WO1996004455A1 - Manchon interne destine a un marteau a piston actionne par fluide - Google Patents

Manchon interne destine a un marteau a piston actionne par fluide Download PDF

Info

Publication number
WO1996004455A1
WO1996004455A1 PCT/AU1995/000467 AU9500467W WO9604455A1 WO 1996004455 A1 WO1996004455 A1 WO 1996004455A1 AU 9500467 W AU9500467 W AU 9500467W WO 9604455 A1 WO9604455 A1 WO 9604455A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner sleeve
wall
delivery port
feed ports
sleeve
Prior art date
Application number
PCT/AU1995/000467
Other languages
English (en)
Inventor
Frederick Graham Moir
John Dewar
Original Assignee
Sds Pacific Pte. Ltd.
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 Sds Pacific Pte. Ltd. filed Critical Sds Pacific Pte. Ltd.
Priority to AU30729/95A priority Critical patent/AU3072995A/en
Publication of WO1996004455A1 publication Critical patent/WO1996004455A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

  • This invention relates to an inner sleeve for a fluid operated piston type hammer, and in particular to the redesign of fluid flow passages associated with the inner sleeve.
  • Fig. 1 shows a cross-sectional view of a conventional downhole hammer used in the mining industry. There are many varieties of this type of hammer and most make use of a reciprocating piston impacting against a drill bit.
  • a piston reciprocates within an inner sleeve, and is normally driven with compressed air.
  • the outer wall of the downhole hammer is counterbored to a required depth to form an air passage between the inner sleeve and housing.
  • This is the design of air passages which is conventionally used.
  • the outer wall may be assembled from two pieces with air passages drilled longitudinally in the wall. The halves are joined to connect the air passages in the two halves, and entry and exit ports are cut on the inside surface to the ends of each air passage.
  • the outside surface of a downhole hammer can be subject to high rates of wear.
  • the operating environments are extremely harsh, and the action of the hammer result in high forces being applied to the outer wall of the hammer.
  • the counterbore within the outer wall will result in more rapid failure due to the constant wear and thinning of the outer wall in the region of the air passages.
  • the thickness of the outer wall may be increased, however this will result in either the reduction of diameter of the piston or excessive thinning of the inner sleeve to maintain a fixed outer diameter of the hammer. Neither of these options are acceptable, particularly in the case of a reduced piston diameter.
  • a reduction in the piston diameter will mean a reduction in piston weight, which will have a serious effect on the performance level of the hammer.
  • Maintaining the weight and diameter of the piston becomes very critical in smaller diameter hammers. Therefore, it is important to maximise the diameter of the piston while at the same time maximising the effective wear thickness of the outer wall.
  • the invention comprises an inner sleeve for a fluid operated piston type hammer that comprises: a cylindrical sleeve wall, at least one delivery port, each delivery port comprising an aperture in one end of said sleeve wall, at least one set of two spaced feed ports, each said set of two feed ports operatively associated with, and spaced from, one delivery port, and each comprising an aperture in said sleeve wall, and at least one channel, where each channel comprises a recess in the outside surface of said sleeve wall extending from each said delivery port to each said set of associated two feed ports.
  • Each channel may contain one or more delivery ports and feed ports.
  • the invention may also comprise flat surfaces being formed on the external surface of the sleeve.
  • Fig. 2 shows a perspective view of an inner sleeve.
  • Fig. 1 shows a cross-sectional assembly view of a known downhole hammer.
  • a reverse circulation downhole hammer is shown.
  • the hammer comprises an outer wall 10, a drill bit 11, a piston 12, a sample delivery tube 13 and an inner sleeve 14.
  • the distributor 16 locates within the upper end of the inner sleeve 14.
  • a circumferential delivery channel 18 locates adjacent a number of delivery ports 20 that are radially spaced around the upper end of the inner sleeve 14.
  • the outer wall 10 is counterbored to produce an air passage 21 that extends from the delivery ports 20 to two sets of feed ports 22 and 23.
  • the feed ports 22 and 23 provide compressed air at required locations to produce the reciprocating movement of the piston 12.
  • the compressed air flows past the check valve 17 and through the distributor 16 and delivery ports 20 and into the air passage 21. Air is then delivered as required to the feed ports 22 and 23.
  • the downhole hammer shown in Fig. 1 has the disadvantage that the effective thickness of the outer wall 10 is reduced due to the counterboring.
  • the air delivery grooves or channels are formed in the outer surface of the inner sleeve 14 as shown in Fig. 2.
  • the six grooves 25 are formed in the outer surface of the inner sleeve 14, and extend from the first delivery ports 20 to the second set of feed ports 23.
  • the use of the grooves 25 mean that there is no need to counterbore the inner surface of the outer wall 10. Therefore, the wall thickness is increased, or a tube of thinner overall thickness can be used which allows an increase in the diameter and weight of the piston.

Abstract

Les marteaux de forage conventionnels imposent l'utilisation du contre-alésage de la paroi externe pour former le passage d'air requis entre le manchon interne et le carter. Mais la surface externe du marteau de forage peut être soumise à des niveaux d'usure élevés et le contre-alésage de la paroi externe entraîne généralement une défaillance plus rapide. On décrit donc un machon interne (14), utilisable dans un marteau à piston actionné par fluide (10), qui comprend une paroi de manchon cylindrique (14) dotée d'au moins un port d'amenée (20), qui comprend une ouverture située à une extrémité, et au moins un jeu de deux ports d'alimentation espacés (22, 23) associées en fonctionnement avec le port d'amenée (20) dont ils sont séparés. Un passage (25) comportant un évidement ménagé dans la surface externe du manchon (14) relie chaque port d'amenée (20) à chaque jeu de deux ports d'alimentation associés (22, 23). La paroi externe du marteau de forage (10) garde une épaisseur maximum car les passages d'air sont ménagés sur la surface externe de la paroi du manchon (14).
PCT/AU1995/000467 1994-08-01 1995-08-01 Manchon interne destine a un marteau a piston actionne par fluide WO1996004455A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU30729/95A AU3072995A (en) 1994-08-01 1995-08-01 Inner sleeve for a fluid operated piston type hammer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM7202A AUPM720294A0 (en) 1994-08-01 1994-08-01 Inner sleeve for a fluid operated piston type hammer
AUPM7202 1994-08-01

Publications (1)

Publication Number Publication Date
WO1996004455A1 true WO1996004455A1 (fr) 1996-02-15

Family

ID=3781724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1995/000467 WO1996004455A1 (fr) 1994-08-01 1995-08-01 Manchon interne destine a un marteau a piston actionne par fluide

Country Status (3)

Country Link
AU (1) AUPM720294A0 (fr)
WO (1) WO1996004455A1 (fr)
ZA (1) ZA956335B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071150A1 (fr) * 2000-03-22 2001-09-27 Minroc Technical Promotions Limited Mouton pneumatique de fond de puits a chambre de pression variable

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837317A (en) * 1957-02-15 1958-06-03 Ingersoll Rand Co Hole cleaning device
GB1188619A (en) * 1967-09-26 1970-04-22 Gunter Klemm Improvements in or relating to core drilling
US3640350A (en) * 1969-05-23 1972-02-08 S P R L Stenuick Freres Pneumatic drill for boring
GB1275900A (en) * 1970-01-07 1972-05-24 Atlas Copco Ab A pressure fluid operated percussion tool
US4133393A (en) * 1976-07-28 1979-01-09 Compair Construction And Mining Limited Down-the-hole percussion drills
US4637476A (en) * 1985-04-09 1987-01-20 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Percussive action machine for making holes in the ground
AU7339187A (en) * 1987-05-27 1988-12-01 Ingersoll-Rand Company Down hole drill improvement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837317A (en) * 1957-02-15 1958-06-03 Ingersoll Rand Co Hole cleaning device
GB1188619A (en) * 1967-09-26 1970-04-22 Gunter Klemm Improvements in or relating to core drilling
US3640350A (en) * 1969-05-23 1972-02-08 S P R L Stenuick Freres Pneumatic drill for boring
GB1275900A (en) * 1970-01-07 1972-05-24 Atlas Copco Ab A pressure fluid operated percussion tool
US4133393A (en) * 1976-07-28 1979-01-09 Compair Construction And Mining Limited Down-the-hole percussion drills
US4637476A (en) * 1985-04-09 1987-01-20 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Percussive action machine for making holes in the ground
AU7339187A (en) * 1987-05-27 1988-12-01 Ingersoll-Rand Company Down hole drill improvement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071150A1 (fr) * 2000-03-22 2001-09-27 Minroc Technical Promotions Limited Mouton pneumatique de fond de puits a chambre de pression variable

Also Published As

Publication number Publication date
ZA956335B (en) 1996-03-25
AUPM720294A0 (en) 1994-08-25

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