EP4328412A1 - Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé - Google Patents
Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé Download PDFInfo
- Publication number
- EP4328412A1 EP4328412A1 EP22192053.1A EP22192053A EP4328412A1 EP 4328412 A1 EP4328412 A1 EP 4328412A1 EP 22192053 A EP22192053 A EP 22192053A EP 4328412 A1 EP4328412 A1 EP 4328412A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drill pipe
- end piece
- drill
- end pieces
- piece
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 62
- 238000003466 welding Methods 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 15
- 230000013011 mating Effects 0.000 claims description 9
- 230000004323 axial length Effects 0.000 claims description 5
- 241000125205 Anethum Species 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000000007 visual effect Effects 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
- 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
-
- 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
-
- 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
- E21B17/16—Drill collars
Definitions
- the invention relates to an end piece of a drill pipe for a rotary or DTH drilling rig.
- the invention further relates to a drill pipe assembly and to a method of forming a drill pipe assembly to be used in a rock drilling rig.
- drill pipes In mines and at other work sites different type of rock drilling rigs are used for drilling drill holes to rock surfaces.
- rotary drilling and DTH drilling drill pipes are connected to a rock drilling machine or unit and are rotated by a rotation device.
- the drill pipe is an elongated hollow tubular and thin-walled element trough which drilling fluid is pumped down the hole to a drill bit.
- the drill pipe transfers rotation and torque from the rotation device to the drill bit and it also transmits axial feed forces.
- the drill pipe is provided with separate end pieces at its opposite ends. Joints between the end pieces and the drill pipe comprise shrink fits.
- the known solutions have shown some disadvantages, and especially relating to crack formation and overall durability of the joints between the components.
- An object of the invention is to provide a novel and improved end piece and drill pipe assembly for rotary or DTH drilling, and a method for forming a drill pipe assembly to be used in a rock drilling rig.
- the end piece according to the invention is characterized by the characterizing features of the first independent apparatus claim.
- the drill pipe assembly according to the invention is characterized by the characterizing features of the second independent apparatus claim.
- the method according to the invention is characterized by the characterizing features of the independent method claim.
- a drilling tool intended for a rotary or DTH drilling rig comprises one or more drill pipes.
- the drill pipe is provided with end pieces.
- the end piece is an elongated tubular piece and comprises a first end provided with first coupling means comprising thread surfaces for thread mounting with other drill components.
- An opposite second end is provided with second coupling means for coupling the end piece to the drill pipe by means of a shrink fit.
- the second coupling means comprise radial outwardly facing first contact surface extending a first axial distance from the second end towards the first end. Further, the first contact surface for providing the shrink fit has tapered configuration.
- the tapering second coupling means are formed on a male configuration which is configured to be received by a female configuration formed at an end of the drill pipe.
- the female part can also be considered as a socket part with the receiving feature and is provided with mating tapering surfaces.
- An advantage of the disclosed solution is that the shrink fit with the tapering shapes provides improved stress distribution between the assembled components and decreases the risks for cracks in the joint. This way high load carrying capacity is possible. Further, less interference is required to transfer the forces and the lower degree of interference means less stresses for the joint.
- the tapering surfaces provide also proper alignment for the end joints and drill pipe and thereby facilitate assembly of the components of the solution.
- the drill pipe ends may have greater wall thickness which is also beneficial for the load carrying capacity and durability of the solution.
- a further advantage is that the disclosed structure is relatively simple and inexpensive to manufacture.
- the tapering contact surfaces are relatively easy and quick to manufacture accurately by means of modern lathes.
- the first contact surface forms a truncated cone which can be inserted inside the socket part formed at the end of the drill pipe.
- An interference fit between the truncated cone and the socket part is formed when the contact surfaces of the truncated cone and the socket part overlap because of the insertion.
- the interference fit or shrink fit
- the two parts being connected are of slightly different sizes, and this discrepancy holds the parts together.
- the truncated cone i.e., an inside component
- the socket part i.e., the outside component
- the end piece and the drill pipe wherein the end piece is mounted are intended to be connected between a rotating head and a drill bit of the rock drilling rig.
- the end piece is part of a drill string and is configured to transmit torque and axial forces between components of the drill string during the drilling.
- Outer diameter of the first contact surface has minimum value at the second end and increases towards the second end.
- the tapering of the truncated cone is arranged so that diameter of the truncated cone increases from the second end towards the first end.
- angle of the tapering first contact surface is 0,2 - 12°. Magnitude of the angle of the tapering contact surface is dependent on dimensions of the end piece, and especially on diameter of the end piece.
- angle of the tapering first contact surface is 1 - 6°. In practical test it has been fount that this range is suitable especially for drilling tools with commonly implemented diameters.
- length of the first axial distance is 75 - 160 mm.
- axial dimension of the tapered male portion at the second end of the end piece is in accordance with the mentioned range 75 - 160 mm.
- axial length of the tapering first contact surface is defined by a stop surface being orientated perpendicularly in relation to longitudinal axis of the end piece.
- the truncated cone ends to the stop surface which is orientated perpendicularly in relation to longitudinal axis of the end piece.
- the stop surface is configured to set in the assembly against the front end of the drill pipe.
- the stop surface defines axial length of the tapering first contact surface and axial length where the contact surfaces of the truncated cone and the socket part intermesh.
- the second end of the end piece is provided with a radial inner surface extending an axial distance from the second end towards the first end.
- the inner surface has tapered configuration.
- the end piece comprises two tapering surfaces at its second end portion. Magnitude of angle of the tapering of the inner surface is significantly greater as compared to the tapering of the outer surface.
- an outer surface of the end piece is provided with at least one discard indicator comprising a recess having a predetermined depth.
- An advantage of the discard indicator is that a simple, robust, and reliable visual indicator is provided for providing information on degree of wear of the drill pipe assembly. An outer surface of the drill pipe assembly is subjected to wear during the use and material is loosened on the outer surface causing decrease in depth of the discard indicator.
- the operation of the discard indicator is based on phenomena wherein loosening of the material surrounding the recess leads to decrease in depth and information on degree of wearing is provided for an operator in an intuitive manner.
- the discard indicator is inexpensive to manufacture.
- the depth of the discard indicator is defined in relation to wall thickness of the drill pipe.
- the depth of the discard indicator is dimensioned to be half of dimension of a wall thickness of the drill pipe.
- the depth of the discard indicator is dimensioned to be 5 - 70 % of dimension of a wall thickness of the drill pipe.
- the depth of the discard indicator is dimensioned to be 10 - 60 % of dimension of a wall thickness of the drill pipe.
- the depth of the discard indicator is dimensioned to be 30 - 50 % of dimension of a wall thickness of the drill pipe.
- the discard indicator is located at a maximum axial distance 150 mm from the weld joint between the end piece and the drill tube. Then the discard indicator is intended to provide wearing data of the weld joint and to indicate when the wearing degree has reached a level wherein there is a risk that the weld joint is no longer capable of transmitting axial loads and torque.
- the discard indicator comprises at least one notch, groove, blind drilling, or any other type of recess.
- discard indicators there may be several discard indicators in the end piece. Alternatively, or in addition to one or more discard indicators may be provided on drill pipes.
- the discard indicators may form a group of blind holes, grooves, or recesses with different depths.
- the depths of the recesses may grow by predetermined steps and they may clearly indicate wearing degree of the examined component.
- the disclosed solution relates also to a drill pipe assembly for rotary or DTH drilling.
- the drill pipe assembly comprises a drill pipe and two end pieces mounted fixedly to opposite ends of the drill pipe.
- the end pieces comprise male portions with second coupling means provided with outwardly facing first contact surfaces and being inserted inside socket portions at ends of the drill pipe whereby the end pieces are connected to the ends of the dill pipe by means of shrink fits based on differences in the diameters existing between the male and socket portions.
- the mentioned end pieces are in accordance with the features disclosed in this document. Thereby mating radial contact surfaces between the male portions and the socket portions have tapered configuration.
- magnitude of the mentioned shrink fit is 0,1 - 0,8 mm.
- Amount of interference (tightness of fit, or degree of tightness) is controlled by amount of interference.
- the magnitude of the shrink fit indicates how much greater is a diameter of a shaft part in relation to a diameter of a hole part before being mounted. Since mating contact surfaces of the shaft part and the hole part are tapered, the examination needs to be done at cross-sections which have the same axial location and will match in the final shrink fit joint.
- magnitude of the mentioned shrink fit is 0,2 - 0,6 mm. It has been found in practical tests that this range for the shrink fit is particularly suitable for drilling pipes and end pieces with commonly used diameters.
- joints between the end pieces and the drill tube are provided with weld joints for providing additional fastening and ensuring the interference fit.
- the disclosed solution is utilized in rotary drilling wherein no impact devices are utilized in rock breaking.
- the rock drilling rig is utilized in down-the-hole drilling (DTH).
- DTH down-the-hole drilling
- a drill bit end of a rotated drilling tool is provided with an impact device, i.e., the impact device is located at a bottom of the drill hole during the drilling.
- the disclosed solution relates to a method of forming a drill pipe assembly to be used in a rock drilling rig.
- the method comprises: mounting end pieces to opposite ends of a tubular drill pipe; providing first ends of the end pieces with first coupling means comprising thread surfaces for thread mounting; providing opposite second ends of the end pieces with truncated cones wherein radial outer surfaces of the truncated cones form first contact surfaces; forming socket parts to both ends of the drill pipe for receiving the truncated cones and being provided with second contact surfaces; heating the ends of the drill pipe at the socket parts to expand diameters of the second contact surfaces by means of the thermal expansion; pushing the truncated cones inside the thermally expanded socket parts; allowing the heated socket parts to cool and shrink whereby shrink fits are formed between the first and second contact surfaces; and securing the mountings between the drill pipe and the end pieces by welding.
- the method further comprises providing the mating first and second connecting surfaces with tapered shapes.
- FIG. 1 shows a rock drilling rig 1 intended for surface drilling.
- the rock drilling rig 1 comprises a movable carrier 2 and at least one drilling mast 3 connected to the carrier 2.
- the mast 3 is provided with a drilling unit 4 provided with a rotating head 5 supported on the mast 3 and being movable in a drilling direction A and return direction B by means of a feed device 6.
- the rotating head 5 is connected to a drilling tool 7 by means of a subassembly 8.
- the drilling tool 7 is shown in a simplified manner for clarity reasons.
- the drilling tool 7 comprises one or more tubular elongated drill tube assemblies and a drill bit 9 at its distal end.
- the rotating head 5 rotates R the drilling tool 7 around its longitudinal axis and the drilling tool 7 is simultaneously fed towards a rock surface being drilled.
- Drilling cuttings are flushed by feeding flushing fluid from a flushing system Fs via the drilling tool 7 to a drill hole 10 being drilled so that the drilling cuttings are flushed away from the drill hole 10.
- the drilling unit 4 may be hydraulic whereby it may be connected to a hydraulic system Hs.
- Figure 2 discloses another solution which differs from the one shown in Figure 1 in that there is an impact device 11 mounted between a drill bit 9 and a drilling tool 7.
- the disclosed solution is intended for a down-the-hole drilling method, known also as DTH-drilling.
- a drilling unit 4 can be mounted movably on a feed beam 12, or in a similar manner as is shown in Figure 1 .
- the drilling tool 7 may comprise a drill pipe assembly which is in accordance with the solution disclosed in this document.
- Figure 3 discloses a drill pipe assembly 13 comprising a drill pipe 14 and two end pieces 15, 16 mounted fixedly to opposite ends of the drill pipe 14.
- Figure 3 discloses the drill tube 14 in a shortened view for clarity reasons.
- the end pieces 15, 16 are mounted to the ends of the drill tube 14 by arranging their joint ends one inside another and utilizing shrink fit between their substantially radial contact surfaces. The mounting is typically ensured by weld joints 17.
- the end pieces 14, 15 may be provided with one or more discard indicators 18 which may be blind drillings, for example.
- Figure 3 further shows boxes 19 and 20 at the joint areas and detailed structures of the joints are shown in Figures 4 and 5 .
- Figures 4 and 5 disclose that the end pieces 15, 16 comprise male portions 21 provided with outwardly facing first contact surfaces 22 and being inserted inside socket portions 23 at ends of the drill pipe 14.
- the socket portions 23 are provided with mating contact surfaces 24.
- the substantially radial mating contact surfaces between the male portions 21 and the socket portions 22 have tapered configurations.
- the end pieces 15, 16 are connected to the ends of the dill pipe 14 by means of shrink fits based on differences in the diameters existing between the male portions 21 and the socket portions 23.
- Figures 4 and 5 further discloses that the ends facing towards the drill pipe 14 are provided with radial inner surfaces 25 extending an axial distance from the second end towards the first end and having tapered configurations. Then the end pieces 15, 16 comprises two tapering surfaces at their end portions. Magnitude of angle of the tapering of the inner surfaces 25 is significantly greater as compared to the tapering of the outer surfaces.
- the end pieces 15, 16 are elongated tubular pieces and comprise outer surfaces 26 and inner surfaces 27.
- Figure 3 further discloses that the end pieces 15, 16 comprise first ends 28 provided with first coupling means 29 comprising thread surfaces 29 for thread mounting with other drill components. Opposite second ends are provided with the tapering second coupling means for the shrink fit with the drill pipe ends.
- Figure 6 discloses a joint between a second end portion 30 of an end piece 15,16 and a drill pipe 16.
- a male portion 21 with an angled contact surface 22 is mounted inside a socket portion 23 of the drill pipe 14 provided with a mating angled contact surface 24.
- Magnitude of angle K of the tapering contact surfaces 22, 24 may be 0,2 - 12°.
- Figure 7 discloses an end of an end piece 15, 16 provided with a male portion 21.
- the male portion 21 forms an axially protruding truncated cone at the end of the end piece 15, 16.
- the axial length L of the tapering first contact surface 22 may be defined by a stop surface 31 being orientated perpendicularly in relation to longitudinal axis of the end piece 15, 16.
- There may also be a shaped surface 32 for forming together with a correspondingly shaped end surface of a drill pipe a groove for a weld joint.
- Figure 8 discloses an end of a drill pipe 14 provided with a socket portion 23 for receiving a male portion of an end piece.
- Length L2 of the socket portion 23 is at least equal or greater compared to length of the male portion and the socket portion 23 comprises a tapered contact surface 24.
- a distal end of the drill pipe 14 may comprise a shaped surface 33 forming part of a welding groove.
- a drilling tool component for a rotary or DTH drilling wherein an outer surface of the component is provided with at least one discard indicator comprising a recess having an initial depth and wherein decrease of the initial depth is configured to indicate wear of the component.
- the drilling tool component may be a drill pipe, an end piece of a drill pipe, or any other component connectable between a rotating unit and a drill bit.
- the disclosed drilling tool component may or may not comprise tapered contact surfaces.
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- 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)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22192053.1A EP4328412A1 (fr) | 2022-08-25 | 2022-08-25 | Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé |
PCT/EP2023/073151 WO2024042128A1 (fr) | 2022-08-25 | 2023-08-23 | Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22192053.1A EP4328412A1 (fr) | 2022-08-25 | 2022-08-25 | Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4328412A1 true EP4328412A1 (fr) | 2024-02-28 |
Family
ID=83081549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22192053.1A Pending EP4328412A1 (fr) | 2022-08-25 | 2022-08-25 | Pièce d'extrémité de tige de forage, ensemble tige de forage et procédé |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4328412A1 (fr) |
WO (1) | WO2024042128A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3114566A (en) * | 1961-04-21 | 1963-12-17 | Kobe Inc | Shrink fit tubing joint |
US3542404A (en) * | 1968-02-01 | 1970-11-24 | Smith International | Control tubing |
US3923324A (en) * | 1973-03-20 | 1975-12-02 | Christensen Diamond Prod Co | Drill collar with thread connections |
US20050087983A1 (en) * | 2002-06-28 | 2005-04-28 | Vallourec Mannesmann Oil & Gas France | Reinforced tubular joint for improved sealing-tightness after plastic expansion |
-
2022
- 2022-08-25 EP EP22192053.1A patent/EP4328412A1/fr active Pending
-
2023
- 2023-08-23 WO PCT/EP2023/073151 patent/WO2024042128A1/fr unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3114566A (en) * | 1961-04-21 | 1963-12-17 | Kobe Inc | Shrink fit tubing joint |
US3542404A (en) * | 1968-02-01 | 1970-11-24 | Smith International | Control tubing |
US3923324A (en) * | 1973-03-20 | 1975-12-02 | Christensen Diamond Prod Co | Drill collar with thread connections |
US20050087983A1 (en) * | 2002-06-28 | 2005-04-28 | Vallourec Mannesmann Oil & Gas France | Reinforced tubular joint for improved sealing-tightness after plastic expansion |
Also Published As
Publication number | Publication date |
---|---|
WO2024042128A1 (fr) | 2024-02-29 |
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