements.
The present invention, aims to increase the service life of the drill string elements. In one broad aspect, the present invention provides a thread coupling for drill string elements for percussion drilling comprising a first drill string element provided with a sleeve formed part having an internal thread a free end and a bottom surface and a second drill string element provided with a spigot having an external thread and extending between an outer end and a stop face characterized in that said sleeve formed part adjacent to its free end at least is hardened to a hardening depth of at least 2 mm and that the distance between said free end and said bottom surface on the sleeve formed part after manufacturing is 1.1-2.0 mm larger than the distance between said outer end and said stop R A4 L" oW P~Y Yl~EI 2 face (10) on the second drill string element after manufacturing, wherein the sleeve is capable of engaging the second drill string element such that the stop face abuts the free end.
The present invention is based on the realisation that a large hardening depth on the end of the sleeve in combination with a substantial bottom play increases the service life of the thread coupling; couplings designed according to the present invention, extend the service life through a load redistribution which substantially protects the thread from shock wave loading.
An embodiment of the invention is described below with reference to the accompanying drawing which shows a thread coupling according to the invention, partly in section.
The embodiment of the invention shown in the drawing comprises a first drill string element 1 and a second drill string element 6. The first drill string element 1 is provided with a sleeve formed part 2 having an internal thread 3, a .t 15 free end 4 and a bottom surface 5. The second drill string element 6 is provided with a spigot 7 extending between an outer end 9 and a stop face 10. The spigot 7 is provided with an external thread 8 for cooperation with the internal thread 3 on the sleeve formed part 2. The stop face 10 on the second drill string 1 element 6 and the free end 4 on the first drill string element lie in a plane perpendicular to the longitudinal axis 11 of the thread coupling. The stop face 10 and the free end 4 are intended for cooperation with each other. During i manufacturing the free end 4 and the stop face 10 are hardened, preferably through case-hardening, to a depth of at least 2 mm from the contact surface.
The sleeve formed part 2 and the spigot 7 are at manifacturing given such tolerances that the distance between the free end 4 and the bottom surface 5 on the sleeve formed part 2 is 1.1-2.0 mm, preferably 1.1-1.5 mm, larger than t, ki distance between the outer end 9 and the stop face 10 on the second drill scring element 6. This gives a bottom play A direotly after manufacturing of the above mentioned size. By giving the parts a hardening depth of at least 2 mm and by ascertaining that the bottom play A when coupling newly made drill string elements is of the above mentioned size one obtains the advantage of being able to use abutment between the free end 4 and the stop face 10 during R" 'r T IL 3 substantially longer time than what has been possible with pr jr art technique.
This results in substantially longer service life of the thread coupling than what has been possible before.
9 49 i.
I
o 0 oY* o• «I o J 0 0o
I
Claims (3)
1. Thread coupling for drill string elements for percussion drilling comprising a first drill string element provided with a sleeve formed part (2) having an internal thread a free end and a bottom surface and a second drill string element provided with a spigot having an external thread and extending between an outer end and a stop face characteri' .ad in that said sleeve formed part adjacent to its free end at least is hardened to a hardening depth of at least 2 mm and that the distance between said free end and said bottom surface on the sleeve formed part after manufacturing is 1.1-2.0 mm larger than the distance between said outer end and said stop face (10) on the second drill string element after S manufacturing, wherein the sleeve is capable of engaging the second drill string element such that the stop face abuts the free end.
2. Thread coupling according to claim 1, characterised in that the distance between said free end and said bottom surface on the sleeve formed part after manufacturing is 1.1-1.5 mm larger than the distance between said outer end and said stop face (10) on the second drill string element after manufacturing. tII C
3. Thread coupling according to claim 1 or 2, characterized in that said hardening is achieved through case-hardening. DATED this 6th day of June, 1996. UNIROC AB \NATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRALIA (DOC 07 AU6609294.WPC SKP/KWB:KP) -V "s :i :I
93002.utl Abstract: Thread coupling for drill string elements for percussion drilling. The thread coupling comprises a first drill string element provided with a sleeve formed part having an internal thread and a free end for cooperation with a second drill string element provided with a stop face (10) and a spigot with an external thread The free and the stop face (10) are hardened, during manufacturing, preferably thl .gh case-hardening, to a depth of at least 2 mm. Furthermore, the sleeve formed part and the spigot are given such dimensions during S" manufacturing that a bottom play of 1.1-2.0 mm, preferably 1.1-1.5 mm, is obtained when coupling newly made drill string elements. o i I *l i( '1 i
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9302280 | 1993-07-02 | ||
| SE9302280A SE501356C2 (en) | 1993-07-02 | 1993-07-02 | Threaded joint for drill string elements for striking drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6609294A AU6609294A (en) | 1995-01-12 |
| AU671024B2 true AU671024B2 (en) | 1996-08-08 |
Family
ID=20390491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU66092/94A Ceased AU671024B2 (en) | 1993-07-02 | 1994-06-30 | Thread coupling for drill string elements for percussion drilling |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU671024B2 (en) |
| CA (1) | CA2126027C (en) |
| SE (1) | SE501356C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE506695C2 (en) * | 1994-11-23 | 1998-02-02 | Uniroc Ab | Threaded joint for striking drilling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968068A (en) * | 1988-07-08 | 1990-11-06 | Sandvik Ab | Thread coupling for drill string members |
-
1993
- 1993-07-02 SE SE9302280A patent/SE501356C2/en not_active IP Right Cessation
-
1994
- 1994-06-16 CA CA002126027A patent/CA2126027C/en not_active Expired - Fee Related
- 1994-06-30 AU AU66092/94A patent/AU671024B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968068A (en) * | 1988-07-08 | 1990-11-06 | Sandvik Ab | Thread coupling for drill string members |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2126027A1 (en) | 1995-01-03 |
| CA2126027C (en) | 2005-11-08 |
| AU6609294A (en) | 1995-01-12 |
| SE9302280L (en) | 1995-01-03 |
| SE501356C2 (en) | 1995-01-23 |
| SE9302280D0 (en) | 1993-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU633829B2 (en) | Thread coupling | |
| US5908212A (en) | Ultra high torque double shoulder tool joint | |
| US6810956B1 (en) | Thread coupling for a drill string for percussive rock drilling | |
| WO1998058179A3 (en) | Assembly including tubular bodies mated with a compression loaded adhesive bond | |
| EP1236839A3 (en) | Reinforcing bar connection and method | |
| WO2002077136A3 (en) | Improved concrete pile made of such a concrete and method for drilling a hole adapted for receiving the improved concrete pile in a weak ground | |
| EP0016837B1 (en) | Coupling structure for water channels | |
| AU671024B2 (en) | Thread coupling for drill string elements for percussion drilling | |
| EP0943746A3 (en) | Bar anchor and method for reinforcing concrete construction | |
| CA1088338A (en) | Structural connection | |
| GB2296063A (en) | A rock bolt | |
| US5785360A (en) | Thread coupling for drill string elements for percussive drilling | |
| AU753579B2 (en) | Thread coupling for a drill string for percussive rock drilling | |
| CA2204544A1 (en) | Coupling for anchor bars | |
| CA2192204A1 (en) | Thread coupling | |
| WO2003069067A8 (en) | Expansion and/or construction joint for concrete flooring | |
| ATE272786T1 (en) | TUBING LINING FOR UNDERGROUND CYLINDRICAL STRUCTURES IN SOILS WITH LOW STABILITY | |
| RU2193988C2 (en) | Hitch mechanism | |
| USRE25485E (en) | humphrey | |
| SU1643197A1 (en) | Coupling rod of railed vehicle | |
| RU1810471C (en) | Drill pipe | |
| AU2009201053A1 (en) | Improvements in Relation to Strata Control | |
| EP0869230A3 (en) | Gutters | |
| BG101505A (en) | Bracket for drainpipe | |
| JPH09324458A (en) | Concrete cylindrical structure |