CA1328448C - Drilling equipment - Google Patents
Drilling equipmentInfo
- Publication number
- CA1328448C CA1328448C CA000582819A CA582819A CA1328448C CA 1328448 C CA1328448 C CA 1328448C CA 000582819 A CA000582819 A CA 000582819A CA 582819 A CA582819 A CA 582819A CA 1328448 C CA1328448 C CA 1328448C
- Authority
- CA
- Canada
- Prior art keywords
- bit
- drill
- drilling
- drilling string
- extension body
- 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.)
- Expired - Lifetime
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 5
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 3
- 238000009527 percussion Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000000746 body region Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- ACXGJHCPFCFILV-UHFFFAOYSA-M sodium;2-(4-chloro-2-methylphenoxy)acetate;3,6-dichloro-2-methoxybenzoic acid Chemical compound [Na+].COC1=C(Cl)C=CC(Cl)=C1C(O)=O.CC1=CC(Cl)=CC=C1OCC([O-])=O ACXGJHCPFCFILV-UHFFFAOYSA-M 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1092—Gauge section of drill bits
-
- 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
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
- E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
-
- 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
- E21B17/22—Rods or pipes with helical structure
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
Abstract Title: Drilling equipment A drilling string for drilling long, straight holes in rock has a drill bit , an extension body screwed into the back of the drill bit and drill rod connectors which connect drill rod sections to one another. The bit is specifically for percussion or impact drilling and may be a button bit or a blade bit. The bit, the extension body and the connectors all have helically fluted cylindrical surfaces.
Description
TITLE: DRILLING EQUIPMENT
This invention relates to drilling equipment for the drilling of holes in rock by percussive techniques, where the drill bit is subjected to repeated axial impacts, whilst being rotated in the hole.
There is a requirement in modern mining and drilling practice for the production of long, straight holes. Such holes may for example be of the order of 35 metres in length and 75 millimetres in diameter. This invention is intended to facilitate the drilling of such holes.
According to the invention, there is provided a drilling string for drilling long straight holes in rock using a percussive drilling technique, the string comprising a drill bit, an extension body, at least two drill rods with threaded ends and at least one drill rod connector, the extension body being threadedly connected to the drill bit, one drill rod being threadedly connected to the extension body and the connector connecting the one drill rod to another drill rod, wherein all of the drill bit, the extension body and the connector have outer cylindrical surfaces with helical flutes formed in the surfaces.
The drill bit is preferably a button bit having buttons of a hard material such as a carbide material mounted in the cutting face. The invention is however also useful in connection with blade bits.
The use of an elongated cylindrical bit surface (with helical flutes to carry away the debris) helps to stabilise the bit in the hole and to ensure that a straight hole is produced.
, ~
13~8448 The diameter of the cylindrical surface is preferably 4 to 8 mm less than the gauge diameter of the cutt-ng face, when the bit is new.
, .
The use of a drill string having all these features enhances the straightness of a hole as it is drilled. Straight holes can be drilled with rod lengths of between one metre and six metres, ie with rods of most standard lengths.
In all three components, there are preferably four flutes around the circumference of the cylindrical surface, and the flutes and lands which separate the flutes preferably have approximately equal circumferential extents.
The angle of the helix is preferably between 20 and 30, and an angle of 26 has been found to be particularly suitable. Such a helix will turn through less than half a revolution over the length of a typical component which is likely to have an overall length of about 150 - 200 mm.
The bit is preferably arranged to be rotated anti-clockwise as it rotates, and the helix will be handed to conform to this direction of rotation.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a schematic view of a completed drill string in accordance with the invention;
Figures 2 and 3 are external views of two alternative drill bits in accordance with the invention;
Figure 4 is a section through the drill bit of Figure 2;
13~48 Figure 5 is a view in the direction of arrow A from Figure 4;
Figure 6 is an external view of an extension body in accordance with the invention:
Figure 7 is a cross sectional view of the extension body from Figure 6;
Figure 8 is a view of the extension body taken in the direction of the arrow B from Figure 7;
Figure 9 is an external view of a drill rod connector:
Figure 10 is a cross section view through the connector of Figure 9; and ' Figure 11 is an end view of the connector of Figure 10 taken in the direction of the arrow C from Figure 10.
20 The drill string shown in figure 1 consists of a bit 10, an extension body 12, a first drill rod 14, a drill rod connector 16 and a second drill rod 18. The threads which connect the various components will be one of the known threads which are specifically designed for connecting drill : -3-_,, ,, ., ~, -1 ~ '8~48 string components in percussive, rotary drilling. It should also be noted that the drill rods 14, 18, the extension body 12 and the bit 10 all have central flushing passages through which flushing medium passes from the drill itself to the cutting face of the bit.
The substantial cylindrical surface area presented by the components 10, 12 and 16 ensures that when a hole is drilled in rock, the forward progress of the bit is controlled for centricity by the contact made between the cylindrical surfaces and the walls of the hole as it is drilled. In this way it is possible to drill a long straight hole.
-3a-~., X :
~, ,. . _.
Figures 2 and 3 show respectively a button bit lOa and a blade bit lOb. The button bit has inserted carbide buttons 20 on its cutting face 22. An outer row of buttons 24 forms a gauge row or heel row and defines the diamet~r of the hole which will be drilled. Although it cannot be seen in the drawing, the outermost regions of these buttons extend radially beyond the cutting face itself to cut the edges of the hole, as is known in the art.
In the blade bit lOb, blades 26 of carbide material are inserted in the head. There will normally be four such blades equally spaced around the head, and they extend to the outer circumference of the head.
Both bits have outlet holes 28 for a flushing medium which is usually water, and which is passed down the centre of the drill string, exits through the holes 28 and 42 and then carries the drilling debris along the spiral flutes and out of the drilled hole.
1~ Immediately behind the cutting face 22, the bit narrow!to a neck 30, and from this neck helical flutes 32 extend towards the opposite end of the bit 34. The flutes 32 are spaced 25 from one another by lands 36. As can be seen from figure 5, there are four flutes 32 equally spaced around the circumference. Figures 2 and 3 show that the flutes 32 extend all the way fronl the neck 30 to the end 34 of the t bit.
Figure 5 shows how the bases of the flutes do not have sharp corners but in fact have large radii 38. These radii may amount to about 5mm.
1328 '~
The bit itself is of generally massive constructions as can be seen from figure 4, so that it can withstand repeated percussive blows which are used to make the bit drill the necessary hole. The bit has a socket 40 which carries an internal thread form (not shown, but which will be of a standard type known in this type of installation). From the front of the socket 40, flushing passages 28 and 42 extend towards the cutting face 22.
Figures 6, 7 and 8 show the extension body 12. On the outside of the body, helical flutes 44 and separating lands 46 are formed in much the same way as the flutes 32 and lands 36 in Figures 2 and 3. The lands 46 form an outer cylindrical surface which guides the drill string in the hole. One end of the extension body has a male threaded end 48, the thread corresponding to those on drill rods. This threaded end 48 can then be screwed into the socket 40 on the drill bit. At its other end the extension body has a socket 50 which corresponds to the socket 40 in the drill bit. A flushing passage 52 leads from the socket 50 to the opposite end of the body. The body al80 has a neck 54 between the threaded portion 48 and the cylindrical fluted region.
Figures 9, 10 and 11 show more details of the coupling 16 which has a tapered leading end 56 and a cylindrical body region 58 which is provided with helical flutes 60 and lands 62 similar to those already described for the bit and the extension body. The coupling has two female sockets 64 and 66 again with standard thread forms on them to receive standard threads on the ends of two drill rods to be connected.
132~448 Figure 1 shows the drill string with a length of the drill rod 14 broken away.
When drilling a long hole there will be a considerable number of drill rods 14, 18, etc, with the drill rods joined end to end by connectors 16. There will be a continuous flushing passage extending through the string.
The helix angle should be chosen so that it presents minimum hindrance to the flow of flushing medium and debris back up the hole. Typically the helix angle is between 20 and 30, preferably 26, with the angle being measured between a plane which includes the cylinder axis and one flank of one of the flutes, where the flute cuts the plane.
The drill string is to be rotated anti-clockwise to carry out drilling, and the fluting will be arranged so that, as seen looking into the hole, the ends of the fluting nearest the top of the hole trail the bottom ends wich are closest to the cutting face of the bit.
It i5 important that the diameters of the cylindrical surfaces on the various components be large enouyh to perform a worthwhile guiding function in conjunction with the walls of the drilled hole whilst avoiding the production of excess friction which would retard drilling. It is therefore necessary to reach a compromise which will permit an efficient action to take place. It has been found that a satisfactory action takes place if the diameter of the cylindrical surface is between 3 and 10 mm, preferably 6 mm less than the diameter of the heel row of button inserts on the drill bit.
This invention can be applied to drill strings which drill a 35 hole having a diameter b~tween 50 and 100 mm, and satisfactory operation has been proved at about 75mm diameter.
This invention relates to drilling equipment for the drilling of holes in rock by percussive techniques, where the drill bit is subjected to repeated axial impacts, whilst being rotated in the hole.
There is a requirement in modern mining and drilling practice for the production of long, straight holes. Such holes may for example be of the order of 35 metres in length and 75 millimetres in diameter. This invention is intended to facilitate the drilling of such holes.
According to the invention, there is provided a drilling string for drilling long straight holes in rock using a percussive drilling technique, the string comprising a drill bit, an extension body, at least two drill rods with threaded ends and at least one drill rod connector, the extension body being threadedly connected to the drill bit, one drill rod being threadedly connected to the extension body and the connector connecting the one drill rod to another drill rod, wherein all of the drill bit, the extension body and the connector have outer cylindrical surfaces with helical flutes formed in the surfaces.
The drill bit is preferably a button bit having buttons of a hard material such as a carbide material mounted in the cutting face. The invention is however also useful in connection with blade bits.
The use of an elongated cylindrical bit surface (with helical flutes to carry away the debris) helps to stabilise the bit in the hole and to ensure that a straight hole is produced.
, ~
13~8448 The diameter of the cylindrical surface is preferably 4 to 8 mm less than the gauge diameter of the cutt-ng face, when the bit is new.
, .
The use of a drill string having all these features enhances the straightness of a hole as it is drilled. Straight holes can be drilled with rod lengths of between one metre and six metres, ie with rods of most standard lengths.
In all three components, there are preferably four flutes around the circumference of the cylindrical surface, and the flutes and lands which separate the flutes preferably have approximately equal circumferential extents.
The angle of the helix is preferably between 20 and 30, and an angle of 26 has been found to be particularly suitable. Such a helix will turn through less than half a revolution over the length of a typical component which is likely to have an overall length of about 150 - 200 mm.
The bit is preferably arranged to be rotated anti-clockwise as it rotates, and the helix will be handed to conform to this direction of rotation.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a schematic view of a completed drill string in accordance with the invention;
Figures 2 and 3 are external views of two alternative drill bits in accordance with the invention;
Figure 4 is a section through the drill bit of Figure 2;
13~48 Figure 5 is a view in the direction of arrow A from Figure 4;
Figure 6 is an external view of an extension body in accordance with the invention:
Figure 7 is a cross sectional view of the extension body from Figure 6;
Figure 8 is a view of the extension body taken in the direction of the arrow B from Figure 7;
Figure 9 is an external view of a drill rod connector:
Figure 10 is a cross section view through the connector of Figure 9; and ' Figure 11 is an end view of the connector of Figure 10 taken in the direction of the arrow C from Figure 10.
20 The drill string shown in figure 1 consists of a bit 10, an extension body 12, a first drill rod 14, a drill rod connector 16 and a second drill rod 18. The threads which connect the various components will be one of the known threads which are specifically designed for connecting drill : -3-_,, ,, ., ~, -1 ~ '8~48 string components in percussive, rotary drilling. It should also be noted that the drill rods 14, 18, the extension body 12 and the bit 10 all have central flushing passages through which flushing medium passes from the drill itself to the cutting face of the bit.
The substantial cylindrical surface area presented by the components 10, 12 and 16 ensures that when a hole is drilled in rock, the forward progress of the bit is controlled for centricity by the contact made between the cylindrical surfaces and the walls of the hole as it is drilled. In this way it is possible to drill a long straight hole.
-3a-~., X :
~, ,. . _.
Figures 2 and 3 show respectively a button bit lOa and a blade bit lOb. The button bit has inserted carbide buttons 20 on its cutting face 22. An outer row of buttons 24 forms a gauge row or heel row and defines the diamet~r of the hole which will be drilled. Although it cannot be seen in the drawing, the outermost regions of these buttons extend radially beyond the cutting face itself to cut the edges of the hole, as is known in the art.
In the blade bit lOb, blades 26 of carbide material are inserted in the head. There will normally be four such blades equally spaced around the head, and they extend to the outer circumference of the head.
Both bits have outlet holes 28 for a flushing medium which is usually water, and which is passed down the centre of the drill string, exits through the holes 28 and 42 and then carries the drilling debris along the spiral flutes and out of the drilled hole.
1~ Immediately behind the cutting face 22, the bit narrow!to a neck 30, and from this neck helical flutes 32 extend towards the opposite end of the bit 34. The flutes 32 are spaced 25 from one another by lands 36. As can be seen from figure 5, there are four flutes 32 equally spaced around the circumference. Figures 2 and 3 show that the flutes 32 extend all the way fronl the neck 30 to the end 34 of the t bit.
Figure 5 shows how the bases of the flutes do not have sharp corners but in fact have large radii 38. These radii may amount to about 5mm.
1328 '~
The bit itself is of generally massive constructions as can be seen from figure 4, so that it can withstand repeated percussive blows which are used to make the bit drill the necessary hole. The bit has a socket 40 which carries an internal thread form (not shown, but which will be of a standard type known in this type of installation). From the front of the socket 40, flushing passages 28 and 42 extend towards the cutting face 22.
Figures 6, 7 and 8 show the extension body 12. On the outside of the body, helical flutes 44 and separating lands 46 are formed in much the same way as the flutes 32 and lands 36 in Figures 2 and 3. The lands 46 form an outer cylindrical surface which guides the drill string in the hole. One end of the extension body has a male threaded end 48, the thread corresponding to those on drill rods. This threaded end 48 can then be screwed into the socket 40 on the drill bit. At its other end the extension body has a socket 50 which corresponds to the socket 40 in the drill bit. A flushing passage 52 leads from the socket 50 to the opposite end of the body. The body al80 has a neck 54 between the threaded portion 48 and the cylindrical fluted region.
Figures 9, 10 and 11 show more details of the coupling 16 which has a tapered leading end 56 and a cylindrical body region 58 which is provided with helical flutes 60 and lands 62 similar to those already described for the bit and the extension body. The coupling has two female sockets 64 and 66 again with standard thread forms on them to receive standard threads on the ends of two drill rods to be connected.
132~448 Figure 1 shows the drill string with a length of the drill rod 14 broken away.
When drilling a long hole there will be a considerable number of drill rods 14, 18, etc, with the drill rods joined end to end by connectors 16. There will be a continuous flushing passage extending through the string.
The helix angle should be chosen so that it presents minimum hindrance to the flow of flushing medium and debris back up the hole. Typically the helix angle is between 20 and 30, preferably 26, with the angle being measured between a plane which includes the cylinder axis and one flank of one of the flutes, where the flute cuts the plane.
The drill string is to be rotated anti-clockwise to carry out drilling, and the fluting will be arranged so that, as seen looking into the hole, the ends of the fluting nearest the top of the hole trail the bottom ends wich are closest to the cutting face of the bit.
It i5 important that the diameters of the cylindrical surfaces on the various components be large enouyh to perform a worthwhile guiding function in conjunction with the walls of the drilled hole whilst avoiding the production of excess friction which would retard drilling. It is therefore necessary to reach a compromise which will permit an efficient action to take place. It has been found that a satisfactory action takes place if the diameter of the cylindrical surface is between 3 and 10 mm, preferably 6 mm less than the diameter of the heel row of button inserts on the drill bit.
This invention can be applied to drill strings which drill a 35 hole having a diameter b~tween 50 and 100 mm, and satisfactory operation has been proved at about 75mm diameter.
Claims (10)
1. A drilling string for drilling long straight holes in rock using a percussive drilling technique, the string comprising a drill bit, an extension body, at least two drill rods with threaded ends and at least one drill rod connector, the extension body being threadedly connected to the drill bit, one drill rod being threadedly connected to the extension body and the connector connecting the one drill rod to another drill rod, wherein all of the drill bit, the extension body and the connector have outer cylindrical surfaces with helical flutes formed in the surfaces.
2. A drilling string as claimed in Claim 1, wherein the drill bit has a cutting face carrying drilling inserts, a neck behind the cutting face, and a body portion having an outer cylindrical surface with helical flutes formed in the surface, a flushing hole extending through the bit to direct flushing medium to the cutting face, and a threaded socket for receiving a threaded end of the extension body, the cylindrical outer surface extending up to that end of the bit remote from the cutting face.
3. A drilling string as claimed in Claim 1, wherein the drill bit is a button bit.
4. A drilling string as claimed in Claim 1, wherein the drill bit is a blade bit.
5. A drilling string as claimed in Claim 2, wherein the diameter of the cylindrical surface of the drill bit body portion is 4 to 8 millimetres less than the gauge diameter of the cutting face, when the bit is new.
6. A drilling string as claimed in Claim 1, wherein the extension body has a male threaded end, a female threaded socket coaxial with the male end, an outer cylindrical surface with helical flutes formed in the surface and a flushing hole extending through the body, the male threaded end being adapted to screw into a socket in the drill bit, and the thread of the female socket being adapted to receive the threaded end of a drill rod.
7. A drilling string as claimed in Claim 1, wherein each cylindrical surface has four flutes around the circumference, and the flutes and the lands which separate the flutes, have approximately equal circumferential extents.
8. A drilling string as claimed in Claim 1, wherein the helix angle of the helical flutes is between 20° and 30°.
9. A drilling string as claimed in Claim 8, wherein the angle of each helix is approximately 26°.
10. A drilling string as claimed in Claim 1, wherein the helices are handed to conform to an anti-clockwise direction of rotation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8726475A GB2212091B (en) | 1987-11-12 | 1987-11-12 | Drilling equipment |
| GB8726475 | 1987-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1328448C true CA1328448C (en) | 1994-04-12 |
Family
ID=10626825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000582819A Expired - Lifetime CA1328448C (en) | 1987-11-12 | 1988-11-10 | Drilling equipment |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1328448C (en) |
| GB (1) | GB2212091B (en) |
| SE (1) | SE506499C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775010A (en) * | 2014-01-22 | 2014-05-07 | 西南石油大学 | Borehole cleaning tool for horizontal-section gas drilling |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4028261A1 (en) * | 1990-08-06 | 1992-02-13 | Fischer Artur Werke Gmbh | DRILLS FOR PRODUCING CYLINDRICAL DRILL HOLES |
| DE4236553A1 (en) * | 1992-10-29 | 1994-05-05 | Hawera Probst Kg Hartmetall | Rock drill |
| US5722496A (en) * | 1996-03-19 | 1998-03-03 | Ingersoll-Rand Company | Removable guide member for guiding drill string components in a drill hole |
| EP1273396B1 (en) | 2001-07-06 | 2009-12-30 | Robert Bosch Gmbh | Chisel resp. drill bit |
| EP2118429B1 (en) * | 2007-02-02 | 2016-04-13 | Halliburton Energy Services, Inc. | Rotary drill bit steerable system and method |
| US9784038B2 (en) * | 2013-06-17 | 2017-10-10 | Longyear Tm, Inc. | High-productivity drill bits |
| CN104018787B (en) * | 2014-05-27 | 2016-09-07 | 南通巨升非晶科技有限公司 | Helicoid hydraulic motor for oil exploitation |
| CN104389523B (en) * | 2014-09-18 | 2016-04-06 | 平顶山市安泰华矿用安全设备制造有限公司 | A kind of drilling equipment |
| CN104863525A (en) * | 2015-06-10 | 2015-08-26 | 马妮 | Deep-hole spiral pile hammer |
| EP3617439B1 (en) * | 2018-08-30 | 2021-07-28 | Sandvik Mining and Construction Tools AB | Drill bit with curved sludge grooves |
| EP3690181A1 (en) * | 2019-01-30 | 2020-08-05 | Sandvik Mining and Construction Tools AB | Guide adapter with wear inserts |
| CN112431561B (en) * | 2020-11-03 | 2023-12-19 | 河南理工大学 | Small-aperture downward drilling slag discharging drilling tool |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB776028A (en) * | 1955-02-15 | 1957-05-29 | John M Perkins & Smith Ltd | Drill bits |
| GB822029A (en) * | 1956-03-15 | 1959-10-21 | Coal Industry Patents Ltd | Improvements in or relating to scroll-type drilling tools |
| DE1255395B (en) * | 1965-07-19 | 1967-11-30 | Dibotec A G | Self-drilling anchor |
| US3970158A (en) * | 1975-04-28 | 1976-07-20 | Hughes Tool Company | Tooth loading for earth boring bits |
| GB2067440A (en) * | 1979-12-31 | 1981-07-30 | Huang Tien Tsai | Combined screw tap and drill |
| GB2075409A (en) * | 1980-05-09 | 1981-11-18 | Vnii Tugoplavkikh | Drills |
-
1987
- 1987-11-12 GB GB8726475A patent/GB2212091B/en not_active Expired - Lifetime
-
1988
- 1988-11-09 SE SE8804042A patent/SE506499C2/en not_active IP Right Cessation
- 1988-11-10 CA CA000582819A patent/CA1328448C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775010A (en) * | 2014-01-22 | 2014-05-07 | 西南石油大学 | Borehole cleaning tool for horizontal-section gas drilling |
| CN103775010B (en) * | 2014-01-22 | 2016-03-23 | 西南石油大学 | A kind of horizontal segment gas drilling hole cleaning instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2212091B (en) | 1992-01-22 |
| SE8804042L (en) | 1989-05-13 |
| GB8726475D0 (en) | 1987-12-16 |
| GB2212091A (en) | 1989-07-19 |
| SE506499C2 (en) | 1997-12-22 |
| SE8804042D0 (en) | 1988-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |
Effective date: 20110412 |