EP3433463B1 - Abwärtsbohrvorrichtung - Google Patents

Abwärtsbohrvorrichtung Download PDF

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Publication number
EP3433463B1
EP3433463B1 EP17769509.5A EP17769509A EP3433463B1 EP 3433463 B1 EP3433463 B1 EP 3433463B1 EP 17769509 A EP17769509 A EP 17769509A EP 3433463 B1 EP3433463 B1 EP 3433463B1
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EP
European Patent Office
Prior art keywords
drilling
hole
protrusion
assembly
drilling device
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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.)
Active
Application number
EP17769509.5A
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English (en)
French (fr)
Other versions
EP3433463A4 (de
EP3433463A1 (de
Inventor
Kai Gylling
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.)
Tercope Finland Oy
Original Assignee
Terraroc Findland Oy
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Publication of EP3433463A1 publication Critical patent/EP3433463A1/de
Publication of EP3433463A4 publication Critical patent/EP3433463A4/de
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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
    • E21B10/64—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
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids

Definitions

  • the invention relates to a down-the-hole drilling device according to the preamble of the independent claim directed thereto.
  • a drilling head in a drilling unit of the drilling apparatus that exists inside a casing pipe or in other words a so called earth pipe or casing pipe presented in this patent is formed of a first frame part and an annular second frame part, the drilling surfaces of which being provided with drilling organs, such as drill bits or like, of the first and second drilling means or in other words of a center drill or a pilot and a reaming drill or a reamer.
  • the first frame part forming the pilot is being released from the second frame part forming the reamer, in order to pull the same alone off from a drilled hole after the drilling situation.
  • the solution in question is provided with an arrangement, which locks the said drilling means together for a drilling situation unrotatively in respect with each other and in both directions longitudinally, in which context as an advantageous embodiment e.g. a bayonet coupling has been used.
  • the drilling device according to the above mentioned patent has proved very efficient in practise and also very easy to be adjusted for different kinds of drilling purposes.
  • the kind of drilling devices of this type or so called drill bits are widely used successfully.
  • the drilling surface of drill bits of customary type are especially designed for drilling rock, which is a disadvantage when a drill bit will mainly be used for drilling different kinds of soil layers other than rock.
  • a rock drill bit design is especially poor when drilling in hard clay and sand, because the impact will only reflect backwards in the drill bit due to a large and flat drilling surface thereof.
  • a consequence of the above is that the penetration is slow, and the echoing impact energy has the tendency to break the drill bit.
  • WO 2015/059341 discloses a drilling device that is meant for drilling to be performed for the installation of a casing pipe, wherein the drilling device comprises in its drilling head a drilling arrangement having first drilling means for drilling a center a center hole and second drilling means for reaming the center hole for the casing pipe.
  • the drilling device comprises one or more longitudinal return flow channels on the side surface of the first drilling means for removing drilling waste between the first and second drilling means inside the casing pipe.
  • the drilling device comprises a recess on the drilling surface of the first drilling means, on the bottom of which there exists a groove of the flushing channel assembly of the feed flow arrangement, being arranged perpendicular to the central feed flow channel of the flushing medium.
  • US 4, 538, 691 comprises a rotary drill bit that includes a cutting face having peripheral edge and a central recess, wherein a plurality of fluid discharge nozzles are mounted in the cutting face. Respectively a plurality of cutter elements are mounted in the peripheral edge and in the recess to fracture an earthen core formed as the drill cuts through a formation.
  • This solution is not meant for the installation of a casing pipe, which is why it doesn't comprise second drilling means to ream the hole for the casing pipe.
  • the down-the-hole drilling device according to the present invention is mainly characterized by what has been presented in the characterizing part of the independent claim directed thereto.
  • One benefit of the present invention is also the very easy manufacturing of drill bits provided with the protrusions according to the invention, while, however, in principle customary drill bits can still be used without major modifications.
  • the protrusions can easily be machined, processed or installed onto the drilling surface of the pilot during normal manufacturing process thereof, wherein no additional manufacturing steps are needed.
  • a drilling device of basically customary type can be significantly improved, which enables efficient use of the drill bit in every soil type or ground condition etc. Thanks to the invention, there is not a need for different types of drill bits for different ground conditions or soil types in order to drill efficiently. Moreover the increased efficiency will lower the cost per drill meter by enabling finishing the hole faster. This will also save time for the end user, lower fuel consumption during the drilling and cut down CO 2 emissions.
  • the invention relates to a down-the-hole drilling device 1 for drilling to be performed with a casing pipe 2, wherein the drilling device comprises in its drilling head I with reference to figure 2 : a drilling arrangement having first drilling means 4 for drilling a center hole and second drilling means 5 for reaming the center hole for the casing pipe 2; and a flushing flow arrangement 6 for feeding of a pressurized flushing medium onto a drilling surface P of the drilling arrangement by a feed flow arrangement 6a and for discharging the same from the drilling surface together with drilling waste backwards with respect to the drilling direction by an exhaust flow arrangement 6b.
  • the casing pipe 2 is arranged to be pulled into the hole to be drilled by power influence F directed thereto from the drilling arrangement.
  • the feed flow arrangement 6a is arranged to lead the flushing medium for drilling onto the drilling surface P1 of the first drilling means 4 at a flushing channel assembly 6a1 therein in essentially radial direction r.
  • the drilling surfaces P1, P2 of the first and second drilling means 4, 5 are provided with cutting inserts 10a submerged therein.
  • the drilling surface P1 of the first drilling means 4 i.e. the pilot comprises a protrusion assembly PT in order to enhance drilling efficiency and to guide drilling waste at the flushing channel assembly 6a1.
  • the drilling head I of the drilling device 1 consists of a first frame part 4a and a second frame part 5a, wherein the drilling surfaces P1, P2 of the first and second drilling means 4, 5 are formed of end surfaces of the frame parts.
  • the essentially rotationally symmetrical first and second drilling means 4, 5 are coupled with each other on the first hand at least during a drilling situation in a power transmitting manner by means of a coupling arrangement, in order to carry out co-operation thereof for a rotational motion, a feeding motion and/or a hammering motion and on the other hand removably in order to enable removal of the first drilling means 4 from a drilled hole.
  • the drilling device is provided with a casing shoe 8 for pulling the casing pipe 2 into the hole by means of a shoulder arrangement L enabling an independent rotational movement of the casing pipe 2 and the drilling device 1 with respect to each other and restricting mutual longitudinal s movement thereof, wherein the exhaust flow arrangement 6b comprises one or more longitudinal s return flow channels 6b' on the side surface of the first drilling means 4 for removing drilling waste between the first and second drilling means 4, 5 inside the casing pipe 2.
  • the first frame part 4a comprises a centric duct 6a" for delivering of the flushing medium therefrom through one or more essentially longitudinal feed channels 6a' onto the drilling surface P1 of the first drilling means 4 at one or more grooves of the flushing channel assembly 6a1, the flow cross section of which gets wider in radial direction r toward the outer periphery of the first frame part 4a.
  • the protrusion assembly PT is arranged in connection with a trailing edge of one or more grooves of the flushing channel assembly 6a1.
  • the trailing edge means, as shown in figure 1b , the rear edge of the grooves with respect to the rotation direction w in drilling.
  • length of the one or more protrusions of the protrusion assembly PT corresponds in a direct (see figures 1b , 3a, 3c ), an angled (see figure 3b ) or an arched manner essentially to the length of the one or more grooves of the flushing channel assembly 6a1.
  • a protrusion of the protrusion assembly PT has a constant cross section perpendicular to its longitudinal direction thereof over the whole length thereof.
  • the embodiments in figures 3b and 3c comprise furthermore supplementary flushing grooves 6a2 on the bottoms of the flushing grooves 6a1.
  • cross section of a protrusion of the protrusion assembly PT perpendicular to its longitudinal direction diminishes toward cutting edge CE thereof.
  • a protrusion of the protrusion assembly PT has rounded or conical cutting edge CE in a plane perpendicular to its longitudinal direction.
  • a protrusion of the protrusion assembly PT comprises essentially narrow protrusions that continue in an arched (see figure 3d ) or in an angled manner uninterruptedly over the center part of the first drilling surface P1 that is free of the flushing grooves 6a1.
  • a protrusion of the protrusion assembly PT is made of or coated with an essentially harder material, like carbide, tungsten carbide, titanium oxide etc., than the drilling head of the drilling device, such as the first frame part 4a.
  • the protrusion assembly may also comprise hard material inserts submerged onto the first frame part's drilling surface or replaceable single part or multi-part protrusions that are installed in place e.g. by pushing them in radial direction by exploiting slide grooves on the drilling surface.
  • the height of the protrusions of the protrusion assembly PT is e.g. between 0,5 - 15 mm and in most common applications typically between 1 - 8 mm.
  • the height of the protrusions in typical applications is, however, essentially lower than the height of the cutting inserts or at least it doesn't exceed the height of the cutting inserts.
  • the drilling device instead of the type of embodiments shown in the drawings, it is naturally possible to use as the drilling device also other drilling devices that are applicable for the same purpose, in which a casing pipe may be exploited in connection with the drilling that is drawn into the ground unrotatively without or with a casing shoe.
  • the casing pipe can naturally also be pulled into the hole ether by the second frame part i.e. the reamer (as in figure 2 ) or by the first frame part i.e. the pilot, in which case the reamer as a "reaming ring", may be situated further back in the longitudinal direction than the reamer presented in figure 2 .
  • the height of the protrusions of the protrusion assembly may vary depending e.g. on the drilling circumstances and on the size of the drilling device, in which context the exemplary limits given above for the height of the protrusions are simply examples of values suitable for most typical drillings.

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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)

Claims (7)

  1. Abwärtsbohrvorrichtung (1) für Bohrungen mit einem Mantelrohr (2), wobei die Bohrvorrichtung in ihrem Bohrkopf (I) eine Bohranordnung mit ersten Bohrmitteln (4) zum Bohren eines zentralen Bohrlochs und zweiten Bohrmitteln (5) zum Erweitern des zentralen Bohrlochs für das Mantelrohr (2) aufweist; und eine Bohrspülvorrichtung (6) zum Zuführen eines unter Druck stehenden Spülmediums auf eine Bohrfläche (P) der Bohranordnung durch eine Zuführvorrichtung (6a) und zum Abführen desselben von der Bohrfläche zusammen mit Bohrklein rückwärts in Bezug auf die Bohrrichtung durch eine Abführvorrichtung (6b), die einen oder mehrere längliche (s) Rückflusskanäle (6b') auf der Seitenfläche der ersten Bohrmittel (4) zum Entfernen von Bohrklein zwischen dem ersten und den zweiten Bohrmitteln (4, 5) innerhalb des Mantelrohrs (2) umfasst, wobei das Mantelrohr (2) so angeordnet ist, dass es durch eine von der Bohranordnung darauf ausgeübte Krafteinwirkung (F) in das zu bohrende Loch gezogen wird, die Zuführvorrichtung (6a) so angeordnet ist, dass sie das Spülmedium zum Bohren im Wesentlichen in radialer Richtung (r) an einer in den ersten Bohrmitteln (4) befindlichen Spülkanalanordnung (6a1) auf eine Bohrfläche (P1) der ersten Bohrmittel (4) führt, und wobei die Bohrflächen (P1) der ersten Bohrmittel (4) und eine Bohrfläche (P2) der zweiten Bohrmittel (5) mit darin versenkten Schneideinsätzen (10a) versehen sind, dadurch gekennzeichnet, dass die Bohrfläche (P1) der ersten Bohrmittel (4) eine Vorsprungsanordnung (PT) mit einem oder mehreren Vorsprüngen umfasst, wobei sich die Vorsprungsanordnung an einer Hinterkante einer oder mehrerer Nuten der Spülkanalanordnung (6a1) befindet, um die Bohrproduktivität durch Einführen des Bohrkleins in die Spülkanalanordnung (6a1) zu verbessern.
  2. Abwärtsbohrvorrichtung nach Anspruch 1, wobei der Bohrkopf (I) der Bohrvorrichtung (1) aus einem ersten Rahmenteil (4a) und einem zweiten Rahmenteil (5a) besteht, wobei die Bohrflächen (P1, P2) der ersten und zweiten Bohrmittel (4, 5) aus Stirnflächen der Rahmenteile gebildet werden, wobei die im Wesentlichen rotationssymmetrischen ersten und zweiten Bohrmittel (4, 5) einerseits zumindest während einer Bohrsituation mittels einer Kopplungsanordnung kraftübertragend miteinander verbunden sind, um deren Zusammenwirken bei einer Dreh-, Vorschub- und/oder Rammbewegung zu bewirken, und andererseits lösbar sind, um das Entfernen der ersten Bohrmittel (4) aus einem Bohrloch zu ermöglichen, wobei die Bohrvorrichtung mit einem Bohrrohrschuh (8) zum Einziehen des Mantelrohrs (2) in das Loch mittels einer Schulteranordnung (L) versehen ist, die eine unabhängige Rotationsbewegung des Mantelrohrs (2) und der Bohrvorrichtung (1) in Bezug zueinander ermöglicht und deren gegenseitige Längsbewegung(en) begrenzt, und wobei das erste Rahmenteil (4a) einen zentrischen Kanal (6a") für das Zuführen des Spülmediums von dort durch einen oder mehrere im Wesentlichen längliche Zufuhrkanäle (6a') auf die Bohrfläche (P1) der ersten Bohrmittel (4) an einer oder mehreren Nuten der Spülkanalanordnung (6a1) umfasst, dessen Strömungsquerschnitt sich in radialer Richtung (r) zum Außenumfang des ersten Rahmenteils (4a) hin erweitert, dadurch gekennzeichnet, dass eine Länge des einen oder der mehreren Vorsprünge der Vorsprungsanordnung (PT) im Wesentlichen der Länge der einen oder der mehreren Nuten der Spülkanalanordnung (6a1) entspricht.
  3. Abwärtsbohrvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Vorsprung der Vorsprungsanordnung (PT) über seine gesamte Länge einen konstanten Querschnitt senkrecht zur Längsrichtung aufweist.
  4. Abwärtsbohrvorrichtung nach einem der vorstehenden Ansprüche 1-2, dadurch gekennzeichnet, dass der Querschnitt des Vorsprungs der Vorsprungsanordnung (PT) senkrecht zur Längsrichtung zu einer Schneidkante (CE) hin abnimmt.
  5. Abwärtsbohrvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Vorsprung der Vorsprungsanordnung (PT) eine abgerundete oder konische Schneidkante (CE) in einer Ebene senkrecht zur Längsrichtung aufweist.
  6. Abwärtsbohrvorrichtung nach einem der vorstehenden Ansprüche 1-5, dadurch gekennzeichnet, dass der Vorsprung der Vorsprungsanordnung (PT) im Wesentlichen schmale Vorsprünge aufweist, die sich ununterbrochen über den mittleren Teil der ersten Bohrfläche (P1) fortsetzen, die frei von Spülrillen (6a1) ist.
  7. Abwärtsbohrvorrichtung nach einem der vorstehenden Ansprüche 1-6, dadurch gekennzeichnet, dass der Vorsprung der Vorsprungsanordnung (PT) aus einem wesentlich härteren Material als der Bohrkopf der Bohrvorrichtung, wie beispielweise das erste Rahmenteil (4a), hergestellt oder damit beschichtet ist.
EP17769509.5A 2016-03-22 2017-02-14 Abwärtsbohrvorrichtung Active EP3433463B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20165233 2016-03-22
PCT/FI2017/050083 WO2017162909A1 (en) 2016-03-22 2017-02-14 Down-the-hole drilling device

Publications (3)

Publication Number Publication Date
EP3433463A1 EP3433463A1 (de) 2019-01-30
EP3433463A4 EP3433463A4 (de) 2019-11-06
EP3433463B1 true EP3433463B1 (de) 2020-07-01

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ID=59901119

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EP17769509.5A Active EP3433463B1 (de) 2016-03-22 2017-02-14 Abwärtsbohrvorrichtung

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EP (1) EP3433463B1 (de)
WO (1) WO2017162909A1 (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1217475A (en) * 1982-09-16 1987-02-03 John D. Barr Rotary drill bits
US4538691A (en) * 1984-01-30 1985-09-03 Strata Bit Corporation Rotary drill bit
GB8418482D0 (en) * 1984-07-19 1984-08-22 Nl Petroleum Prod Rotary drill bits
FI95618C (fi) 1992-12-03 1998-09-03 Jorma Jaervelae Porauslaitteisto
FI103430B (fi) * 1994-10-05 1999-06-30 Valto Ilomaeki Poralaite ja menetelmä reiän poraamiseksi useaan erilaatuiseen maaperä än
WO2013136113A1 (en) * 2012-03-12 2013-09-19 Flexidrill Limited Hybrid drill bit
WO2015059341A1 (en) 2013-10-22 2015-04-30 Tri-Mach Oy Drilling device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2017162909A1 (en) 2017-09-28
EP3433463A4 (de) 2019-11-06
EP3433463A1 (de) 2019-01-30

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