EP0352979A2 - Dispositif de forage à amplitude variable - Google Patents

Dispositif de forage à amplitude variable

Info

Publication number
EP0352979A2
EP0352979A2 EP89307415A EP89307415A EP0352979A2 EP 0352979 A2 EP0352979 A2 EP 0352979A2 EP 89307415 A EP89307415 A EP 89307415A EP 89307415 A EP89307415 A EP 89307415A EP 0352979 A2 EP0352979 A2 EP 0352979A2
Authority
EP
European Patent Office
Prior art keywords
housing
variable amplitude
rotor
drill
drill string
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Withdrawn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
EP89307415A
Other languages
German (de)
English (en)
Other versions
EP0352979A3 (fr
Inventor
Martin Arthur Bollands
David Chinery
Thimothy Ray Woolmington
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.)
BP PLC
Original Assignee
BP PLC
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 BP PLC filed Critical BP PLC
Publication of EP0352979A2 publication Critical patent/EP0352979A2/fr
Publication of EP0352979A3 publication Critical patent/EP0352979A3/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Withdrawn legal-status Critical Current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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
    • B06B1/162—Making use of masses with adjustable amount of eccentricity
    • 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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors

Definitions

  • This invention relates to a variable amplitude drill suitable for use in vibratory drilling equipment for unconsolidated formations, such as soil, sand and gravel or similar materials.
  • Vibratory drilling is a known technique in which a formation is penetrated by vibrating a drill string without rotating it.
  • the vibration is caused by the rotation of an eccentric or unbalanced rotor. This allows cores to be obtained with minimum disturbance from their in-situ condition.
  • the drill string is fitted at its lower end with a bit, otherwise known as a shoe, to provide a cutting edge.
  • the shoe is generally in the form of a hollow cone with a smoothly tapering exterior wall.
  • the frequency of vibration is often in the sonic range, in which case the technique is known as sonic drilling.
  • British Patent Specification 2152100B discloses a vibratory, core drill apparatus comprising: a housing; an eccentric member rotatably mounted in the housing for vibrating the apparatus when the eccentric member is rotated about an axis of rotation, the eccentric member being sealingly received within the hollow interior of the housing so the hollow interior can hold an oil bath for the eccentric member; means for connecting a rotating power source to the eccentric member to rotate the eccentric member; and means for connecting to the housing a core drill barrel with a longitudinal axis so that the longitudinal axis is perpendicular to the axis of rotation of the eccentric member.
  • Reasons for refusal include: (1) congestion of the tube with core material which, due to friction on the inside of the tube, damps the vibrations, (2) friction between the outside of the tube and the formation which again attenuates the vibrations, and (3) inability of the shoe to break down the formation around its cutting edge so allowing it to be displaced from the contact zone and allowing the tube movement to progress.
  • the drill string oscillates in a sinusoidal fashion with an amplitude which is determined by the eccentricity of the rotor. This oscillation is transferred to the shoe except in the unlikely event of the shoe finding itself at a node. The oscillation is damped to some extent by the formation through which the drill string and shoe are drilling, but still remains to a greater or lesser extent.
  • a perceptible, but small, amplitude of oscillation is desirable to prevent the drill string from jamming in the hole.
  • a large amplitude is undesirable because this effectively reduces the area of entry of the core sample to the shoe to that area which is common to the shoe in every position.
  • the natural amplitude i.e. undamped
  • the natural oscillation should be small since there is relatively little damping of the oscillation.
  • the natural oscillation should be greater since the relatively greater damping effect of the formation reduces this to the desired smaller amplitude.
  • a vibratory core drill comprising a housing adapted for connection to a drill string and a variable amplitude rotor mounted in the housing, the variable amplitude rotor comprising a central shaft, an inner shell adjacent to the shaft and an outer shell adjacent to the inner shell, the inner and outer shells being capable of rotation relative to one another and capable of being locked in any desired relationship and released.
  • both inner and outer shells are in the form of semi-cylinders.
  • the inner shell and the central shaft may be integral with one another.
  • the housing may be mounted directly above the drill string so that the axis of rotation of the rotor is perpendicular to the axis of the drill string.
  • the resulting configuration may be orthogonal in that the axis of the drill string is vertical and that of the variable amplitude rotor is horizontal. However, this is not essential and the axis of the variable amplitude rotor may be at an angle to the horizontal or even vertical.
  • the rotor may be driven by a flexible cable attached to a prime mover, such as an internal combustion engine or it may be driven directly by a prime mover mounted on the housing.
  • a prime mover such as an internal combustion engine
  • both inner and outer shells are in the form of semi-cylinders.
  • the shells For minimum amplitude when both shells are in the form of semi-cylinders, the shells should be positioned in the least unbalanced position, i.e. with one facing the other. For maximum amplitude the shells should be positioned in the most unbalanced position, i.e. with the inner resting within the outer. For intermediate amplitudes the shells can be positioned between the extremes.
  • the drill is suitable for use in drilling core samples for evaluating the mineral potential of deposits.
  • variable amplitude rotor comprises a rotor shaft 1, a semi-cylindrical inner shell 2 and a semi-cylindrical outer shell 3.
  • (a) shows the rotor arranged for minimum amplitude for oscillation, (b) for intermediate amplitude and (c) for maximum amplitude.
  • the rotor assembly 4 is connected to a drill string 5 which in turn is connected to a core drilling shoe 6.
  • the maximum out-of-balance oscillation is shown by line 7 and a reduced out-of-balance oscillation by line 8.
  • the variable oscillation amplitude is shown by line 9.
  • variable amplitude rotor 10 is contained within an oil filled housing 11 and mounted on a bearing pack 12.
  • the rotor 10 is driven by a cable drive (not shown) through a connector 13 sealed from the housing by means of an oil seal 14.
  • the housing 11 is clamped around a drill string 15 by means of a pivoted clamp 16.

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)
  • Sampling And Sample Adjustment (AREA)
EP19890307415 1988-07-28 1989-07-20 Dispositif de forage à amplitude variable Withdrawn EP0352979A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8818024 1988-07-28
GB888818024A GB8818024D0 (en) 1988-07-28 1988-07-28 Variable mass rotor

Publications (2)

Publication Number Publication Date
EP0352979A2 true EP0352979A2 (fr) 1990-01-31
EP0352979A3 EP0352979A3 (fr) 1992-02-05

Family

ID=10641276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890307415 Withdrawn EP0352979A3 (fr) 1988-07-28 1989-07-20 Dispositif de forage à amplitude variable

Country Status (4)

Country Link
EP (1) EP0352979A3 (fr)
JP (1) JPH0280785A (fr)
AU (1) AU3884289A (fr)
GB (1) GB8818024D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455994A3 (en) * 1990-04-09 1992-01-02 Bechem, Hannelore Eccentric drive for radially oscillating rollers, rolling cutters and milling drilling tools
DE19732532A1 (de) * 1997-07-29 1999-02-04 Tracto Technik Verfahren zum Richtungsbohren

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932182C (de) * 1953-07-16 1957-03-28 Wolfgang Dr-Ing Herbold Schwingendes Bohrverfahren
US3155163A (en) * 1956-02-20 1964-11-03 Jr Albert G Bodine Method and apparatus for soinc jarring with reciprocating masss oscillator
US3217551A (en) * 1962-03-21 1965-11-16 Jr Albert G Bodine Vibration generator for resonant loads and sonic systems embodying same
US3199614A (en) * 1962-10-03 1965-08-10 Jr Albert G Bodine Sonic wave system for planting utility poles in the ground
US3289774A (en) * 1965-07-14 1966-12-06 Jr Albert G Bodine Vibration isolator for sonic pole driving system
DE1634474A1 (de) * 1966-02-24 1970-08-06 Buckau Wolf Maschf R Ruettelwalze
DE1558869A1 (de) * 1967-05-19 1970-05-06 Wissenschaftlich Tech Zentrum Vibrationsgeraet zur Verdichtung von fein- und grobkoernigen Materialien
GB1183066A (en) * 1967-06-02 1970-03-04 Fyne Machinery & Eng Improvements in and relating to the Driving of Piles, and more especially of Sheet Piling
US3734212A (en) * 1971-08-20 1973-05-22 Bucyrus Erie Co Well drill and casing drive unit
US4073353A (en) * 1976-03-22 1978-02-14 Bodine Albert G Sonic large bore earth auger
US4211121A (en) * 1976-09-01 1980-07-08 Fmc Corporation Vibrator with eccentric weights
CS191531B1 (en) * 1976-11-24 1979-07-31 Stanislav Venc Vibration compacting roller
US4176983A (en) * 1978-07-17 1979-12-04 Ingersoll-Rand Company Variable eccentric device
BE894355A (nl) * 1982-09-10 1983-01-03 Callens Henri E Triller met regelbare trilkracht
GB2152100B (en) * 1983-12-20 1987-12-02 Frederick William Wink Vibratory drill apparatus
DE3515690C1 (de) * 1985-05-02 1986-09-11 Gebr. Lindenmeyer GmbH & Co Maschinenfabrik, 8906 Gersthofen Vibrationsbaer mit Unwuchtverstellung
DE8530160U1 (de) * 1985-09-05 1986-01-30 Krings International GmbH & Co KG, 5138 Heinsberg Vibrationsramme
GB8606711D0 (en) * 1986-03-19 1986-04-23 Andrews R D R Vibratory machines
FR2639376A1 (fr) * 1988-11-24 1990-05-25 Albaret Travaux Publics Sa Engin compacteur vibrant a amplitude modifiable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455994A3 (en) * 1990-04-09 1992-01-02 Bechem, Hannelore Eccentric drive for radially oscillating rollers, rolling cutters and milling drilling tools
DE19732532A1 (de) * 1997-07-29 1999-02-04 Tracto Technik Verfahren zum Richtungsbohren
DE19732532C2 (de) * 1997-07-29 1999-10-28 Tracto Technik Verfahren und Vvorrichtung zum horizontalen Richtungsbohren
US6199643B1 (en) 1997-07-29 2001-03-13 Tracto-Technik Paul Schmidt Spezialmaschinen Method and apparatus for directional boring

Also Published As

Publication number Publication date
JPH0280785A (ja) 1990-03-20
GB8818024D0 (en) 1988-09-01
EP0352979A3 (fr) 1992-02-05
AU3884289A (en) 1990-02-01

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