EP0233037A2 - Trépan de forage avec éléments rapportés amovibles - Google Patents
Trépan de forage avec éléments rapportés amovibles Download PDFInfo
- Publication number
- EP0233037A2 EP0233037A2 EP87300927A EP87300927A EP0233037A2 EP 0233037 A2 EP0233037 A2 EP 0233037A2 EP 87300927 A EP87300927 A EP 87300927A EP 87300927 A EP87300927 A EP 87300927A EP 0233037 A2 EP0233037 A2 EP 0233037A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- inserts
- drill bit
- shank
- bit
- buttons
- 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- Withdrawn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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
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
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
Definitions
- This invention relates to drill bits of the kind in which inserts of hard metal (usually cemented tungsten carbide) are provided as cutting and abrading elements on the body of the drill bit.
- hard metal usually cemented tungsten carbide
- bit body is formed as a hollow cylinder closed at one end and screwed to a shank, the closed end of the body is pierced by tapering apertures, and complementally tapered inserts are positioned in the apertures and the shank presses on the inner ends of the inserts.
- a replaceable backing plate of hard metal is preferably interposed between the shank and the inner ends of the inserts.
- a drill bit body 10 is thimble shaped and internally threaded to screw on to a complementally threaded screw shank 11.
- the threads are of the opposite hand to the intended direction of rotation of the bit so that during drilling the connection between the body and the shank tends to become tighter.
- the shank has a threaded socket 12 to screw on to a conventional drill stem.
- buttons made of cobalt cemented tungsten carbide fit into the bores 13.
- the buttons 14 taper towards domed ends.
- the shank 11 is formed with a projection 16 which fits into a hole 17 in the body 10.
- the projection 10 is bored to provide passage for flushing fluid.
- A-backing plate 18 made of cobalt cemented tungsten carbide fits over the projection 16 and serves to back up the buttons 14.
- the plate 18 is formed with steps to cater for the varying degrees that the buttons project forwardly.
- buttons 14 as well as broken backing plates 18 can be replaced in the course of drilling. There is no need to return bits to a workshop.
- Gauge buttons which protrude beyond the circumference of the body 10 can easily be indexed or rotated to compensate for wear of the buttons to thereby maintain the gauge of the hole being drilled.
- buttons were used to drill a hole with a nominal diameter of 51 mm. It was fitted with six buttons tapering at an inclusive angle of 12° to a dome base diameter of 8,1 mm. The button length was 14,5 mm.
- the bit was used to drill a series of 2 metre deep holes in a quartzite outcrop. After 51,760 m had been drilled, drilling was discontinued because the gauge of the body had worn too much and a crack had formed in the body. The average penetration rate was 0,33 m/min. Buttons were replaced when broken and sets of buttons were changed when too much wear had taken place. An average of 15,25 m was drilled per set of buttons. In this test no attempt was made to index gauge buttons.
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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Earth Drilling (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA86769 | 1986-02-03 | ||
ZA860769 | 1986-02-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0233037A2 true EP0233037A2 (fr) | 1987-08-19 |
EP0233037A3 EP0233037A3 (fr) | 1988-09-14 |
Family
ID=25578265
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87300927A Withdrawn EP0233037A3 (fr) | 1986-02-03 | 1987-02-03 | Trépan de forage avec éléments rapportés amovibles |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0233037A3 (fr) |
AU (1) | AU6822087A (fr) |
FI (1) | FI870454A (fr) |
IE (1) | IE870259L (fr) |
NO (1) | NO870356L (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130180784A1 (en) * | 2010-09-22 | 2013-07-18 | Sandvik Intellectual Property Ab | Rock drill bit and a drilling assembly for percussive rock drilling |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE249360C (fr) * | ||||
US1388490A (en) * | 1920-09-18 | 1921-08-23 | John R Suman | Rotary earth-boring drill |
US4085809A (en) * | 1977-01-10 | 1978-04-25 | Robert Lovell | Reconditionable drill bit assembly |
-
1987
- 1987-01-28 NO NO87870356A patent/NO870356L/no unknown
- 1987-02-02 AU AU68220/87A patent/AU6822087A/en not_active Abandoned
- 1987-02-02 FI FI870454A patent/FI870454A/fi not_active Application Discontinuation
- 1987-02-02 IE IE870259A patent/IE870259L/xx unknown
- 1987-02-03 EP EP87300927A patent/EP0233037A3/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE249360C (fr) * | ||||
US1388490A (en) * | 1920-09-18 | 1921-08-23 | John R Suman | Rotary earth-boring drill |
US4085809A (en) * | 1977-01-10 | 1978-04-25 | Robert Lovell | Reconditionable drill bit assembly |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130180784A1 (en) * | 2010-09-22 | 2013-07-18 | Sandvik Intellectual Property Ab | Rock drill bit and a drilling assembly for percussive rock drilling |
Also Published As
Publication number | Publication date |
---|---|
FI870454A0 (fi) | 1987-02-02 |
IE870259L (en) | 1987-08-03 |
NO870356D0 (no) | 1987-01-28 |
AU6822087A (en) | 1988-08-04 |
EP0233037A3 (fr) | 1988-09-14 |
FI870454A (fi) | 1987-08-04 |
NO870356L (no) | 1987-08-04 |
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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 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT CH DE FR GB IT LI SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT CH DE FR GB IT LI 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 |
|
18D | Application deemed to be withdrawn |
Effective date: 19890314 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SWIEGERS, RICHARD |