US20010003318A1 - Drill bit - Google Patents

Drill bit Download PDF

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Publication number
US20010003318A1
US20010003318A1 US09/731,200 US73120000A US2001003318A1 US 20010003318 A1 US20010003318 A1 US 20010003318A1 US 73120000 A US73120000 A US 73120000A US 2001003318 A1 US2001003318 A1 US 2001003318A1
Authority
US
United States
Prior art keywords
drill bit
protrusions
section
front section
diameter
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.)
Abandoned
Application number
US09/731,200
Inventor
Teijo Hulkkonen
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.)
Robit PLC
Original Assignee
Robit Rocktools Ltd 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 Robit Rocktools Ltd Oy filed Critical Robit Rocktools Ltd Oy
Assigned to OY ROBIT ROCKTOOLS LTD. reassignment OY ROBIT ROCKTOOLS LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HULKKONEN, TEIJO JUHANA
Publication of US20010003318A1 publication Critical patent/US20010003318A1/en
Abandoned 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1092—Gauge section of drill 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
    • E21B10/003—Drill bits with cutting edges facing in opposite axial directions
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts

Definitions

  • the invention relates to a drill bit, the frame of which comprises a front section with protrusions.
  • a typical drill bit comprises a cylindrical frame with a front section, and the diameter of the front section is larger than the diameter of other parts of the frame.
  • Such a drill bit is not guided properly; when the drill bit hits a hard rock slantwise, for example, it easily moves in the lateral direction and is stuck to the edges of a drilled hole.
  • it is quite difficult to reverse the drill bit, i.e. pull the drill out of the hole. It is particularly difficult to reverse when drilling banks, for instance, whereby the material to be drilled is clay or a similar softish material and/or fragmental rock.
  • a drill bit for bank drilling is disclosed, the diameter of the drill bit being substantially the same both in the front section of the drill bit and in other parts of the drill bit.
  • rear teeth i.e. a rear reamer
  • the purpose of the rear reamer is to broaden a drilled hole when the drill is reversed.
  • the material that is removed by the rear reamer from the edge of the hole blocks up the area between the rear section and the front section of the drill bit fairly easily, and thus it is not always sufficiently easy to reverse.
  • the drill bit of the invention is characterized in that rear teeth are arranged in connection with the front section.
  • the essential idea of the invention is that a set of first rear teeth is arranged at the drill bit in connection with the front section of the drill bit.
  • the idea of a preferred embodiment of the invention is that there are protrusions in connection with the front section such that the diameter of the front section measured at the protrusions is larger than the diameter of the middle section of the drill bit frame, and there are also protrusions in the rear section of the drill bit such that the diameter of the drill bit rear section measured at these protrusions is larger than the diameter of the middle section of the drill bit frame.
  • the idea of another preferred embodiment is that the diameter of the drill bit rear section measured at its protrusions is smaller than the diameter of the drill bit front section measured at its protrusions.
  • the idea of a third preferred embodiment is that a set of second rear teeth is arranged at the protrusions of the rear section of the drill bit.
  • the invention provides the advantage that the drill and the drill bit can be reversed quite smoothly and the gap between the drill bit and the hole does not block up easily.
  • the drill bit is guided efficiently.
  • guiding improves and also the gap between the rear section of the drill bit and the hole can be kept substantially unblocked during drilling and reversing.
  • the set of second rear teeth of the rear section When a set of second rear teeth is arranged at the protrusions of the rear section, the set of second rear teeth of the rear section performs a pilot reaming during the reversing and the set of first rear teeth in the front section of the drill bit performs the actual reaming for the hole, which means that the reaming is performed in two stages and the reversing is implemented very smoothly and easily.
  • FIG. 1 schematically shows a side view of a drill bit according to the invention, partly in cross-section, and
  • FIG. 2 shows a front view of the drill bit according to FIG. 1.
  • FIG. 1 shows a drill bit 1 .
  • the drill bit 1 When the drill bit 1 is used, it is attached to one end of a drill rod by means of threads 2 , for instance, or in some other manner known per se.
  • the drill bit 1 comprises a front section 3 , a middle section 4 and a rear section 5 .
  • Hard metal buttons 6 are arranged at the face of the drill bit frame in a manner known per se. Most preferably each hard metal button 6 is set above its own bulge in a manner shown in FIG. 2, whereupon flushing fluid can flow very efficiently and easily between the hard metal buttons 6 and the bulges.
  • Protrusions 7 have been formed at the front section 3 such that the diameter of the front section 3 measured at the protrusions is larger than the diameter of the middle section 4 .
  • the drill bit 1 further comprises openings 8 which enable the flow of the flushing fluid.
  • a set of first rear teeth 9 is formed at the rear edge of the protrusions 7 in the front section 3 .
  • the first rear teeth 9 are slanting, as shown in FIG. 1, and when the drill bit 1 rotates in the direction shown by the arrow A, they broaden the drilled hole during the reversing of the drill bit 1 and thus facilitate the reversing. Since the set of first rear teeth 9 is in connection with the front section 3 of the drill bit 1 , material that is removed by the set of first rear teeth 9 during the reversing easily flows past the front section 3 without blocking up the gap between the drill bit 1 and the wall of the drilled hole.
  • the distance between the set of first rear teeth 9 and the face of the drill bit 1 is rather short.
  • the distance between the set of first rear teeth 9 and the face of the drill bit 1 is preferably shorter than the diameter of the front section 3 of the drill bit 1 . It is particularly preferable that the distance between the set of first rear teeth 9 and the face of the drill bit 1 is so short that it is smaller than 0.5 times the diameter of the front section 3 of the drill bit 1 .
  • a second set of protrusions 10 is arranged at the rear section 5 of the drill bit 1 .
  • the second set of protrusions 10 at the rear section 5 improves the guiding of the drill bit 1 .
  • the second protrusions 10 of the rear section 5 are lower than the protrusions 7 of the front section 3 .
  • the diameter of the rear section 5 measured at the second set of protrusions 10 is larger than the diameter of the middle section 4 of the drill bit 1 , but smaller than the diameter of the drill bit 1 front section 3 measured at the protrusions 7 .
  • the gap between the rear section 5 of the drill bit 1 and the wall of the drilled hole does not block up very easily.
  • a set of second rear teeth 11 is arranged at the rear end of the protrusions 10 .
  • the set of second rear teeth 11 performs a pilot reaming and the set of first rear teeth 9 in connection with the front section 3 functions as the actual reamer.
  • the reaming is performed in two stages, whereby the drill bit 1 is reversed smoothly and the risk of blocking is eliminated.
  • the drawing and the related description are only intended to illustrate the idea of the invention. In its details the invention may vary within the scope of the claims. Consequently, the proportions between the front section 3 , the middle section 4 and the rear section 5 may vary within fairly broad limits. Furthermore, the second set of protrusions 10 may at least partly extend to the middle section 4 , for example. The second protrusions 10 at the rear section 5 may also be slanting or spiral.

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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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

A drill bit, the frame of which comprises a front section with protrusions. A set of first rear teeth is arranged at the front section, preferably at the rear part of the protrusions. The set of first rear teeth broadens a drilled hole when the drill is reversed.

Description

  • The invention relates to a drill bit, the frame of which comprises a front section with protrusions. [0001]
  • A typical drill bit comprises a cylindrical frame with a front section, and the diameter of the front section is larger than the diameter of other parts of the frame. Such a drill bit is not guided properly; when the drill bit hits a hard rock slantwise, for example, it easily moves in the lateral direction and is stuck to the edges of a drilled hole. Furthermore, when such a drill bit is used, it is quite difficult to reverse the drill bit, i.e. pull the drill out of the hole. It is particularly difficult to reverse when drilling banks, for instance, whereby the material to be drilled is clay or a similar softish material and/or fragmental rock. [0002]
  • A drill bit for bank drilling is disclosed, the diameter of the drill bit being substantially the same both in the front section of the drill bit and in other parts of the drill bit. Further, rear teeth, i.e. a rear reamer, are arranged at the rear edge of the drill bit. The purpose of the rear reamer is to broaden a drilled hole when the drill is reversed. The material that is removed by the rear reamer from the edge of the hole, however, blocks up the area between the rear section and the front section of the drill bit fairly easily, and thus it is not always sufficiently easy to reverse. [0003]
  • It is an object of the present invention to provide a drill bit with very good properties. [0004]
  • The drill bit of the invention is characterized in that rear teeth are arranged in connection with the front section. [0005]
  • The essential idea of the invention is that a set of first rear teeth is arranged at the drill bit in connection with the front section of the drill bit. The idea of a preferred embodiment of the invention is that there are protrusions in connection with the front section such that the diameter of the front section measured at the protrusions is larger than the diameter of the middle section of the drill bit frame, and there are also protrusions in the rear section of the drill bit such that the diameter of the drill bit rear section measured at these protrusions is larger than the diameter of the middle section of the drill bit frame. The idea of another preferred embodiment is that the diameter of the drill bit rear section measured at its protrusions is smaller than the diameter of the drill bit front section measured at its protrusions. The idea of a third preferred embodiment is that a set of second rear teeth is arranged at the protrusions of the rear section of the drill bit. [0006]
  • The invention provides the advantage that the drill and the drill bit can be reversed quite smoothly and the gap between the drill bit and the hole does not block up easily. By arranging protrusions at the rear section of the drill bit, the drill bit is guided efficiently. By making the protrusions of the rear section smaller than the protrusions of the front section, guiding improves and also the gap between the rear section of the drill bit and the hole can be kept substantially unblocked during drilling and reversing. When a set of second rear teeth is arranged at the protrusions of the rear section, the set of second rear teeth of the rear section performs a pilot reaming during the reversing and the set of first rear teeth in the front section of the drill bit performs the actual reaming for the hole, which means that the reaming is performed in two stages and the reversing is implemented very smoothly and easily. [0007]
  • The invention is described in greater detail in the attached drawing in which [0008]
  • FIG. 1 schematically shows a side view of a drill bit according to the invention, partly in cross-section, and [0009]
  • FIG. 2 shows a front view of the drill bit according to FIG. 1. [0010]
  • FIG. 1 shows a drill bit [0011] 1. When the drill bit 1 is used, it is attached to one end of a drill rod by means of threads 2, for instance, or in some other manner known per se. The drill bit 1 comprises a front section 3, a middle section 4 and a rear section 5. Hard metal buttons 6 are arranged at the face of the drill bit frame in a manner known per se. Most preferably each hard metal button 6 is set above its own bulge in a manner shown in FIG. 2, whereupon flushing fluid can flow very efficiently and easily between the hard metal buttons 6 and the bulges. Protrusions 7 have been formed at the front section 3 such that the diameter of the front section 3 measured at the protrusions is larger than the diameter of the middle section 4. The drill bit 1 further comprises openings 8 which enable the flow of the flushing fluid.
  • A set of first [0012] rear teeth 9 is formed at the rear edge of the protrusions 7 in the front section 3. The first rear teeth 9 are slanting, as shown in FIG. 1, and when the drill bit 1 rotates in the direction shown by the arrow A, they broaden the drilled hole during the reversing of the drill bit 1 and thus facilitate the reversing. Since the set of first rear teeth 9 is in connection with the front section 3 of the drill bit 1, material that is removed by the set of first rear teeth 9 during the reversing easily flows past the front section 3 without blocking up the gap between the drill bit 1 and the wall of the drilled hole. Since the set of first rear teeth 9 is thus in connection with the front section 3, the distance between the set of first rear teeth 9 and the face of the drill bit 1 is rather short. The distance between the set of first rear teeth 9 and the face of the drill bit 1 is preferably shorter than the diameter of the front section 3 of the drill bit 1. It is particularly preferable that the distance between the set of first rear teeth 9 and the face of the drill bit 1 is so short that it is smaller than 0.5 times the diameter of the front section 3 of the drill bit 1.
  • A second set of [0013] protrusions 10 is arranged at the rear section 5 of the drill bit 1. The second set of protrusions 10 at the rear section 5 improves the guiding of the drill bit 1. However, the second protrusions 10 of the rear section 5 are lower than the protrusions 7 of the front section 3. Thus, the diameter of the rear section 5 measured at the second set of protrusions 10 is larger than the diameter of the middle section 4 of the drill bit 1, but smaller than the diameter of the drill bit 1 front section 3 measured at the protrusions 7. In this case, the gap between the rear section 5 of the drill bit 1 and the wall of the drilled hole does not block up very easily. A set of second rear teeth 11 is arranged at the rear end of the protrusions 10. When the drill bit 1 is reversed, the set of second rear teeth 11 performs a pilot reaming and the set of first rear teeth 9 in connection with the front section 3 functions as the actual reamer. The reaming is performed in two stages, whereby the drill bit 1 is reversed smoothly and the risk of blocking is eliminated.
  • The drawing and the related description are only intended to illustrate the idea of the invention. In its details the invention may vary within the scope of the claims. Consequently, the proportions between the front section [0014] 3, the middle section 4 and the rear section 5 may vary within fairly broad limits. Furthermore, the second set of protrusions 10 may at least partly extend to the middle section 4, for example. The second protrusions 10 at the rear section 5 may also be slanting or spiral.

Claims (6)

1. A drill bit, the frame of which comprises a front section with protrusions, the front section being provided with a set of first rear teeth, and a rear section which is provided with second protrusions which are arranged to improve guiding of the drill bit, the rear end of the second protrusions being provided with a set of second rear teeth.
2. A drill bit as claimed in
claim 1
, wherein the distance between the set of first rear teeth and the face of the drill bit is shorter than the diameter of the front section of the drill bit.
3. A drill bit as claimed in
claim 2
, wherein the distance between the set of first rear teeth and the face of the drill bit is smaller than 0.5 times the diameter of the front section of the drill bit.
4. A drill bit as claimed in
claim 1
, wherein the set of first rear teeth is arranged at the rear part of the protrusions.
5. A drill bit as claimed in
claim 1
, wherein the diameter of the drill bit front section measured at the protrusions is larger than the diameter of the other parts of the frame of the drill bit.
6. A drill bit as claimed in
claim 1
, wherein the drill bit comprises a middle section and a rear section and the rear section comprises a second set of protrusions such that the diameter of the rear section measured at the second set of protrusions is larger than the diameter of the middle section of the drill bit, but smaller than the diameter of the drill bit front section measured at the protrusions.
US09/731,200 1999-12-09 2000-12-06 Drill bit Abandoned US20010003318A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI992647A FI19992647A (en) 1999-12-09 1999-12-09 drill
FI19992647 1999-12-09

Publications (1)

Publication Number Publication Date
US20010003318A1 true US20010003318A1 (en) 2001-06-14

Family

ID=8555726

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/731,200 Abandoned US20010003318A1 (en) 1999-12-09 2000-12-06 Drill bit

Country Status (5)

Country Link
US (1) US20010003318A1 (en)
JP (1) JP2001287220A (en)
AU (1) AU7216000A (en)
DE (1) DE10060901A1 (en)
FI (1) FI19992647A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003332A1 (en) * 2002-06-26 2004-01-08 Sandvik Ab Rock drill bit and method for the manufacture thereof
US20090028280A1 (en) * 2006-03-01 2009-01-29 Matsushita Electric Industrial Co., Ltd Transmitter and transmitter/receiver
US20090184564A1 (en) * 2008-01-22 2009-07-23 The William J. Brady Loving Trust Pcd percussion drill bit
US20180002985A1 (en) * 2016-06-30 2018-01-04 Schlumberger Technology Corporation Bi-directional drilling systems and methods
CN111219150A (en) * 2018-11-26 2020-06-02 河南理工大学 Drilling, cutting and punching integrated drill bit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003332A1 (en) * 2002-06-26 2004-01-08 Sandvik Ab Rock drill bit and method for the manufacture thereof
US20040065482A1 (en) * 2002-06-26 2004-04-08 Sandvik Ab Rock drill bit and method for the manufacture thereof
US20090028280A1 (en) * 2006-03-01 2009-01-29 Matsushita Electric Industrial Co., Ltd Transmitter and transmitter/receiver
US20090184564A1 (en) * 2008-01-22 2009-07-23 The William J. Brady Loving Trust Pcd percussion drill bit
US20180002985A1 (en) * 2016-06-30 2018-01-04 Schlumberger Technology Corporation Bi-directional drilling systems and methods
US10689910B2 (en) * 2016-06-30 2020-06-23 Schlumberger Technology Corporation Bi-directional drilling systems and methods
CN111219150A (en) * 2018-11-26 2020-06-02 河南理工大学 Drilling, cutting and punching integrated drill bit

Also Published As

Publication number Publication date
FI19992647A (en) 2001-06-10
JP2001287220A (en) 2001-10-16
AU7216000A (en) 2001-06-14
DE10060901A1 (en) 2001-06-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: OY ROBIT ROCKTOOLS LTD., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HULKKONEN, TEIJO JUHANA;REEL/FRAME:011364/0970

Effective date: 20001130

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION