EP0434009A1 - Trepan et procédé de forage - Google Patents

Trepan et procédé de forage Download PDF

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Publication number
EP0434009A1
EP0434009A1 EP90124676A EP90124676A EP0434009A1 EP 0434009 A1 EP0434009 A1 EP 0434009A1 EP 90124676 A EP90124676 A EP 90124676A EP 90124676 A EP90124676 A EP 90124676A EP 0434009 A1 EP0434009 A1 EP 0434009A1
Authority
EP
European Patent Office
Prior art keywords
drill bit
drilling
drill
head
front face
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.)
Withdrawn
Application number
EP90124676A
Other languages
German (de)
English (en)
Inventor
Walter Weber
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.)
Schwarz Guenter
Original Assignee
Schwarz Guenter
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 Schwarz Guenter filed Critical Schwarz Guenter
Publication of EP0434009A1 publication Critical patent/EP0434009A1/fr
Withdrawn legal-status Critical Current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
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids

Definitions

  • the present invention relates to a drilling head for earth drills and a method for earth drilling.
  • a flushing device for rock and gravel drills which has an annular nozzle for generating an air flow directed in the opposite direction to the drilling feed. This flushing device ensures that the boring bar is flowed at least approximately in a ring.
  • the present invention aims to further increase the drilling capacity, both for soil in the form of rock layers and for gravel soils.
  • a drilling head for earth drills fulfilling this task is characterized by one of the claims.
  • the invention also includes a method as defined in one of claims 5 or 6.
  • Fig. 1 shows an axial section through a drill head 1, with a front part designated as drill bit 3.
  • the drill head is rotationally symmetrical and has a longitudinal axis 4.
  • the front face of the drill bit 6 is provided with drilling elements 9 arranged symmetrically with respect to the longitudinal axis 4, the cutting edges of which run essentially radially.
  • This front surface 6 furthermore has guide cams 10 which are provided radially inside the drilling members 9 and which are arranged asymmetrically with respect to the longitudinal axis 4.
  • FIG. 3 The shape of the rear drill head end surface 7 is seen in supervision in Fig. 3.
  • This figure also shows a central threaded bore 11 with a special thread for connecting the drill head 1 to the drill pipe (not shown).
  • an inflow bore 13 to the drill bit 3 can be seen, which forms the continuation of an inflow channel in the drill pipe.
  • This central inflow bore 13 opens into a distribution chamber 14, from which, with respect to the longitudinal axis 4, symmetrical and essentially parallel to it run propellant air channels 16, while in the middle a wash channel 17 opens out from the distribution chamber 14 into the drill bit front surface 6.
  • flushing channels 17 essentially parallel to the longitudinal axis 4, wherein these flushing channels 17 can run symmetrically or optionally asymmetrically to the longitudinal axis 14.
  • air with a supercritical pressure is supplied through the inflow bore 13 into the distribution chamber 14 through the central feed channel of the drill pipe, wherein there is normally also a supercritical air pressure in the distribution chamber 14, which allows the air from the propellant air channels 16 to travel at the speed of sound at most , flows essentially parallel to the longitudinal axis 4.
  • the air emerging from the wash channel 17 in the drilling direction also has at most the speed of sound. After it emerges between the drill base and the front face 6 of the drill bit, it becomes 90 ° deflected and flows essentially radially outwards, their speed decreasing in accordance with the widening flow cross section.
  • This air from the floating channel 17 - it can, as mentioned, also be several such channels - conveys the cuttings in the direction towards the outer edge of the drill bit front surface 6, this movement being supported by the outwardly increasing rotational speed of the drill head 1.
  • the air speed from the wash channel 17 has reached such a low value that its kinetic energy is no longer able to uncover hollows in its flow direction even on soft soils and in particular also on gravel soils, which as known, would hinder the conveying process of the cuttings to be conveyed pneumatically.
  • this air speed or the air quantity is large enough to convey the cuttings as far as possible into the area of the driving air ducts 16, the air jets of which then ensure that the cuttings climb up in the pneumatic transport process.
  • the floating channel 17 preferably has a diameter of 1.5 to 4 mm with a drill bit front surface diameter of 80 to 110 mm. It has proven to be advantageous, in particular for an outer diameter of the drill bit front surface of 89 mm, to have a mouth diameter of the floating channel 17 of 2 mm.
  • the operating pressure of the compressed air fed to the drill head is between 6 and 20 bar, whereby at a pressure of 10 bar an air consumption of approximately 10m3 / min is required.
  • the drilling head described also has no laterally opening bores and no bores through which air emerges with a radial component which is noticeable with respect to the longitudinal axis 4.
  • Diagram 4 shows the outer diameter D of the drill bit from 80 to 110mm as a parameter depending on the speeds c x between the front face of the drill bit and the ground, which are safe or relevant for the hollowing out of the side walls Function of the outlet diameter d of the floating channel 17 specified. From the continuity equation it follows that with a diameter of the drill bit front surface of D x and a corresponding speed c x , with a gap height of h (FIG. 1) between the drill bit front surface 6 and the earth approximately the relationship applies, for example the speed of sound can mean what leads to the choice area shown in FIG. 4.

Landscapes

  • 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)
EP90124676A 1989-12-20 1990-12-19 Trepan et procédé de forage Withdrawn EP0434009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH456689 1989-12-20
CH4566/89 1989-12-20

Publications (1)

Publication Number Publication Date
EP0434009A1 true EP0434009A1 (fr) 1991-06-26

Family

ID=4278475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124676A Withdrawn EP0434009A1 (fr) 1989-12-20 1990-12-19 Trepan et procédé de forage

Country Status (1)

Country Link
EP (1) EP0434009A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2347884C2 (ru) * 2003-06-12 2009-02-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Ударное буровое долото, бурильная система и способ бурения скважины в подземной формации

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1764989A (en) * 1927-03-14 1930-06-17 Carl A Signell Drill
US3299974A (en) * 1963-10-01 1967-01-24 P & V Mining & Engineering Ltd Percussive drill bits
GB1071418A (en) * 1963-08-19 1967-06-07 P & V Mining & Engineering Ltd Improvements in rock-drilling tools
US3542142A (en) * 1968-09-27 1970-11-24 Gulf Research Development Co Method of drilling and drill bit therefor
US4231283A (en) * 1978-11-01 1980-11-04 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Pulsating liquid jet gun and method of operating the same
US4499957A (en) * 1982-11-22 1985-02-19 Gerald Adcock Method for removing earth cuttings from holes being formed by a pneumatically exhausted drill tool

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1764989A (en) * 1927-03-14 1930-06-17 Carl A Signell Drill
GB1071418A (en) * 1963-08-19 1967-06-07 P & V Mining & Engineering Ltd Improvements in rock-drilling tools
US3299974A (en) * 1963-10-01 1967-01-24 P & V Mining & Engineering Ltd Percussive drill bits
US3542142A (en) * 1968-09-27 1970-11-24 Gulf Research Development Co Method of drilling and drill bit therefor
US4231283A (en) * 1978-11-01 1980-11-04 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Pulsating liquid jet gun and method of operating the same
US4499957A (en) * 1982-11-22 1985-02-19 Gerald Adcock Method for removing earth cuttings from holes being formed by a pneumatically exhausted drill tool

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Composite catalog of oil field equipment and services", Auflage 38, Band 3, 1988, Seiten 3346-3348, Gulf Publishing Co., Houston, US *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2347884C2 (ru) * 2003-06-12 2009-02-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Ударное буровое долото, бурильная система и способ бурения скважины в подземной формации

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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