(19)
(11)EP 1 212 512 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
16.01.2008 Bulletin 2008/03

(21)Application number: 00957211.6

(22)Date of filing:  24.08.2000
(51)Int. Cl.: 
E21B 25/00  (2006.01)
(86)International application number:
PCT/SE2000/001630
(87)International publication number:
WO 2001/014689 (01.03.2001 Gazette  2001/09)

(54)

A LOCKING DEVICE FOR A WIRE LINE CORE DRILLING SYSTEM, A WIRE LINE SYSTEM INCLUDING SAID DEVICE AND A METHOD FOR CORE DRILLING

VERRIEGELUNGSVORRICHTUNG FÜR KERNBOHRSYSTEME AM SEIL, SEILVORRICHTUNG MIT VERRIEGELUNG UND VERFAHREN ZUM KERNBOHREN

DISPOSITIF DE VERROUILLAGE DESTINE A DES SYSTEME DE FORAGE-CAROTTAGE A CABLE METALLIQUE, SYSTEME A CABLE METALLIQUE COMPRENANT CE DISPOSITIF ET PROCEDE DE FORAGE-CAROTTAGE


(84)Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30)Priority: 24.08.1999 SE 9903018

(43)Date of publication of application:
12.06.2002 Bulletin 2002/24

(73)Proprietor: ATLAS COPCO CRAELIUS AB
195 82 Märsta (SE)

(72)Inventor:
  • BORG, Thomas
    S-182 75 Stocksund (SE)

(74)Representative: Karlsson, Leif Karl Gunnar et al
L.A. Groth & Co. KB, Box 6107
102 32 Stockholm
102 32 Stockholm (SE)


(56)References cited: : 
GB-A- 992 246
US-A- 3 777 826
US-A- 3 701 389
US-A- 5 799 742
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to a locking device for a wire line core drilling system in accordance with the preamble to claim 1, a wire line core drilling system including a locking device in accordance with the preamble to claim 9, and a method of wire line core drilling in accordance with the preamble to claim 10.

    [0002] When performing exploratory drilling to collect rock samples from depths of from several hundred to a couple of thousand meters, double core tubes are used having an inner and an outer tube. The sample is collected in the inner tube, which usually has a length of a few meters. When the inner tube is full this is usually detected by means of a manometer or the like that measures the flushing water pressure in the core tube. A retriever device suspended on a wire is lowered into the tube for retracting the inner tube with the sample, said retriever device comprising a gripping means in the form of a claw or "spear head" arranged to engage with a gripping means arranged on/in the upper end of the inner tube. When the wire is then tautened the inner tube is disengaged from the outer tube, and the inner tube with the sample can be hoisted up. Conversely, the claw and gripping means on the inner tube can be used to lower a new inner tube. Equipment of this type is generally known as a wire line system.

    [0003] When a new inner tube is inserted it is important to be able to ascertain that the inner tube really has reached right down to the bottom and has assumed its correct position for drilling, before drilling is commenced. Ascertainment that the tube cannot no longer move, but is firmly held is generally taken as an indication that the inner tube has reached its correct position. According to known technology, therefore, the gripping means is often designed to be combined with some type of locking member that firmly locks the inner tube in relation to the outer tube when the inner tube has reached the correct position. This locking member usually consists of a hook-like device, preferably spring-loaded, a locking claw or latch that engages with recesses or shoulders arranged in the inside of the outer tube. Actual insertion of the inner tube is usually performed by the inner tube being "pumped" along inside the drill string with the aid of water, and/or lowered with the aid of the force of gravity, In the case or horizontal, or substantially horizontal holes the tube must be pumped along. When the inner tube is firmly in place the water pressure will increase to such an extent that a valve arranged for flushing medium in the inner tube is released.

    [0004] One problem with such known arrangements is that when the inner tube is inserted into the drill string, it sometimes catches before it has reached the correct position for drilling, With designs currently in use the increase in water pressure then occurring will release the flushing valve before the inner tube has reached its correct position and, in the worst case, drilling will be commenced. This primarily entails a disadvantage from the financial point of view since the drilling will be into thin air. The same thing may naturally occur when a tube that has been lowered by the force of gravity gets caught and drilling is commenced since it is assumed that the inner tube has reached the correct position for drilling. There is also a risk of the core at the bottom being destroyed.

    [0005] When the inner tube is full and shall be retracted the locking means in the form of locking claws or latches retaining the inner tube in the outer tube must be disengaged from the outer tube. This is usually achieved by the retractor claw engaging with the gripping means connected to the locking device, the latches of which then being drawn in against the action of the spring force that is pressing them outwards to achieve locking against the outer tube. A certain reaction force is thus necessary in the system in order to overcome the spring force, which also increases the friction at the point where the latches hook into the outer tube. Currently the most usual known device for achieving this comprises a sleeve that contributes to compressing the latches from below so that they are released from the recesses, shoulders, or the like of the outer tube. Other devices used to achieve this are described, for instance, in US patent specification 4,834,198 and Swedish patent No. 320 941. The latter particularly reveals the drawback that gripping means and locking member are only engaged at one point, which naturally easily leads to load imbalances and problems associated therewith. Due to the design of the known devices, as the placing of the springs and the various gripping and locking members, however, the problem sometimes arises that the locking member is not released from its engagement with the outer tube, remaining caught there and preventing the inner tube from being retracted with the core sample. This may result in extensive standstill costs, as well as other costs. In fact, the complete drill string must then be taken up and the wire must be cut in every joint of the drill string. This is extremely time-consuming and expensive.

    [0006] The US Patent No. 3,701,389 shows a wireline core drilling device with latch dogs which are used to lock the inner tube relative the outer tube by arms which interact with shoulders in the outer tube, and also arms which cooperate with the insertion tool. When the inner tube is in position, the latch dogs must make a first movement, swinging arms outwards, to release from the insertion tool, and when that insertion tool is removed, the arms will swing in opposite direction so that the heels and notches engage with the shoulders in the outer tube. There are thus two consecutive movements which releases an additional device, and locks the inner tube in position.

    [0007] The primary object of the present invention is to remedy the problems described above by means of a single device.

    [0008] The object of the invention is achieved by means of a locking device as defined in the characterizing part of claim 1, a wire line core drilling system as described in the characterizing part of claim 9, and a method as described in the characterizing part of claim 10.

    [0009] In accordance with the present invention, thus, a locking device for an inner tube comprises locking members so designed that, when the inner tube has been inserted into the outer tube and has assumed the correct position inside the outer tube for drilling, in one and the same movement it simultaneously effects mechanical locking of the inner tube in relation to the outer tube and mechanical release of a gripping means of an accompanying device connected to the inner tube. The invention thus offers the advantages that the accompanying device is not released until the inner tube has assumed the correct position inside the outer tube for drilling. This is particularly advantageous if, for instance, the accompanying device comprises a valve for flushing medium, which is usual as described above. When the valve is released, this is achieved mechanically with the aid of the locking device in accordance with the invention. Thus, it is not released as a result of any pressure increase, and the risks entailed with previously known pressure-released arrangements, e.g. that the valve is released when the tube catches, are therefore eliminated. The locking device in accordance with the invention also has the advantage that it can be used together with an accompanying device consisting of an insertion device for inserting an inner tube into an outer tube in a dry drill hole. A corresponding method is defined in claim 10.

    [0010] Preferably, the locking device in accordance with the invention also comprises gripping means which, when the inner tube is to be withdrawn from the outer tube with the aid of a retriever device comprising gripping means, and said gripping means of the retriever device come into contact with the gripping means of the locking device, in one and the same movement engage with the gripping means of the retriever device and simultaneously release the inner tube from its locked position in relation to the outer tube. The invention thus reveals the additional advantage that the locking device and catch are disengaged from each other at the same time as the inner tube is released from being locked in relation to the outer tube,

    [0011] The present invention thus offers the important advantage of being able to fulfil both the functions described, and also of being able to be used both together with a flushing valve and in a dry drill hole. It constitutes a more reliable, simpler and more economic solution than has been available through known technology.

    [0012] In accordance with a particularly preferred embodiment the locking device comprises at least two parts, each of which is journalled pivotably in the inner tube in radial direction about a shaft situated between rear protrusions and forward protrusions on respective parts, It is these protrusions that act as means for firmly locking the inner tube in relation to the outer tube, engage with gripping means on the retriever device and also firmly lock or release the accompanying device. These protrusions and other components of the invention will be described in the following detailed description with reference to the drawings.

    [0013] The invention also relates to a wire line core drill system including such a locking device, as defined in claim 9.

    [0014] Additional features and advantages are revealed in the dependent claims.

    [0015] The invention will now be described in detail with reference to the accompanying drawings, illustrating a non-limiting embodiment of the invention by way of example, in which:
    Figure 1
    shows a longitudinal section through a drill string provided with a locking device in accordance with the present invention, upon insertion of an inner tube,
    Figure 2
    shows a longitudinal section through a drill string provided with a locking device in accordance with the present invention, where the inner tube has assumed its correct position for drilling, and the flushing valve has been released,
    Figure 3
    shows a longitudinal section through a drill string provided with a locking device in accordance with the present invention, and illustrates how a retriever device is inserted into the locking device, and
    Figure 4
    shows a longitudinal section through drill string provided with a locking device in accordance with the present invention, where the inner tube is inserted into a dry drill hole.


    [0016] The drill string in Figure 1 thus comprises an outer tube 1 connected to a drill bit, and an inner tube 2, by means of which core samples are collected. Drilling is performed towards the right in the drawing, this being designated the forward direction. A locking device 4 is arranged in the rear part of the inner tube. A valve 5 for flushing medium is also arranged in the rear part of the inner tube. This valve may preferably be of the type that is the subject of the applicant's own Swedish patent application, filed simultaneously with the present patent application. The flushing medium is generally water. When drilling in downward direction, the inner tube is usually inserted in the drill string by simply dropping it inside the drill string so that it falls by force of gravity until it reaches the correct position inside the outer tube for drilling. When this method cannot be used, e.g. when drilling substantially in horizontal direction or at various upward angles, the inner tube is pumped along inside the drill string with the aid of flushing medium, preferably water. Figure 1 illustrates the position when the inner tube has just reached the correct position for drilling but has not yet been locked in relation to the outer tube.

    [0017] In accordance with the embodiment illustrated by way of example, the locking device comprises two parts or halves, and each of these parts comprises two forward protrusions 7, preferably with hook-like shape, directed radially outwards, which are designed to engage with recesses 8 arranged on the inside of the outer tube. These forward protrusions 7 may be compared with the latches on previously known devices. The locking device is also provided with forward protrusions 9 directed radially inwards and designed to engage with a gripping means 10 connected to the movable part of the valve 5. The protrusions 9 may also be used to engage with a gripping means in an device for inserting an inner tube into a dry drill hole, as described below in conjunction with Figure 4. Finally the locking device is also provided with rear protrusions 11, preferably with hook-like shape, directed radially inwards. These protrusions 11 are designed to engage with gripping means of a retriever device, as will be described in detail below with reference to Figure 3.

    [0018] The two parts of the locking device are spring-loaded and pivotably journalled in the inner tube about shafts 12 situated between the rear protrusions and the forward protrusions. The locking device can thus pivot in substantially radial direction, against the action of two springs 13, preferably wire springs. Each part can therefore be compared to a two-pronged lever.

    [0019] When the inner tube with the locking device is inserted into the outer tube the forward, the outwardly directed protrusions 7 assume a retracted or compressed position and slide along the inside of the drill string. When the inner tube reaches the correct position inside the outer tube for drilling, as illustrated in Figure 1, the protrusions 7 will be opposite the recesses 8 arranged in the outer tube and, thanks to the springs 13, can spring out and into abutment with the outer tube. The inner tube will thus be firmly held in relation to the outer tube. This state, with rebounded springs, is illustrated in Figure 2. The recesses 8 in the outer tube are shaped with a shoulder or stop 14, against which the hook-shaped part of the protrusion can abut, thus preventing the inner tube from being withdrawn from the outer tube.

    [0020] When the protrusions 7 and the entire portion of the locking device in front of the shafts 12 is permitted to rebound, the protrusions 9 will also move radially outwards so that the gripping means 10 connected to the movable part of the valve is released, and the valve 5 is thus also released. The movable part of the valve will therefore move, so that the valve is opened and flushing medium can flow freely into the inner tube. This is clear from Figure 2.

    [0021] Figure 3 illustrates how the locking device 4 functions when the inner tube is to be withdrawn. A retriever device 20, provided at the front with a gripping means 21, a spearhead, is inserted into the drill string. The gripping means 21 of the retriever device is so designed that, when it reaches the rear end of the locking device 4, it penetrates between the rear protrusions 11, pushing them apart, i.e. forcing them radially outwards against the action of the springs 13. The forward, outwardly directed protrusions 7 are thus moved radially inwards and become disengaged from the recesses 8 in the outer tube. The inner tube is now freely movable in axial direction. The gripping means 21 is inserted between the hook-shaped protrusions 11, so far that it engages therewith by abutting the hooks and is locked thereby. The inner tube can thus be freely removed from the outer tube by pulling the retriever device out. The valve 5 remains open throughout the withdrawal process, which is an advantage from the pressure aspect.

    [0022] Finally, Figure 4 illustrates how the locking device 4 can also be used when inserting an inner tube into a dry drill hole, The forward, inwardly directed protrusions 9 which are used in Figures 1 and 2 to keep the gripping means 10 joined to the valve, are instead used here to grip around a gripping means 25 connected to a device 26 for insertion of an inner tube. Figure 4 illustrates how the inner tube is inserted, before it has reached the correct position for drilling, i.e. before the protrusions 7 have arrived opposite the recesses 8 in the outer tube. The front portion of the locking device, with protrusions 7 and 9 is thus in its retracted position. When the inner tube comes to the position where the protrusions 7 are opposite the recesses 8, the front portion of the locking device will rebound in the same way as illustrated in Figure 2, the protrusions 7 and 9 thus moving radially outwards. The gripping means 25 of the insertion device will thus be released and the insertion device can be withdrawn from the tube while the inner tube is kept in place in the outer tube, as described earlier.

    [0023] The present invention is naturally not limited to the embodiment illustrated. It may be varied in many feasible ways within the scope of the appended claims. The number of parts may be varied, for instance, as well as the number of protrusions. In the example illustrated, furthermore, the two parts are provided with individual springs and are thus completely independent of each other. However, this is not necessary for the inventive concept.


    Claims

    1. A locking device for a wire line core drill comprising an inner tube (2) by means of which core samples are collected, and an outer tube (1) connected to a drill bit, which locking device is applied in the rear end of the inner tube, characterized in that the locking device (4) comprises locking members (7, 9) so designed that, when the inner tube has been inserted into the outer tube and has assumed the correct position inside the outer tube for drilling, in one and the same movement it simultaneously effects mechanical locking of the inner tube (2) in relation to the outer tube (1) and mechanical release of a gripping means (10; 25) of an accompanying device (5; 26) connected to the inner tube.
     
    2. A locking device as claimed in claim 1, characterized in that the locking device also comprises gripping means (11) that when the inner tube (2) is to be retracted from the outer tube (1) with the aid of a retriever device (20) comprising gripping means (21), and said gripping means of the retriever device come into contact with the gripping means (11) of the locking device, in one and the same movement, shall engage with the gripping means (21) of the retriever device and simultaneously release the inner tube (2) from its locked position in relation to the outer tube (1).
     
    3. A locking device as claimed in claim 1 or claim 2, characterized in that said locking device comprises at least two forward protrusions (7) directed radially outwards and at least two forward protrusions (9) directed radially inwards, said forward outwardly directed protrusions (7) being intended to achieve locking of the inner tube (2) in relation to the outer tube (1) and said forward inwardly directed protrusions (9) being intended to firmly lock the gripping means (10; 25) of the accompanying device (5; 26) during insertion into the outer tube, and to release the gripping means (10; 25) of the accompanying device when the inner tube has assumed its correct position in the outer tube for drilling.
     
    4. A locking device as claimed in claim 3, characterized in that it comprises at least two parts, in that each of these parts comprises at least one of said protrusions (7, 9), and in that each of said parts is journalled pivotably in the inner tube (2) in radial direction about a shaft (12) situated between the gripping means (11) of the locking device and its forward protrusions (7, 9) so that the forward protrusions can pivot outwards in radial direction at the same time as the gripping means (11) of the locking device can pivot inwards, and vice versa, whereupon the forward outwardly directed protrusions (7) effect locking of the inner tube (2) in relation to the outer tube (1) by pivoting outwards through openings arranged in the inner tube and engage with recesses (8) arranged on the inside of the outer tube, at the same time as the forward inwardly directed protrusions (9) also pivot outwards and mechanically release the gripping means (10; 25) of the accompanying device (5: 26) when the inner tube has assumed the correct position in the outer tube for drilling.
     
    5. A locking device as claimed in claim 3 or claim 4, characterized in that to achieve retraction of the inner tube, the gripping means (21) of the retriever device (20) forces the gripping means (11) of the locking device to pivot outwards so that they engage with the gripping means of the retriever device, and the forward protrusions (7, 9) thus pivot inwards so that the forward protrusions (7) disengage with said recesses (8) in the outer tube and thus release the inner tube from its locked position in relation to the outer tube.
     
    6. A locking device as claimed in claim 5, characterized in that the gripping means of the locking device comprise at least two rear protrusions (11) directed radially inwards.
     
    7. A locking device as claimed in any one of claims 3-6, characterized in that said inner tube (2) of the wire line core drill is provided with a valve (5) for flushing medium, and in that said forward inwardly directed protrusions (9) are designed to mechanically retain and mechanically release a gripping means (10) connected to said valve, whereupon the valve is opened.
     
    8. A locking device as claimed in any one of claims 3-6, characterized in that said accompanying device is an insertion device (26) for inserting an inner tube (2) into an outer tube (1), which is provided with gripping means (25), and in that said forward inwardly directed protrusion (9) are designed, in their inwardly pivoted position and during insertion of the inner tube (2) into the outer tube (1), to be in engagement with the gripping means (25) of said insertion device, and assume their outwardly pivoted position when the inner tube has assumed the correct position inside the outer tube for drilling, whereupon the locking device is disengaged from the gripping means (25) of the insertion device, so that said means can be removed together with its insertion device.
     
    9. A wire line core drill system comprising an inner tube (2) by means of which core samples are collected, and an outer tube (1) connected to a drill bit, characterized in that it is provided with a locking device (4) as claimed in any one of claims 1-8.
     
    10. A method for wire line core drilling using a wire line core drill comprising an inner tube by means of which core samples are collected, and an outer tube connected to a drill bit, which inner tube is provided with a locking device to position the inner tube in the correct position in the outer tube for drilling, and to firmly lock the inner tube to the outer tube in said correct position by means of first locking members, characterized in that

    • the inner tube is inserted into the outer tube, whereupon said first locking members are in a retracted position and second locking members of the locking device mechanically lock a gripping means of an accompanying device connected to the inner tube during insertion, until the inner tube has assumed the correct position in the outer tube, and

    • when the inner tube has assumed the correct position inside the outer tube the locking device, in one and the same movement simultaneously effects mechanical locking of the inner tube to the outer tube and mechanical release of said gripping means of the accompanying device,


     


    Ansprüche

    1. Verriegelungsvorrichtung für einen Seilstrang-Kernbohrer, der eine innere Röhre (2), mittels derer Kernproben gesammelt werden, und eine äußere Röhre (1) aufweist, die mit einem Bohrwerkzeug verbunden ist, wobei die Verriegelungsvorrichtung am hinteren Ende der inneren Röhre angeordnet ist, dadurch gekennzeichnet, dass die Verriegelungsvorrichtung (4) Verriegelungselemente (7, 9) aufweist, die derart gestaltet sind, dass sie dann, wenn die innere Röhre eingesetzt worden ist und die korrekte Lage innerhalb der äußeren Röhre zum Bohren eingenommen hat, mit ein und derselben Bewegung gleichseitig das mechanische Verriegeln der inneren Röhre (2) in Bezug auf die äußere Röhre (1) und das mechanische Lösen von Greifmitteln (10; 25) einer Begleitvorrichtung (5; 26) bewirken, die mit der inneren Röhre verbunden ist.
     
    2. Verriegelungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Verriegelungsvorrichtung weiterhin Greifmittel (11) aufweist, die dann, wenn die innere Röhre (2) aus der äußeren Röhre (1) mit Hilfe einer Rückholvorrichtung (2) herausgezogen werden soll, die Greifmittel (21) aufweist, und die Greifmittel der Rückholvorrichtung in Kontakt mit den Greifmitteln (11) der Verriegelungsvorrichtung gelangen, in ein und derselben Bewegung mit den Greifmitteln (21) der Rückholvorrichtung in Eingriff gelangen und gleichzeitig die innere Röhre (2) aus ihrer verriegelten Position in Bezug auf die äußere Röhre (1) lösen.
     
    3. Verriegelungsvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Verriegelungsvorrichtung wenigstens zwei vordere Vorsprünge (7), die radial nach außen gerichtet sind, und wenigstens zwei vordere Vorsprünge (9) aufweist, die radial nach innen gerichtet sind, wobei die vorderen, nach außen gerichteten Vorsprünge (7) dazu gedacht sind, das Verriegeln der inneren Röhre (2) mit Bezug auf die äußere Röhre (1) zu erreichen und die vorderen, nach innen gerichteten Vorsprünge (9) dazu gedacht sind, die Greifmittel (10; 25) der Begleitvorrichtung (5; 26) während des Einfügens in die äußere Röhre fest zu verriegeln und die Greifmittel (10, 25) der Begleitvorrichtung zu lösen, wenn die innere Röhre zum Bohren ihre korrekte Position in der äußeren Röhre eingenommen hat.
     
    4. Verriegelungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass sie wenigstens zwei Teile aufweist, wobei jedes dieser Teile wenigstens einen der Vorsprünge (7, 9) aufweist und diese Teile in radialer Richtung in der inneren Röhre (2) schwenkbar um eine Welle (12) gelagert sind, die zwischen den Greifmitteln (11) der Verriegelungsvorrichtung und ihren vorderen Vorsprüngen (7, 9) angeordnet ist, so dass die vorderen Vorsprünge in radialer Richtung zu der gleichen Zeit nach außen schwenken können, wenn die Greifmittel (11) der Verriegelungsvorrichtung nach innen schwenken können, und umgekehrt, woraufhin die vorderen, nach außen gerichteten Vorsprünge (7) das Verriegeln der inneren Röhre (2) in Bezug auf die äußere Röhre (1) bewirken, indem sie nach außen durch Öffnungen schwenken, die in der inneren Röhre angeordnet sind, und in Vertiefungen (1) eingreifen, die auf der Innenseite der äußeren Röhre angeordnet sind, während zur gleichen Zeit die vorderen, nach innen gerichteten Vorsprünge (9) ebenfalls nach außen schwenken und die Greifmittel (10; 25) der Begleitvorrichtung (5; 26) mechanisch lösen, wenn die innere Röhre die korrekte Position zum Bohren in der äußeren Röhre eingenommen hat.
     
    5. Verriegelungsvorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass zum Bewirken des Zurückziehens der inneren Röhre die Greifmittel (21) der Rückholvorrichtung (2) die Greifmittel (11) der Verriegelungsvorrichtung dazu zwingen, nach außen zu verschwenken, so dass sie in Eingriff mit den Greifmitteln der Rückholvorrichtung gelangen, und die vorderen Vorsprünge (7, 9) folglich derart nach innen schwenken, dass die vorderen Vorsprünge (7) aus den Ausnehmungen (8) in der äußeren Röhre ausrücken und daher die innere Röhre aus ihrer verriegelten Stellung in Bezug auf die äußere Röhre lösen.
     
    6. Verriegelungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Greifmittel der Verriegelungsvorrichtung wenigstens zwei hintere Vorsprünge (11) aufweisen, die radial nach innen gerichtet sind.
     
    7. Verriegelungsvorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die innere Röhre (2) des Seilstrang-Kernbohrers mit einem Ventil (5) für ein Spülmedium versehen ist und die vorderen, nach innen weisenden Vorsprünge (9) derart gestaltet sind, dass sie mit dem Ventil verbundene Greifmittel (10) mechanisch halten und mechanisch lösen, woraufhin das Ventil geöffnet wird.
     
    8. Verriegelungsvorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die Begleitvorrichtung eine Einschubvorrichtung (26) zum Einfügen einer inneren Röhre (2) in eine äußere Röhre (1) ist, wobei die Vorrichtung mit Greifmitteln (25) versehen ist und die vorderen, nach innen weisenden Vorsprünge (9) so gestaltet sind, dass sie in ihrer nach innen verschwenkten Position und während des Einfügens der inneren Röhre (2) in die äußere Röhre (1) in Eingriff mit den Greifmitteln (25) der Einschubvorrichtung stehen und ihre nach außen verschwenkte Stellung einnehmen, wenn die innere Röhre die korrekte Position zum Bohren innerhalb der äußeren Röhre eingenommen hat, woraufhin die Verriegelungsvorrichtung von den Greifmitteln (25) der Einschubvorrichtung ausgerückt wird, so dass diese Mittel zusammen mit der Einschubvorrichtung entfernt werden können.
     
    9. Seilstrang-Kernbohrsystem, das eine innere Röhre (2), mittels derer Kernproben gesammelt werden, sowie eine äußere Röhre (1) aufweist, die mit einem Bohrwerkzeug verbunden ist, dadurch gekennzeichnet, dass sie mit einer Verriegelungsvorrichtung (4) nach einem der Ansprüche 1 bis 8 versehen ist.
     
    10. Verfahren zum Seilstrang-Kernbohren unter Verwendung eines Seilstrang-Kernbohrers, der eine innere Röhre, mittels derer Kernproben gesammelt werden, und eine äußere Röhre aufweist, die mit einem Bohrwerkzeug verbunden ist, wobei die innere Röhre mit einer Verriegelungsvorrichtung versehen ist, um die innere Röhre zum Bohren in der korrekten Position in der äußeren Röhre anzuordnen und die innere Röhre mit der äußeren Röhre in der korrekten Stellung mittels erster Verriegelungselemente fest zu verriegeln, dadurch gekennzeichnet, dass

    - die innere Röhre in die äußere Röhre eingefügt wird, woraufhin erste Verriegelungselemente sich in einer zurückgezogenen Position befinden und zweite Verriegelungselemente der Verriegelungsvorrichtung mechanisch Greifmittel einer verriegeln, die mit der inneren Röhre während des Einfügens verbunden ist, bis die innere Röhre die korrekte Position in der äußeren Röhre eingenommen hat, und

    - wenn die innere Röhre die korrekte Stellung innerhalb der äußeren Röhre eingenommen hat, bewirkt die Verriegelungsvorrichtung mit ein und derselben Bewegung gleichzeitig das mechanische Verriegeln der inneren Röhre zu der äußeren Röhre und das mechanische Lösen der Greifmittel der Begleitvorrichtung.


     


    Revendications

    1. Un dispositif de verrouillage pour un système de forage-carottage à câble métallique comprenant un tube intérieur (2) au moyen duquel des échantillons carottés sont collectés, et un tube extérieur (1) connecté à un trépan, lequel dispositif de verrouillage est appliqué dans l'extrémité arrière du tube intérieur, caractérisé en ce que le dispositif de verrouillage (4) comporte des organes de verrouillage (7, 9) conçus de sorte que, lorsque le tube intérieur a été inséré dans le tube extérieur et a assumé la position correcte à l'intérieur du tube extérieur pour le forage, en un et même mouvement il effectue simultanément un verrouillage mécanique du tube intérieur (2) par rapport au tube extérieur (1) et une libération mécanique du moyen de préhension (10; 25) d'un dispositif annexe (5; 26) connecté au tube intérieur.
     
    2. Un dispositif de verrouillage tel que revendiqué dans la revendication 1, caractérisé en ce que le dispositif de verrouillage comporte également un moyen de préhension (11) qui, lorsque le tube intérieur (2) doit être rétracté du tube extérieur (1) à l'aide d'un dispositif de repêchage (20) comportant un moyen de préhension (21), et ledit moyen de préhension du dispositif de repêchage entre en contact avec le moyen de préhension (11) du dispositif de verrouillage, en un et même mouvement, s'engagera avec le moyen de préhension (21) du dispositif de repêchage et libérera simultanément le tube intérieur (2) de sa position verrouillée par rapport au tube extérieur (1).
     
    3. Un dispositif de verrouillage tel que revendiqué dans la revendication 1 ou la revendication 2, caractérisé en ce que ledit dispositif de verrouillage comporte au moins deux protubérances avant (7) dirigées radialement vers l'extérieur et au moins deux protubérances avant (9) dirigées radialement vers l'intérieur, lesdites protubérances avant dirigées vers l'extérieur (7) étant prévues pour réaliser un verrouillage du tube intérieur (2) par rapport au tube extérieur (1) et lesdites protubérances avant dirigées vers l'intérieur (9) étant prévues pour verrouiller fermement le moyen de préhension (10; 25) du dispositif annexe (5; 26) lors de l'insertion dans le tube extérieur, et pour libérer le moyen de préhension (10; 25) du dispositif annexe lorsque le tube intérieur a assumé sa position correcte dans le tube extérieur pour le forage.
     
    4. Un dispositif de verrouillage tel que revendiqué dans la revendication 3, caractérisé en ce qu'il comporte au moins deux parties, en ce que chacune des ces parties comporte au moins une desdites protubérances (7, 9), et en ce que chacune desdites parties est tourillonnée de manière pivotante dans le tube intérieur (2) en direction radiale autour d'un arbre (12) situé entre le moyen de préhension (11) du dispositif de verrouillage et ses protubérances avant (7, 9) de sorte que les protubérances avant peuvent pivoter vers l'extérieur en direction radiale en même temps que le moyen de préhension (11) du dispositif de verrouillage peut pivoter vers l'intérieur, et vice versa, ce par quoi les protubérances avant dirigées vers l'extérieur (7) effectuent le verrouillage du tube intérieur (2) par rapport au tube extérieur (1) en pivotant vers l'extérieur à travers des ouvertures agencées dans le tube intérieur et s'engagent avec des encoches (8) agencées sur l'intérieur du tube extérieur, en même temps que les protubérances avant dirigées vers l'intérieur (9) pivotent également vers l'extérieur et libèrent mécaniquement le moyen de préhension (10; 25) du dispositif annexe (5; 26) lorsque le tube intérieur a assumé la position correcte dans le tube extérieur pour le forage.
     
    5. Un dispositif de verrouillage tel que revendiqué dans la revendication 3 ou la revendication 4, caractérisé en ce que pour réaliser une rétraction du tube intérieur, le moyen de préhension (21) du dispositif de repêchage (20) force le moyen de préhension (11) du dispositif de verrouillage à pivoter vers l'extérieur de sorte qu'ils s'engagent avec le moyen de préhension du dispositif de repêchage, et les protubérances avant (7, 9) pivotent ainsi vers l'intérieur de sorte que les protubérances avant (7) se dégagent desdites encoches (8) dans le tube extérieur et libèrent ainsi le tube intérieur de sa position verrouillée par rapport au tube extérieur.
     
    6. Un dispositif de verrouillage tel que revendiqué dans la revendication 5, caractérisé en ce que le moyen de préhension du dispositif de verrouillage comporte au moins deux protubérances arrière (11) dirigées radialement vers l'intérieur.
     
    7. Un dispositif de verrouillage tel que revendiqué dans l'une quelconque des revendications 3-6, caractérisé en ce que ledit tube intérieur (2) du carottier à câble métallique est pourvu d'une soupape (5) pour le milieu de rinçage, et en ce que lesdites protubérances avant dirigées vers l'intérieur (9) sont conçues pour retenir mécaniquement et libérer mécaniquement un moyen de préhension (10) connecté à ladite soupape, ce par quoi la soupape est ouverte.
     
    8. Un dispositif de verrouillage tel que revendiqué dans l'une quelconque des revendications 3-6, caractérisé en ce que ledit dispositif annexe est un dispositif d'insertion (26) pour l'insertion d'un tube intérieur (2) dans un tube extérieur (1), lequel est pourvu d'un moyen de préhension (25), et en ce que lesdites protubérances avant dirigées vers l'intérieur (9) sont conçues, en leur position pivotée vers l'intérieur et lors de l'insertion du tube intérieur (2) dans le tube extérieur (1), pour être en engagement avec le moyen de préhension (25) dudit dispositif d'insertion, et pour assumer leur position pivotée vers l'extérieur lorsque le tube intérieur a assumé la position correcte à l'intérieur du tube extérieur pour le forage, ce par quoi le dispositif de verrouillage est dégagé du moyen de préhension (25) du dispositif d'insertion, de sorte que ledit moyen peut être retiré de pair avec son dispositif d'insertion.
     
    9. Un procédé de forage-carottage à câble métallique comportant un tube intérieur (2) au moyen duquel des échantillons carottés sont collectés, et un tube extérieur (1) connecté à un trépan, caractérisé en ce qu'il est pourvu d'un dispositif de verrouillage (4) tel que revendiqué dans l'une quelconque des revendications 1-8.
     
    10. Un procédé de forage-carottage à câble métallique utilisant un carottier à câble métallique comportant un tube intérieur au moyen duquel des échantillons carottés sont collectés, et un tube extérieur connecté à un trépan, lequel tube intérieur est pourvu d'un dispositif de verrouillage pour positionner le tube intérieur dans la position correcte dans le tube extérieur pour le forage, et pour verrouiller fermement le tube intérieur au tube extérieur dans ladite position correcte au moyen de premiers organes de verrouillage, caractérisé en ce que

    • le tube intérieur est inséré dans le tube extérieur, ce par quoi lesdits premiers organes de verrouillage sont en position rétractée et les deuxièmes organes de verrouillage du dispositif de verrouillage verrouillent mécaniquement un moyen de préhension d'un dispositif annexe connecté au tube intérieur lors de l'insertion, jusqu'à ce que le tube intérieur ait assumé la position correcte dans le tube extérieur, et

    • lorsque le tube intérieur a assumé la position correcte à l'intérieur du tube extérieur, le dispositif de verrouillage, en un et même mouvement effectue simultanément un verrouillage mécanique du tube intérieur au tube extérieur et une libération mécanique dudit moyen de préhension du dispositif annexe.


     




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    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description