WO1998041726A1 - Dispositif de percussion entraine par du liquide - Google Patents

Dispositif de percussion entraine par du liquide Download PDF

Info

Publication number
WO1998041726A1
WO1998041726A1 PCT/SE1998/000447 SE9800447W WO9841726A1 WO 1998041726 A1 WO1998041726 A1 WO 1998041726A1 SE 9800447 W SE9800447 W SE 9800447W WO 9841726 A1 WO9841726 A1 WO 9841726A1
Authority
WO
WIPO (PCT)
Prior art keywords
hammer piston
liquid
drill
flushing
valve body
Prior art date
Application number
PCT/SE1998/000447
Other languages
English (en)
Inventor
Berndt Ekwall
Andreas Nordbrandt
Original Assignee
Atlas Copco Rock Drills Ab
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 Atlas Copco Rock Drills Ab filed Critical Atlas Copco Rock Drills Ab
Priority to AU64295/98A priority Critical patent/AU728663B2/en
Priority to CA002283447A priority patent/CA2283447C/fr
Publication of WO1998041726A1 publication Critical patent/WO1998041726A1/fr
Priority to SE9902994A priority patent/SE516309C2/sv

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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • the present invention relates to a liquid driven impact device. More particularly the invention relates to an impact device which makes it possible to temporarily achieve continuous flushing of the drill hole at upward drilling.
  • the impact device is also suitable for downward drilling.
  • the present invention which is defined in the subsequent claim, aims at achieving a liquid driven impact device which temporarily makes continuous flushing of the drill hole possible at upward drilling.
  • fig 1 shows the middle part of a liquid driven down-the-hole drilling machine with the hammer piston in impact position.
  • Fig 2 shows the front part of the liquid driven down-the-hole drilling machine with the hammer piston in impact position.
  • Fig 3 shows the middle part of the liquid driven down-the-hole drilling machine with the hammer piston in flushing position.
  • Fig 4 shows the front part of the liquid driven down-the-hole drilling machine with the hammer piston in Hushing position.
  • the embodiment of the invention shown in the drawings is a liquid driven, e.g.
  • a water driven, down-the-hole drilling machine comprising a housing in form of a tube 1 and a split lining 11,12,13 positioned therein and in which a hammer piston 2 is movable to-and-fro for exerting a drill tool 3 to impacts.
  • the hammer piston is journalled in bearings 14,15 which can be made as shown in WO 96/19324.
  • the drill tool 3, which on the front surface is provided with hard metal buttons 16, is connected to housing 1 by means of a splined coupling 17 and prevented from falling out of the housing 1 by a ring 18 which for mounting reasons is divided.
  • An elastic sleeve 19 is arranged about the hammer piston 2 in order to prevent drill cuttings from entering into the impact device at upward drilling.
  • valve housing 21,22,23 comprising a valve body 9 is arranged in the rear part of the tube 1 .
  • Behind the valve housing there is a usual, not shown, threaded rear piece for connection to a drill tube string.
  • the drill tube string transfers rotation from a rotary motor to the tube 1 and thus via the splined coupling 17 to the drill tool 3.
  • driving liquid is supplied via the drill tube string to the impact device for driving this and for flushing the drill hole. In the drawings this is marked by the pressure source 5.
  • the valve body 9 cooperates alternately with valve seats 24 and 25.
  • pressure liquid is supplied to a first surface 4 on the hammer piston 2 from pressure source 5 and via a conduit 26, here drawn outside the machine, to a second surface 7 on the hammer piston 2.
  • first surface 4 is via a connection 29 connected to a reduced pressure in the flushing channel 6.
  • the flushing channel 6 is connected to the flushing channels 31,32 in the drill tool 3.
  • Surfaces 4 and 7 are situated on a part 28 of the hammer piston 2 having a larger diameter than the rest of the hammer piston. The pressure on the second surface 7 during drilling continuously loads the hammer piston 2 in a direction away from the drill tool 3.
  • the hammer piston 2 is around its periphery provided with a number of channels 8 and a number of slots 27. With the position of the hammer piston 2 shown in fig 1 the room 33 at the valve body 9 is connected via conduit 34, channels 8 and connection 35 to flushing channel 6. Through this the pressure in room 33 is lowered. Valve body 9 is displaced to cooperation with valve seat 25 by the pressure in the continuously pressurized room 36. The supply of pressure liquid to the first surface 4 is disconnected. The first surface 4 is instead connected to the reduced pressure in the flushing channel 6. The pressure on the second surface 7 then drives the hammer piston 2 to the right in fig 1. When the hammer piston 2 has reached its right end position slots 27 connect conduit 26 with conduit 34. Through this room 33 is pressurized so that the valve body 9 is displaced to the position shown in fig 1. The first surface 4 is again supplied with pressure liquid through which the hammer piston 2 makes a working stroke to the impact position shown in fig 1.
  • the impact device is shown in the position which the hammer piston takes when the feed force has ceased, e.g. through backing of the down-the-hole drilling machine from the drill hole front. Since the drill tool 3 can be pushed out somewhat from the drilling machine by the pressure in chamber 41, which is higher than the pressure in the drill hole, the hammer piston 2 passes the impact position, which is shown in fig 1. At upward drilling the movement past the impact position is assisted by the action of the hammer piston 2. When the hammer piston 2 reaches the position shown in fig 3 pressure liquid is supplied from conduit 26 via the channels 8 to conduit 34. Through this room 33 is pressurized so that the valve body is locked in the position shown in fig 3.
  • Pressure liquid is herewith supplied to the first surface 4 which through this pushes the hammer piston 2 to the left in fig 3 and locks it in this position. Because both the first surface 4 and the room 33 are pressurized the hammer piston remains in the shown position until the down-the-hole drilling machine again is fed toward the hole bottom so that drilling is resumed. In the position shown in fig 3 pressure liquid is supplied besides to the valve body 9 also via connection 35 to flushing channel 6 and from there to flushing channels 31 and 32 in the drill tool 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Dispositif de percussion entraîné par du liquide comprenant un carter (1) et un piston percuteur (2) pouvant se déplacer avec un mouvement de va-et-vient dans ce dernier. Le piston-percuteur est pourvu de canaux (8) qui servent, lorsque le piston percuteur passe en position de percussion (2), à envoyer du liquide sous pression à un corps (9) de soupape pour verrouiller ce dernier afin d'apporter en continu du liquide sous pression sur une première surface (4) située sur le piston percuteur (2) et à un canal (6) de lavage pour laver en continu un trou de forage.
PCT/SE1998/000447 1997-03-18 1998-03-12 Dispositif de percussion entraine par du liquide WO1998041726A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU64295/98A AU728663B2 (en) 1997-03-18 1998-03-12 Liquid driven impact device
CA002283447A CA2283447C (fr) 1997-03-18 1998-03-12 Dispositif de percussion entraine par du liquide
SE9902994A SE516309C2 (sv) 1997-03-18 1999-08-25 Vätskedrivet slagverk

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9700974-0 1997-03-18
SE9700974A SE9700974D0 (sv) 1997-03-18 1997-03-18 Fluidumdrivet slagverk

Publications (1)

Publication Number Publication Date
WO1998041726A1 true WO1998041726A1 (fr) 1998-09-24

Family

ID=20406198

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000447 WO1998041726A1 (fr) 1997-03-18 1998-03-12 Dispositif de percussion entraine par du liquide

Country Status (4)

Country Link
AU (1) AU728663B2 (fr)
CA (1) CA2283447C (fr)
SE (1) SE9700974D0 (fr)
WO (1) WO1998041726A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487485B (en) * 2011-01-21 2017-06-14 Nov Downhole Eurasia Ltd Downhole tool incorporating a reciprocating mass

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599730A (en) * 1970-01-07 1971-08-17 Atlas Copco Ab Pressure fluid operated percussion tool
US4446929A (en) * 1979-06-11 1984-05-08 Dresser Industries, Inc. Fluid operated rock drill hammer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599730A (en) * 1970-01-07 1971-08-17 Atlas Copco Ab Pressure fluid operated percussion tool
US4446929A (en) * 1979-06-11 1984-05-08 Dresser Industries, Inc. Fluid operated rock drill hammer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487485B (en) * 2011-01-21 2017-06-14 Nov Downhole Eurasia Ltd Downhole tool incorporating a reciprocating mass

Also Published As

Publication number Publication date
AU6429598A (en) 1998-10-12
SE9700974D0 (sv) 1997-03-18
CA2283447C (fr) 2006-10-31
CA2283447A1 (fr) 1998-09-24
AU728663B2 (en) 2001-01-18

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