WO2010128861A1 - Guiding device for rock drilling machine - Google Patents

Guiding device for rock drilling machine Download PDF

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Publication number
WO2010128861A1
WO2010128861A1 PCT/NO2010/000157 NO2010000157W WO2010128861A1 WO 2010128861 A1 WO2010128861 A1 WO 2010128861A1 NO 2010000157 W NO2010000157 W NO 2010000157W WO 2010128861 A1 WO2010128861 A1 WO 2010128861A1
Authority
WO
WIPO (PCT)
Prior art keywords
guiding
drill
centre axis
string
rock
Prior art date
Application number
PCT/NO2010/000157
Other languages
French (fr)
Inventor
Sigurd Kjell Haughom
Hans Are Vatland
Original Assignee
Norwegian Hard Rock Drilling As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Norwegian Hard Rock Drilling As filed Critical Norwegian Hard Rock Drilling As
Priority to EP10772302.5A priority Critical patent/EP2427623B1/en
Publication of WO2010128861A1 publication Critical patent/WO2010128861A1/en

Links

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
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/067—Deflecting the direction of boreholes with means for locking sections of a pipe or of a guide for a shaft in angular relation, e.g. adjustable bent sub
    • 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
    • E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
    • 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
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/062—Deflecting the direction of boreholes the tool shaft rotating inside a non-rotating guide travelling with the shaft
    • 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
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/068—Deflecting the direction of boreholes drilled by a down-hole drilling motor

Definitions

  • This invention relates to a guiding device for a rock- drilling machine. More particularly, it relates to a guiding device for a rock-drilling machine, the rock-drilling machine including a drill portion with a drill bit which has a drill - portion centre axis, and a string portion with a string- portion centre axis, the drill portion and the string portion being interconnected by means of a guiding joint.
  • Rock-drilling machines of the kind initially mentioned may be connected by means of a pipe string to a driving device on the outside of a rock that is being drilled.
  • the rock- drilling machine is guided while it is being moved in a borehole, by turning the guiding joint in such a way that the drill-portion centre axis takes an angle relative to the string-portion centre axis.
  • the guiding joint is designed to change the angle between said centre axes in any direction and is additionally arranged to transmit the torque from the drill bit.
  • a guiding device for a rock-drilling machine including a drill portion with a drill bit which has a drill-portion centre axis, and a string portion with a string-portion centre axis, the drill portion and the string portion being interconnected by means of a guiding joint.
  • the guiding device is characterized by the drill portion being provided with, between the drill bit and the guiding joint, a guiding support which is arranged to bear against the borehole wall of a borehole.
  • a guiding support which is mounted in accordance with the invention makes the achieved curve radius be in proportion to the angular deflection between the drill- portion centre axis and the string-portion centre axis.
  • the cause is believed to be that the guiding support subjects the relatively weak rock to smaller radial forces than the radial forces that are applied during drilling without the guiding support, and that the rock thereby resists the radial guiding force to which it is subjected.
  • the distance between the drill-portion centre axis and the abutment of the guiding support against the borehole wall may be fixed.
  • a borehole which is drilled by means of a rock- drilling machine of this kind has a relatively constant diameter and it is normally unnecessary to adjust the distance between the drill-portion centre axis and the abutment of the guiding support against the borehole wall.
  • the abutment of the guiding support against the borehole wall may be constituted by a guiding pad.
  • the abutment of the guiding support against the borehole wall may be constituted by a guiding wheel.
  • a guiding wheel is particularly usable when the borehole is to be formed with a relatively small curve radius.
  • a relatively small curve ra- dius is conditional on the angle between the drill-portion centre axis and the string-portion centre axis being relatively large, whereby the force against the borehole wall will be considerable.
  • the abutment of the guiding support may be rotatable around a drive shaft for the drill bit. If the guiding support is arranged between the drill bit and the driving motor of the drill bit, the torque of the drill bit is transmitted by means of the drive shaft which is supported in the guide support. It is not appropriate for the guiding pad or guiding wheel of the guiding support to be co-rotating with the drive shaft.
  • the guiding support may include several guiding pads, or guiding wheels, spaced around the drill-portion centre axis.
  • the guiding support is thereby adapted to receive guiding forces independently of what direction the drill bit is guided in.
  • a guiding support in accordance with the invention solves problems with unreliable guiding of the drill bit in relatively weak rock, which considerably improves the drilling progress in such rock.
  • Figure 1 shows a section of a rock-drilling machine which is provided with a guiding support in accordance with the invention, and which is in a borehole;
  • Figure 2 shows, on a larger scale, the front portion of the rock-drilling machine
  • Figure 3 shows a guiding support in perspective and on a further enlarged scale
  • Figure 4 a section III-III of figure 3.
  • the reference numeral 1 indicates a portion of a rock-drilling machine which is in a borehole 2, the rock-drilling machine 1 including a drill portion 4 and a string portion 6, the drill portion 4 and the string portion 6 being interconnected by means of a guiding joint 8.
  • the drill portion 4 includes a drill bit 10, a gear 12 and a driving motor 14 for the drill bit 10, and a guiding support 16 which is arranged between the gear 12 and the drill bit 10.
  • the string portion 6 includes a hydraulic section 18 and an electrosection 20 and pipe lengths 22 joined together, together forming a pipe string 24, the pipe string 24 projecting from the borehole 2 to a feeding device, not shown.
  • the drill portion 4 has a drill-portion centre axis 26 and the string portion 6 has a string-portion centre axis 28.
  • the string-portion centre axis 28 may be curved along the pipe string 24. Reference to the string-portion centre axis 28 refers to the direction it has at the guiding joint 8. In figure 1, the drill-portion centre axis 26 takes an angle ⁇ to the string-portion centre axis 28. The drill bit 10 is thereby directed somewhat upwards relative to the string- portion centre axis 28.
  • the guiding support 16 is formed with a centric drive shaft 30 which, on its end portion facing the drill bit 10, is provided with a first mounting flange 32 which complementarily fits and is bolted to the drill bit 10, and the guiding support 16 is provided with, on its opposite end portion, a second mounting flange 34 which complementarily fits and is bolted to the gear 12, see figure 4.
  • the mounting flanges 32, 34 are connected to the drive shaft 30 by means of bolt connections 36.
  • a centric opening 38 extending through the drive shaft 30 and the mounting flanges 32, 34 enables the supply of drilling fluid to the drill bit 10.
  • a wheel frame 40 surrounds the drive shaft 30.
  • the wheel frame 40 is designed to hold a number of guiding wheels 42 spaced around the drill-portion centre axis 26.
  • Each guiding wheel 42 is supported on a wheel axle 44, each wheel axle 44 being connected to a wheel bridge 46 on either side of the guiding wheel 42.
  • the wheel bridges 46 and a spacer sleeve 48 span between two bearing housings 50.
  • a bearing 52 surrounding the drive shaft 30 is placed in each of the bearing housings 50, and the wheel frame 40 is thereby arranged to rotate freely around the drive shaft 30.
  • Each of the bearing housings 50 is formed with a seal 54 sealingly bearing against the first mounting flange 32 and the second mounting flange 34, respectively.
  • the guiding wheels 42 have a relatively small clearance to the borehole wall 56 of the borehole 2.
  • one or a pair of the guiding wheels 42 may bear lightly against the borehole wall 56.
  • the drill portion 4 is rotated around the guiding support 16 so that the drill portion 4 takes a position as indicated by means of dashed lines in figure 2.
  • the guide wheel (s) 42 which is (are) on the opposite side of the new direction of the drill-portion centre axis 26' receive a considerable radial force which is transmitted to the borehole wall 56.
  • the directional change is made gradually during the progress and the loaded guiding wheels 42 roll on the borehole wall 56 while the torque from the gear 12 is transmitted to the drill bit 10 via the drive shaft 30 and the mounting flanges 32, 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

A guiding device for a rock-drilling machine (1), the rock-drilling machine (1) including a drill portion (4) with a drill bit (10) and a drill-portion centre axis (26), and a string portion (6) with a string-portion centre axis (28), the drill-portion (4) and the string-portion (6) being inter-connected by means of a guiding joint (8), and the drill portion (4) being provided with, between the drill bit (10) and the guiding joint (8), a guiding support (16) which is arranged to bear against the borehole wall (56) of a borehole (2).

Description

GUIDING DEVICE FOR ROCK DRILLING MACHINE
This invention relates to a guiding device for a rock- drilling machine. More particularly, it relates to a guiding device for a rock-drilling machine, the rock-drilling machine including a drill portion with a drill bit which has a drill - portion centre axis, and a string portion with a string- portion centre axis, the drill portion and the string portion being interconnected by means of a guiding joint.
Rock-drilling machines of the kind initially mentioned may be connected by means of a pipe string to a driving device on the outside of a rock that is being drilled. The rock- drilling machine is guided while it is being moved in a borehole, by turning the guiding joint in such a way that the drill-portion centre axis takes an angle relative to the string-portion centre axis.
The guiding joint is designed to change the angle between said centre axes in any direction and is additionally arranged to transmit the torque from the drill bit.
When relatively hard rock is being drilled, directional con- trol functions by means of a guiding joint as assumed. During drilling in weaker rock, however, it has turned out that the radius of curvature that is achieved in the borehole is not in proportion to the angular deflection between the drill- portion centre axis and the string-portion centre axis. The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved in accordance with the invention through the features which are specified in the description below and in the claims that follow.
A guiding device for a rock-drilling machine is provided, the rock-drilling machine including a drill portion with a drill bit which has a drill-portion centre axis, and a string portion with a string-portion centre axis, the drill portion and the string portion being interconnected by means of a guiding joint. The guiding device is characterized by the drill portion being provided with, between the drill bit and the guiding joint, a guiding support which is arranged to bear against the borehole wall of a borehole.
It has surprisingly been found that when relatively weak rock is being drilled, a guiding support which is mounted in accordance with the invention makes the achieved curve radius be in proportion to the angular deflection between the drill- portion centre axis and the string-portion centre axis. The cause is believed to be that the guiding support subjects the relatively weak rock to smaller radial forces than the radial forces that are applied during drilling without the guiding support, and that the rock thereby resists the radial guiding force to which it is subjected.
The distance between the drill-portion centre axis and the abutment of the guiding support against the borehole wall may be fixed. A borehole which is drilled by means of a rock- drilling machine of this kind has a relatively constant diameter and it is normally unnecessary to adjust the distance between the drill-portion centre axis and the abutment of the guiding support against the borehole wall. The abutment of the guiding support against the borehole wall may be constituted by a guiding pad. When the borehole is to be formed with a relatively large curve radius, it may be appropriate to use a guiding pad, as the force between the guiding pad and the borehole wall is relatively small.
The abutment of the guiding support against the borehole wall may be constituted by a guiding wheel. A guiding wheel is particularly usable when the borehole is to be formed with a relatively small curve radius. A relatively small curve ra- dius is conditional on the angle between the drill-portion centre axis and the string-portion centre axis being relatively large, whereby the force against the borehole wall will be considerable.
The abutment of the guiding support may be rotatable around a drive shaft for the drill bit. If the guiding support is arranged between the drill bit and the driving motor of the drill bit, the torque of the drill bit is transmitted by means of the drive shaft which is supported in the guide support. It is not appropriate for the guiding pad or guiding wheel of the guiding support to be co-rotating with the drive shaft.
The guiding support may include several guiding pads, or guiding wheels, spaced around the drill-portion centre axis. The guiding support is thereby adapted to receive guiding forces independently of what direction the drill bit is guided in.
A guiding support in accordance with the invention solves problems with unreliable guiding of the drill bit in relatively weak rock, which considerably improves the drilling progress in such rock.
In what follows is described an example of a preferred em- bodiment which is visualized in the accompanying drawings, in which:
Figure 1 shows a section of a rock-drilling machine which is provided with a guiding support in accordance with the invention, and which is in a borehole;
Figure 2 shows, on a larger scale, the front portion of the rock-drilling machine;
Figure 3 shows a guiding support in perspective and on a further enlarged scale; and
Figure 4 a section III-III of figure 3.
In the drawings, the reference numeral 1 indicates a portion of a rock-drilling machine which is in a borehole 2, the rock-drilling machine 1 including a drill portion 4 and a string portion 6, the drill portion 4 and the string portion 6 being interconnected by means of a guiding joint 8.
The drill portion 4 includes a drill bit 10, a gear 12 and a driving motor 14 for the drill bit 10, and a guiding support 16 which is arranged between the gear 12 and the drill bit 10. The string portion 6 includes a hydraulic section 18 and an electrosection 20 and pipe lengths 22 joined together, together forming a pipe string 24, the pipe string 24 projecting from the borehole 2 to a feeding device, not shown.
The drill portion 4 has a drill-portion centre axis 26 and the string portion 6 has a string-portion centre axis 28. The string-portion centre axis 28 may be curved along the pipe string 24. Reference to the string-portion centre axis 28 refers to the direction it has at the guiding joint 8. In figure 1, the drill-portion centre axis 26 takes an angle α to the string-portion centre axis 28. The drill bit 10 is thereby directed somewhat upwards relative to the string- portion centre axis 28.
In this preferred exemplary embodiment, the guiding support 16 is formed with a centric drive shaft 30 which, on its end portion facing the drill bit 10, is provided with a first mounting flange 32 which complementarily fits and is bolted to the drill bit 10, and the guiding support 16 is provided with, on its opposite end portion, a second mounting flange 34 which complementarily fits and is bolted to the gear 12, see figure 4. The mounting flanges 32, 34 are connected to the drive shaft 30 by means of bolt connections 36. A centric opening 38 extending through the drive shaft 30 and the mounting flanges 32, 34 enables the supply of drilling fluid to the drill bit 10.
A wheel frame 40 surrounds the drive shaft 30. The wheel frame 40 is designed to hold a number of guiding wheels 42 spaced around the drill-portion centre axis 26. Each guiding wheel 42 is supported on a wheel axle 44, each wheel axle 44 being connected to a wheel bridge 46 on either side of the guiding wheel 42.
The wheel bridges 46 and a spacer sleeve 48 span between two bearing housings 50. A bearing 52 surrounding the drive shaft 30 is placed in each of the bearing housings 50, and the wheel frame 40 is thereby arranged to rotate freely around the drive shaft 30. Each of the bearing housings 50 is formed with a seal 54 sealingly bearing against the first mounting flange 32 and the second mounting flange 34, respectively.
The operation of the rock-drilling machine 1 beyond the inventive features is known to a person skilled in the art and is not described in further detail.
During rectilinear drilling as it is illustrated in figure 2, the guiding wheels 42 have a relatively small clearance to the borehole wall 56 of the borehole 2. Alternatively, one or a pair of the guiding wheels 42 may bear lightly against the borehole wall 56.
As the direction of the drill -portion centre axis 26 is changed, as it is indicated by the reference numeral 26' in figure 2, the drill portion 4 is rotated around the guiding support 16 so that the drill portion 4 takes a position as indicated by means of dashed lines in figure 2. The guide wheel (s) 42 which is (are) on the opposite side of the new direction of the drill-portion centre axis 26' receive a considerable radial force which is transmitted to the borehole wall 56.
The directional change is made gradually during the progress and the loaded guiding wheels 42 roll on the borehole wall 56 while the torque from the gear 12 is transmitted to the drill bit 10 via the drive shaft 30 and the mounting flanges 32, 34.

Claims

P a t e nt c l a i m s
1. A guiding device for a rock-drilling machine (1), the rock-drilling machine (1) including a drill portion (4) with a drill bit (10) , which has a drill-portion centre axis (26) , and a string portion (6) with a string- portion centre axis (28) , the drill-portion (4) and the string-portion (6) being interconnected by means of a guiding joint (8) , and the drill portion (4) being provided with, between the drill bit (10) and the guiding joint (8) , a guiding support (16) which is arranged to bear against the borehole wall (56) of a borehole (2) , characterized in that the guiding support (16) is provided with a supported drive shaft (30) extending through it for the drill bit (10) .
2. The guiding device in accordance with claim 1, c h ar a c t e r i z e d i n that the distance between the drill-portion centre axis (26) -,and the abutment of the guiding support (16) against the borehole wall (56) is fixed.
3. The guiding device in accordance with claim 1, c h ar a c t e r i z e d i n that the abutment of the guiding support (16) against the borehole wall (56) is constituted by a guiding pad.
4. The guiding device in accordance with claim 1, c h a- r a c t e r i z e d i n that the abutment of the guiding support (16) against the borehole wall (56) is constituted by a guiding wheel (42) .
5. The guiding device in accordance with claims 3 and 4, c h a r a c t e r i z e d i n that the guiding sup- port (16) includes several guiding pads or guiding wheels (42) spaced around the drill-portion centre axis (26) .
PCT/NO2010/000157 2009-05-06 2010-04-29 Guiding device for rock drilling machine WO2010128861A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10772302.5A EP2427623B1 (en) 2009-05-06 2010-04-29 Guiding device for rock drilling machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20091795A NO333280B1 (en) 2009-05-06 2009-05-06 Control device for rock drill.
NO20091795 2009-05-06

Publications (1)

Publication Number Publication Date
WO2010128861A1 true WO2010128861A1 (en) 2010-11-11

Family

ID=43050232

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000157 WO2010128861A1 (en) 2009-05-06 2010-04-29 Guiding device for rock drilling machine

Country Status (3)

Country Link
EP (1) EP2427623B1 (en)
NO (1) NO333280B1 (en)
WO (1) WO2010128861A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3735514A4 (en) * 2018-01-02 2021-12-08 Norhard Asset AS Device at tunnel boring machine arranged for drilling operations without operators in the borehole

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5220963A (en) 1989-12-22 1993-06-22 Patton Consulting, Inc. System for controlled drilling of boreholes along planned profile
NO300787B1 (en) * 1988-12-30 1997-07-21 Inst Francais Du Petrole Device for drilling in controlled path
US5649603A (en) * 1992-05-27 1997-07-22 Astec Developments Limited Downhole tools having circumferentially spaced rolling elements
WO2004011766A1 (en) 2002-07-25 2004-02-05 Etudes & Productions Schlumberger Drilling method
US20050098353A1 (en) * 2003-11-07 2005-05-12 Halliburton Energy Services, Inc. Variable gauge drilling apparatus and method of assembly thereof
US20080142268A1 (en) 2006-12-13 2008-06-19 Geoffrey Downton Rotary steerable drilling apparatus and method

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EP0085444B1 (en) * 1982-02-02 1985-10-02 Shell Internationale Researchmaatschappij B.V. Method and means for controlling the course of a bore hole
DE3403239C1 (en) * 1984-01-31 1985-06-27 Christensen, Inc., Salt Lake City, Utah Devices for optional straight or directional drilling in underground rock formations
GB8708791D0 (en) * 1987-04-13 1987-05-20 Shell Int Research Assembly for directional drilling of boreholes
US5447200A (en) * 1994-05-18 1995-09-05 Dedora; Garth Method and apparatus for downhole sand clean-out operations in the petroleum industry
USRE38418E1 (en) * 1996-02-14 2004-02-10 The Charles Machine Works, Inc. Dual member pipe joint for a dual member drill string
GB9610382D0 (en) * 1996-05-17 1996-07-24 Anderson Charles A Drilling apparatus
GB2396365A (en) * 2002-12-21 2004-06-23 Schlumberger Holdings Apparatus and method for compacting borehole walls
US7204324B2 (en) * 2004-03-03 2007-04-17 Halliburton Energy Services, Inc. Rotating systems associated with drill pipe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO300787B1 (en) * 1988-12-30 1997-07-21 Inst Francais Du Petrole Device for drilling in controlled path
US5220963A (en) 1989-12-22 1993-06-22 Patton Consulting, Inc. System for controlled drilling of boreholes along planned profile
US5649603A (en) * 1992-05-27 1997-07-22 Astec Developments Limited Downhole tools having circumferentially spaced rolling elements
WO2004011766A1 (en) 2002-07-25 2004-02-05 Etudes & Productions Schlumberger Drilling method
US20050098353A1 (en) * 2003-11-07 2005-05-12 Halliburton Energy Services, Inc. Variable gauge drilling apparatus and method of assembly thereof
US20080142268A1 (en) 2006-12-13 2008-06-19 Geoffrey Downton Rotary steerable drilling apparatus and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2427623A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3735514A4 (en) * 2018-01-02 2021-12-08 Norhard Asset AS Device at tunnel boring machine arranged for drilling operations without operators in the borehole

Also Published As

Publication number Publication date
NO333280B1 (en) 2013-04-29
EP2427623A1 (en) 2012-03-14
EP2427623A4 (en) 2017-12-06
NO20091795L (en) 2010-11-08
EP2427623B1 (en) 2019-10-02

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