EP3060742A1 - Drilling device - Google Patents

Drilling device

Info

Publication number
EP3060742A1
EP3060742A1 EP13895833.5A EP13895833A EP3060742A1 EP 3060742 A1 EP3060742 A1 EP 3060742A1 EP 13895833 A EP13895833 A EP 13895833A EP 3060742 A1 EP3060742 A1 EP 3060742A1
Authority
EP
European Patent Office
Prior art keywords
drilling
bit
pilot bit
groove
drilling device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13895833.5A
Other languages
German (de)
French (fr)
Other versions
EP3060742A4 (en
EP3060742B1 (en
Inventor
Hannu Paasonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRI MACH Oy
Tri-Mach Oy
Original Assignee
TRI MACH Oy
Tri-Mach Oy
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 TRI MACH Oy, Tri-Mach Oy filed Critical TRI MACH Oy
Publication of EP3060742A1 publication Critical patent/EP3060742A1/en
Publication of EP3060742A4 publication Critical patent/EP3060742A4/en
Application granted granted Critical
Publication of EP3060742B1 publication Critical patent/EP3060742B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • 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
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Definitions

  • the invention relates to a drilling device which comprises a pilot bit drilling a middle portion of a hole, to said bit detachable fastened ring bit said bit drilling outer circle of the hole, as well as an arrangement for pulling a casing tube into said hole during drilling, wherein in the drilling situation both the pilot bit and the ring bit are fitted to be rotated and the casing tube fitted to be unrotatable, and for removing drilling waste from drilled surface locating at front side of said bits, the drilling device comprises a flushing system, by means of which flushing medium is lead via the pilot bit to the drilling surface and returned therefrom into a flow space locating inside the casing tube.
  • Characteristics for the drilling device according to the invention is that the flushing medium flow has been by means of a channel system turned inside the pilot bit to a flow which is flowing in side direction, arranged to run a portion a inside the pilot bit in the said side direction before the flow will run in the groove on the surface of the pilot bit, which groove is open towards the drilled surface.
  • Characteristics for the pilot bit belonging to the drilling device according to the invention is that the pilot bit is designed to function by means of rotation motion and edges locating in the drilling surface and directed towards the rotation direction as a cutting edge which cuts the drilled surface during earth boring, wherein said edges are arranged to meet the drilled surface essentially first.
  • pressurized flushing flow does not hit the drilled surface but flows in horizontal direction towards the inner surface of the ring bit, wherein its effect upon the drilled surface is essentially weakened.
  • Drilling waste can, however, in same way as in known solutions flow with the flushing medium and together go away inside the casing tube.
  • soil drilling grooves have been formed in the pilot bit and cutting edges in their back portions seen in the rotation direction of the bit, wherein soil loosened by said edges moves into said groove and further therefrom into the flushing channels. Soil is not uncontrolled loosened from the area outside the hole.
  • Figure 1 shows a partial section view of a drilling device seen from side.
  • Figure 2 shows drilling device of the figure 1 seen from front.
  • Figure 3 shows another drilling device seen from front.
  • Figure 4 shows section A - A.
  • a pilot bit 1 which drills center part of a hole middle and a ring bit 2 which drills the outer circle of the hole and is detachable, like via bayonet coupling fastened to the pilot bit.
  • Casing tube 4 is pulled into the hole during drilling by means of the pilot bit 1, which bit is hammering to a ring-like casing shoe 3.
  • the casing shoe 3 has been welded to the casing tube 4 and therefore the casing shoe finally pulls the casing tube 4 into the hole.
  • Flushing medium like pressurized air, is lead via center hole 8 in the pilot bit 1 towards the top of the pilot bit 1, but this channel ends a little before the front surface of the pilot bit 1.
  • This solution has, however, very small hole 9 drilled through.
  • the hole 9 is not necessary for the invention at all and can be left undrilled.
  • the hole has for example thread, wherein a lift hook can be fastened to said hole, when the bit is handled.
  • Nearly whole flushing flow is turned in the pilot bit 1 according to the invention to horizontal direction and continues in a round channel 6 in side direction.
  • the channel 6 is opened after a distance being open of its upper portion, wherein drilling waste can move from the drilled surface and to join to flushing medium.
  • the flushing medium jet is not in any stage directed towards the drilled surface towards the drilled soil.
  • 6 in the pilot bit 1 is a hole 6 from its first portion as long as the flushing medium jet will get motion in horizontal direction.
  • the distance is for example about 2 - 3 times the diameter of the hole 6. If it is drilled soft soil, at least the flushing medium jet does not loosen too much soil with it, because the jet hits mainly to the inner surface of the ring bit 2, from where the jet continues via the channel 7 back inside the casing tube 4.
  • Figure 2 shows a drilling device seen from front and section view of the flushing groove 5, 6 from line A - A.
  • the flushing groove which comes via center hole 8 in the pilot bit 1 is divided in this drilling device into five horizontal directed holes 6 and grooves 5, 6 which are following said holes.
  • the hole 6 is forming the bottom part of the groove along the whole portion in the pilot bit 1, but the hole changes to a groove which is open upwards due to another groove 5 which has been machined above it.
  • the groove 5 has been made widening when it continues towards the outer edge of the pilot bit 1. This helps access of the flushing medium into the groove 5, 6 because there is also more produced waste in front of the pilot bit 1 when going towards its outer edge.
  • a pilot bit 1 whose drilling surface comprises only two grooves 5 and two into horizontal direction turned flushing groove 6.
  • the grooves 5 are wide and especially in soil drilling they receive soil which has loosened from the drilled surface. Soil can be loosened from the drilled surface when cutting edges 11 have been formed in the pilot bit 1 in the rear edge of the grooves 5.
  • the edges 11 are cutting the drilled surface when the pilot bit 1 rotates though they locates in the same level with the drilling surface in the pilot bit 1, because there is also advance motion for the bits 1, 2 towards the drilled surface.
  • the cutting edges 11 can be in the drilling surface a little lifted up, as section A - A shows, when the drilling surface has been made slanted surface in angle a so, that edge 11 cuts the drilled surface also with a little advance motion. Angle a is advantageous little for example 5 - 15 °.
  • the ring bit 2 pushes soil a little outside the hole and this soil at least partly flows with the flushing air into the channel 7. The flushing air cannot flow to space outside the hole as well as does not loose soil from said space.

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

Drilling device which comprises a pilot bit (1) drilling a middle portion of a hole, to said bit (1) detachable fastened ring bit (2) said bit drilling outer circle of the hole, as well as an arrangement for pulling a casing tube (4) into said hole during drilling, wherein in the drilling situation both the pilot bit (1) and the ring bit (2) are fitted to be rotated and the casing tube (4) fitted to be unrotatable, and for removing drilling waste from drilled surface locating at front side of said bits (1);(2), the drilling device comprises a flushing system, by means of which flushing medium is lead via the pilot bit (1) to the drilling surface and returned therefrom into a flow space (7) locating inside the casing tube (4). The flushing medium flow has been by means of a channel system (8, 6) turned inside the pilot bit (1) to a flow which is flowing in side direction, arranged to run a portion (a) inside the pilot bit (1) in the said side direction before the flow will run in the groove (5, 6) on the surface of the pilot bit (1), which groove is open towards the drilled surface.

Description

DRILLING DEVICE
The invention relates to a drilling device which comprises a pilot bit drilling a middle portion of a hole, to said bit detachable fastened ring bit said bit drilling outer circle of the hole, as well as an arrangement for pulling a casing tube into said hole during drilling, wherein in the drilling situation both the pilot bit and the ring bit are fitted to be rotated and the casing tube fitted to be unrotatable, and for removing drilling waste from drilled surface locating at front side of said bits, the drilling device comprises a flushing system, by means of which flushing medium is lead via the pilot bit to the drilling surface and returned therefrom into a flow space locating inside the casing tube.
Earlier is known drilling devices which drills a hole according to preamble above among others from publications WO 9813575 and WO 9618798. In these ones pressurized flushing medium flows direct or inclined towards drilled surface. When soft soil is drilled a high flushing flow removes soil possible from larger hole diameter area than the final drill hole has. This kind of extra hole enlargement is neither allowed in the pile drillings nor in many horizontal drilling cases. The pilot bits described in the above mentioned publications have flat drilling surfaces and they do not try in the earth drilling to loosen material from drilled surface, contrary even may tighten it.
For removing this disadvantage a new drilling device has been developed by means of which device the above described problem is avoided. Characteristics for the drilling device according to the invention is that the flushing medium flow has been by means of a channel system turned inside the pilot bit to a flow which is flowing in side direction, arranged to run a portion a inside the pilot bit in the said side direction before the flow will run in the groove on the surface of the pilot bit, which groove is open towards the drilled surface.
Characteristics for the pilot bit belonging to the drilling device according to the invention is that the pilot bit is designed to function by means of rotation motion and edges locating in the drilling surface and directed towards the rotation direction as a cutting edge which cuts the drilled surface during earth boring, wherein said edges are arranged to meet the drilled surface essentially first.
Advantageous for the invention is that pressurized flushing flow does not hit the drilled surface but flows in horizontal direction towards the inner surface of the ring bit, wherein its effect upon the drilled surface is essentially weakened. Drilling waste can, however, in same way as in known solutions flow with the flushing medium and together go away inside the casing tube. For improving soil drilling grooves have been formed in the pilot bit and cutting edges in their back portions seen in the rotation direction of the bit, wherein soil loosened by said edges moves into said groove and further therefrom into the flushing channels. Soil is not uncontrolled loosened from the area outside the hole.
In the following the invention is closer described by referring to accompanying drawings, where
Figure 1 shows a partial section view of a drilling device seen from side.
Figure 2 shows drilling device of the figure 1 seen from front.
Figure 3 shows another drilling device seen from front.
Figure 4 shows section A - A. In the figure 1 there is as bits for the drilling device a pilot bit 1 which drills center part of a hole middle and a ring bit 2 which drills the outer circle of the hole and is detachable, like via bayonet coupling fastened to the pilot bit. Casing tube 4 is pulled into the hole during drilling by means of the pilot bit 1, which bit is hammering to a ring-like casing shoe 3. The casing shoe 3 has been welded to the casing tube 4 and therefore the casing shoe finally pulls the casing tube 4 into the hole.
Flushing medium, like pressurized air, is lead via center hole 8 in the pilot bit 1 towards the top of the pilot bit 1, but this channel ends a little before the front surface of the pilot bit 1. This solution has, however, very small hole 9 drilled through. The hole 9 is not necessary for the invention at all and can be left undrilled. The hole has for example thread, wherein a lift hook can be fastened to said hole, when the bit is handled. Nearly whole flushing flow is turned in the pilot bit 1 according to the invention to horizontal direction and continues in a round channel 6 in side direction. The channel 6 is opened after a distance being open of its upper portion, wherein drilling waste can move from the drilled surface and to join to flushing medium. The flushing medium jet is not in any stage directed towards the drilled surface towards the drilled soil.
In side direction locating groove 5, 6 in the pilot bit 1 is a hole 6 from its first portion as long as the flushing medium jet will get motion in horizontal direction. The distance is for example about 2 - 3 times the diameter of the hole 6. If it is drilled soft soil, at least the flushing medium jet does not loosen too much soil with it, because the jet hits mainly to the inner surface of the ring bit 2, from where the jet continues via the channel 7 back inside the casing tube 4.
Figure 2 shows a drilling device seen from front and section view of the flushing groove 5, 6 from line A - A. The flushing groove which comes via center hole 8 in the pilot bit 1 is divided in this drilling device into five horizontal directed holes 6 and grooves 5, 6 which are following said holes. The hole 6 is forming the bottom part of the groove along the whole portion in the pilot bit 1, but the hole changes to a groove which is open upwards due to another groove 5 which has been machined above it. The groove 5 has been made widening when it continues towards the outer edge of the pilot bit 1. This helps access of the flushing medium into the groove 5, 6 because there is also more produced waste in front of the pilot bit 1 when going towards its outer edge.
In the figure 3 there is shown a pilot bit 1, whose drilling surface comprises only two grooves 5 and two into horizontal direction turned flushing groove 6. The grooves 5 are wide and especially in soil drilling they receive soil which has loosened from the drilled surface. Soil can be loosened from the drilled surface when cutting edges 11 have been formed in the pilot bit 1 in the rear edge of the grooves 5. The edges 11 are cutting the drilled surface when the pilot bit 1 rotates though they locates in the same level with the drilling surface in the pilot bit 1, because there is also advance motion for the bits 1, 2 towards the drilled surface.
The cutting edges 11 can be in the drilling surface a little lifted up, as section A - A shows, when the drilling surface has been made slanted surface in angle a so, that edge 11 cuts the drilled surface also with a little advance motion. Angle a is advantageous little for example 5 - 15 °. Thus it is secured that soil is loosened from the drilled surface. The ring bit 2 pushes soil a little outside the hole and this soil at least partly flows with the flushing air into the channel 7. The flushing air cannot flow to space outside the hole as well as does not loose soil from said space. There is also a cutting edge 11 in the pilot bit 1 in the figure 2, which edge is cutting soil from the drilled surface, said soil then moves into the groove 5 and further into the channel 7. Also in this pilot bit 1 the cutting edge 11 can be a little lifted up compared with the other drilling surface.

Claims

1. Drilling device which comprises a pilot bit (1) drilling a middle portion of a hole, to said bit (1) detachable fastened ring bit (2) said bit drilling outer circle of the hole, as well as an arrangement for pulling a casing tube (4) into said hole during drilling, wherein in the drilling situation both the pilot bit (1) and the ring bit (2) are fitted to be rotated and the casing tube (4) fitted to be unrotatable, and for removing drilling waste from drilled surface locating at front side of said bits (1);(2), the drilling device comprises a flushing system, by means of which flushing medium is lead via the pilot bit (1) to the drilling surface and returned therefrom into a flow space (7) locating inside the casing tube (4), characterized in that the flushing medium flow has been by means of a channel system (8, 6) turned inside the pilot bit (1) to a flow which is flowing in side direction, arranged to run a portion (a) inside the pilot bit (1) in the said side direction before the flow will run in the groove (5, 6) on the surface of the pilot bit (1), which groove is open towards the drilled surface.
2. Drilling device according to claim 1, characterized in that the groove (5, 6) locating on the surface of the pilot bit (1) has been lead towards the ring bit (2) so, that the groove (5, 6) meets a channel (7) leading rearwards from the drilling surface.
3. Drilling device according to claim 1, characterized in that at least bottom of the groove (5, 6) is round of its cross section.
4. Drilling device according to claim 1, characterized in that the flushing channel in the pilot bit (1) when locating as turned to horizontal direction is arranged to be a round channel of its first portion.
5. Drilling device according to claim 1, characterized in that the groove (5, 6) locating on the surface of the pilot bit (1) is designed to function by means of rotation motion and edges (11) locating in the drilling surface and directed towards the rotation direction as a cutting edge which cuts the drilled surface during earth boring, wherein said edges (11) are arranged to meet the drilled surface essentially first.
6. Drilling device according to claim 5, characterized in that the drilling surface of the pilot bit (1) comprises grooves (5) in front of the cutting edges (11) seen in the rotation direction, said grooves (5) are receiving loosened material and being part of an arrangement, via which cut, loosened from drilled surface or by cutting loosened material is lead back via flushing channels (7).
7. Drilling device according to claim 5, characterized in that the drilling surface of the pilot bit (1) is arranged to be a slanted surface in angle (a) so that edge (11) in the drilling situation locates as the foremost in the drilling surface.
8. Drilling device according to claim 5, characterized in that in the drilling surface of the pilot bit (1) is arranged a groove (5) before the cutting edge (11), wherein the advance motion given to the pilot bit (1) and rotation of the bit move the edge (11) to cut the drilled surface.
EP13895833.5A 2013-10-22 2013-10-22 Drilling device Active EP3060742B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2013/000041 WO2015059341A1 (en) 2013-10-22 2013-10-22 Drilling device

Publications (3)

Publication Number Publication Date
EP3060742A1 true EP3060742A1 (en) 2016-08-31
EP3060742A4 EP3060742A4 (en) 2017-06-14
EP3060742B1 EP3060742B1 (en) 2019-01-30

Family

ID=52992319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13895833.5A Active EP3060742B1 (en) 2013-10-22 2013-10-22 Drilling device

Country Status (2)

Country Link
EP (1) EP3060742B1 (en)
WO (1) WO2015059341A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3256681B1 (en) * 2015-02-13 2018-08-29 Oy Epiroc Drilling Tools AB Down-the-hole drilling device
CA2987794C (en) 2015-06-24 2023-08-08 Epiroc Canada Inc. Core barrel head assembly with safety overshot
WO2017162909A1 (en) 2016-03-22 2017-09-28 Oy Atlas Copco Rotex Ab Down-the-hole drilling device
CN107448142B (en) * 2017-09-25 2023-06-20 湖北五环欧科制造技术有限公司 Clamping ring with stress relieving part

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995034740A1 (en) * 1994-06-10 1995-12-21 Ilomaeki Valto Drilling apparatus
FI96356C (en) 1994-12-13 1999-12-18 Valto Ilomaeki Drilling method and blade assembly to implement the method
GB9502378D0 (en) * 1995-02-07 1995-03-29 Astec Dev Ltd Lateral jetting
US6209665B1 (en) 1996-07-01 2001-04-03 Ardis L. Holte Reverse circulation drilling system with bit locked underreamer arms
WO1998013575A1 (en) 1996-09-25 1998-04-02 Ilomaeki Valto Bit assembly
US5839519A (en) 1996-11-08 1998-11-24 Sandvik Ab Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment
DE29912404U1 (en) 1999-07-15 1999-09-09 Herrenknecht AG, 77963 Schwanau Drilling device
FI20010699A0 (en) * 2001-04-04 2001-04-04 Jorma Jaervelae Method of drilling and drilling
FR2889556B1 (en) 2005-08-04 2007-09-21 Gerard Arsonnet DEVICE FOR DRILLING A WELL FOLLOWING A DRILLING AXIS FOR MEASURING A PARAMETER OF A PART OF A GROUND
SE533272C2 (en) * 2008-12-18 2010-08-03 Sandvik Intellectual Property Drilling tool for striking rock drilling and consumable kits, ring drill bit and impact shoe for this

Also Published As

Publication number Publication date
EP3060742A4 (en) 2017-06-14
WO2015059341A1 (en) 2015-04-30
EP3060742B1 (en) 2019-01-30

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