EP0376044B1 - Core-drilling tool - Google Patents
Core-drilling tool Download PDFInfo
- Publication number
- EP0376044B1 EP0376044B1 EP89122882A EP89122882A EP0376044B1 EP 0376044 B1 EP0376044 B1 EP 0376044B1 EP 89122882 A EP89122882 A EP 89122882A EP 89122882 A EP89122882 A EP 89122882A EP 0376044 B1 EP0376044 B1 EP 0376044B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- locking
- drilling tool
- core drilling
- tube part
- positioning tube
- 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
Links
- 238000005553 drilling Methods 0.000 title claims description 33
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 241000282472 Canis lupus familiaris Species 0.000 claims 3
- 239000000470 constituent Substances 0.000 claims 1
- 210000000078 claw Anatomy 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
Images
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
Definitions
- the invention relates to a core drilling tool according to the preamble of claim 1.
- the conical adjusting thread of the adjusting device also forms the connecting thread for supporting the internal unit in the outer housing.
- a tubular extension of the indoor unit is provided with axial locking grooves on its outside, into which locking claws projecting inwards from above by a cylindrical locking element can be inserted, which at the same time project over the lower edge of the locking part and into slots in a lower shoulder of an expanded inner bore of the outer housing can be used.
- the outer housing is screwed on at a separation point located close above the adjusting device, after which the inner unit can be rotated and axially adjusted with the aid of a key inserted into the lower tool part from above and can be brought into engagement with the inner unit and after the lock has been released. Adjustment movements require a high torque on the key in this version, because the full weight of the inner element rests on the flat threads of the adjusting thread.
- the setting device is arranged in a concealed manner during setting operations and cannot be checked visually, also for functionality.
- the design of the adjusting device as a separate intermediate unit creates an adjustment possibility which is independent of the suspension of the inner unit in the outer housing and which can also be subsequently implemented with core drilling tools of any design.
- the upper outer housing part together with the inner unit can be pulled open a bit, thereby exposing the inner part of the intermediate unit for an optical inspection during the setting process and intercepting it below the adjusting thread for the purpose of weight relief.
- settings can be made precisely and over a large travel range with little effort, which is particularly important in the case of very long inner tubes and / or those made of special materials such as plastic or aluminum.
- the adjusting device can be individually adapted to the core drilling tool in which it is used and is in this adaptation independent of other functions such as the support in the outer housing.
- the intermediate unit can be used at any suitable position between the connection point of the inner unit and the bearing device for the inner tube, so that the application of the invention is not restricted to special designs of core drilling tools, but is possible with all core drilling tools that have an outer housing and an in supported indoor unit.
- the tubular outer casing 2 is provided at its lower end with a core bit 5, e.g. screwed.
- an inner unit designated as a whole as 6, which is supported at its upper end at a connection point 7 in the outer housing, for example by being screwed to it.
- the internal unit 6 can be pulled up as a whole and a suitable support is provided.
- the inner unit 6 comprises, as the lower component, an inner tube 8 receiving a drilled core, which is mounted freely rotatable about its central axis and thus the main tool axis 10 by means of a bearing device 9 relative to the upper component of the inner unit 6.
- a bearing device 9 relative to the upper component of the inner unit 6.
- an adjusting device 11 which is illustrated schematically in more detail in FIGS. 2 and 3 and which is designed as a separate intermediate unit.
- the adjusting device 11 inserted into the core drilling tool 1 at a suitable point between the connection point 7 for the inner unit 6 and the bearing device 9 for the inner tube 8 comprises in particular an outer part 12 which can be inserted into the outer housing 2 and which is designed as a spacer tube and between the adjacent parts of the outer housing 2 is screwed in between, and an inner part 13.
- This has an upper adjusting tube part 14 with an external thread 15 along its lower main part and with an external thread 16 at its upper end and a lower adjusting tube part 17, which is provided with an internal thread 18 at least in its upper region .
- External threads 15 and internal threads 18 of the adjusting tube parts 14, 15 which are in screw engagement with one another form an adjusting thread which enables an axial adjustment of one adjusting tube part 14 relative to the other adjusting tube part 17.
- the upper control tube part 14 has, along its main part provided with an external thread 15, axial locking grooves 19 which intersect with the external thread 15, two of which are provided in a diametrical arrangement.
- the lower adjusting tube part 17 is also provided on the outside of its upper area with axial locking grooves 20, preferably with four locking grooves 20 arranged diametrically in pairs.
- a lock nut 21 On the upper control tube part 14 is along its external thread 15 a lock nut 21 is screwed on, and below the lock nut 21 there is a locking element 22, which is designed as an annular body, can be displaced along the external thread 15 of the upper adjusting tube part 14 and with inward, provided at the upper end locking claws 23 in the locking grooves 19 of the engages upper adjusting tube part 14.
- the locking element 22 engages with the locking grooves 20 of the lower actuating tube part 17 when changing into its locking position from above, so that in the locking position of the locking element 22 the upper and the lower actuating tube part 14, 17 against rotational movements are secured. In this locking position illustrated in FIG. 2, the locking element 22 is secured against an upward movement by the locking nut 21.
- Markings 25 can be provided in the locking grooves 19 of the upper adjusting tube part 14, which make it possible to control the extent of the adjustments provided by measuring the distance between the top of the locking nut 21 and the markings 25.
- a gap of the desired dimension e.g., between the lower end of the inner tube 8 and the core drill bit, of 4 mm, can be set or restored, which ensures the passage of drilling fluid.
- the outer housing 2 in the area below the upper end of the spacer tube 12, for example in the rotary table of a drilling tower, intercepted and its screw connection with the upper part of the outer housing 2 loosened. Then the upper part of the core drilling tool 1 together with the inner unit 6 is pulled up a little until the adjusting device 11 is exposed. In the area below the adjusting thread 15, 18, the internal unit 6 is then intercepted with respect to the fixed lower tool part, thereby relieving the weight of the adjusting thread 15, 18. Then the lock nut 21 is screwed up along the external thread 15 of the upper adjusting tube part 14, the locking element 22 is pushed up axially and brought out of locking engagement.
- the desired adjustment or adjustment is then carried out by screwing the upper adjusting tube part 14 with respect to the lower adjusting tube part 17. Subsequently, the locking element 22 is moved back into its locking position and the lock nut 21 is screwed down until the locking element 22 is firmly pressed against the upper end of the lower control tube part 17. After lowering the upper tool part, the outer housing 2 can then be screwed together again, after which the core drilling tool with an adjusted gap between the end of the core tube 8 and the core drilling bit 5 is ready for operation.
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- 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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
- Drilling And Boring (AREA)
Description
Die Erfindung bezieht sich auf ein Kernbohrwerkzeug gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a core drilling tool according to the preamble of
Bei einem bekannten Kernbohrwerkzeug dieser Art (US-A-4 300 643) bildet das konische Stellgewinde der Einstellvorrichtung zugleich das Anschlußgewinde für die Abstützung der Inneneinheit im Außengehäuse. In einem über das Stellgewinde nach oben vorstehenden Bereich ist ein rohrförmiger Ansatz der Inneneinheit mit axialen Riegelnuten an seiner Außenseite vergesehen, in die von oben einwärts von einem zylindrischen Riegelelement vorstehende Riegelklauen einführbar sind, die zugleich über den unteren Rand des Riegelteils vorspringen und in Schlitze in einer unteren Schulter einer erweiterten Innenbohrung des Außengehäuses einsetzbar sind. Zur Durchführung eines Verstellvorganges wird das Außengehäuse an einer nahe über der Einstellvorrichtung gelegenen Trennstelle aufgeschraubt, wonach mit Hilfe eines von oben in den unteren Werkzeugteil eingeführten und mit der Inneneinheit in Eingriff bringbaren Schlüssels und nach Aufheben der Verriegelung die Inneneinheit verdreht und axial verstellt werden kann. Verstellbewegungen erfordern bei dieser Ausführung ein hohes Drehmoment am Schlüssel, weil das vollständige Gewicht des Innenelements auf den flachen Gewindegängen des Stellgewindes ruht. Dies schließt eine Justierung von schweren Inneneinheiten, z.B. solchen mit langen Innenrohren, in der Praxis aus. Hinzu kommt, daß die Einstellvorrichtung bei Einstellvorgängen verdeckt angeordnet ist und sich einer optischen Kontrolle, auch auf Funktionsfähigkeit, entzieht. Dies gilt auch für ein weiterhin bekanntes Kernbohrwerkzeug (EP-A- 0 174 615), bei der das über die gemeinsame Stell- und Anschlußgewindeverbindung zwischen Innenelement und Außengehäuse vorstehende Ansatzteil des Innenelementes geschlitzt ist und dementsprechend Spreizzungen mit außen an diesen vorgesehenen Riegelklauen darbietet, die bei Einschrauben eines Spreizkörpers in Eingriff mit axialen Riegelnuten in der Innenseite des Außengehäuses gelangen.
Der Erfindung liegt die Aufgabe zugrunde, ein Kernbohrwerkzeug zu schaffen, das eine von einer Belastung durch das Gewicht der Inneneinheit zumindest weitgehend befreibare axiale Verstellung über einen langen Verstellweg ermöglicht. Die Erfindung löst diese Aufgabe durch ein Kernbohrwerkzeug mit den Merkmalen das Anspruchs 1. Hinsichtlich wesentlicher weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 9 verwiesen.In a known core drilling tool of this type (US-A-4 300 643), the conical adjusting thread of the adjusting device also forms the connecting thread for supporting the internal unit in the outer housing. In a region projecting upwards above the adjusting thread, a tubular extension of the indoor unit is provided with axial locking grooves on its outside, into which locking claws projecting inwards from above by a cylindrical locking element can be inserted, which at the same time project over the lower edge of the locking part and into slots in a lower shoulder of an expanded inner bore of the outer housing can be used. To carry out an adjustment process, the outer housing is screwed on at a separation point located close above the adjusting device, after which the inner unit can be rotated and axially adjusted with the aid of a key inserted into the lower tool part from above and can be brought into engagement with the inner unit and after the lock has been released. Adjustment movements require a high torque on the key in this version, because the full weight of the inner element rests on the flat threads of the adjusting thread. This includes adjusting heavy indoor units, such as those with long inner tubes practice. In addition, the setting device is arranged in a concealed manner during setting operations and cannot be checked visually, also for functionality. This also applies to a core drilling tool which is still known (EP-A-0 174 615), in which the projection part of the inner element projecting over the common adjusting and connecting thread connection between the inner element and the outer housing is slotted and accordingly there are spreading tongues with locking claws provided on the outside thereof when screwing in an expanding body, engage with axial locking grooves in the inside of the outer housing.
The invention has for its object to provide a core drilling tool that enables an axial adjustment over a long adjustment path that is at least largely releasable from a load due to the weight of the indoor unit. The invention solves this problem by means of a core drilling tool with the features of
Die Ausbildung der Einstellvorrichtung als gesonderte Zwischeneinheit schafft eine von der Aufhängung der Inneneinheit im Außengehäuse unabhängige Verstellmöglichkeit, die auch nachträglich bei Kernbohrwerkzeugen jedweder Ausbildung realisiert werden kann. Nach Trennen des Außengehäuses am oberen Ende des Außenteils der Zwischeneinheit kann der obere Außengehäuseteil mitsamt der Inneneinheit ein Stück aufgezogen und dadurch der Innenteil der Zwischeneinheit für eine optische Inspektion während des Einstellvorganges freigelegt und unterhalb des Stellgewindes zum Zwecke der Gewichtsentlastung abgefangen werden. Auf diese Weise können Einstellungen präzise und über einen großen Stellweg mit geringem Kraftaufwand vorgenommen werden, was insbesondere bei sehr langen Innenrohren und/oder solchen aus speziellen Materialien wie Kunststoff oder Aluminium von besonderer Bedeutung ist. Die Einstellvorrichtung kann infolge ihrer Ausbildung als gesonderte Zwischeneinheit individuell an das Kernbohrwerkzeug, in dem es Anwendung findet, angepaßt werden und ist in dieser Anpassung unabhängig von sonstigen Funktionen wie der Abstützung im Außengehäuse. Die Zwischeneinheit kann an jeder geeigneten Position zwischen der Anschlußstelle der Inneneinheit und der Lagervorrichtung für das Innenrohr eingesetzt werden, so daß die Anwendung der Erfingung nicht auf spezielle Bauformen von Kernbohrwerkzeugen beschränkt, sondern bei allen Kernbohrwerkzeugen möglich ist, die über ein Außengehäuse und über eine in diesem abgestützte Inneneinheit verfügen.The design of the adjusting device as a separate intermediate unit creates an adjustment possibility which is independent of the suspension of the inner unit in the outer housing and which can also be subsequently implemented with core drilling tools of any design. After separating the outer housing at the upper end of the outer part of the intermediate unit, the upper outer housing part together with the inner unit can be pulled open a bit, thereby exposing the inner part of the intermediate unit for an optical inspection during the setting process and intercepting it below the adjusting thread for the purpose of weight relief. In this way, settings can be made precisely and over a large travel range with little effort, which is particularly important in the case of very long inner tubes and / or those made of special materials such as plastic or aluminum. Due to its design as a separate intermediate unit, the adjusting device can be individually adapted to the core drilling tool in which it is used and is in this adaptation independent of other functions such as the support in the outer housing. The intermediate unit can be used at any suitable position between the connection point of the inner unit and the bearing device for the inner tube, so that the application of the invention is not restricted to special designs of core drilling tools, but is possible with all core drilling tools that have an outer housing and an in supported indoor unit.
Ein Ausführungsbeispiel des Gegenstands der Erfindung ist in der Zeichnung näher veranschaulicht. In der Zeichnung zeigen:
- Fig. 1
- eine abgebrochene Seitenansicht, teilweise im Schnitt, eines Kernbohrwerkzeugs nach der Erfindung,
- Fig. 2
- in einer Vergrößerung des Ausschnitts II in Fig. 1 einen Halbschnitt durch das Kernbohrwerkzeug in Höhe seiner Einstellvorrichtung, und
- Fig. 3
- einen Querschnitt nach der Linie III-III in Fig. 2.
- Fig. 1
- 3 shows a broken side view, partly in section, of a core drilling tool according to the invention,
- Fig. 2
- in an enlargement of section II in Fig. 1, a half section through the core drilling tool at the level of its adjusting device, and
- Fig. 3
- a cross section along the line III-III in Fig. 2nd
Das in der Zeichnung veranschaulichte Ausführungsbeispiel eines Kernbohrwerkzeugs 1 erfindungsgemäßer Ausbildung umfaßt im einzelnen ein üblicherweise aus mehreren untereinander verschraubten Segmenten zusammengesetztes Außengehäuse 2, das an seinem oberen Ende über Anschlußmittel 3, z.B. ein Schraubgewinde, mit einem Bohrrohrstrang 4 verbindbar ist. Das rohrförmige Außengehäuse 2 ist an seinem unteren Ende mit einer Kernbohrkrone 5 versehen, z.B. verschraubt.The embodiment of a
Im Inneren des Außengehäuses 2 ist eine als Ganzes mit 6 bezeichnete Inneneinheit untergebracht, die an ihrem oberen Ende an einer Anschlußstelle 7 im Außengehäuse abgestützt, z.B. durch Verschrauben mit diesem verbunden ist.In the interior of the
Im Falle der Ausbildung des Kernbohrwerkzeugs 1 als Seilkernbohwerkzeug ist die Inneneinheit 6 als Ganzes aufziehbar und eine dafür geeignete Abstützung vorgesehen.If the
Die Inneneinheit 6 umfaßt als unteren Bestandteil ein einen erbohrten Kern aufnehmendes Innenrohr 8, das mittels einer Lagervorrichtung 9 relativ zum oberen Bestandteil der Inneneinheit 6 frei drehbar um seine Mittelachse und damit die Werkzeughauptachse 10 gelagert ist. In dem in Fig. 1 mit II bezeichneten Ausschnitt des Kernbohrwerkzeugs 1 befindet sich eine in den Fig. 2 und 3 schematisch näher veranschaulichte Einstellvorrichtung 11, die als gesonderte Zwischeneinheit ausgebildet ist. Die an geeigneter Stelle zwischen der Anschlußstelle 7 für die Inneneinheit 6 und der Lagervorrichtung 9 für das Innenrohr 8 in das Kernbohrwerkzeug 1 eingefügte Einstellvorrichtung 11 umfaßt im einzelnen einen in das Außengehäuse 2 einsetzbaren Außenteil 12, der als Distanzrohr ausgebildet und zwischen die benachbarten Teile des Außengehäuses 2 zwischengeschraubt ist, sowie einen Innenteil 13. Dieser hat ein oberes Stellrohrteil 14 mit einen Außengewinde 15 entlang seines unteren Hauptteils und mit einem Außengewinde 16 an seinem oberen Ende sowie einen unteren Stellrohrteil 17, der mit einem Innengewinde 18 zumindest in seinem oberen Bereich versehen ist. Außengewinde 15 und Innengewinde 18 der miteinander in Schraubeingriff stehenden Stellrohrteile 14,15 bilden ein Stellgewinde, das eine axiale Schraubverstellung des einen Stellrohrteils 14 relativ zum anderen Stellrohrteil 17 ermöglicht.The
Der obere Stellrohrteil 14 weist entlang seinem mit Außengewinde 15 versehenen Haupteil axiale, sich mit dem Außengewinde 15 verschneidende Riegelnuten 19 auf, von denen zwei in diametraler Anordnung vorgesehen sind. Der untere Stellrohrteil 17 ist an der Außenseite seines oberen Bereiches ebenfalls mit axialen Riegelnuten 20 versehen, und zwar bevorzugt mit vier paarweise diametral angeordneten Riegelnuten 20.The upper
Auf dem oberen Stellrohrteil 14 ist entlang dessen Außengewinde 15 eine Sicherungsmutter 21 verschraubbar angebracht, und unterhalb der Sicherungsmutter 21 befindet sich ein Verriegelungselement 22, das als Ringkörper ausgebildet ist, entlang dem Außengewinde 15 des oberen Stellrohrteils 14 verschiebbar ist und mit einwärts gerichteten, am oberen Ende vorgesehenen Riegelklauen 23 in die Riegelnuten 19 des oberen Verstellrohrteils 14 eingreift. Mit gesonderten, axial abwärts vorstehenden Riegelklauen 24 gelangt das Verriegelungselement 22 bei Übergang in seine Verriegelungsstellung von oben her in Eingriff mit den Riegelnuten 20 des unteren Stellrohrteils 17, so daß in der Verriegelungsstellung des Verriegelungselementes 22 das obere und das untere Stellrohrteil 14,17 gegen Verdrehbewegungen gesichert sind. In dieser in Fig. 2 veranschaulichten Riegelstellung ist das Verriegelungselement 22 durch die Sicherungsmutter 21 gegen eine Aufwärtsbewegung gesichert.On the upper
In den Riegelnuten 19 des oberen Stellrohrteils 14 können Markierungen 25 vorgesehen sein, die es ermöglichen, durch Messen des Abstandes zwischen der Oberseite der Sicherungsmutter 21 und den Markierungen 25 das Ausmaß vorgesehener Verstellungen zu kontrollieren.
Mit Hilfe von Verstellungvorgängen kann zwischen dem unteren Ende des Innenrohrs 8 und der Kernbohrkrone ein Spalt gewünschter Abmessung, z.B. von 4 mm, eingestellt oder wiederhergestellt werden, der den Durchtritt von Bohrspülung sichert.With the help of adjustment processes, a gap of the desired dimension, e.g., between the lower end of the
Am unteren Ende zumindest einer Riegelnut 19 des oberen Stellrohrteils 14 ist eine mit ihrem Kopf in der Riegelnut 19 versenkte angeordnete radiale Sicherungsschraube 26 vorgesehen, und im unteren Stellrohrteil 17 ist eine von einem versenkten Schraubstopfen 27 verschlossene Durchgangsöffnung vorgesehen, die einen Durchgang für eine Schraubwerkzeug zur Sicherungsschraube 26 ermöglicht.At the lower end of at least one
Zur Durchführung eines Einstellungsvorganges wird nach Bestimmung der bestehenden Spaltweite, z.B. durch direkte Messung, das Außengehäuse 2 im Bereich unterhalb des oberen Endes des Distanzrohres 12, z.B. im Drehtisch eines Bohrturms, abgefangen und dessen Schraubverbindung mit dem oberen Teil des Außengehäuses 2 gelöst. Danach wird der obere Teil des Kernbohrwerkzeuges 1 mitsamt der Inneneinheit 6 ein Stück aufgezogen bis die Einstellvorrichtung 11 freiliegt. Im Bereich unterhalb des Stellgewindes 15,18 wird danach die Inneneinheit 6 gegenüber dem festgelegten unteren Werkzeugteil abgefangen und dadurch das Stellgewinde 15,18 gewichtsentlastet. Alsdann wird die Sicherungsmutter 21 entlang dem Außengewinde 15 des oberen Stellrohrteils 14 hochgeschraubt, das Riegelelement 22 axial hochgeschoben und außer Riegeleingriff gebracht. Danach wird durch eine Schraubbewegung des oberen Stellrohrteils 14 gegenüber dem unteren Stellrohrteil 17 die gewünschte Ver- bzw. Einstellung vorgenommen. Anschließlich wird das Riegelelement 22 wieder in seine Verriegelungsstellung nach unten bewegt und die Sicherungsmutter 21 herabgeschraubt, bis ein fester Andruck des Riegelelementes 22 am oberen Ende des unteren Stellrohrteils 17 gegeben ist. Nach Absenken des oberen Werkzeugteils kann dann das Außengehäuse 2 wieder zusammengeschraubt werden, wonach das Kernbohrwerkzeug mit eingestelltem Spalt zwischen dem Ende der Kernrohrs 8 und der Kernbohrkrone 5 für den Betrieb bereit ist.To carry out an adjustment process after determining the existing gap width, for example by direct Measurement, the
Claims (9)
- A core drilling tool (1) with a tubular outer housing (2) adapted at its top end to be connected to a drill line (4) and which can at its bottom end be connected to a core drilling bit (5) and with, receiving the drilled-out core, an inner pipe (8) which forms the bottom constituent part of an inner unit (6) the upper part of which is supported against a connection point (7) in the outer housing (2) and which is, by means of a bearing device (9), mounted to rotate freely in relation to the upper part of the inner unit (6) and which can by means of an adjusting device (11) be adjusted axially in relation to the outer housing (2), the adjusting device (11) being axially adjustable in relation to the outer housing (2), the adjusting device (11) comprising a positioning screw thread (15, 18) and a locking element (22) with locking dogs (23, 24) which can engage locking grooves (19, 20), the adjusting device (11) forming a separate intermediate unit which comprises an outer part (12) inserted into the outer housing (2), characterised in that the adjusting device (11) is incorporated into the core drilling tool (1) in the area between the connection point (7) for the inner unit (6) and the bearing device (9) for the inner pipe (8) and comprises, inserted into the inner unit (6), an inner part (13) with a cylindrical positioning screw thread (15, 18) which, after separation of the connection between the outer part (12) and the part of the outer housing (2) which is above it, can be exposed and caught in the area below its positioning screw thread (15, 18).
- A core drilling tool according to claim 1, characterised in that the outer housing (2) is sub-divided at the level of the adjusting device (11) and in that the outer part (12) of the adjusting device (11) is constructed as a spacer tube which can be interposed into the outer housing (2) by being screwed.
- A core drilling tool according to claim 1 or 2, characterised in that the inner part (13) of the adjusting device (11) comprises an upper positioning tube part (14) with an external screw thread (15) and a lower positioning tube part (17) having an internal screw thread (18) and designed to be screwed into the upper positioning tube part (14).
- A core drilling tool according to claim 3, characterised in that the upper positioning tube part (14) comprises, extending substantially over the length of its external screw thread (15), axial locking grooves (19) while on the outside of the upper part of the lower positioning tube part (17) there are axial locking grooves (20) and in that an annular member is provided as the locking element (22) and is axially displaceable along the upper positioning tube part (14) and has inwardly directed locking dogs (23) engaging the locking grooves (19) therein while axially downwardly projecting locking dogs (23) can be caused to engage from above the locking grooves (20) in the bottom positioning tube part (17).
- A core drilling tool according to claim 4, characterised in that the upper positioning tube part (14) comprises a pair while the lower positioning tube part (17) comprises two pairs of respectively diametrically disposed locking grooves (19, 20).
- A core drilling tool according to one of claims 3 to 5, characterised in that a locking nut (21) is disposed above the locking element (22) and on the external screw thread (15) on the upper positioning tube part (14).
- A core drilling tool according to one of claims 3 to 6, characterised in that as an adjustment aid markings (25) are provided in the locking grooves (19) on the upper positioning tube part (14).
- A core drilling tool according to one of claims 3 to 7, characterised in that at the bottom end of at least one locking groove (19) on the upper positioning tube part (14) there is for the locking element (22) a locking screw (26) which has its head countersunk into the locking groove (19).
- A core drilling tool according to one of claims 3 to 8, characterised in that a through bore is provided in the lower positioning tube part (17) and is occluded by a countersunk screwed plug (27).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3843800 | 1988-12-24 | ||
| DE3843800A DE3843800C1 (en) | 1988-12-24 | 1988-12-24 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0376044A2 EP0376044A2 (en) | 1990-07-04 |
| EP0376044A3 EP0376044A3 (en) | 1992-02-26 |
| EP0376044B1 true EP0376044B1 (en) | 1995-07-19 |
Family
ID=6370193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89122882A Expired - Lifetime EP0376044B1 (en) | 1988-12-24 | 1989-12-12 | Core-drilling tool |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5025872A (en) |
| EP (1) | EP0376044B1 (en) |
| CA (1) | CA2006607C (en) |
| DE (1) | DE3843800C1 (en) |
| NO (1) | NO895214L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6729416B2 (en) | 2001-04-11 | 2004-05-04 | Schlumberger Technology Corporation | Method and apparatus for retaining a core sample within a coring tool |
| US7431107B2 (en) * | 2003-01-22 | 2008-10-07 | Schlumberger Technology Corporation | Coring bit with uncoupled sleeve |
| US20050133267A1 (en) * | 2003-12-18 | 2005-06-23 | Schlumberger Technology Corporation | [coring tool with retention device] |
| US8613330B2 (en) | 2011-07-05 | 2013-12-24 | Schlumberger Technology Corporation | Coring tools and related methods |
| CN102787818B (en) * | 2012-08-30 | 2015-08-19 | 刘力强 | Small motor-driven geological core driller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4300643A (en) * | 1979-03-22 | 1981-11-17 | Diamant Boart | Double core barrel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1039006B (en) * | 1954-11-17 | 1958-09-18 | Helmut Huegel Dr Ing | Core catcher for deep drilling tools |
| DE1185554B (en) * | 1963-06-21 | 1965-01-21 | Roland Joseph Du Berger | Core tube |
| US4463460A (en) * | 1982-08-13 | 1984-08-07 | Indiana Brass, Inc. | Roman tub fixture |
| US4553613A (en) * | 1983-09-09 | 1985-11-19 | Norton Christensen, Inc. | Hydraulic lift inner barrel in a drill string coring tool |
| US4580643A (en) * | 1984-09-10 | 1986-04-08 | Norton Christensen, Inc. | Adjustable bearing section core barrel |
-
1988
- 1988-12-24 DE DE3843800A patent/DE3843800C1/de not_active Expired - Lifetime
-
1989
- 1989-12-12 EP EP89122882A patent/EP0376044B1/en not_active Expired - Lifetime
- 1989-12-15 US US07/451,090 patent/US5025872A/en not_active Expired - Lifetime
- 1989-12-22 NO NO89895214A patent/NO895214L/en unknown
- 1989-12-22 CA CA002006607A patent/CA2006607C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4300643A (en) * | 1979-03-22 | 1981-11-17 | Diamant Boart | Double core barrel |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0376044A2 (en) | 1990-07-04 |
| NO895214L (en) | 1990-06-25 |
| EP0376044A3 (en) | 1992-02-26 |
| NO895214D0 (en) | 1989-12-22 |
| CA2006607A1 (en) | 1990-06-24 |
| DE3843800C1 (en) | 1990-04-12 |
| US5025872A (en) | 1991-06-25 |
| CA2006607C (en) | 1997-02-11 |
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