EP0287548B1 - Vorrichtung zum Verschliessen eines Kernbohrgerätes in einem Bohrstrang - Google Patents

Vorrichtung zum Verschliessen eines Kernbohrgerätes in einem Bohrstrang Download PDF

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Publication number
EP0287548B1
EP0287548B1 EP88870060A EP88870060A EP0287548B1 EP 0287548 B1 EP0287548 B1 EP 0287548B1 EP 88870060 A EP88870060 A EP 88870060A EP 88870060 A EP88870060 A EP 88870060A EP 0287548 B1 EP0287548 B1 EP 0287548B1
Authority
EP
European Patent Office
Prior art keywords
slide
ball
bore
extension piece
core barrel
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
EP88870060A
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English (en)
French (fr)
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EP0287548A1 (de
Inventor
Charles Pierre Hallez
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.)
Diamant Boart NV SA
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Diamant Boart NV SA
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Filing date
Publication date
Application filed by Diamant Boart NV SA filed Critical Diamant Boart NV SA
Publication of EP0287548A1 publication Critical patent/EP0287548A1/de
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Publication of EP0287548B1 publication Critical patent/EP0287548B1/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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
    • 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
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems

Definitions

  • the present invention relates to a device for closing an upper end of a core barrel tube mounted in mining or petroleum sounding equipment, comprising a tube element similar to those constituting the train of tubes and a slide delivering passage through an orifice constriction to a pressurized drilling fluid and comprising a rod and a protruding head guided along an internal profile of a part of the tube, this slide being driven to make a first movement under the effect of an increase in drilling fluid pressure, between an initial position and a distant stable position.
  • This core barrel which can be, for example, of the type described in Belgian patent n ° 875016, comprises on the one hand, a rotating external tube made up of a string of rods and the lower end of which carries a welding ring and , on the other hand, a non-rotating inner tube whose lower end is provided with an extractor cone.
  • drilling fluid is injected from the surface inside the drill string.
  • a core representative of the ground can only be taken when the mucking operation is finished.
  • This annular space is delimited by the internal wall of the lower rod of the drill string and the external face of the internal tube of the core barrel.
  • the flow of drilling fluid is deflected by freely launching, from the end of the drill string opposite the core barrel, a ball intended to close off a seat provided at the upper end of the corer. To accelerate the descent of the ball, it is known to increase the flow of drilling fluid.
  • Document GB-A-2048996 provides for deflecting the flow of drilling liquid by releasing a ball using a release device mounted at the bottom of the drilling device downstream of the inner tube also called core barrel.
  • the release device consists of an annular piston pushed upwards by a helical spring and a sleeve provided with a light.
  • the core barrel is connected, via an inlet channel, to the flow path of the drilling fluid.
  • a stop valve interrupts the flow of the fluid passing through the coring sleeve and deflects said flow in the annular space provided between the outer tube and the coring sleeve, when a ball retained in a lateral housing by the sleeve, is released by the displacement of the light under the push of the piston, when the pressure of the drilling fluid suddenly increases from the surface.
  • This drilling rig has the disadvantage that the ball, at the end of its fall, driven by an excessive flow of drilling liquid, abruptly applies to the above-mentioned seat and causes a water hammer which damages the core barrel and possibly the borehole.
  • the present invention aims to remedy these drawbacks and relates to a device for rapidly closing the seat provided at the upstream end of the core barrel, without causing water hammer in the column of drilling liquid.
  • the device according to the invention for closing the upstream end of a corer is essentially characterized in that it comprises a tube element similar to those constituting the drill string and in the bore of which is guided a slide delivering passage to a pressurized drilling liquid, this slide being driven to carry out a first movement under the effect of an increase in flow of the drilling liquid, between an initial rest position and a distant stable position in which it maintains an element shutter distant from a seat provided at the end of the core barrel and brought back under the effect of a subsequent reduction in flow rate to its initial position, in which it allows this shutter element to be applied on the seat cited above.
  • this closure element can be mounted on the slide, it is preferred, according to a feature of the invention, that this closure element consists of a solid metal ball distinct from the slide.
  • the slide is provided at one end with an appendage directed towards the aforementioned end of the core barrel, this appendage being provided with a protuberance having a shape such that in the initial position of the slide, the appendage retains the ball in a first part of the bore of the tubular element while, in the distant stable position, the protrusion retains the ball in a second part of the bore of the tubular element and allows to drop the ball towards the seat of the corer when the slide occupies again its initial position.
  • the aforementioned appendage of the slide has a free cylindrical end coaxial with the bore of the tubular element.
  • This bore consists of successive coaxial cylindrical parts, a first of these parts having a diameter substantially equal to that of the appendix increased by twice the diameter of the ball, a second of these parts having a diameter greater than that of the free end of the protrusion increased by at least twice the diameter of the ball, while a third part of the bore, adjacent to the second part thereof and located on the side of the aforementioned end of the core barrel has a diameter less than the diameter of the aforementioned free end of the appendix increased by twice the diameter of the ball, so that the slide occupies a stable upper initial position of rest in which the cylindrical end of the appendix allows , when engaged in the second part of the bore, to retain the ball in the first part of this bore and the slide occupies a lower position re stable in which it allows the ball to pass from the first part of the bore into the second part thereof and to be applied on the
  • the slide provided in the device according to the present invention preferably consists of a sleeve having, on the one hand, a throttle orifice for the flow of drilling fluid in the vicinity of its end opposite to that carrying the appendix and on the other hand, a series of divergent hydraulic fluid outlet holes, located in the vicinity of its end carrying the appendix.
  • a spring permanently urges the slide to move in the opposite direction to that of the drilling fluid.
  • the free end of the appendage retains the ball in a first part of the aforementioned bore, located upstream of the second part thereof, at least until the time when the the free end of the appendix engages in the third part of the bore.
  • Figure 1 is a cross-sectional view of a device according to the invention designated as a whole by the reference sign 1 in which a ball 2, intended to close the upstream end 3 of a core barrel 4, in applying to the seat 5 provided for the ball 2 at said end 3.
  • the device 1 comprises a tubular element 6 in the bore of which is guided a slide 7 delivering passage to a drilling fluid under pressure (direction of arrow X).
  • the tubular element 6 has at its upstream end 8 a thread 9 into which is screwed a hollow rod 10 advantageously provided with a turbine 11 or a downhole motor and at its downstream end 12, a thread 13 on which is screwed into the core barrel 4.
  • the turbine 11 rotated during the passage of the drilling liquid in the direction of arrow X, rotates the device 1 as well as the core barrel 4.
  • the slide 7 consists of a sleeve 14 having, on the one hand, a throttle orifice 15 of the flow of drilling liquid in the vicinity of its upstream end 16 and, on the other hand, a series of holes divergent 17 of the drilling liquid outlet located in the vicinity of its downstream end 18 carrying an appendage 19.
  • the sleeve 14 ends, upstream of the throttling orifice 15 of the drilling liquid flow, by a d-shaped piece funnel 20 intended to guide the flow of liquid towards the throttling orifice 15.
  • the sleeve 14 has an annular stop 21 on its outer face 22 in the vicinity of its upstream end 16, this stop 21 retaining in place a flange 23 d '' a socket 24.
  • the appendix 19 provided in the vicinity of the downstream end 18 of the sleeve 14 consists of a cylindrical rod 25 carrying at its free end 26 adjacent to the core barrel 4 a protrusion at the head 27, the latter having the shape of a cylinder 28 provided at each of its ends with a frustoconical outlet 29, 30.
  • the sleeve 14 forming a slide has, in the vicinity of the funnel-shaped part 20, a cylindrical external surface 31 adjacent to the internal surface 32 of the tubular element 6, this surface 31 having an annular groove 33 in which a gasket is placed. sealing 34.
  • the tubular element 6 has a passage 35 consisting of upstream to downstream of a cylindrical part 36 which is in contact with the cylindrical outer surface 31 having a diameter less than that of this part 36, so as to form a annular rim 38 on which bears a flange 39 provided with a rim 40, a bore 41 and finally, at its downstream end, a last cylindrical part 42 having a diameter greater than the diameter of the ball 2.
  • the bore 41 consists of the coaxial cylindrical parts 44, 45, 46 connected together as well as with the cylindrical parts 42 and 37 by frustoconical parts 47, 48, 49, 50.
  • the central cylindrical part 45 of the bore 41 has a diameter greater than that of the protuberance or head 27 of the appendage 19 increased by twice the diameter of the ball 2, while the cylindrical part 46 of this bore 41 has a diameter less than the diameter of the protrusion or head 27 increased by twice the diameter of the ball 2, so that the head 27 allows, when it is engaged in the cylindrical part 46, the ball 2 to be retained in the central cylindrical part 45, while it allows, when it is extracted from this cylindrical part 46, the ball 2 to pass from the central cylindrical part 45 in the cylindrical part 46 and to be applied on the seat 5 of the core barrel 4 (see Figures 3 and 4).
  • the cylindrical part 44 located upstream of the central cylindrical part 45 of the bore 41 has a diameter less than the diameter of the protuberance or head 27 increased by twice the diameter of the ball 2 but greater than the diameter of the rod 25 increased by twice the diameter of the ball 2, so that a ball 2 introduced into the upstream cylindrical part 44 through a hole 51 provided with a removable plug 52 remains in this part 44 at least until the head 27 engages in the cylindrical part 46 of bore 41 (see Figures 2 and 3).
  • the downstream end 53 of the turbine 11 serves as a retainer for the slide 7.
  • the core barrel 4 can consist of an outer tube 54 provided with a drill bit 55, in which is housed a hollow rod 56 having at its upstream part 55 the seat 5 for the ball 2.
  • a ball is introduced through the hole 51 in the upstream cylindrical part 44 of the bore 41, before starting the drilling operation, that is to say before introducing the drill string and the core barrel in the wellbore.
  • the descent of the drill string causes scree in the wellbore.
  • the drilling liquid Before taking a borehole, the drilling liquid must be passed (direction of arrow X) through the corer in order to clear and remove the scree that accumulated at the bottom of the borehole during the descent and ascent of the hollow drill string. Indeed, a core representative of the geological layer to be analyzed can only be taken when this operation to clear the scree has taken place.
  • the drilling liquid flow rate is advantageously adjusted to 1900 liters per minute.
  • the rinsing is then carried out effectively and the pressure drop created in the throttle orifice 15 and which reaches approximately 1 bar is slightly too small to push back the slide subjected to the antagonistic action of the coil spring 43.
  • Such a water hammer is particularly harmful in a core sampling tube because an abrupt deviation in the flow of drilling fluid results in the simultaneous creation of a depression inside the core barrel and an overpressure outside the core barrel.
  • the coring operation can take place.
  • a flow of drilling liquid of approximately 1100 liters per minute may be necessary to rotate, thanks to the turbine 11, the core barrel 4 as well as the device according to the invention 1.
  • the drilling fluid is guided by the divergent orifices 57 towards the annular space 58 of the core barrel 4, so as not to damage the sampled core.
  • Such a flow of 1100 liters per minute creates a pressure drop of approximately 0.5 bar in the throttle orifice 15 of the slide 7.
  • the device according to the invention, the core barrel, the turbine and the hollow drill rods are advantageously made of steel, while the crown of drilling advantageously contains particles of abrasive materials such as diamond, corundum, tungsten carbide or silicon possibly agglomerated in the form of platelets.
  • abrasive materials such as diamond, corundum, tungsten carbide or silicon possibly agglomerated in the form of platelets.

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  • 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)

Claims (14)

1. Vorrichtung zum Verschließen eines oberen Endes eines in einer Erdbohr-Ausrüstung für Bergbau oder Ölförderung montierten Kernbohrerrohres (4), umfassend ein Rohrelement (6) ähnlich denen, die den Rohrstrang bilden, sowie eine Gleit- bzw. Führungsbacke (7), die einer Bohrflüssigkeit unter Druck Durchlaß durch eine Drosselöffnung (15) gewährt und einen Schaft (25) und einen entlang eines Innenprofils eines Abschnitts (44) des Rohres (6) geführten, nach außen vorspringenden Kopf (27) umfaßt, wobei diese Führungsbacke (7) angetrieben bzw. in Bewegung gesetzt wird, um unter der Wirkung einer Erhöhung des Drucks der Bohrflüssigkeit eine erste Verschiebung zwischen einer Ausgangsposition und einer stabilen entfernten Position zu bewirken, dadurch gekennzeichnet, daß der Kopf (27) der Führungsbacke (7) mit dem Innenprofil eines ersten Abschnitts (44) des Rohres (6) so zusammenarbeitet, daß eine von einem am oberen Ende (3) des Kernbohrers (4) vorgesehenen Sitz (5) entfernte Verschlußkugel (2) in einer stabilen entfernten Position gehalten wird und daß es dieser Verschlußkugel (2) ermöglicht wird, sich auf obengenanntem Sitz (5) festzusetzen, wenn die Führungsbacke (7) unter der Wirkung einer nachfolgenden Verringerung des Drucks zu ihrer Ausgangsposition zurückgeführt wird.
2. Vorrichtung nach den Ansprüchen 1 und 3, dadurch gekennzeichnet, daß die Führungsbacke (7) an einem Ende mit einem zum obengenannten Ende (3) des Kernbohrers (4) gerichteten Verlängerungs- bzw. Ansatzstück (19) versehen ist, wobei dieses Ansatzstück (19) mit einem nach außen vorspringenden Kopf (27) versehen ist, der eine solche Form hat, daß das Ansatzstück (19) in der Ausgangsbohrposition der Führungsbacke (7) die Kugel (2) in einem ersten Abschnitt (44) der Bohrung (41) des Rohrelements (6) hält, während in der stabilen entfernten Position der nach außen vorspringende Kopf (27) die Kugel (2) in einem zweiten Abschnitt (45) der Bohrung (41) des Rohrelements (6) hält und das Absackenlassen der Kugel (2) hin zum Sitz (5) des Kernbohrers (4) ermöglicht, wenn die Führungsbacke (7) erneut ihre Ausgangsposition einnimmt.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das obengenannte Ansatzstück (19) der Führungsbacke (7) ein koaxiales zylindrisches freies Ende (26) in der Bohrung (41) des Ronrelements (6) zeigt bzw. aufweist und dadurch, daß diese Bohrung (41) aus aufeinanderfolgenden koaxialen zylindrischen Abschnitten (44, 45, 46) besteht, wobei ein erster (44), stromauf angeordneter von diesen Abschnitten einen Durchmesser aufweist, der im wesentlichen dem Durchmesser des Ansatzstückes (19), vergrößert um das Zweifache des Durchmessers der Kugel (2), entspricht, und ein zweiter dieser Abschnitte (45) einen Durchmesser aufweist, der größer ist als der des freien Endes (26) der Protuberanz (27), vergrößert um zumindest das Zweifache des Durchmessers der Kugel (2), während ein dritter Abschnitt (46) der Bohrung (41), welcher dem zweiten Abschnitt (45) von ebendieser benachbart ist und stromabwärts der Seite des obengenannten Endes (3) des Kernbohrers (4) liegt, einen geringeren Durchmesser hat als der Durchmesser des obengenannten freien Endes (26) des Ansatzstückes (19), vergrößert um das Zweifache des Durchmessers der Kugel (2).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Führungsbacke (7) eine obere stabile Ruhelage einnimmt, in der der obere Rand (29) einer in den zweiten Abschnitt (45) der Bohrung (41) eingreifenden Protuberanz (27) des Ansatzstücks (19) das Halten der Kugel (2) im ersten Abschnitt (44) der Bohrung (41) ermöglicht.
5. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Führungsbacke eine stabile untere Position einnimmt, in der die Protuberanz (26) des Ansatzstücks (19) in den dritten Abschnitt (46) dieser Bohrung (41) eingreift, durch Verschieben nach unten, wenn der durch das Ablaufen der Flüssigkeit in der Drosselung (15) verursachte Druckabfall höher ist als der Druck einer Feder (43).
6. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Führungsbacke (7) aus einer Muffe (14) besteht, die einerseits eine Drosselöffnung (15) für den Fluß der Bohrflüssigkeit in der Nachbarschaft ihres Endes (16) gegenüber demjenigen (18), welches das Ansatzstück (19) trägt, zeigt bzw. aufweist, und andererseits eine Reihe von divergierenden Auslaßöffnungen (17) der hydraulischen Flüssigkeit, die in Nachbarschaft ihres das Ansatzstück (19) tragenden Endes (18) liegen.
7. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Feder (43) die Führungsbacke (7) städig so beansprucht, daß sie sich in entgegengesetzer Richtung zur Bohrflüssigkeit verschiebt.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Feder eine Sprungfeder (49) ist, die entlang einer Randleiste (41) eines Bügels (39) gelagert ist, der auf die ringförmige Randleiste (38) des obengenannten röhrenförmigen Elements (6) gestützt ist.
9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das freie Ende (29) des Ansatzstücks (19) die Kugel (2) in einem ersten Abschnitt (44) der obengenannten Bohrung hält, der stromauf des zweiten Abschnitts (45) von ebendiesem liegt, zumindest bis zu dem Moment, wo das freie Ende (29) des Ansatzstücks (19) in den dritten Abschnitt (46) der Bohrung (41) eingreift.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß das röhrenförmige Element (6) eine mit einem herausziehbaren Stöpsel (52) ausgestattete Öffnung (51) aufweist, die es erlaubt, die Kugel (2) in den ersten Abschnitt (44) der genannten Bohrung (41) einzubringen.
11. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Element des Rohres (6) mit Mitteln (13) ausgerüstet ist, die es ermöglichen, es mit dem Kernbohrer (4) fest zu verbinden, sowie mit Mitteln (9), die es ermöglichen, es mit einem drehbaren Rohr (10) der Erdbohrungsausrüstung fest zu verbinden.
12. Ausrüstung, die aus einem fest bzw. formschlüssig mit einer Vorrichtung (1) nach einem der vorangehenden Ansprüche verbundenen Kernbohrer (4) gebildet wird.
13. Ausrüstung nach Anspruch 12, dadurch gekennzeichnet, daß sie ebenfalls zumindest ein drehbares Rohr (10) einer fest bzw. formschlüssig mit genannter Vorrichtung (1) verbundenen Erdbohr-Ausrüstung umfaßt.
14. Ausrüstung nach Anspruch 13, dadurch gekennzeichnet, daß eine Turbine (11) in einem drehbaren Rohr (10) der Erdbohr-Ausrüstung montiert ist.
EP88870060A 1987-04-14 1988-04-13 Vorrichtung zum Verschliessen eines Kernbohrgerätes in einem Bohrstrang Expired - Lifetime EP0287548B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8700395 1987-04-14
BE8700395A BE1000474A3 (fr) 1987-04-14 1987-04-14 Dispositif pour obturer un carottier monte dans un equipement de sondage.

Publications (2)

Publication Number Publication Date
EP0287548A1 EP0287548A1 (de) 1988-10-19
EP0287548B1 true EP0287548B1 (de) 1991-09-25

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ID=3882613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88870060A Expired - Lifetime EP0287548B1 (de) 1987-04-14 1988-04-13 Vorrichtung zum Verschliessen eines Kernbohrgerätes in einem Bohrstrang

Country Status (5)

Country Link
US (1) US4887676A (de)
EP (1) EP0287548B1 (de)
BE (1) BE1000474A3 (de)
DE (1) DE3865064D1 (de)
NO (1) NO881603L (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004330A3 (fr) * 1990-05-31 1992-11-03 Diamant Boart Stratabit Sa Carottier double pour forage devie.
EP0588373A1 (de) * 1990-05-31 1994-03-23 Diamant Boart Stratabit S.A. Doppelkernrohr für abgelenkte Bohrungen
US6009960A (en) * 1998-01-27 2000-01-04 Diamond Products International, Inc. Coring tool
US7100700B2 (en) * 2002-09-24 2006-09-05 Baker Hughes Incorporated Downhole ball dropping apparatus
GB2526826B (en) 2014-06-03 2016-05-18 Nov Downhole Eurasia Ltd Downhole actuation apparatus and associated methods
US10577879B2 (en) * 2017-11-27 2020-03-03 Chevron U.S.A. Inc. Subterranean coring assemblies

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1011823B (de) * 1954-11-17 1957-07-11 Helmut Huegel Dr Ing Einrichtung bei Kernbohrern
US3332497A (en) * 1964-11-12 1967-07-25 Jr John S Page Tubing and annulus pressure responsive and retrievable valve
US3850194A (en) * 1973-01-09 1974-11-26 Brown Oil Tools Check valve assembly
US4300643A (en) * 1979-03-22 1981-11-17 Diamant Boart Double core barrel
DE2919007C2 (de) * 1979-05-11 1982-07-22 Christensen, Inc., 84115 Salt Lake City, Utah Kernbohreinrichtung für Gesteinsbohrlöcher
US4453599A (en) * 1982-05-10 1984-06-12 Otis Engineering Corporation Method and apparatus for controlling a well
US4519457A (en) * 1984-02-16 1985-05-28 Armco Inc. Oil well standing valve

Also Published As

Publication number Publication date
NO881603L (no) 1988-10-17
NO881603D0 (no) 1988-04-13
DE3865064D1 (de) 1991-10-31
BE1000474A3 (fr) 1988-12-20
EP0287548A1 (de) 1988-10-19
US4887676A (en) 1989-12-19

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