US3416616A - Deep drills with eccentric bits - Google Patents

Deep drills with eccentric bits Download PDF

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Publication number
US3416616A
US3416616A US619746A US61974667A US3416616A US 3416616 A US3416616 A US 3416616A US 619746 A US619746 A US 619746A US 61974667 A US61974667 A US 61974667A US 3416616 A US3416616 A US 3416616A
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United States
Prior art keywords
eccentric
drill
sleeve
deep
tube
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Expired - Lifetime
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US619746A
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Ahlgren Hans Hj
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Skanska AB
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Skanska Cementgjuteriet AB
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/265Bi-center drill bits, i.e. an integral bit and eccentric reamer used to simultaneously drill and underream the hole
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/36Percussion drill bits
    • E21B10/40Percussion drill bits with leading portion
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/64Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E21B10/66Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/20Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • ABSTRACT OF THE DISCLOSURE A bit having an eccentric cutting edge and an eccentric sleeve rotatable through 180 about an upper portion of the bit to move the cutting edge laterally to a drilling position under the lower edge of a lining tube or to move the eccentric cutting edge under the interior of the tube thus permitting upward withdrawal of the bit.
  • the present invention relates to an improvement in deep drills with an eccentric bit adapted to be followed, during drilling, by a tube serving as a lining for the drilled hole.
  • an eccentric sleeve is mounted for rotation on an upper portion of the bit, the most eccentric portion of the sleeve being adapted to lie, during drilling, diametrically opposite the most eccentric portion of the active end portion of the bit and which sleeve, for the purpose of enabling the bit to be drawn up through the tube, is adapted to be rotated relative to said upper portion through 180.
  • the said upper portion may possibly comprise a joining rod, screwed into the drill bit.
  • Prior :art drills of this type are encumbered with the disadvantage that, particularly in the case of certain ground characteristics, drilled particles of material enter the lining tube between its wall and the portion of the eccentric sleeve which is not provided with the eccentric portion, designed as a guiding lug; the said material thus making it diflicult to rotate the eccentric sleeve relative to the drilling rod, to enable the tube to be drawn up through the drill.
  • the object of the present invention is to remove the above disadvantage of prior art deep drills, which is achieved in that the deep drill according to the invention has obtained the characteristics disclosed in the claims.
  • FIG. 1 shows in perspective and partly in section the lower portion of a deep drill according to the invention with a drill bit drawn into the lining tube
  • FIG. 2 shows the same with the drill bit in drilling position and FIGS. 3 and 4 show in side view and partly in section the deep drill in the same position as FIGS. 1 and 2 respectively.
  • the deep drill in the shown embodiment is intended for impact drilling in which the drill is rotated, in this case counterclockwise, approximately one tenth of a revolution in each impact, and is provided with an eccentric end portion 1, active during drilling, of a drill bit 2 known per se.
  • the drilling rod comprises joning rods connected with joining sleeves up to a shank adapter secured in the drilling apparatus.
  • the lower joining sleeve 3 is screwed onto a pin member 4 made integral with the drill bit 2 ad provided with a left-hand thread.
  • the active end portion 1 of the eccentric bit is provided, in a manner known per se, with a cutting edge 5 of hard metal.
  • the drill is also provided with a pilot drill bit 6 with four cutting edges 7.
  • the pilot bit is not part of the invention proper since in this respect the drill can just as well be without the same.
  • a lining tube 8 follows the drill during drilling and moves downwards in time with the drill.
  • the eccentric portion of the drill bit projects outside the circumference of the lining tube so that a hole large enough for the lining tube is made.
  • To allow the drill to be drawn up out of the tube the said eccentric portion must consequently be displaced in towards the tube centre.
  • This is etfected with an eccentric sleeve 9, which is rotatably mounted around an upper portion 10 of the drill bit 2.
  • the sleeve 9 is provided with an inwardly projecting lug 11 engaged in a peripherally, 180 extending groove 12 in portion 10.
  • the groove 12 is connected with the end face 13 of the portion 10 by means of an axially extending groove 14, whereby the lug 11, when assembling the drill, can be arranged in the groove 12.
  • a locking sleeve 15 abutting the end face 13 fixes the eccentric sleeve 9 axially and builds an abutment surface for the joining sleeve 3.
  • the drill is also provided with rinsing holes (not shown) which connect the centre channel of the drill with suitable positions on the drill bit and remaining portions for flushing away earth, powdered stone and other drilling products.
  • the eccentric sleeve 9 has a cross section which completely fills the circular lining tube 8, but because the sleeve 9 is eccentrically mounted relative to the drill axis a, the latter can be moved relative to the lining tube axis b (see FIG. 3).
  • the portion 10 has a centre axis 0 lying centrally between the drill axis a and the tube axis b, when the most eccentric portion of the eccentric sleeve lies axially in line with themost eccentric portion of the active end portion 1 (FIG. 3) of the drill bit.
  • the portion which has been designated as an upper portion 10 of the drill bit, naturally need not be made integral with the drill bit in general but can, as with the corresponding portions in the drill according to the aforementioned patent be connected by means of threaded joints with the drill bit, and is then called a joining rod.
  • the described arrangement removes the disadvantages described in the preamble, in that the eccentric sleeve, which completely fills the total cross section of the tube, prevents coarse drilling products from collecting therein and making rotation of the sleeve diflicult. Furthermore, better guiding of the drill in the lining tube is obtained.
  • the invention is naturally not restricted to the described embodiment but, for instance can also be adapted to rotary drills.

Description

1968 H. HJ.AHLGREN DEEP DRILLS WITH ECCENTRIC BITS 4 Sheets-Sheet 1 Filed March 1, 1967 ec. 17, 1968 H. HJ. AHLGREN 3,416,615
DEEP DRILLS WITH ECCENTRIC BITS Filed March 1, 1967 4 Shets-Sheet 2 4 Sheets-Sheet 3 H. HJ. AHLGREN DEEP DRILLS WITH ECCENTRIC BITS Filed March 1. 1967 1968 H. HJ. AHLGREN 3,416,61
DEEP DRILLS WITH ECCENTRIC BITS Filed March 1, 1967 4 Sheets-Sheet 4 Fig.1. /44 4 15 I I L W ii/ United States Patent 3,416,616 DEEP DRILLS WITH ECCENTRIC BITS Hans Hj. Ahlgren, Solna, Sweden, assignor to AB Skanska Cementgjuteriet, Stockholm, Sweden, a corporation of Sweden Filed Mar. 1, 1967, Ser. No. 619,746 2 Claims. (Cl. 175-258) ABSTRACT OF THE DISCLOSURE A bit having an eccentric cutting edge and an eccentric sleeve rotatable through 180 about an upper portion of the bit to move the cutting edge laterally to a drilling position under the lower edge of a lining tube or to move the eccentric cutting edge under the interior of the tube thus permitting upward withdrawal of the bit.
The present invention relates to an improvement in deep drills with an eccentric bit adapted to be followed, during drilling, by a tube serving as a lining for the drilled hole. For this purpose an eccentric sleeve is mounted for rotation on an upper portion of the bit, the most eccentric portion of the sleeve being adapted to lie, during drilling, diametrically opposite the most eccentric portion of the active end portion of the bit and which sleeve, for the purpose of enabling the bit to be drawn up through the tube, is adapted to be rotated relative to said upper portion through 180. The said upper portion may possibly comprise a joining rod, screwed into the drill bit.
Prior :art drills of this type, more closely described in US. Patent 3,174,563, are encumbered with the disadvantage that, particularly in the case of certain ground characteristics, drilled particles of material enter the lining tube between its wall and the portion of the eccentric sleeve which is not provided with the eccentric portion, designed as a guiding lug; the said material thus making it diflicult to rotate the eccentric sleeve relative to the drilling rod, to enable the tube to be drawn up through the drill.
The object of the present invention is to remove the above disadvantage of prior art deep drills, which is achieved in that the deep drill according to the invention has obtained the characteristics disclosed in the claims.
The invention will be more closely described with reference to the accompanying drawings, where FIG. 1 shows in perspective and partly in section the lower portion of a deep drill according to the invention with a drill bit drawn into the lining tube,
FIG. 2 shows the same with the drill bit in drilling position and FIGS. 3 and 4 show in side view and partly in section the deep drill in the same position as FIGS. 1 and 2 respectively.
The deep drill in the shown embodiment is intended for impact drilling in which the drill is rotated, in this case counterclockwise, approximately one tenth of a revolution in each impact, and is provided with an eccentric end portion 1, active during drilling, of a drill bit 2 known per se. The drilling rod comprises joning rods connected with joining sleeves up to a shank adapter secured in the drilling aparatus. The lower joining sleeve 3 is screwed onto a pin member 4 made integral with the drill bit 2 ad provided with a left-hand thread.
The active end portion 1 of the eccentric bit is provided, in a manner known per se, with a cutting edge 5 of hard metal. In this instance the drill is also provided with a pilot drill bit 6 with four cutting edges 7. The pilot bit, however, is not part of the invention proper since in this respect the drill can just as well be without the same.
For the purpose of lining the drill hole a lining tube 8 follows the drill during drilling and moves downwards in time with the drill. The eccentric portion of the drill bit projects outside the circumference of the lining tube so that a hole large enough for the lining tube is made. To allow the drill to be drawn up out of the tube the said eccentric portion must consequently be displaced in towards the tube centre. This is etfected with an eccentric sleeve 9, which is rotatably mounted around an upper portion 10 of the drill bit 2. The sleeve 9 is provided with an inwardly projecting lug 11 engaged in a peripherally, 180 extending groove 12 in portion 10. The groove 12 is connected with the end face 13 of the portion 10 by means of an axially extending groove 14, whereby the lug 11, when assembling the drill, can be arranged in the groove 12. A locking sleeve 15 abutting the end face 13 fixes the eccentric sleeve 9 axially and builds an abutment surface for the joining sleeve 3. The drill is also provided with rinsing holes (not shown) which connect the centre channel of the drill with suitable positions on the drill bit and remaining portions for flushing away earth, powdered stone and other drilling products.
The eccentric sleeve 9 has a cross section which completely fills the circular lining tube 8, but because the sleeve 9 is eccentrically mounted relative to the drill axis a, the latter can be moved relative to the lining tube axis b (see FIG. 3). The portion 10 has a centre axis 0 lying centrally between the drill axis a and the tube axis b, when the most eccentric portion of the eccentric sleeve lies axially in line with themost eccentric portion of the active end portion 1 (FIG. 3) of the drill bit. Since on rotating the eccentric sleeve the tube axis b moves in a circular are :around the axis c the tube axis b will thus coincide with the drill axis a, when the most eccentric portion of the eccentric sleeve adopts a position diametrically opposed to the most eccentric portion of the active end portion (FIG. 4) of the drill bit. Rotation of the eccentric sleeve to drilling position occurs automatically.
on rotating the drill counterclockwise during drilling.
The portion, which has been designated as an upper portion 10 of the drill bit, naturally need not be made integral with the drill bit in general but can, as with the corresponding portions in the drill according to the aforementioned patent be connected by means of threaded joints with the drill bit, and is then called a joining rod.
The described arrangement removes the disadvantages described in the preamble, in that the eccentric sleeve, which completely fills the total cross section of the tube, prevents coarse drilling products from collecting therein and making rotation of the sleeve diflicult. Furthermore, better guiding of the drill in the lining tube is obtained.
The invention is naturally not restricted to the described embodiment but, for instance can also be adapted to rotary drills.
I claim:
1. A deep drill with an eccentric drill bit adapted to be followed during drilling by a tube (8) serving as a liner for the drilled hole, an eccentric sleeve (9) being mounted for rotation on an upper portion (10) of the drill bit (2), the most eccentric portion of the sleeve being adapted during drilling to lie diametrically opposite the most eccentric portion of the active end portion (1) of the drill bit and which sleeve is adapted, for the purpose of enabling the drill bit to be drawn up through the tube, to be rotated relative to said upper portion (10) through 180, characterized in that the eccentric sleeve (9) has a circular cross section which completely fills the lining tube (8) and is eccentrically mounted around an axis (0) which lies centrally between the drilling axis (a) and the lining tube axis (b) in the position where the eccentric portions of the eccentric sleeve (9) and the active end portion (1) lie axially in line with each other, whereby the drill axis 3 4 (a) and the lining tube axis (b) coincide when the ec- References Cited centric sleeve (9) is rotated, during drilling, to its dia- UNITED STATES PATENTS metrically POSMOH' 1 510 222 9/1924 Herman 175-399 2. A deep drill as claimed in claim 1, characterized in 3:174:5 3 3 19 5 Edblom 175 25 that the eccentric sleeve (9) is provided with an inwardly 5 3,277,972 10/1966 Lagerstrom 175-399 projecting lug (11) adapted to move in a peripherally, CHARLES OCONNELL Primary Examiner 180 extending groove (12) in the upper portion (10) R E FAVREAU Assistant Emml.ner of the drill bit (2) on which the eccentric sleeve (9) is US Cl mounted. 175 399
US619746A 1967-03-01 1967-03-01 Deep drills with eccentric bits Expired - Lifetime US3416616A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753470A (en) * 1970-11-27 1973-08-21 Sandvik Ab Eccentric drill tool
US3848683A (en) * 1972-02-10 1974-11-19 Atlas Copco Ab Method and means for drilling
US3870114A (en) * 1973-07-23 1975-03-11 Stabilator Ab Drilling apparatus especially for ground drilling
US4545443A (en) * 1977-04-29 1985-10-08 Sandvik Aktiebolag Means for drilling
US4620600A (en) * 1983-09-23 1986-11-04 Persson Jan E Drill arrangement
US4682662A (en) * 1985-04-25 1987-07-28 Vladimir Vancura Drill adapter
EP0235105A2 (en) * 1986-02-24 1987-09-02 Santrade Ltd. Drill tool
US4962822A (en) * 1989-12-15 1990-10-16 Numa Tool Company Downhole drill bit and bit coupling
US5009271A (en) * 1990-07-16 1991-04-23 Milan Maric Drill assembly
US5009274A (en) * 1989-04-05 1991-04-23 Uniroc Aktiebolag Laterally adjustable drilling tool
US5052503A (en) * 1989-04-05 1991-10-01 Uniroc Aktiebolag Eccentric drilling tool
US5186265A (en) * 1991-08-22 1993-02-16 Atlantic Richfield Company Retrievable bit and eccentric reamer assembly
US5284216A (en) * 1990-02-19 1994-02-08 Sandvik Ab Down-the-hole drill tool for drilling in advance of a casing tube
WO1999007977A1 (en) * 1997-08-08 1999-02-18 Sandvik Ab (Publ) Drilling tool for down-the-hole drilling, reamer means and body element for use in the tool
EP1412605A2 (en) * 2001-06-29 2004-04-28 Rotary Drilling Technology, LLC. Improved stabilizer for use in a drill string
DE102008028997A1 (en) 2008-06-20 2010-01-21 Dr. Sven Becker und Dr. Michael Bahns GbR (vertretungsberechtigter Gesellschafter: Dr. Sven Becker, 30655 Hannover) Drilling method for producing borehole in e.g. earth in residential area, involves converting electric and/or hydraulic energy into mechanical energy in borehole for propulsion and driving of drilling tool
ITPD20080294A1 (en) * 2008-10-17 2010-04-18 Comacchio S R L PUNCHING SYSTEM FOR HAMMER, BOTTOM OF THE HOLE, ECCENTRICALLY OPERATED

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1510222A (en) * 1920-07-09 1924-09-30 Herman John Henry Expansion percussion bit for drilling or boring operations
US3174563A (en) * 1962-03-01 1965-03-23 Skanska Cementgjuteriet Ab Deep drills having an eccentric bit
US3277972A (en) * 1962-07-09 1966-10-11 Atlas Copco Ab Rock drilling equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1510222A (en) * 1920-07-09 1924-09-30 Herman John Henry Expansion percussion bit for drilling or boring operations
US3174563A (en) * 1962-03-01 1965-03-23 Skanska Cementgjuteriet Ab Deep drills having an eccentric bit
US3277972A (en) * 1962-07-09 1966-10-11 Atlas Copco Ab Rock drilling equipment

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753470A (en) * 1970-11-27 1973-08-21 Sandvik Ab Eccentric drill tool
US3848683A (en) * 1972-02-10 1974-11-19 Atlas Copco Ab Method and means for drilling
US3870114A (en) * 1973-07-23 1975-03-11 Stabilator Ab Drilling apparatus especially for ground drilling
US4545443A (en) * 1977-04-29 1985-10-08 Sandvik Aktiebolag Means for drilling
US4620600A (en) * 1983-09-23 1986-11-04 Persson Jan E Drill arrangement
US4682662A (en) * 1985-04-25 1987-07-28 Vladimir Vancura Drill adapter
AU605756B2 (en) * 1986-02-24 1991-01-24 Santrade Limited Drill tool
EP0235105A2 (en) * 1986-02-24 1987-09-02 Santrade Ltd. Drill tool
EP0235105A3 (en) * 1986-02-24 1988-12-07 Santrade Ltd. Drill tool
US4770259A (en) * 1986-02-24 1988-09-13 Santrade Limited Drill tool
US5052503A (en) * 1989-04-05 1991-10-01 Uniroc Aktiebolag Eccentric drilling tool
US5009274A (en) * 1989-04-05 1991-04-23 Uniroc Aktiebolag Laterally adjustable drilling tool
US4962822A (en) * 1989-12-15 1990-10-16 Numa Tool Company Downhole drill bit and bit coupling
US5284216A (en) * 1990-02-19 1994-02-08 Sandvik Ab Down-the-hole drill tool for drilling in advance of a casing tube
US5009271A (en) * 1990-07-16 1991-04-23 Milan Maric Drill assembly
US5186265A (en) * 1991-08-22 1993-02-16 Atlantic Richfield Company Retrievable bit and eccentric reamer assembly
WO1999007977A1 (en) * 1997-08-08 1999-02-18 Sandvik Ab (Publ) Drilling tool for down-the-hole drilling, reamer means and body element for use in the tool
EP1412605A2 (en) * 2001-06-29 2004-04-28 Rotary Drilling Technology, LLC. Improved stabilizer for use in a drill string
EP1412605A4 (en) * 2001-06-29 2006-01-04 Rotary Drilling Technology Llc Improved stabilizer for use in a drill string
DE102008028997A1 (en) 2008-06-20 2010-01-21 Dr. Sven Becker und Dr. Michael Bahns GbR (vertretungsberechtigter Gesellschafter: Dr. Sven Becker, 30655 Hannover) Drilling method for producing borehole in e.g. earth in residential area, involves converting electric and/or hydraulic energy into mechanical energy in borehole for propulsion and driving of drilling tool
ITPD20080294A1 (en) * 2008-10-17 2010-04-18 Comacchio S R L PUNCHING SYSTEM FOR HAMMER, BOTTOM OF THE HOLE, ECCENTRICALLY OPERATED

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