EP0401191B1 - Lenkbare, selbstangetriebene Bohrvorrichtung - Google Patents

Lenkbare, selbstangetriebene Bohrvorrichtung Download PDF

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Publication number
EP0401191B1
EP0401191B1 EP90870081A EP90870081A EP0401191B1 EP 0401191 B1 EP0401191 B1 EP 0401191B1 EP 90870081 A EP90870081 A EP 90870081A EP 90870081 A EP90870081 A EP 90870081A EP 0401191 B1 EP0401191 B1 EP 0401191B1
Authority
EP
European Patent Office
Prior art keywords
pipe
spraying device
mole
steerable drilling
supports
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
EP90870081A
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English (en)
French (fr)
Other versions
EP0401191A1 (de
Inventor
Marc Jozef Maria Smet
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT90870081T priority Critical patent/ATE99023T1/de
Publication of EP0401191A1 publication Critical patent/EP0401191A1/de
Application granted granted Critical
Publication of EP0401191B1 publication Critical patent/EP0401191B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/065—Deflecting the direction of boreholes using oriented fluid jets

Definitions

  • the invention relates to a steerable drilling mole which includes a hollow round body, a spraying device situated at one end of this body, a pipe for drilling liquid under pressure, which connects to the spraying device, which is supported in the body and which is flexible at least in the body, and at least one moving device situated between the inner side of the body and the pipe.
  • a steerable drilling mole of this kind is disclosed in US-A-4 396 073.
  • the spraying device is mounted in a head which is pivotable mounted by means of a spherical surface element in the front part of the body.
  • a hose for water under high pressure extending through the body, ends in the rear end of the head and directs water under pressure into a central passage way trough this head.
  • Four piston/cylinder units disposed inside the body around the water hose acts directly on the tapered circumferential surface of the inner end of the head for determining the direction of the head.
  • the invention has the purpose of remedying this disadvantage and to provide a steerable drilling mole of the type referred to above of which the construction is very simple and which can be steered in a simple manner.
  • the pipe is supported centrally in the body adjacent the spraying device, respectively at a distance therefrom, by supports and is flexible in such a way that, when the part between the supports bends in one direction, the end of said pipe connected to the spraying device deviates in the opposite direction, and the mole includes at least three moving devices which are arranged between the inner wall of the body and the part of the pipe between the supports, spread over the periphery of the high pressure pipe, for bending the pipe in different directions.
  • WO-A-8 600 111 discloses a directional drilling tool comprising a round body, a bendable pipe supported at both ends therein and a moving device acting on this pipe.
  • this tool is a so-called drilling sub for drilling oil wells carrying on its end a drill bit for loosening the formation and is not a mole carrying on its end a spraying device for spraying drilling liquid under pressure.
  • the bendable pipe is a driving shaft which is hollow to provide for a mud flow passage. Bending of the driving shaft is only possible in one direction.
  • the use of three moving devices for outlining a tool is known as such from FR-A-2 118 328.
  • This tool is however not a drilling tool but a perforating tool and it has neither a spraying device nor a flexible pipe.
  • the three moving devices move radially a rigid perforating element inside a hollow body, without bending this element.
  • each of said moving devices includes an expandable container and means for filling this container separately with fluid under pressure so that it expands.
  • the container can be filled with the same fluid that is also supplied to the spraying device or another fluid under pressure.
  • the means for filling the container can therefore apart from a source of fluid under pressure also include valves, which are mounted for that purpose either on the containers or on separate supply pipes.
  • the supports for the pipe are elastically deformable.
  • one of the supports of the flexible pipe iis formed by a support for the spraying device.
  • the extremity of the body adjecent to the spraying device is preferably sealed around this spraying device by an elastic seal.
  • This elastic seal may advantageously form one of the supports.
  • a tunnel 1 is made in the ground with assistance of a steerable drilling mole 3 according to the invention which drilling mole is mounted upon a flexible drilling pipe 4.
  • the supple drilling pipe 4 is unwound from a drum 5 which is erected above the ground. This drilling pipe 4 has a smaller diameter than the drilling mole 3.
  • the drilling mole 3 and subsequently the drilling pipe 4 enter the ground 2 through a tank 6 with rinsing liquid or water for the supply of hydraulic pressure in the tunnel 1.
  • This tank 6 is mounted over an opening 7 in a plate 8 which lies on the ground 2.
  • An inflated ring 9 which surrounds the opening 7 in the plate 8 and the mouth of the tunnel 1 on the surface of the ground, is placed between the plate 8 and the surface of the ground.
  • the drilling mole 3 is provided with a high pressure spraying device 10 for drilling into the ground.
  • the high pressure fluid for this spraying device 10 is pumped through the flexible drilling pipe 4 by means of a high pressure pump 11.
  • the depth of the drilling mole 3 in the ground can be read from a translucent upper extremity of a pipe 12 situated above the ground 2 which extends along the flexible drilling pipe 4 in the tunnel 1 and with its lower, closed extremity is situated on the front extremity of the drilling mole 3.
  • This pipe 12 is filled with liquid upon which thus on top the atmospheric pressure acts.
  • the level of the liquid in the upper translucent and vertically directed part of the pipe 12 changes in function of the depth of the drilling mole.
  • the drilling mole 3 includes a cylindrical body 13.
  • the spraying device 10 that is itself of a known construction, is mounted centrally in a rubber support 14 which seals off the front extremity of the body 13 and through elastic formation allows the directing of the spraying device 10.
  • This spraying device 10 connects to a flexible but nevertheless relatively stiff high pressure pipe 15 of polyethylene reinforced with fabric.
  • this flexible high pressure pipe 15 is centrally supported by a support 16 in the form of a rubber wall which is directed diagonally to the longitudinal axis of the body 13.
  • a separation wall 17 situated on the rear of the support 16 further holds fast the high pressure pipe 15 in its place in the middle of the body 13. From there the pipe extends out axially into the chamber 18 which is formed on the rear extremity in the body 13 and in which measurement apparatus 19, 20 21 are disposed.
  • This chamber 18 connects to the drilling pipe 4.
  • the flexible high pressure pipe 15 is as a result supported in the front part of the body 13, in front by intervention of the spraying device 10 by the support 14 and further to the back, by the support 16. Between these two supports 14 and 16 the high pressure pipe 15 is surrounded by four inflatable containers 22 which extend in the longitudinal direction of the body 13, between the pipe 15 and the inner side of the body 13.
  • the pipes 23 and 24 of all the containers 22 come together in the body 13, extend into the wall of the chamber 18 and further extend through the drilling pipe 14 out to above the ground where the supply pipes 23 connect to a source of compressed air.
  • the containers 22 are in unexpanded state as represented in the figure 2 and 3.
  • the containers 22 exert no pressure on the part of the high pressure pipe 15 that is situated between the supports 14 and 16 or all four exert the same small pressure, all of which such that the high pressure pipe 15 extends axially.
  • the spraying device 10 is therefore also directed axially and the drilling mole 3 will move in the ground a straight line according to its axis direction when fluid under high pressure is pumped through the pressure pipe 15 and the spraying device 10.
  • three measuring instruments are built into the chamber 18, namely an clinometer 19, a torsion meter 20 and a compass 21.
  • Clinometers of this type are placed on the market by Sperry Corporation and are among others described in the article "Capacitance-based angular measurement" by Tom Donahoe published in the November 1985 issue of "Sensor Magazine".
  • such a clinometer consists of a condenser plate which is divided into two parts and contained between two halves of zinc which form earthing plates. The space between the latter plates is half filled with a dielectric liquid and for the rest with an inert gas.
  • one half of the condenser plate is immersed to a lesser or greater degree in the liquid which gives a change in its capacitance.
  • the compass 21 can be a so-called "fluxgate” compass.
  • Such compasses are on the market and in principle contain a toroidal coil through which an alternating current is sent in order to sense the magnetic field of the earth.
  • the unit is built into a sealed ring of plastic in which this unit flows on a liquid in order more or less to absorb the swing and other movements of the drilling mole 3.
  • the coil is directed horizontally and with rotations it detects very accurately the changes in the magnetic lines of force. These changes are electronically amplified and shown on a screen that is disposed above the ground and is connected to the compass 21 by means of wires not shown in the figures.
  • the compass 21 can also be a stationary compass that consists of three very sensitive magnet sensors which correctly indicate changes in direction according to the azimuth plane, by vector analysis in relation to the drilling plane and by their 120 degree rotation in relation to the axis.
  • the three measuring instruments 19, 20 and 21 are in the chamber 8 still surrounded by a housing 26 of nonmagnetic metal.
  • the construction of the above described drilling mole 3 is relatively simple, but it can be accurately steered and positioned.
  • the containers need not necessarily be inflated with compressed air. They can also be pumped up with liquid under pressure.
  • the drainage pipes of the containers can be partly common and also the supply pipes can be partly common.
  • valves on these pipes need not necessarily be of the known type. They can for that matter also be mounted above the ground on the pipes instead of in the drilling mole, in which case the pipes must then be separate.
  • the spraying device is also not necessarily a hydraulic spraying device. It can also be a pneumatic spraying device in which case no liquid under pressure but then air under pressure is pumped through the high pressure pipes.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Nozzles (AREA)
  • Shovels (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (10)

  1. Lenkbare Bohrvorrichtung (3), umfassend einen runden, hohlen Körper (13), eine an einem Ende dieses Körpers (13) befindliche Sprühvorrichtung (10), eine Leitung (15) für Bohrflüssigkeit unter Druck, die mit der Sprühvorrichtung (10) verbunden ist, in dem Körper (13) gehalten wird und zumindest in dem Körper (13) flexibel ist, und zumindest eine bewegliche Vorrichtung (22), die zwischen der Innenseite des Körpers (13) und der Leitung (15) situiert ist, dadurch gekennzeichnet, daß die Leitung (15) zentral in dem Körper (13), direkt neben der Sprühvorrichtung (10) bzw. in einem Abstand hierzu von Stützen (14 und 16) gehalten wird und derart flexibel ist, daß, wenn der Teil zwischen den Stützen (14 und 16) in eine Richtung gebogen wird, das Ende besagter Leitung (15), das mit der Sprüh-vorrichtung (10) verbunden ist, in die entgegengesetzte Richtung ausweicht, und daß sie zumindest drei bewegliche Vorrichtungen (22) umfaßt, die zwischen der Innenwand des Körpers (13) und dem Teil der Hochdruckleitung (15) zwischen den Stützen (14 und 16) angebracht sind, verteilt über die Peripherie der Hochdruckleitung (15), zum Biegen der Leitung (15) in verschiedene Richtungen.
  2. Lenkbare Bohrvorrichtung (3) gemäß Anspruch 1, dadurch gekennzeichnet, daß jede besagter beweglicher Vorrichtungen (22) einen expandierbaren Behälter (22) und Mittel (23,24,25) zum separaten Füllen dieses Behälters (22) mit unter Druck befindlicher Flüssigkeit, so daß dieser expandiert, umfaßt.
  3. Lenkbare Bohrvorrichtung (3) gemäß Anspruch 2, dadurch gekennzeichnet, daß sie vier expandierbare Behälter (22) umfaßt, die in dem Körper (13) entlang der Leitung (15) und zwischen den Stützen (14 und 16) situiert sind, während Mittel zum Füllen von ein bis drei Behältern (22) vorgesehen sind, so daß diese expandieren können, während der restliche Behälter oder die Behälter komprimiert werden können.
  4. Lenkbare Bohrvorrichtung (3) gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Stützen (14 und 16) elastisch verformbar sind.
  5. Lenkbare Bohrvorrichtung (3) gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das äußere, an die Sprühvorrichtung (10) angrenzende Ende des Körpers (13) mit Hilfe einer elastischen Versiegelung (14) um diese Sprühvorrichtung (10) herum versiegelt ist.
  6. Lenkbare Bohrvorrichtung (3) gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß eine der Stützen (14) der flexiblen Leitung (15) durch eine Stütze für die Sprühvorrichtung (10) gebildet wird.
  7. Lenkbare Bohrvorrichtung (3) gemäß Ansprüchen 5 und 6, dadurch gekennzeichnet, daß die elastische Versiegelung (14) eine der Stützen bildet.
  8. Lenkbare Bohrvorrichtung (3) gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß im Körper (13) ein Klinometer (19), ein Torsionsmeßgerät (20) und ein Kompaß (21) montiert sind.
  9. Lenkbare Bohrvorrichtung (3) gemäß Anspruch 8, dadurch gekennzeichnet, daß zumindest eines der Meßgeräte, gebildet durch den Klinometer (19) und das Torsionsmeßgerät (20), durch einen Klinometer des kapazitiven Typs gebildet wird.
  10. Lenkbare Bohrvorrichtung (3) gemäß Anspruch 8, dadurch gekennzeichnet, daß der Kompaß (21) ein "Fluxgate"-Kompaß ist.
EP90870081A 1989-05-31 1990-05-28 Lenkbare, selbstangetriebene Bohrvorrichtung Expired - Lifetime EP0401191B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90870081T ATE99023T1 (de) 1989-05-31 1990-05-28 Lenkbare, selbstangetriebene bohrvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8900593 1989-05-31
BE8900593A BE1003865A3 (nl) 1989-05-31 1989-05-31 Stuurbare boormol.

Publications (2)

Publication Number Publication Date
EP0401191A1 EP0401191A1 (de) 1990-12-05
EP0401191B1 true EP0401191B1 (de) 1993-12-22

Family

ID=3884189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90870081A Expired - Lifetime EP0401191B1 (de) 1989-05-31 1990-05-28 Lenkbare, selbstangetriebene Bohrvorrichtung

Country Status (5)

Country Link
EP (1) EP0401191B1 (de)
AT (1) ATE99023T1 (de)
BE (1) BE1003865A3 (de)
DE (2) DE69005363D1 (de)
ES (1) ES2019578A4 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1005244A3 (nl) * 1991-01-28 1993-06-08 Smet Marc Jozef Maria Stuurbare boormol.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167194A (en) * 1936-03-14 1939-07-25 Lane Wells Co Apparatus for deflecting drill holes
US2271005A (en) * 1939-01-23 1942-01-27 Dow Chemical Co Subterranean boring
US2873092A (en) * 1957-11-14 1959-02-10 Roy P Dwyer Jet deflection method of deviating a bore hole
AT319999B (de) * 1970-12-03 1975-01-27 Inst Gornogo Dela Sibirskogo O Vorrichtung zum Stabilisieren der Vortriebsrichtung eines zylinderförmigen Vortriebsorganes
US3958641A (en) * 1974-03-07 1976-05-25 Halliburton Company Self-decentralized hydra-jet tool
US4396073A (en) * 1981-09-18 1983-08-02 Electric Power Research Institute, Inc. Underground boring apparatus with controlled steering capabilities
US4597454A (en) * 1984-06-12 1986-07-01 Schoeffler William N Controllable downhole directional drilling tool and method
US4714118A (en) * 1986-05-22 1987-12-22 Flowmole Corporation Technique for steering and monitoring the orientation of a powered underground boring device

Also Published As

Publication number Publication date
ATE99023T1 (de) 1994-01-15
DE401191T1 (de) 1991-04-11
ES2019578A4 (es) 1991-07-01
DE69005363D1 (de) 1994-02-03
BE1003865A3 (nl) 1992-06-30
EP0401191A1 (de) 1990-12-05

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