EP1597454A1 - Tool - Google Patents
ToolInfo
- Publication number
- EP1597454A1 EP1597454A1 EP04712263A EP04712263A EP1597454A1 EP 1597454 A1 EP1597454 A1 EP 1597454A1 EP 04712263 A EP04712263 A EP 04712263A EP 04712263 A EP04712263 A EP 04712263A EP 1597454 A1 EP1597454 A1 EP 1597454A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- male portion
- layer
- portion according
- steel
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 230000003628 erosive effect Effects 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 230000035939 shock Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000009713 electroplating Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000007751 thermal spraying Methods 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 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
Definitions
- the present invention relates to a male portion for percussive drilling according to the preamble of the appended independent claim.
- a gap is formed between co-operating shoulders of the tubes or rods included in the drill string after each shock wave. Water is collected on the surface of the shoulder between each shock wave so that each impact provides a jet stream of water away from the impact surface. The part of the jet stream that then travels radially inwards will give rise to damage on associated male portion, see Figs. 1A and 1 B, and finally the male portion will break so that the drilling cannot be continued.
- a male portion is shown where a threaded portion has been provided with a metallic material, which is more precious than the steel in the male portion. Thereby, it is intended to solve the problem of corrosion fatigue in the threads by coating at least the parts of the thread of the male portion that co-operate with other parts of the threaded joint.
- An object of the present invention is to substantially decrease the damage on a male portion for percussive rock drilling.
- Another object of the present invention is to substantially improve the resistance to erosion corrosion in sections having a reduced cross-section in a male portion for percussive rock drilling.
- Fig. 1A shows a conventional male portion after erosion corrosion.
- Fig. 1 B shows a cross-section of a threaded joint having the conventional male portion.
- Fig. 2A shows a shows a threaded joint having a male portion according to the present invention in longitudinal cross-section.
- Fig. 2B shows an enlarged cross-section of the male portion according to the present invention.
- Fig. 2C shows a cross-section of the male portion according to the present invention.
- the threaded joint shown in Figs. 2A and 2B for percussive drilling comprises a sleeve-shaped portion or a female portion 11 having a cylindrical female thread or cylindrical internal thread 12 in co-operation with a pin or male portion 13 according to the present invention provided with a cylindrical male thread or cylindrical external thread 14.
- the male portion 13 and the female portion 11 constitute integrated parts of identical drill elements or drill tubes 10A, 10B.
- the shown thread is a so-called trapezoidal thread but other thread shapes may be possible, e.g. a rope thread.
- the male portion has a through flush channel 15, through which a flush medium, usually air or water, is led.
- the threads 12, 14 comprise thread flanks and thread roots arranged between the flanks.
- the male thread 14 is terminated, in the direction of the other end of the tube, in a clearance surface 16.
- the clearance surface 16 connects via a con- cave portion 17 to a shoulder 18, which is substantially perpendicular to the centre line CL of the threaded joint.
- the shoulder 18 connects in turn to the envelope surface of the tube 10A.
- the concave portion 17 is preferably softly rounded, such as via a radius.
- the female portion 11 has an end surface 19 arranged on the free end thereof, which is substantially perpendicular to the centre line CL of the threaded joint.
- the end surface 19 and the shoulder 18 abuts against each other.
- the part of the jet stream that travels radially inwards has an angle of action of about 90° and when it meets the surface in the concave portion, a protective layer of oxide on the surface is broken.
- the exposed pure metal surface then oxidizes (corrodes) again before the oxide thereof again is torn away. This course of events gives rise to accelerated so- called erosion corrosion.
- the concave portion 17 of the male portion is provided with a coating consisting of at least one surface-modifying, erosion-protecting layer 20.
- the layer is continuous in the direction of circumference. The layer follows the curvature in the portion 17.
- the maximum thickness of layer is 0,002-5 mm, preferably 0,02-2 mm.
- the layer 20 is more resistant to erosion corrosion than the supporting or subjacent steel. Examples of such erosion corrosion-resistant materials are nickel, chromium, copper, tin, cobalt and titanium as well as alloys of these, preferably erosion- resistant steels or Co or Ni base alloys. Additional layers may be made in order to increase the binding between coating and steel.
- the material in the layer 20 has at least 50 mV higher electrode potential than the steel, preferably at least 100 mV, most preferably at least 250 mV higher electrode potential than the steel.
- a number of different surface-coating methods may be used in order to apply the layer, e.g. chemical or electrolytic plating, thermal spraying or tool-tipping, preferably tool-tipping by means of laser.
- the invention relates to a male portion for percussive drilling having a concave portion, which is coated with a protective layer in order to substantially improve the resistance to erosion of a low-alloy steel body.
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
According to the present invention, there is a male portion for percussive drilling comprising an external thread (14). The male portion (13) constitutes an integrated part of a drill element (10A). The male portion has a through flush channel (15) for a flush medium. The external thread (14) comprises thread flanks adapted for percussive drilling. The thread is terminated in a clearance surface (16). The clearance surface (16) connects via a concave portion (17) to a shoulder (18). The shoulder is intended to transfer shock waves. The concave portion (17) of the male portion is provided with a coating consisting of at least one erosion corrosion-protecting layer (20).
Description
TOOL
Background of the Invention
The present invention relates to a male portion for percussive drilling according to the preamble of the appended independent claim.
Upon drilling with a drill string connected to a top hammer, a gap is formed between co-operating shoulders of the tubes or rods included in the drill string after each shock wave. Water is collected on the surface of the shoulder between each shock wave so that each impact provides a jet stream of water away from the impact surface. The part of the jet stream that then travels radially inwards will give rise to damage on associated male portion, see Figs. 1A and 1 B, and finally the male portion will break so that the drilling cannot be continued.
In US-A-6,334,493, a male portion is shown where a threaded portion has been provided with a metallic material, which is more precious than the steel in the male portion. Thereby, it is intended to solve the problem of corrosion fatigue in the threads by coating at least the parts of the thread of the male portion that co-operate with other parts of the threaded joint.
Objects of the Invention
An object of the present invention is to substantially decrease the damage on a male portion for percussive rock drilling.
Another object of the present invention is to substantially improve the resistance to erosion corrosion in sections having a reduced cross-section in a male portion for percussive rock drilling.
Brief Description of the Drawings
These and other objects have been attained by a male portion that has received the features according to the characterizing clause of the appended independent claim, reference being made to the drawings. Fig. 1A shows a conventional male portion after erosion corrosion. Fig. 1 B shows a cross-section of a threaded joint having the conventional male portion. Fig. 2A shows a
shows a threaded joint having a male portion according to the present invention in longitudinal cross-section. Fig. 2B shows an enlarged cross-section of the male portion according to the present invention. Fig. 2C shows a cross-section of the male portion according to the present invention.
Detailed Description of the Invention
The threaded joint shown in Figs. 2A and 2B for percussive drilling comprises a sleeve-shaped portion or a female portion 11 having a cylindrical female thread or cylindrical internal thread 12 in co-operation with a pin or male portion 13 according to the present invention provided with a cylindrical male thread or cylindrical external thread 14. The male portion 13 and the female portion 11 constitute integrated parts of identical drill elements or drill tubes 10A, 10B. The shown thread is a so-called trapezoidal thread but other thread shapes may be possible, e.g. a rope thread. Furthermore, the male portion has a through flush channel 15, through which a flush medium, usually air or water, is led. The threads 12, 14 comprise thread flanks and thread roots arranged between the flanks.
The male thread 14 is terminated, in the direction of the other end of the tube, in a clearance surface 16. The clearance surface 16 connects via a con- cave portion 17 to a shoulder 18, which is substantially perpendicular to the centre line CL of the threaded joint. The shoulder 18 connects in turn to the envelope surface of the tube 10A. The concave portion 17 is preferably softly rounded, such as via a radius.
The female portion 11 has an end surface 19 arranged on the free end thereof, which is substantially perpendicular to the centre line CL of the threaded joint. When the joint is tightened according to Fig. 2A, the end surface 19 and the shoulder 18 abuts against each other. During drilling, the water that is deposited on the surfaces 18 and 19 will provide a jet stream of water in a direction shown by the arrow in Fig. 1 B. The part of the jet stream that travels radially inwards has an angle of action of about 90° and when it meets the surface in the concave portion, a protective layer of oxide on the surface is broken. The exposed pure metal surface then oxidizes (corrodes) again before the oxide
thereof again is torn away. This course of events gives rise to accelerated so- called erosion corrosion.
The joint is also shown in US-A-4,968,068, which patent hereby is incorporated in the present description, where there are shoulder and/or bottom abut- ment between the tubes 10A, 10B.
According to the present invention, the concave portion 17 of the male portion is provided with a coating consisting of at least one surface-modifying, erosion-protecting layer 20. The layer is continuous in the direction of circumference. The layer follows the curvature in the portion 17. The maximum thickness of layer is 0,002-5 mm, preferably 0,02-2 mm. A plane P, which coincides with the shoulder 18, substantially touches or intersects the layer 20. The layer 20 is more resistant to erosion corrosion than the supporting or subjacent steel. Examples of such erosion corrosion-resistant materials are nickel, chromium, copper, tin, cobalt and titanium as well as alloys of these, preferably erosion- resistant steels or Co or Ni base alloys. Additional layers may be made in order to increase the binding between coating and steel. The material in the layer 20 has at least 50 mV higher electrode potential than the steel, preferably at least 100 mV, most preferably at least 250 mV higher electrode potential than the steel. A number of different surface-coating methods may be used in order to apply the layer, e.g. chemical or electrolytic plating, thermal spraying or tool-tipping, preferably tool-tipping by means of laser.
Thus, the invention relates to a male portion for percussive drilling having a concave portion, which is coated with a protective layer in order to substantially improve the resistance to erosion of a low-alloy steel body.
Claims
1. A male portion for percussive drilling comprising an external thread (14), the male portion (13) constituting an integrated part of a drill element (10A), the male portion having a through flush channel (15) for a flush medium, the external thread (14) comprising thread flanks adapted for percussive drilling, the thread being terminated in a clearance surface (16), the clearance surface (16) connecting via a concave portion (17) to a shoulder (18), the shoulder being intended to transfer shock waves, characterized in that at least one part of the concave portion (17) of the male portion is provided with a coating consisting of at least one erosion corrosion-protecting layer (20).
2. The male portion according to claim ^characterized in that the layer is continuous in the circumferential direction of the male portion.
3. The male portion according to claim 1 or 2, characterized in that the maximum thickness of layer is 0,002-5 mm, preferably 0,02-2 mm.
4. The male portion according to any one of the preceding claims, charac- t e r i z e d in that the layer (20) is more wear-resisting than the supporting or subjacent steel.
5. The male portion according to any one of the preceding claims, c h a r a c- t e r i z e d in that some of the following surface coating methods has been used in order to apply the layer (20): chemical or electrolytic plating, thermal spraying, or tool-tipping, preferably by means of laser.
6. The male portion according to any one of the preceding claims, c h a r a c- t e r i z e d in that the layer (20) is made from nickel, chromium, copper, tin, cobalt and titanium as well as alloys of the same, preferably erosion-resistant steel or Co or Ni base alloys.
7. The male portion according to any one of the preceding claims, c h a r a c- t e r i z e d in that additional layers are arranged in order to increase the binding between the layer (20) and the subjacent steel.
8. The male portion according to any one of the preceding claims, c h a r a ct e r i z e d in that a plane (P), which coincides with the shoulder (18), substantially touches or intersects the layer (20).
9. The male portion according to any one of the preceding claims, c h a r a c- t e r i z e d in that the material in the layer (20) has at least 50 mV higher electrode potential than the steel, preferably at least 100 mV, most preferably at least 250 mV higher electrode potential than the steel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0300498 | 2003-02-24 | ||
| SE0300498A SE525431C2 (en) | 2003-02-24 | 2003-02-24 | Trade for striking drilling |
| PCT/SE2004/000210 WO2004074624A1 (en) | 2003-02-24 | 2004-02-18 | Tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1597454A1 true EP1597454A1 (en) | 2005-11-23 |
| EP1597454B1 EP1597454B1 (en) | 2006-07-05 |
Family
ID=20290492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04712263A Expired - Lifetime EP1597454B1 (en) | 2003-02-24 | 2004-02-18 | Tool |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1597454B1 (en) |
| SE (1) | SE525431C2 (en) |
| WO (1) | WO2004074624A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE528777C2 (en) * | 2005-04-14 | 2007-02-13 | Sandvik Intellectual Property | Hanging and female threaded drill components and a threaded joint designed therewith |
| SE534770C2 (en) | 2010-01-11 | 2011-12-13 | Atlas Copco Rock Drills Ab | Striking rock drilling machine including a front part with a bobbin case |
| CN102704863B (en) * | 2012-06-20 | 2015-05-06 | 中国石油天然气集团公司 | Hot crack prevention internal screw joint of drill rod and manufacturing method for internal screw joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE505073C2 (en) * | 1994-07-19 | 1997-06-23 | Sandvik Ab | Threaded joints for striking drilling |
| SE506695C2 (en) * | 1994-11-23 | 1998-02-02 | Uniroc Ab | Threaded joint for striking drilling |
| SE505068C2 (en) * | 1995-03-27 | 1997-06-23 | Sandvik Ab | Method of transferring impact energy from a drilling tool to a borehole, rock drilling tool and drill bit for striking drilling |
| DE19541163A1 (en) * | 1995-11-04 | 1997-05-07 | Hawera Probst Kg Hartmetall | Drilling tool, in particular for processing stone |
| SE516651C2 (en) * | 1999-11-26 | 2002-02-05 | Sandvik Ab | Threaded joints for striking drilling, a trade and a female part |
| SE0000688L (en) * | 2000-03-02 | 2001-05-21 | Sandvik Ab | Rock drill bit and process for its manufacture |
-
2003
- 2003-02-24 SE SE0300498A patent/SE525431C2/en not_active IP Right Cessation
-
2004
- 2004-02-18 EP EP04712263A patent/EP1597454B1/en not_active Expired - Lifetime
- 2004-02-18 WO PCT/SE2004/000210 patent/WO2004074624A1/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004074624A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| SE0300498D0 (en) | 2003-02-24 |
| SE525431C2 (en) | 2005-02-22 |
| EP1597454B1 (en) | 2006-07-05 |
| WO2004074624A1 (en) | 2004-09-02 |
| SE0300498L (en) | 2004-08-25 |
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