EP3854985B1 - Lengthwise section, flexible drill rod and method - Google Patents
Lengthwise section, flexible drill rod and method Download PDFInfo
- Publication number
- EP3854985B1 EP3854985B1 EP20153219.9A EP20153219A EP3854985B1 EP 3854985 B1 EP3854985 B1 EP 3854985B1 EP 20153219 A EP20153219 A EP 20153219A EP 3854985 B1 EP3854985 B1 EP 3854985B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connector
- section
- lengthwise
- drill rod
- lengthwise section
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000005553 drilling Methods 0.000 claims description 29
- 238000011010 flushing procedure Methods 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 description 14
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101100008048 Caenorhabditis elegans cut-4 gene Proteins 0.000 description 1
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 208000034158 bleeding Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
- E21B7/025—Rock drills, i.e. jumbo drills
-
- 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
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
- E21D20/006—Machines for drilling anchor holes and setting anchor bolts having magazines for storing and feeding anchoring-bolts
Definitions
- the invention relates to a lengthwise section of a flexible drill rod.
- the invention further relates to a flexible drill rod.
- the invention still further relates to a method for managing a drilling or a maintenance of a flexible drill rod.
- the need for continuous drilling arises especially in the low profile (LP) and extra low profile (XLP) mines where rock support is a critical part of the process.
- the height of the mine gallery may be as low as 1.2 meters. Due to the rock conditions it is necessary to install up to 2-6 meter long rock reinforcement bolts to the roof of the mine.
- a lengthwise section of a flexible drill rod comprising
- the front sections or those parts close to a drill bit of the flexible drilling rod are worn much quicker than back sections far from the drill bit.
- the lengthwise section makes it possible to change only those sections of the flexible drill rod that are worn or break, without need for replacing the whole length of the flexible drill rod. Thereby great savings in using flexible drilling rods may be achieved.
- the length of the drilling rod may be tuned according to the wanted drilled hole length by adjusting the number of sections, i.e. by adding or removing the sections, in the drilling rod.
- a flexible drill rod comprising at least two lengthwise sections as claimed in any of the preceding claims, wherein the first connector of a first of said at least two lengthwise sections is attached to the second connector of a second of said at least two lengthwise sections.
- a method for managing a drilling or a maintenance of a flexible drill rod comprising
- the outer tube comprises at least one corrugated cut extending through a wall of the outer tube in a transverse direction, wherein said at least one corrugated cut has a substantially spiral baseline extending in a circulating manner around the outer tube in the lengthwise direction of the section.
- the at least one first connector element is detachable connectable to said at least one second connector element of said another section.
- the connectors comprise at least one locking system for preventing unintentional decoupling of the connectors.
- the locking system is incorporated in at least one of the connectors.
- the locking system comprises at least one standalone locking component.
- the at least one first connector element and said at least one second connector element establishing the tube connection are identical.
- the connector elements comprise lengthwise directed extensions and gaps therebetween arranged around the connector, the gap dimensioned for receiving the extension.
- the pipe connector elements comprise a sealing arrangement adapted to seal the internal pipe connection.
- the flexible drill rod comprises a drill bit, the drill bit having a drill bit connector adapted to be detachable attachable to one of the connectors of the lengthwise section for transmitting torque for rotation from the lengthwise section to the drill bit, and for allowing flushing medium flow in the internal pipe from the lengthwise section to the drill bit.
- the flexible drill rod comprises a drill bit, the drill bit having a drill bit connector, and an adapter element comprising a third connector adapted to be detachable attachable to the drill bit, and a fourth connector adapted to be detachable attachable to one of the connectors of the lengthwise section, the adapter element being adapted for transmitting torque for rotation from the lengthwise section to the drill bit, and for allowing flushing medium flow in the internal pipe from the lengthwise section to the drill bit.
- the adapter may allow a drill bit without first or second connector to be attached to the lengthwise section.
- the method comprises decoupling the first lengthwise section behind a drill bit and adding the substitutive lengthwise section to the opposite end of the drill rod.
- the method comprises adding the decoupled first lengthwise section as the substitutive lengthwise section to the opposite end of the drill rod.
- Figure 1a is a schematic view of two lengthwise sections of a flexible drill rod
- Figure 1b is a schematic side view of the lengthwise sections shown in Figure 1a in partial cross-section.
- the lengthwise section 1 comprises an outer tube 2 and an internal pipe 4 inside the outer tube 2. At least part of the outer tube 2 is flexible to enable bending in a transverse direction of the section 1.
- the section 1 is sensibly rigid in rotation to enable transmitting torque and thrust needed for drilling, or pulling force for removing the drilling rod, the torque and thrust at least mainly transmitted by the outer tube 2.
- the internal pipe 4 is adapted for managing flushing medium flow through the section 1 pumped from the machine to a drill bit.
- the flushing medium is liquid, such as water.
- the flushing medium is gas or gas mixture, such as air.
- the flushing medium is a mixture of liquid and gas, such as water and air.
- the flushing medium is a mixture of air and cuttings acting by air sucked from the drill bit to the machine for removing the cuttings from the drill bit.
- the internal pipe 4 has an ability to bend with the outer pipe 2.
- the length of the section 1 may be selected e.g. in range of 0,5 meter to 1,5 meters, or even more.
- the section 1 comprises a first connector 5 arranged at a first end 7 of the outer tube 2 and the internal pipe 4.
- the first connector comprises at least one first connector element 9 and at least one first pipe connector element 17.
- the section 1 comprises a second connector 6 arranged at a second end 8 that is opposite to the first end of the outer tube 2 and the internal pipe 4.
- the second connector 6 comprises at least one second connector element 10 and at least one second pipe connector element 18.
- first and second connectors 5, 6 are manufactured separately and welded to the section.
- the connectors may be attached to the section by fixing means, such as screws.
- the outer diameter of the outer tube 2 and the connectors 5, 6 is preferably below 30mm.
- the first connector 5 is arranged to establish a male connector and the second connector 6 is arranged to establish a female connector.
- the first connector 5 and the second connector 6 are designed so that a first connector 5 of a first lengthwise section 1 can be attached to a second connector 6 of a second lengthwise section 1.
- flexible drill rods 100 which are essentially longer than a single lengthwise section 1.
- the connector elements 5, 6 establishes a tube connection 11 for transmitting torque and rotational movement over the connection from one lengthwise section to another one.
- the connector elements also transmit longitudinal movements.
- the connector elements 9, 10 comprise lengthwise directed extensions 14 and gaps or bays 15 therebetween arranged around the connector 5, 6.
- the extensions 14 and gaps 15 arranged in the first connector 5 are dimensioned so that they may receive gaps and extensions of the second connector, respectively. According to an idea, the connection looks like a flute assembly.
- the pipe connector elements 17, 18 comprises internal channels that establish a pipe connection 12 allowing flushing medium flow in the internal pipe 4 from one lengthwise section to another one.
- the connectors 5, 6 comprise at least one locking system 13 for preventing unintentional decoupling of the connectors 5, 6.
- the locking system 13 comprises in the second connector element 10 a knob 21 that is arranged at an end of a flexible arm 22.
- the locking system 13 locks the connector elements 9, 10 together by forcing the knob 21 in the pit 23. It is to be noted that the design and number of the locking systems 13 may vary. For instance, two locking systems 13 can be arranged on opposite sides of the circumference of the connectors.
- the first connector element 9 may be detached from the second connector element 10 without breaking the lengthwise sections 1 or the connector elements.
- the knob 21 may be removed from the corresponding pit 23 by bending the flexible arm 22 outwards.
- the locking system can be un-lock with a screw driver or a specific tool. In another embodiment, the locking system can be un-lock manually.
- the pipe connector elements 17, 18 comprises a sealing arrangement 19 that is adapted to seal the pipe connection 12 in order to prevent flushing medium to leak out from the internal pipe 4.
- the sealing arrangement may comprise e.g. at least one O-ring (as shown in figure 1b ) or some another sealing element.
- the sealing arrangement automatically seal the pipe connection 12 as the connectors 5, 6 are attached to each other.
- the flexibility of the outer tube 2 is created by at least one cut 3, such as a corrugated cut, that extends through a wall of the outer tube 2 in a transverse direction thereof.
- the corrugated cut 3 may have a substantially spiral baseline extending in a circulating manner around the outer tube 2 in the lengthwise direction of the section 1.
- the corrugated cut 3 is arranged to deviate from its baseline on both sides of the baseline forming a cut of a substantially corrugated shape spiraling along the outer tube 2.
- the pipe connector elements 17, 18 are fixed to and rotated with the first and second connector elements 9, 10 and the outer pipe 2. Also the internal pipe 4 is rotating with the connector elements 9, 10 and the outer pipe 2. In another embodiment, the pipe connector elements 17, 18 are not fixed to the second connector elements 9, 10 and the outer pipe 2. Then, at least in principle, the pipe connector elements 17, 18 and the internal pipe 4 is able to rotate in relation to the outer tube 2. However, there are no apparatus forcing the internal pipe to rotate.
- a flexible drill rod 100 may be construed by connecting required number (at least two) of lengthwise sections 1 in succession and arranging a drill bit therein. Thus, the length of the drill rod 100 may be adjusted by selecting the number of the lengthwise sections 1 arranged in the drill rod 100.
- Figure 2a is a schematic view of a section of another flexible drill rod
- Figure 2b is a schematic view of the flexible drill rod shown in Figure 2a
- Figure 2c is a schematic side view of the flexible drill rod shown in Figure 2a in partial cross-section
- Figure 2d is a schematic side view of a detail of the flexible drill rod shown in Figure 2a in partial cross-section.
- the connector elements 9, 10 that transfers the torque, i.e. establishes the tube connection 11, are at least largely identical.
- the locking system 13 comprises at least one standalone locking component 20.
- the standalone locking component 20 has a C-shape of section of a circle.
- the locking component 20 is flexible so that it can be expanded and arranged around the first and the second connector 5, 6.
- Said first and second connectors 5, 6 have sections of grooves 24 on their outer perimeter.
- the sections of grooves 24 create a circumferential groove around the tube connection when the connectors 5, 6 are connected to each other.
- the lengthwise sections 1 can be detached after the locking component 20 is removed from the groove, e.g. manually or with a tool.
- the flexible drill rod 100 comprises a drill bit 16.
- the drill bit 16 has a drill bit connector 25 adapted to be detachable attachable directly to a lengthwise section 1.
- the drill bit connector 25 transmits torque from the lengthwise section 1 to the drill bit 16.
- the drill bit connector 25 further comprises a pipe connection that allows flushing medium flow in the internal pipe 4 from the lengthwise section to the drill bit 16.
- an adapter element 30 that is arrangeable between a lengthwise section 1 and the drill bit 16.
- the adapter element comprises a third connector 31 for detachable attachment to the drill bit 16, and a fourth connector 32 adapted to be detachable attachable to one of the connectors 5, 6 of the lengthwise section 1.
- the adapter element transmits torque from the lengthwise section to the drill bit and leads flushing medium flow from the internal pipe 4 to the drill bit 16 or vice versa.
- Figure 2d is showing the connection between two lengthwise sections in a more detailed way.
- An arrow is showing flow of flushing medium through the lengthwise sections 1 and the pipe connection 12.
- the pipe connection is sealed with a seal 29 that is an O-ring. It is to be noted that the sealing arrangement 19 may be realized many alternative ways.
- the connector In the end opposite to the drill bit end, there is a connector (not shown) that connects the internal pipe 4 to a supply hose (not shown) for supplying flushing medium fluid in the internal pipe 4.
- the connector comprises a turning joint that allows the supply hose being unrotating while the internal pipe 4 is rotating.
- Figure 3 is a schematic side view of a mine drilling machine.
- the mine drilling machine 26 has at least one drilling arrangement 28 that comprises a flexible drill rod 100 discussed in this description.
- the mine drilling machine 26 may comprise a boom 27 that is provided with the drilling arrangement 28. This particular type of a mine drilling machine 26 is especially suitable for tunnels and other drilling spaces of limited height, such as low profile mines.
- the mine drilling machine 26 may comprise not only drilling arrangement(s) 28 with the flexible drill rod 100, but also other type of mining equipment.
- Figure 4 illustrates a method for managing a drilling or a maintenance of a flexible drill rod.
- connection (s) 11, 12 of the lengthwise section to be decoupled it is decoupled a worn-out or damaged lengthwise section 1 from the drill rod 100 by opening 401 connection (s) 11, 12 of the lengthwise section to be decoupled. Then, one or more substitutive lengthwise section(s) is/are added 402 in the drill rod 100.
- the connector (s) 5, 6 of the substitutive lengthwise section(s) are connected 403 to connector (s) 5, 6 of the lengthwise section(s) in the drill rod (100).
- the decoupled first lengthwise section 1 is used as the substitutive lengthwise section 1 that is added to the opposite end of the drill rod 100.
- the decoupled first lengthwise section 1 is not attached back to the drill rod 100, but the sent e.g. to be repaired.
- the length of the drill rod 100 is adjusted by adding or removing lengthwise sections 1 in the drill rod 100.
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- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
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Description
- The invention relates to a lengthwise section of a flexible drill rod.
- The invention further relates to a flexible drill rod.
- The invention still further relates to a method for managing a drilling or a maintenance of a flexible drill rod.
- The need for continuous drilling arises especially in the low profile (LP) and extra low profile (XLP) mines where rock support is a critical part of the process. The height of the mine gallery may be as low as 1.2 meters. Due to the rock conditions it is necessary to install up to 2-6 meter long rock reinforcement bolts to the roof of the mine.
- Since the drilled length required is much longer than the height of the mine, currently extension drilling by adding rods is used. Adding rods takes time, lowers the efficiency of the process and risks persons when adding rods are often done by hand. Due to the space restriction a mechanic rod handler has not been seen feasible or as effective as manual handling.
- Documents
US2515365 A andUS2336338 A disclose priorly known flexible drill tubes. A documentEP2896780 discloses a flexible drill rod for continuous drilling, in which adding of rods may be avoided. A problem with the flexible drill rod is that it is a quite expensive part, and thus its replacement causes high costs. - Viewed from a first aspect, there can be provided a lengthwise section of a flexible drill rod, the section comprising
- an outer tube, wherein
- at least part of the outer tube is flexible in a transverse direction of the section and
- the section is rigid to enable transmitting torque and thrust needed for drilling, the section further comprising
- an internal pipe inside the outer tube for managing flushing medium flow through the section,
- the section comprising
- a first connector arranged at a first end of the outer tube and the internal pipe, the first connector comprising at least one first connector element and at least one first pipe connector element,
- a second connector arranged at a second end, opposite to said first end, of the outer tube and the internal pipe, the second connector comprising at least one second connector element and at least one second pipe connector element,
- the first connector and the second connector being adapted to be connectable to each other so that
- the first connector is attachable to the second connector of another lengthwise section of the flexible drill rod, and
- the connector elements being identical and comprising lengthwise directed extensions and gaps therebetween arranged around the connector, the gap dimensioned for receiving the extension, the connector elements thereby establishing
- a tube connection for transmitting torque for rotation of said sections, and
- the pipe connector elements establishing
- a pipe connection with an internal channel for allowing flushing medium flow in the internal pipe through said sections.
- When a hole is drilled with a flexible drill rod, the front sections or those parts close to a drill bit of the flexible drilling rod are worn much quicker than back sections far from the drill bit. Now the lengthwise section makes it possible to change only those sections of the flexible drill rod that are worn or break, without need for replacing the whole length of the flexible drill rod. Thereby great savings in using flexible drilling rods may be achieved. Additionally, the length of the drilling rod may be tuned according to the wanted drilled hole length by adjusting the number of sections, i.e. by adding or removing the sections, in the drilling rod.
- Viewed from a further aspect, there can be provided a flexible drill rod, comprising at least two lengthwise sections as claimed in any of the preceding claims, wherein the first connector of a first of said at least two lengthwise sections is attached to the second connector of a second of said at least two lengthwise sections.
- Thereby a drill rod having exceptionally low expenses in its life cycle may be achieved.
- Viewed from a still further aspect, there can be provided a method for managing a drilling or a maintenance of a flexible drill rod, the drill rod comprising plurality of the lengthwise sections of a flexible drill rod disclosed above, the method comprising
- decoupling a worn-out or damaged lengthwise section from the drill rod by opening connection(s) of said lengthwise section, and
- adding a substitutive lengthwise section in the drill rod by connecting connector(s) of said substitutive lengthwise section to connector(s) of at least one lengthwise section in the drill rod.
- Thereby a method creating great saving in using flexible drill rods may be achieved.
- The arrangement and the method are characterised by what is stated in the independent claims. Some other embodiments are characterised by what is stated in the other claims. Inventive embodiments are also disclosed in the specification and drawings of this patent application. The inventive content of the patent application may also be defined in other ways than defined in the following claims. The inventive content may also be formed of several separate inventions, especially if the invention is examined in the light of expressed or implicit sub-tasks or in view of obtained benefits or benefit groups. Some of the definitions contained in the following claims may then be unnecessary in view of the separate inventive ideas. Features of the different embodiments of the invention may, within the scope of the basic inventive idea, be applied to other embodiments.
- In one embodiment, the outer tube comprises at least one corrugated cut extending through a wall of the outer tube in a transverse direction, wherein said at least one corrugated cut has a substantially spiral baseline extending in a circulating manner around the outer tube in the lengthwise direction of the section. An advantage is that a high flexibility of the drill rod may be achieved.
- In one embodiment, the at least one first connector element is detachable connectable to said at least one second connector element of said another section. An advantage is that the sections can be decoupled without damaging thereof, and thus the decoupled section may be easily added to the same or another drill rod.
- In one embodiment, the connectors comprise at least one locking system for preventing unintentional decoupling of the connectors. An advantage is that the reliability of the arrangement may be improved.
- In one embodiment, the locking system is incorporated in at least one of the connectors. An advantage is that number of components relating to the drilling rod may be limited.
- In one embodiment, the locking system comprises at least one standalone locking component. An advantage is that the state of the locking may be easily checked.
- In one embodiment, the at least one first connector element and said at least one second connector element establishing the tube connection are identical. An advantage is that the manufacturing means of the connectors may be simplified.
- In one embodiment, the connector elements comprise lengthwise directed extensions and gaps therebetween arranged around the connector, the gap dimensioned for receiving the extension. An advantage is that a simple way to transfer torque through some teeth between the lengthwise sections may be achieved.
- In one embodiment, the pipe connector elements comprise a sealing arrangement adapted to seal the internal pipe connection. An advantage is that risk of bleeding or leaking of the inner pipe may be minimized.
- In one embodiment, the flexible drill rod comprises a drill bit, the drill bit having a drill bit connector adapted to be detachable attachable to one of the connectors of the lengthwise section for transmitting torque for rotation from the lengthwise section to the drill bit, and for allowing flushing medium flow in the internal pipe from the lengthwise section to the drill bit. An advantage is that the lengthwise section is also possible to be attached to the drill bit.
- In one embodiment, the flexible drill rod comprises a drill bit, the drill bit having a drill bit connector, and an adapter element comprising a third connector adapted to be detachable attachable to the drill bit, and a fourth connector adapted to be detachable attachable to one of the connectors of the lengthwise section, the adapter element being adapted for transmitting torque for rotation from the lengthwise section to the drill bit, and for allowing flushing medium flow in the internal pipe from the lengthwise section to the drill bit. An advantage is that the adapter may allow a drill bit without first or second connector to be attached to the lengthwise section.
- In one embodiment, the method comprises decoupling the first lengthwise section behind a drill bit and adding the substitutive lengthwise section to the opposite end of the drill rod. An advantage is that a uniform wear of the drill rod may be achieved after several drilling operations.
- In one embodiment, the method comprises adding the decoupled first lengthwise section as the substitutive lengthwise section to the opposite end of the drill rod. An advantage is that the lengthwise section can still be utilized in the drill rod but in section less susceptible to wear.
- Some embodiments illustrating the present disclosure are described in more detail in the attached drawings, in which
-
Figure 1a is a schematic view of two lengthwise sections of a flexible drill rod, -
Figure 1b is a schematic side view of the lengthwise sections shown inFigure 1a in partial cross-section, -
Figure 2a is a schematic view of a part of another flexible drill rod, -
Figure 2b is a schematic view of the assembled flexible drill rod shown inFigure 2a , -
Figure 2c is a schematic side view of the flexible drill rod shown inFigure 2a in partial cross-section, -
Figure 2d is a schematic side view of a detail of the flexible drill rod shown inFigure 2a in partial cross-section, -
Figure 3 is a schematic side view of a drilling machine, and -
Figure 4 illustrates a method for managing a drilling or a maintenance of a flexible drill rod. - In the figures, some embodiments are shown simplified for the sake of clarity. Similar parts are marked with the same reference numbers in the figures.
-
Figure 1a is a schematic view of two lengthwise sections of a flexible drill rod, andFigure 1b is a schematic side view of the lengthwise sections shown inFigure 1a in partial cross-section. - The
lengthwise section 1 comprises anouter tube 2 and aninternal pipe 4 inside theouter tube 2. At least part of theouter tube 2 is flexible to enable bending in a transverse direction of thesection 1. Thesection 1 is sensibly rigid in rotation to enable transmitting torque and thrust needed for drilling, or pulling force for removing the drilling rod, the torque and thrust at least mainly transmitted by theouter tube 2. - The
internal pipe 4 is adapted for managing flushing medium flow through thesection 1 pumped from the machine to a drill bit. In an embodiment, the flushing medium is liquid, such as water. In another embodiment, the flushing medium is gas or gas mixture, such as air. In still another embodiment, the flushing medium is a mixture of liquid and gas, such as water and air. In still another embodiment, the flushing medium is a mixture of air and cuttings acting by air sucked from the drill bit to the machine for removing the cuttings from the drill bit. Theinternal pipe 4 has an ability to bend with theouter pipe 2. - The length of the
section 1 may be selected e.g. in range of 0,5 meter to 1,5 meters, or even more. - The
section 1 comprises afirst connector 5 arranged at afirst end 7 of theouter tube 2 and theinternal pipe 4. The first connector comprises at least onefirst connector element 9 and at least one firstpipe connector element 17. - Additionally, the
section 1 comprises asecond connector 6 arranged at asecond end 8 that is opposite to the first end of theouter tube 2 and theinternal pipe 4. Thesecond connector 6 comprises at least onesecond connector element 10 and at least one secondpipe connector element 18. - In an embodiment, the first and
second connectors - In an embodiment, the outer diameter of the
outer tube 2 and theconnectors - In an embodiment, the
first connector 5 is arranged to establish a male connector and thesecond connector 6 is arranged to establish a female connector. Thefirst connector 5 and thesecond connector 6 are designed so that afirst connector 5 of a firstlengthwise section 1 can be attached to asecond connector 6 of a secondlengthwise section 1. Thus, it is possible to buildflexible drill rods 100 which are essentially longer than a singlelengthwise section 1. - The
connector elements tube connection 11 for transmitting torque and rotational movement over the connection from one lengthwise section to another one. The connector elements also transmit longitudinal movements. In some embodiments, such as one shown inFigures 1a - 1b , theconnector elements extensions 14 and gaps orbays 15 therebetween arranged around theconnector extensions 14 andgaps 15 arranged in thefirst connector 5 are dimensioned so that they may receive gaps and extensions of the second connector, respectively. According to an idea, the connection looks like a flute assembly. - The
pipe connector elements pipe connection 12 allowing flushing medium flow in theinternal pipe 4 from one lengthwise section to another one. - The
tube connection 11 and thepipe connection 12 can be opened and thelengthwise sections 1 separated from each other. In an embodiment, theconnectors locking system 13 for preventing unintentional decoupling of theconnectors system 13 comprises in the second connector element 10 aknob 21 that is arranged at an end of aflexible arm 22. In thefirst connector element 9 there is a pit orgroove 23. The lockingsystem 13 locks theconnector elements knob 21 in thepit 23. It is to be noted that the design and number of thelocking systems 13 may vary. For instance, twolocking systems 13 can be arranged on opposite sides of the circumference of the connectors. - The
first connector element 9 may be detached from thesecond connector element 10 without breaking thelengthwise sections 1 or the connector elements. For instance, in the embodiment shown inFigures 1a - 1b , theknob 21 may be removed from the correspondingpit 23 by bending theflexible arm 22 outwards. In an embodiment, the locking system can be un-lock with a screw driver or a specific tool. In another embodiment, the locking system can be un-lock manually. - In an embodiment, the
pipe connector elements arrangement 19 that is adapted to seal thepipe connection 12 in order to prevent flushing medium to leak out from theinternal pipe 4. The sealing arrangement may comprise e.g. at least one O-ring (as shown infigure 1b ) or some another sealing element. In an embodiment, the sealing arrangement automatically seal thepipe connection 12 as theconnectors - In an embodiment, the flexibility of the
outer tube 2 is created by at least onecut 3, such as a corrugated cut, that extends through a wall of theouter tube 2 in a transverse direction thereof. Thecorrugated cut 3 may have a substantially spiral baseline extending in a circulating manner around theouter tube 2 in the lengthwise direction of thesection 1. In an embodiment, thecorrugated cut 3 is arranged to deviate from its baseline on both sides of the baseline forming a cut of a substantially corrugated shape spiraling along theouter tube 2. - In an embodiment, the
pipe connector elements second connector elements outer pipe 2. Also theinternal pipe 4 is rotating with theconnector elements outer pipe 2. In another embodiment, thepipe connector elements second connector elements outer pipe 2. Then, at least in principle, thepipe connector elements internal pipe 4 is able to rotate in relation to theouter tube 2. However, there are no apparatus forcing the internal pipe to rotate. - A
flexible drill rod 100 may be construed by connecting required number (at least two) oflengthwise sections 1 in succession and arranging a drill bit therein. Thus, the length of thedrill rod 100 may be adjusted by selecting the number of thelengthwise sections 1 arranged in thedrill rod 100. -
Figure 2a is a schematic view of a section of another flexible drill rod,Figure 2b is a schematic view of the flexible drill rod shown inFigure 2a, Figure 2c is a schematic side view of the flexible drill rod shown inFigure 2a in partial cross-section, andFigure 2d is a schematic side view of a detail of the flexible drill rod shown inFigure 2a in partial cross-section. - In an embodiment, such as shown in
Figures 2a - 2c , theconnector elements tube connection 11, are at least largely identical. - In one embodiment, the locking
system 13 comprises at least onestandalone locking component 20. In the embodiment shown inFigures 2a - 2d , thestandalone locking component 20 has a C-shape of section of a circle. Thelocking component 20 is flexible so that it can be expanded and arranged around the first and thesecond connector second connectors connectors locking component 20 is aligned in the groove, it prevents separation of thelengthwise sections 1. Thelengthwise sections 1 can be detached after thelocking component 20 is removed from the groove, e.g. manually or with a tool. - In an embodiment, the
flexible drill rod 100 comprises adrill bit 16. In an embodiment, such as shown inFigures 2a - 2d , thedrill bit 16 has adrill bit connector 25 adapted to be detachable attachable directly to alengthwise section 1. Thedrill bit connector 25 transmits torque from thelengthwise section 1 to thedrill bit 16. Thedrill bit connector 25 further comprises a pipe connection that allows flushing medium flow in theinternal pipe 4 from the lengthwise section to thedrill bit 16. - In another embodiment, there is an
adapter element 30 that is arrangeable between alengthwise section 1 and thedrill bit 16. The adapter element comprises athird connector 31 for detachable attachment to thedrill bit 16, and afourth connector 32 adapted to be detachable attachable to one of theconnectors lengthwise section 1. The adapter element transmits torque from the lengthwise section to the drill bit and leads flushing medium flow from theinternal pipe 4 to thedrill bit 16 or vice versa. -
Figure 2d is showing the connection between two lengthwise sections in a more detailed way. An arrow is showing flow of flushing medium through thelengthwise sections 1 and thepipe connection 12. The pipe connection is sealed with aseal 29 that is an O-ring. It is to be noted that the sealingarrangement 19 may be realized many alternative ways. - In the end opposite to the drill bit end, there is a connector (not shown) that connects the
internal pipe 4 to a supply hose (not shown) for supplying flushing medium fluid in theinternal pipe 4. In an embodiment, the connector comprises a turning joint that allows the supply hose being unrotating while theinternal pipe 4 is rotating. -
Figure 3 is a schematic side view of a mine drilling machine. - The
mine drilling machine 26 has at least onedrilling arrangement 28 that comprises aflexible drill rod 100 discussed in this description. - The
mine drilling machine 26 may comprise aboom 27 that is provided with thedrilling arrangement 28. This particular type of amine drilling machine 26 is especially suitable for tunnels and other drilling spaces of limited height, such as low profile mines. - The
mine drilling machine 26 may comprise not only drilling arrangement(s) 28 with theflexible drill rod 100, but also other type of mining equipment. -
Figure 4 illustrates a method for managing a drilling or a maintenance of a flexible drill rod. - In the method, it is decoupled a worn-out or damaged lengthwise
section 1 from thedrill rod 100 by opening 401 connection (s) 11, 12 of the lengthwise section to be decoupled. Then, one or more substitutive lengthwise section(s) is/are added 402 in thedrill rod 100. The connector (s) 5, 6 of the substitutive lengthwise section(s) are connected 403 to connector (s) 5, 6 of the lengthwise section(s) in the drill rod (100). - In an embodiment of the method, it is changed the first
lengthwise section 1 behind adrill bit 16 and added the substitutive lengthwisesection 1 to the opposite end of thedrill rod 100, i.e. the lastlengthwise section 1 counted from thedrill bit 16. In an embodiment, the decoupled first lengthwisesection 1 is used as the substitutive lengthwisesection 1 that is added to the opposite end of thedrill rod 100. However, in another embodiment, the decoupled first lengthwisesection 1 is not attached back to thedrill rod 100, but the sent e.g. to be repaired. - In an embodiment, the length of the
drill rod 100 is adjusted by adding or removinglengthwise sections 1 in thedrill rod 100. - It is to be noted that it is possible to attach or detach not only one but two or even more
lengthwise sections 1 at the same time. - The invention is defined by the claims below.
-
- 1
- lengthwise section
- 2
- outer tube
- 3
- corrugated cut
- 4
- internal pipe
- 5
- first connector
- 6
- second connector
- 7
- first end
- 8
- second end
- 9
- first connector element
- 10
- second connector element
- 11
- tube connection
- 12
- pipe connection
- 13
- locking system
- 14
- extension
- 15
- gap
- 16
- drill bit
- 17
- first pipe connector element
- 18
- second pipe connector element
- 19
- sealing arrangement
- 20
- standalone locking component
- 21
- knob
- 22
- arm
- 23
- pit
- 24
- groove
- 25
- drill bit connector
- 26
- drilling machine
- 27
- boom
- 28
- drilling arrangement
- 29
- seal
- 30
- adapter element
- 31
- third connector
- 32
- fourth connector
- 100
- flexible drill rod
- 401-403
- method steps
Claims (13)
- A lengthwise section (1) of a flexible drill rod (100), the section comprising- an outer tube (2), wherein- at least part of the outer tube (2) is flexible in a transverse direction of the section (1) and- the section (1) is rigid to enable transmitting torque and thrust needed for drilling, the section (1) further comprising- an internal pipe (4) inside the outer tube (2) for managing flushing medium flow through the section (1),the section (1) comprising- a first connector (5) arranged at a first end (7) of the outer tube (2) and the internal pipe (4), the first connector comprising at least one first connector element (9) and at least one first pipe connector element (17),- a second connector (6) arranged at a second end (8), opposite to said first end, of the outer tube (2) and the internal pipe (4), the second connector comprising at least one second connector element (10) and at least one second pipe connector element (18),- the first connector (5) and the second connector (6) being adapted to be connectable to each other so thatthe first connector (5) is attachable to the second connector (6) of another lengthwise section (1) of the flexible drill rod, andthe connector elements (9, 10) establishing- a tube connection (11) for transmitting torque for rotation of said sections, andthe pipe connector elements (17, 18) establishingcharacterized in that- a pipe connection (12) with an internal channel for allowing flushing medium flow in the internal pipe (4) through said sections;
said at least one first connector element (9) and said at least one second connector element (10) establishing the tube connection (11) are identical and comprise lengthwise directed extensions (14) and gaps (15) therebetween arranged around the connector (5, 6), the gap (15) dimensioned for receiving the extension (14). - The lengthwise section as claimed in claim 1, wherein the outer tube (2) comprises- at least one corrugated cut (3) extending through a wall of the outer tube (2) in a transverse direction, wherein- said at least one corrugated cut (3) has a substantially spiral baseline extending in a circulating manner around the outer tube in the lengthwise direction of the section (1) .
- The lengthwise section as claimed in claims 1 or 2, wherein said at least one first connector element (9) is detachable connectable to said at least one second connector element (10) of said another section.
- The lengthwise section as claimed in any of the preceding claims, wherein the connectors (5, 6) comprise at least one locking system (13) for preventing unintentional decoupling of the connectors (5, 6).
- The lengthwise section as claimed in claim 4, wherein the locking system (13, 20 ,21) is incorporated in at least one of the connectors (5, 6).
- The lengthwise section as claimed in claim 4, wherein the locking system (13) comprises at least one standalone locking component (20).
- The lengthwise section as claimed in any of the preceding claims, wherein the pipe connector elements (17, 18) comprises a sealing arrangement adapted to seal the pipe connection (12).
- A flexible drill rod, comprising at least two lengthwise sections (1) as claimed in any of the preceding claims, wherein the first connector (5) of a first of said at least two lengthwise sections is attached to the second connector (6) of a second of said at least two lengthwise sections by means of a locking system.
- The flexible drill rod as claimed in claim 8, comprising a drill bit (16), the drill bit (16) having a drill bit connector (25) adapted to be detachable attachable to one of the connectors (5, 6) of the lengthwise section (1) for transmitting torque for rotation from the lengthwise section (1) to the drill bit (16), and for allowing flushing medium flow in the internal pipe (4) from the lengthwise section to the drill bit (16) or vice versa.
- The flexible drill rod as claimed in claim 8, comprising- a drill bit (16), the drill bit (16) having a drill bit connector (25), and- an adapter element (30) comprising-- a third connector (31) adapted to be detachable attachable to the drill bit (16), and-- a fourth connector (32) adapted to be detachable attachable to one of the connectors (5, 6) of the lengthwise section (1),- the adapter element (30) being adapted for transmitting torque for rotation from the lengthwise section to the drill bit (16), and for allowing flushing medium flow in the internal pipe (4) from the lengthwise section to the drill bit (16).
- A method for managing the maintenance of a flexible drill rod (100), the drill rod (100) comprising plurality of the lengthwise sections (1) of a flexible drill rod claimed in any of claims 1 - 7, the method comprising- decoupling a worn-out or damaged lengthwise section (1) from the drill rod (100) by opening (401) connection(s) (11, 12) of said lengthwise section, and- adding (402) a substitutive lengthwise section (1) in the drill rod (100) by connecting (403) connector(s) (5, 6) of said substitutive lengthwise section to connector(s) (5, 6) of at least one lengthwise section in the drill rod (100).
- The method as claimed in claim 11, comprising- decoupling the first lengthwise section (1) behind a drill bit (16), and- adding the substitutive lengthwise section (1) to the opposite end of the drill rod (100).
- The method as claimed in claim 12, comprising- adding the decoupled first lengthwise section (1) as the substitutive lengthwise section (1) to the opposite end of the drill rod (100).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20153219.9A EP3854985B1 (en) | 2020-01-22 | 2020-01-22 | Lengthwise section, flexible drill rod and method |
FIEP20153219.9T FI3854985T3 (en) | 2020-01-22 | 2020-01-22 | Lengthwise section, flexible drill rod and method |
PL20153219.9T PL3854985T3 (en) | 2020-01-22 | 2020-01-22 | Lengthwise section, flexible drill rod and method |
MX2021000870A MX2021000870A (en) | 2020-01-22 | 2021-01-21 | Lengthwise section, flexible drill rod and method. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20153219.9A EP3854985B1 (en) | 2020-01-22 | 2020-01-22 | Lengthwise section, flexible drill rod and method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3854985A1 EP3854985A1 (en) | 2021-07-28 |
EP3854985B1 true EP3854985B1 (en) | 2023-03-08 |
Family
ID=69187719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20153219.9A Active EP3854985B1 (en) | 2020-01-22 | 2020-01-22 | Lengthwise section, flexible drill rod and method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3854985B1 (en) |
FI (1) | FI3854985T3 (en) |
MX (1) | MX2021000870A (en) |
PL (1) | PL3854985T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7220820B1 (en) * | 2022-02-28 | 2023-02-10 | 株式会社トーメック | An underground propulsion body and a laying method using the same. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2336338A (en) * | 1932-04-20 | 1943-12-07 | John A Zublin | Apparatus for drilling bores deviating from existing well bores |
US2515365A (en) * | 1947-03-31 | 1950-07-18 | Edward Adolphus Zublin | Flexible drill pipe |
US2642267A (en) * | 1951-01-17 | 1953-06-16 | John A Zublin | Apparatus for initiating and drilling deviating curved bores from existing vertical wll bores |
EP2896780A1 (en) | 2014-01-17 | 2015-07-22 | Sandvik Mining and Construction Lyon SAS | Flexible drill rod |
-
2020
- 2020-01-22 FI FIEP20153219.9T patent/FI3854985T3/en active
- 2020-01-22 PL PL20153219.9T patent/PL3854985T3/en unknown
- 2020-01-22 EP EP20153219.9A patent/EP3854985B1/en active Active
-
2021
- 2021-01-21 MX MX2021000870A patent/MX2021000870A/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3854985A1 (en) | 2021-07-28 |
MX2021000870A (en) | 2021-07-23 |
FI3854985T3 (en) | 2023-04-04 |
PL3854985T3 (en) | 2023-06-05 |
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