US3390730A - Apparatus for lining a borehole as a boring bit advances in the ground - Google Patents

Apparatus for lining a borehole as a boring bit advances in the ground Download PDF

Info

Publication number
US3390730A
US3390730A US530201A US53020166A US3390730A US 3390730 A US3390730 A US 3390730A US 530201 A US530201 A US 530201A US 53020166 A US53020166 A US 53020166A US 3390730 A US3390730 A US 3390730A
Authority
US
United States
Prior art keywords
lining
boring bit
ground
diameter
bit
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
US530201A
Other languages
English (en)
Inventor
Marcel Leon Emile Ghisla Techy
Pierre Andre Emile Stenuick
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.)
Carrier & Ateliers Stenuick Fr
Carrier & Ateliers Stenuick Freres S P R L
Original Assignee
Carrier & Ateliers Stenuick Fr
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 Carrier & Ateliers Stenuick Fr filed Critical Carrier & Ateliers Stenuick Fr
Application granted granted Critical
Publication of US3390730A publication Critical patent/US3390730A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1078Stabilisers or centralisers for casing, tubing or drill pipes
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK 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 OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/084Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with flexible drawing means, e.g. cables
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00Drives for drilling, used in the borehole
    • E21B4/06Down-hole impacting means, e.g. hammers
    • E21B4/14Fluid operated hammers
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK 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
    • E21B7/208Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Definitions

  • Our invention relates to apparatus for lining a borehole as a boring bit advances in the ground.
  • apparatus for lining a borehole as a boring bit advances in the ground comprising a striking element having an eccentric boring bit which can be inscribed in a circle of diameter d and a lining whose internal diameter d is greater than the diameter al in which the boring bit can be inscribed and whose external diameter d is smaller than the hole diameter d in such a manner the lining can penetrate easily into the hole already bored and enable the boring bit to be inserted and withdrawn.
  • the apparatus further comprises a vertical slideway on which two assemblies are movable, the first assembly comprising a first carriage and, mounted thereon, a motor for rotating a set of rods to whose lower end the striking element bearing the boring bit is connected, the second assembly comprising a second carriage, to which a motor is secured, and which is provided with a passage through which the rods, striking element and boring bit can pass, the second carriage having rigidly connected to it a lining element having secured at its lower end guide projections serving to keep the striking element correctly centered relative to the lining element.
  • FIG. 1 is a diagrammatic view of the apparatus
  • FIG. 2 is a view in enlarged scale of a portion of the apparatus in elevation and partly in section;
  • FIGS. 3-5 are views of details showing the boring operation and the member of use.
  • FIGS. 3a, 4a, 5a are sections on the lines III-III, IVIV and V--V in FIGS. 3, 4 and 5 respectively.
  • the apparatus comprises a bearing frame 1 which can be, for instance, of the tracklaying kind and which can move along the ground and which has a vertical slideway 2 (FIGS. 1 and 2); two assemblies 3, 4 are vertically movable on the slideway 2.
  • the assembly 3 comprises a carriage 5 having mounted thereon a motor 6 for driving an assembly of rods 7 having secured at its lower end a striking element formed by a striking hammer 8 having a boring bit 9 at its lower end. A reduced-diameter portion 8 narrower than the hammer 8 is provided between the hammer 8 and the boring bit 9.
  • the motor 6 and striking element can be pneumatic, in which event they are supplied with compressed air by means of a compressor and air lines (not shown).
  • the system formed by the elements 5-9 serves to bore holes in the ground; the assembly of rods 7 is rotated by the motor 6 and drives by its rotation the hammer 8 and the boring bit 9. The bit therefore experiences consecutive blows and a rotary movement.
  • the second system 4 comprises a carriage 10 on which a motor 11 is mounted and which also comprises a passage 12 through which the rods 7, element 8 and boring bit 9 can pass.
  • a lining 13 formed of interconnected lining elements is rigidly connected to the carriage 10; guide projections 13 which are, as a rule, four in number are secured to the lower end of the lining 13 in order to maintain the striking element 8 in the correct concentric relationship relative to the lining elements of lining 13.
  • the assemblies 3, 4 are raised and lowered by winches 14, 15 connected respectively to the carriage 5 by a chain 16 running over guide rollers 17, and to the carriage 10 by a chain running over guide rollers 19.
  • This invention is based on the following principle (FIG. 3):
  • the lining 13 has the following capabilities:
  • the winches 14, 15 place the assemblies 3, 4 near the top of the slideway 2, as shown in FIG. 2.
  • the various items, namely the lining element 13, rods 7, hammer 8 and boring bit 9 are brought to the position shown in FIG. 2.
  • the boring bit 9 is rotated by the rods 7 (which are driven by the motor 6) and struck by the hammer 8 and thereby drills or bores a hole of diameter d (FIG. 3) in the ground.
  • the lining element 13 of diameter d. is rotated by the motor 11 for ready penetration into the ground, penetration being made difficult by friction between the lining element 13 and the ground.
  • the lining element 13 therefore penetrates readily into the ground in the wake of the boring bit 9.
  • drilling elements When drilling is completed and it is required to leave the lining elements in the ground, the drilling elements are withdrawn as follows:
  • the lining-driving assembly 4 is now at the bottom of the slideway 2.
  • the winch 15 of the assembly 3 raises a the rods 7 slightly until the hammer 8 is raised above the centering projections 13 (FIG. 4) of the driving element 13 and the projections 13 are opposite the part 8
  • the mechanism for rotating the rods 7 is then operated to shift the position of the boring bit 9 as shown in FIG. a so that the centering projections 13 take up a position in alignment with the recesses of the boring bit 9 so that the bit can enter the lining element 13 when it is raised by means of the winch 15 and the cables and pulleys 16, 17 (FIG. 5). Further withdrawal of the elements 79 is then effected by means of the winch 15 and cable 16.
  • the rod-driving assembly 3 is first raised to the top of the slideway, whereafter the lining elements can be raised by means of the winch 14 and cable 18.
  • Boring apparatus comprising a vertical slideway, first and second assemblies supported on the slideway for vertical movement, the first assembly comprising a carriage,
  • a rod assembly supported from said carriage, drive means 1 on said carriage coupled to said rod assembly for driving the same in rotation, and a striking element constituted as a hammer and an eccentric boring bit, said striking element being coupled to said rod assembly for undergoing rotation therewith, said boring bit being dimensioned such that it can be inscribed in a circle of diameter d whereas it generates a circle of diameter d to bore a hole of such diameter, said second assembly comprising a second carriage having a passageway through which the rod assembly, striking element and boring bit can pass, a lining element supported by said second carriage and second drive means on the second carriage for driving said lining element in rotation, said lining element encircling the rod assembly and hammer, the boring bit extending from the lining element during a boring operation, said lining element having an internal diameter d which is greater than the diameter d of the circle in which the boring bit can be inscribed, and an external diameter which is smaller than the diameter d of the hole bored by such bit under the conjoint action of the rotation of the rod assembly and
  • Apparatus as claimed in claim 1 comprising cables and winches coupled to the first and second assemblies to raise and lower the same along the slideway.
  • Apparatus as claimed in claim 1 comprising a hearing framework movable along the ground, said slideway being rigidly connected to said bearing framework for movement therewith.
  • Apparatus as claimed in claim 4 comprising means coupled to the first and second assemblies to raise and lower the same along the slideway, said lining elements being removable from the bored hole by successively raising and lowering the second assembly and decoupling and removing the lining elements one by one.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
US530201A 1965-10-07 1966-02-25 Apparatus for lining a borehole as a boring bit advances in the ground Expired - Lifetime US3390730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE18810 1965-10-07

Publications (1)

Publication Number Publication Date
US3390730A true US3390730A (en) 1968-07-02

Family

ID=3839901

Family Applications (1)

Application Number Title Priority Date Filing Date
US530201A Expired - Lifetime US3390730A (en) 1965-10-07 1966-02-25 Apparatus for lining a borehole as a boring bit advances in the ground

Country Status (8)

Country Link
US (1) US3390730A (fr)
BE (1) BE670646A (fr)
DE (1) DE1242166B (fr)
ES (1) ES320669A1 (fr)
FR (1) FR1452421A (fr)
GB (1) GB1143194A (fr)
NL (1) NL6600154A (fr)
SE (1) SE320040B (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645343A (en) * 1970-05-11 1972-02-29 Gordon E Mays Rotary drilling machine
US3674100A (en) * 1970-08-12 1972-07-04 Norman D Becker Method and apparatus for drilling and casing a large diameter borehole
US3730285A (en) * 1971-10-08 1973-05-01 Gardner Denver Co Rock drill bit guide and mast stabilizer
US3958648A (en) * 1974-02-18 1976-05-25 Bpa Byggproduktion Ab Drilling equipment
US4003440A (en) * 1974-09-17 1977-01-18 Tidril Corporation Apparatus and process for drilling underground arcuate paths utilizing directional drill and following liner
US4148367A (en) * 1977-03-14 1979-04-10 Reich Wendell L Well drilling apparatus
US4296821A (en) * 1980-02-07 1981-10-27 Leslie Larson Drilling rig and conversion apparatus
US4415047A (en) * 1980-11-24 1983-11-15 Adcock Gerald L Downhole case driving apparatus for impact drills
EP0122540A2 (fr) * 1983-04-14 1984-10-24 Kabushiki Kaisha Iseki Kaihatsu Koki Procédé et installation de poussée pour bouclier de tunnel
US4553612A (en) * 1983-11-09 1985-11-19 Durham Marion E Earth boring machine
TR22640A (tr) * 1984-05-22 1988-01-29 Iseki Kaihatsu Koki Tuenel acmada kullanilmak uezere bir siperin sueruelmesine mahsus usul ve cihaz
EP0563950A1 (fr) * 1992-04-02 1993-10-06 Ing. Anton Loibelsberger jun. Appareil et procédé pour le forage dirigé
US5503224A (en) * 1994-06-28 1996-04-02 Big Iron Drilling Ltd. Casing drive apparatus
DE19509379A1 (de) * 1995-03-15 1996-09-19 Fromme Theo Dipl Ing Fh Hydraulische Verrohrungsmaschine als Anbaugerät für eine mobile Drehbohranlage
WO1997014867A1 (fr) * 1995-10-20 1997-04-24 Roeynestad Tom Toralv Procede et dispositif servant a remonter un tubage ou autre d'un trou fore et a l'introduire dans ce trou
US6471445B2 (en) * 2000-01-20 2002-10-29 Compagnie Du Sol Rotary displacement piling equipment
WO2005085582A1 (fr) * 2004-03-10 2005-09-15 Sandvik Intellectual Property Ab Appareil de forage en un seul passage, utilisation d'un trepan monobloc, procede et boulon d'ancrage pour boulonnage des roches en un seul passage.
US20080205994A1 (en) * 2007-02-14 2008-08-28 Sandvik Intellectual Property Ab Drill bit and a single pass drilling apparatus
WO2011153584A1 (fr) * 2010-06-08 2011-12-15 Strange Investments (Wa) Pty Ltd Appareil de vissage de tubage
US20220341264A1 (en) * 2021-04-22 2022-10-27 Abi Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft Mbh Construction machine for special civil engineering

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795205A (fr) * 1972-02-10 1973-05-29 Atlas Copco Ab Procede et appareillage pour le forage rotatif
JPS51128602A (en) * 1975-05-02 1976-11-09 Furukawa Kogyo Kk Eccentric bit device for drilling machine
SE414417B (sv) * 1975-12-11 1980-07-28 Craelius Ab Bergborrmaskin
FR2409373A1 (fr) * 1977-11-21 1979-06-15 Stenuick France Dispositif de forage de trous dans le sol, comportant un marteau pneumatique equipe d'un taillant excentre
DE2824722C3 (de) * 1978-06-06 1984-01-19 Ing. Günter Klemm, Spezialunternehmen für Bohrtechnik, 5962 Drolshagen Drehschlag-Bohrvorrichtung
DE2924392C2 (de) * 1979-06-16 1982-09-23 Brückner Grundbau GmbH, 4300 Essen Bohrvorrichtung zum Überlagerungsbohren
DE3326303C2 (de) * 1983-07-21 1991-01-03 Karl Bauer Spezialtiefbau GmbH & Co KG, 8898 Schrobenhausen Vorrichtung zum Herstellen verrohrter Bohrungen
SE454196C (sv) * 1983-09-23 1991-11-04 Jan Persson Jord- och bergborrningsanordning foer samtidig borrning och infodring av borrhaalet
DE3414206C1 (de) * 1984-04-14 1985-02-21 Norton Christensen, Inc., Salt Lake City, Utah Drehbohrmeissel fuer Tiefbohrungen
DE3901664A1 (de) * 1989-01-20 1990-07-26 Bauer Spezialtiefbau Verfahren zum ziehen von aussengestaengen
DE19529554C2 (de) * 1995-08-11 1999-04-29 Klemm Guenter Bohr- und/oder Injektionsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1869892A (en) * 1929-05-25 1932-08-02 Donald C Grove Well drill
US2784942A (en) * 1955-01-11 1957-03-12 California Research Corp Apparatus for simultaneously drilling and casing shot holes
US2979143A (en) * 1958-05-29 1961-04-11 Charles W Kandle Vertical drill system for installing pipe
US3190378A (en) * 1962-09-18 1965-06-22 Sr Paul H Davey Apparatus for simultaneously drilling and casing a well hole

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301354A (fr) * 1961-07-05 1962-08-17 Dispositif de forage léger
DE1188014B (de) * 1962-07-09 1965-03-04 Atlas Copco Ab Gesteinsbohrgeraet mit exzentrisch arbeitendem Bohrwerkzeug
DE1187566B (de) * 1962-07-10 1965-02-25 Sandvikens Jernverks Ab Bohrwerkzeug fuer das Schlagbohren mit einem sich drehenden Bohrer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1869892A (en) * 1929-05-25 1932-08-02 Donald C Grove Well drill
US2784942A (en) * 1955-01-11 1957-03-12 California Research Corp Apparatus for simultaneously drilling and casing shot holes
US2979143A (en) * 1958-05-29 1961-04-11 Charles W Kandle Vertical drill system for installing pipe
US3190378A (en) * 1962-09-18 1965-06-22 Sr Paul H Davey Apparatus for simultaneously drilling and casing a well hole

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645343A (en) * 1970-05-11 1972-02-29 Gordon E Mays Rotary drilling machine
US3674100A (en) * 1970-08-12 1972-07-04 Norman D Becker Method and apparatus for drilling and casing a large diameter borehole
US3730285A (en) * 1971-10-08 1973-05-01 Gardner Denver Co Rock drill bit guide and mast stabilizer
US3958648A (en) * 1974-02-18 1976-05-25 Bpa Byggproduktion Ab Drilling equipment
US4003440A (en) * 1974-09-17 1977-01-18 Tidril Corporation Apparatus and process for drilling underground arcuate paths utilizing directional drill and following liner
US4148367A (en) * 1977-03-14 1979-04-10 Reich Wendell L Well drilling apparatus
US4296821A (en) * 1980-02-07 1981-10-27 Leslie Larson Drilling rig and conversion apparatus
US4415047A (en) * 1980-11-24 1983-11-15 Adcock Gerald L Downhole case driving apparatus for impact drills
EP0122540A2 (fr) * 1983-04-14 1984-10-24 Kabushiki Kaisha Iseki Kaihatsu Koki Procédé et installation de poussée pour bouclier de tunnel
EP0122540A3 (en) * 1983-04-14 1986-08-13 Kabushiki Kaisha Iseki Kaihatsu Koki Method and apparatus for thrusting a shield for use in tunneling
US4553612A (en) * 1983-11-09 1985-11-19 Durham Marion E Earth boring machine
TR22640A (tr) * 1984-05-22 1988-01-29 Iseki Kaihatsu Koki Tuenel acmada kullanilmak uezere bir siperin sueruelmesine mahsus usul ve cihaz
EP0563950A1 (fr) * 1992-04-02 1993-10-06 Ing. Anton Loibelsberger jun. Appareil et procédé pour le forage dirigé
US5503224A (en) * 1994-06-28 1996-04-02 Big Iron Drilling Ltd. Casing drive apparatus
DE19509379A1 (de) * 1995-03-15 1996-09-19 Fromme Theo Dipl Ing Fh Hydraulische Verrohrungsmaschine als Anbaugerät für eine mobile Drehbohranlage
WO1997014867A1 (fr) * 1995-10-20 1997-04-24 Roeynestad Tom Toralv Procede et dispositif servant a remonter un tubage ou autre d'un trou fore et a l'introduire dans ce trou
US6047771A (en) * 1995-10-20 2000-04-11 Roeynestad; Tom Toralv Method and a device for hauling a casing or the like up from a bore hole and for inserting the same down to a bore hole
US6471445B2 (en) * 2000-01-20 2002-10-29 Compagnie Du Sol Rotary displacement piling equipment
WO2005085582A1 (fr) * 2004-03-10 2005-09-15 Sandvik Intellectual Property Ab Appareil de forage en un seul passage, utilisation d'un trepan monobloc, procede et boulon d'ancrage pour boulonnage des roches en un seul passage.
JP2007528459A (ja) * 2004-03-10 2007-10-11 サンドビック インテレクチュアル プロパティー アクティエボラーグ ワンパス穿孔装置
US20070274788A1 (en) * 2004-03-10 2007-11-29 Pierre Ravat Single Pass Drilling Apparatus, Use of a One-Piece Drill Bit, Method and Rock Bolt for Single Pass Rock Bolting
US20080205994A1 (en) * 2007-02-14 2008-08-28 Sandvik Intellectual Property Ab Drill bit and a single pass drilling apparatus
US7766103B2 (en) 2007-02-14 2010-08-03 Sandvik Intellectual Property Ab Drill bit and a single pass drilling apparatus
WO2011153584A1 (fr) * 2010-06-08 2011-12-15 Strange Investments (Wa) Pty Ltd Appareil de vissage de tubage
US20220341264A1 (en) * 2021-04-22 2022-10-27 Abi Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft Mbh Construction machine for special civil engineering
US12037860B2 (en) * 2021-04-22 2024-07-16 Abi Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft Mbh Construction machine for special civil engineering

Also Published As

Publication number Publication date
SE320040B (fr) 1970-02-02
ES320669A1 (es) 1966-06-01
BE670646A (fr)
FR1452421A (fr) 1966-02-25
DE1242166B (de) 1967-06-15
NL6600154A (fr) 1967-04-10
GB1143194A (en) 1969-02-19

Similar Documents

Publication Publication Date Title
US3390730A (en) Apparatus for lining a borehole as a boring bit advances in the ground
US4226288A (en) Side hole drilling in boreholes
US3945444A (en) Split bit casing drill
DE60116755T2 (de) Verfahren zum bohren mit einem futterrohr
US5211715A (en) Coring with tubing run tools from a producing well
US4497381A (en) Earth drilling apparatus and method
US3507338A (en) Hole-forming and post-driving apparatus
US2837324A (en) Apparatus for drilling large holes between galleries
CN106346616A (zh) 硬岩承台绳锯切割设备
US2746719A (en) Drilling device for large bores
US5125464A (en) Drilling device for the study and exploitation of the subsoil
GB1452751A (en) Drilling system and method of pulling it up
GB946697A (en) Improvements in apparatus for drilling in earth covered rock
US3656563A (en) Apparatus and method for inserting casing beneath roadbeds
DE59711937D1 (de) Verfahren und Vorrichtung zum Horizontalbohren und zum Handhaben von Bohrstangen
US3097693A (en) Method of perforation of well pipe
CA1128034A (fr) Adaptateur pour carre d'entrainement
CN108843355A (zh) 一种机械锚固装置
GB1294066A (en) Earth boring machine with multi-motor drive
CN205823182U (zh) 一种新型的自动钻机
CN210888815U (zh) 一种煤矿巷道防治水专用钻探装置
DE3326303C2 (de) Vorrichtung zum Herstellen verrohrter Bohrungen
CN206233885U (zh) 一种可快速更换钻头的卸扣器
US2771269A (en) Enlarging bore holes by pellet drilling
CN110792392B (zh) 一种复合式钻井方法