US3722610A - Drilling equipment especially for drilling in earth or loose rock - Google Patents

Drilling equipment especially for drilling in earth or loose rock Download PDF

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Publication number
US3722610A
US3722610A US00011955A US3722610DA US3722610A US 3722610 A US3722610 A US 3722610A US 00011955 A US00011955 A US 00011955A US 3722610D A US3722610D A US 3722610DA US 3722610 A US3722610 A US 3722610A
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US
United States
Prior art keywords
drill bit
drilling
casing pipe
coupling means
casing
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.)
Expired - Lifetime
Application number
US00011955A
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English (en)
Inventor
K Hornsten
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.)
Nya Asfalt AB
Original Assignee
Nya Asfalt 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 Nya Asfalt AB filed Critical Nya Asfalt AB
Application granted granted Critical
Publication of US3722610A publication Critical patent/US3722610A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion

Definitions

  • ABSTRACT A compound drill bit consisting of an outer ringshaped drill bit and an inner central drill bit which is detachably connected to the outer drill bit in a manner to permit simultaneous operation when impact and rotational forces are applied.
  • the impact and rotational forces are transmitted to them both through a casing which is attached to the outer ring-shaped rill bit.
  • the two drill bits are so interconnected as to make it possible to expel the inner drill bit from the outer drill bit while both drill bits and the casing are positioned in the bore hole produced by them.
  • Means are provided for passage of flushing fluid between the inner and outer drill bits.
  • the present invention relates to a drilling equipment, especially for drilling in earth or loose rock, comprising an inner central drill bit, an outer ring-shaped drill bit, and a casing pipe connected to the outer drill bit, said equipment being arranged to permit simultaneous driving of the two drill bits by means of a common boring machine.
  • the invention has for its object to provide a drilling as a boring rod passing equipment of the kind described, in which the central cannot be reached without a preceding removal of the.
  • the purpose of the invention is to provide an improved drilling equipment which utilizes the advantages of the previously known equipments above described but eliminates their drawbacks.
  • the invention relates to a drilling equipment, especially for drilling in earth or loose rock, comprising an inner central drill bit, an outer ringshaped drill bit, and a casing pipe connected to the outer drill bit, the two drill bits being detachably interconnected soas to permit the required impact and rotation forces for their simultaneous operation to be transmitted to them both through the casing pipe.
  • the drilling equipment according to the invention is primarily characterized in that the inner drill bit is designed and arranged so as to make it possible to expel the inner drill bit from the outer drill bit when the drill bits and the casing pipe are positioned in a bore hole produced thereby.
  • the invention makes it possible to use increased impact forces and a reduced impact frequency as the buckling tendency of the casing pipe is lower than that of the central drilling rod of the known equipments.
  • the equipment according to the invention is especially suited for drilling in earth or loose rock, for instance for drilling holes for anchor rods of for grout injection.
  • the equipment can also be designed so as to permit drilling in solid rock.
  • the inner drill bit is provided with a tapered neck adapted to be received in a correspondingly shaped central passage in the outer drill bit, the inner drill bit being arranged to be detachably retained in the outer drill bit through frictional engagement therewith.
  • the equipment according to the invention can be provided with coupling means for connecting the inner drill bit to a drilling rod which is inserted through the casing pipe when the preceding drilling step has been completed.
  • a drilling rod is, however, required only in this special case, where it is needed only during the later boring step i.e. not during the step when both drill bits are simultaneously driven through the earth. This means that also when it is not possible to eliminate the drilling rod entirely, the time for using said rod and the wear thereof will be substantially reduced.
  • the coupling means of the inner drill bit may have the form of a projecting threaded bolt or consist of a threaded bore in said drill bit.
  • said coupling means may be arranged to form a bayonet coupling with co-operating means at the lower end of the drilling rod.
  • FIG. 1 shows a longitudinal section through the lower portion of a drill equipment according to one embodiment of the invention
  • FIGS. 2 and 3 are lateral views illustrating two alternative designs of the inner drill bit.
  • FIG. 4 is a top plan view of the inner drill bit show in FIG. 3.
  • Reference numeral 1 designates a casing pipe which may consist of one or more interconnected sections. At its upper end (not shown in the drawing) the casing pipe 1 is arranged to be connected to a boring machine, while at its lower end it is provided with an externally threaded end portion 2 of reduced diameter on which an internally threaded socket 3 is mounted, said socket forming the upper portion of a ring-shaped outer 'drill bit 4 having a set of hard metal cutting edges 5.
  • Reference numeral 6 designates an inner central drill bit having at its lower end a set of hard metal cutting edges 7 and at its upper end a tapered neck 8 which has its smallest diameter at the end thereof remote from the cutting edges 7 and which is received in a correspondingly shaped central passage 9 in the outer drill bit 4. The inner drill bit 6 is arranged to be secured concentrically in the outer drill bit 4 through frictional engagement between the neck 8 and the inner wall of drill bit 4 defining the conical passage 9.
  • Reference numeral 10 designates flushing fluid passages provided in known manner in the inner drill bit 6, while reference numeral 11 refers to correspond- ,ing passages or channels having the shape of grooves provided in the inner wall of the outer drill bit 4.
  • reference numeral 11 refers to correspond- ,ing passages or channels having the shape of grooves provided in the inner wall of the outer drill bit 4.
  • the inner drill bit 6' shown in HS. 2 differs from the corresponding drill bit according to H6. 1 only in that it is provided with an upwardly projecting threaded bolt 12 adapted to facilitate an interconnection between drill bit 6' and a drilling rod inserted through casing pipe 1 in such cases where it is desired to continue the drilling operation with only the inner drill bit.
  • the inner drill bit 6" shown in FIGS. 3 and 4 is provided with a projecting bolt 13 serving to enable an interconnection with a drilling rod.
  • Bolt 13 is, however, provided with axially and circumferentially extending grooves 14 and 15, respectively, which form bayonet coupling means.
  • the invention is not restricted to the embodiment above described but includes a number of modifications and alternative embodiments.
  • the interconnection between the inner and the outerdrill bit can be obtained by designing them for. threaded-engagement with each other, or the drill bits may be provided with bayonet coupling means.
  • a drilling device that is especially useful for drilling in earth or loose rock, comprising in combination:
  • an outerdrill bit means-connected to the lower end of said casing pipe in such a manner that rotation of said casing pipe will cause rotation of said outer drill bit
  • a central opening in the lower portion of said outer drill bit said central opening having tapered side walls that form a frustro-conical section that diverges outwardly in a downward direction
  • said inner drill bit having a tapered neck section that is shaped so that it will only frictionally engage the inner surface of the central opening in said whereby 1. rotational and impact forces applied to said casing means will be transmitted to both said outer drill bit and said inner drill bit and i 2. said inner drill bit can beexpelled from engagement with said outer drill bit by the application of a rod inserted through the interior of the casing pipe.
  • a drilling device characterized in that said coupling means include a threaded bolt projecting upwardly from the inner'drill bit.
  • a drilling device according to claim 1 characterized in that said coupling means is in the form of a bayonet coupling means.

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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)
US00011955A 1969-02-28 1970-02-17 Drilling equipment especially for drilling in earth or loose rock Expired - Lifetime US3722610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE02841/69A SE329138B (fr) 1969-02-28 1969-02-28

Publications (1)

Publication Number Publication Date
US3722610A true US3722610A (en) 1973-03-27

Family

ID=20260825

Family Applications (1)

Application Number Title Priority Date Filing Date
US00011955A Expired - Lifetime US3722610A (en) 1969-02-28 1970-02-17 Drilling equipment especially for drilling in earth or loose rock

Country Status (6)

Country Link
US (1) US3722610A (fr)
AT (1) AT296920B (fr)
DE (1) DE2007691A1 (fr)
FR (1) FR2033069A5 (fr)
GB (1) GB1231556A (fr)
SE (1) SE329138B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080135292A1 (en) * 2006-12-07 2008-06-12 Schlumberger Technology Corporation Apparatus for eliiminating net drill bit torque and controlling drill bit walk
CN114382434A (zh) * 2021-12-22 2022-04-22 中国石油大学(华东) 一种用于深水的表层导管自钻进固井装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9401528U1 (de) * 1994-01-26 1994-05-19 Gartec Geo- Und Umwelttechnik Gmbh, 03253 Doberlug-Kirchhain Bohrmeißel zur Herstellung von Pilotbohrungen für Durchörterungen u.dgl.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080135292A1 (en) * 2006-12-07 2008-06-12 Schlumberger Technology Corporation Apparatus for eliiminating net drill bit torque and controlling drill bit walk
US7610970B2 (en) * 2006-12-07 2009-11-03 Schlumberger Technology Corporation Apparatus for eliminating net drill bit torque and controlling drill bit walk
CN114382434A (zh) * 2021-12-22 2022-04-22 中国石油大学(华东) 一种用于深水的表层导管自钻进固井装置及方法

Also Published As

Publication number Publication date
FR2033069A5 (fr) 1970-11-27
AT296920B (de) 1972-03-10
SE329138B (fr) 1970-10-05
DE2007691A1 (de) 1970-09-17
GB1231556A (fr) 1971-05-12

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