EP1704297B1 - Drilling device - Google Patents

Drilling device Download PDF

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Publication number
EP1704297B1
EP1704297B1 EP04804208.9A EP04804208A EP1704297B1 EP 1704297 B1 EP1704297 B1 EP 1704297B1 EP 04804208 A EP04804208 A EP 04804208A EP 1704297 B1 EP1704297 B1 EP 1704297B1
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EP
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Prior art keywords
sealing
borehole
drilling device
drill rod
disk
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EP04804208.9A
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German (de)
French (fr)
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EP1704297B8 (en
EP1704297A1 (en
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Franz-Josef Blickhan
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Prakla Bohrtechnik GmbH
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Prakla Bohrtechnik GmbH
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    • 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
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems

Definitions

  • the invention relates to a drilling apparatus with a drill pipe having a central delivery channel and a supply air duct and a Senkhammer boring head, wherein a between the drill pipe and the borehole wall existing well annulus is sealed by a well seal to the atmosphere, wherein the borehole seal a on Drill rod axially fixed, annular sealing disc having a circumferentially arranged on its flexible sealing lip.
  • a known drilling device ( FR-A-2 597 150 ) serves a central delivery channel of the drill string to promote the cuttings through the upward flowing compressed air.
  • an air duct is arranged in the drill pipe, through which the compressed air is supplied.
  • the centric delivery channel opens into a lateral inlet opening.
  • there is a downwardly open skirt which receives the drill cuttings released by the countersink of the drill head so that it can be conveyed upwards.
  • the wellbore annulus between the drill string and the borehole wall is sealed from the atmosphere by a well seal.
  • the well seal is formed by a casing lining the well bore and an annular cover, the inner edge of which is designed as a sliding seal which sealingly surrounds the circumference of the drill string.
  • the pressure generated by the compressed air supply in the borehole is required to promote the cuttings in the central conveyor channel upwards.
  • the entire well annulus must be sealed between the drill pipe and the borehole wall, otherwise there is a risk that in case of insufficient sealing of the required delivery pressure in the central delivery channel is not available.
  • a disadvantage here proves that the required pressure in the entire well to the well seal must be maintained. This leads to high energy consumption and to a reduction in the delivery rate, especially if the borehole itself is not sufficiently dense on the side.
  • the well seal has an axially fixed to the drill string, annular sealing disc with a on its circumference arranged flexible sealing lip.
  • the object of the invention is therefore to provide a drilling device of the type mentioned in such a way that the required for the promotion of cuttings pressure can be maintained effectively in a simpler manner.
  • the sealing disc has at its inner periphery a central plain bearing bush, which is supported on an upper, connected to the drill pipe support ring.
  • the rotation of the drill string is not hindered by the bearing of the sealing washer via the central plain bearing bush.
  • the plain bearing bush is always located at the same location on the drill string, the seal executed there as a pivot bearing can be designed so that it develops a high sealing effect with relatively low friction. This is a significant advantage over the known well seal, in which the entire drill pipe when sinking through the sealing surface must be passed so that unevenness of the outer surface of the drill string can lead to a reduction of the sealing effect and / or damage to the sealing surface of the borehole seal.
  • the sealing disc with its at least one flexible sealing lip seals directly opposite the borehole wall or that when drilling the bore on the borehole wall a lining pipe is carried, against which seals the sealing disc.
  • This measure is particularly advantageous if the rock is porous or has gaps and is therefore not suitable or even unsuitable for maintaining the pressure.
  • the sealing disc has a plurality of sealing lips on the circumference one above the other. As a result, a significant increase in the sealing effect is achieved compared to a single sealing lip.
  • the drilling apparatus shown in the drawing has a drill pipe, which has a centric conveying channel 2 (FIG. Fig. 2 ) and a surrounding air duct 3 has.
  • a countersink drill head 5 is connected via a connecting piece 4, the percussion drill bit 6 at the lowest point of the borehole 7 dissolves rock by impact, which is transported upwards as cuttings.
  • the Senkhammer-Bohrkopf 5 is supplied to drive his Schlagbohrkrone 6 with compressed air, which is supplied through the air duct 3.
  • a conveying channel section 8 runs obliquely downwards from the central conveying channel 2 of the drill pipe 1 to a lateral inlet opening 9.
  • a downwardly open skirt 10 is mounted, which is formed by a downwardly open tube which is fixed to the connecting piece 4 and is offset from the countersinking drill head 5 to the side of the inlet opening 9 toward eccentric.
  • an inflow opening 11 is formed on the side of this inlet opening 9 at a short distance above the percussion drill bit 6, which is connected via the delivery channel section 8 with the delivery channel 2 in the drill string 1.
  • annular sealing disc 12 is arranged, which is rotatably but immovably mounted on the drill pipe 1 and at its periphery a plurality of flexible sealing lips 13 which sealingly against the borehole wall 14 or at a Drilling the hole on the borehole wall entrained lining pipe 15 (only right in Fig. 1 indicated by dashed lines) seals.
  • the flexible sealing lips 13 can also be folded over in the sealing area in order to achieve an effective seal.
  • Fig. 2 As in Fig. 2 is shown in detail, the sealing disc 12 at its inner periphery on a central plain bearing bush 16, which is supported on an upper, connected to the drill string 1 support ring 17.
  • the sealing disk 12 has a plurality of rigid annular disks 18 stacked on top of one another, between which in each case a rubber-elastic annular disk 19 is arranged whose peripheral edge projecting beyond the rigid annular disks 18 forms the sealing lip 13.
  • the rigid annular discs 18 are connected by screws 20, 21 with each other. Near its inner edge, the rigid sealing discs 18 are connected by screws 21 with each other and with an upper flange 22 of the plain bearing bush 16.
  • the support ring 17 has a mounting hole 23 through which the arranged on the inner edge of the rigid annular discs 18 screws 21 are accessible one after the other rotation of the sealing disc 12.
  • the screws 21 are screwed into a lower ring 24, which compresses all the discs of the sealing disc 12 at the inner edge.
  • the central plain bearing bush 16 is rotatably received between the upper support ring 17 and a lower support ring 25 which is attached to the drill pipe 1.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Description

Die Erfindung betrifft eine Bohrvorrichtung mit einem Bohrgestänge, das einen zentrischen Förderkanal und einen Zuluftkanal aufweist und einen Senkhammer-Bohrkopf trägt, wobei ein zwischen dem Bohrgestänge und der Bohrlochwand bestehender Bohrloch-Ringraum durch eine Bohrlochdichtung gegenüber der Atmosphäre abgedichtet ist, wobei die Bohrlochdichtung eine am Bohrgestänge axial festgelegte, kreisringförmige Dichtscheibe mit einer an ihrem Umfang angeordneten flexiblen Dichtlippe aufweist.The invention relates to a drilling apparatus with a drill pipe having a central delivery channel and a supply air duct and a Senkhammer boring head, wherein a between the drill pipe and the borehole wall existing well annulus is sealed by a well seal to the atmosphere, wherein the borehole seal a on Drill rod axially fixed, annular sealing disc having a circumferentially arranged on its flexible sealing lip.

Senkhammer-Bohrköpfe werden für Brunnenbohrungen und andere Tieflochbohrungen in Fels und Gestein verwendet. Der Senkhammer wird durch Pressluft angetrieben, die durch das Bohrgestänge zugeführt wird. Die Pressluft tritt an der Schlagbohrkrone aus und fördert das anfallende Bohrklein nach oben.Countersink drill bits are used for well drilling and other deep hole drilling in rock and rock. The countersink is powered by compressed air supplied through the drill string. The compressed air exits the percussion drill bit and conveys the accumulated drill cuttings upwards.

Bei einer bekannten Bohrvorrichtung ( FR-A-2 597 150 ) dient ein zentrischer Förderkanal des Bohrgestänges zur Förderung des Bohrkleins durch die nach oben strömende Pressluft. Am Umfang des zentrischen Förderkanals ist im Bohrgestänge ein Luftkanal angeordnet, durch den die Pressluft zugeführt wird. Der zentrische Förderkanal mündet in einer seitlichen Eintrittsöffnung. Im Bereich der seitlichen Eintrittsöffnung befindet sich eine nach unten offene Schürze, die das durch den Senkhammer des Bohrkopf losgeschlagene Bohrklein aufnimmt, so dass es nach oben gefördert werden kann.In a known drilling device ( FR-A-2 597 150 ) serves a central delivery channel of the drill string to promote the cuttings through the upward flowing compressed air. On the circumference of the centric conveying channel, an air duct is arranged in the drill pipe, through which the compressed air is supplied. The centric delivery channel opens into a lateral inlet opening. In the area of the lateral inlet opening, there is a downwardly open skirt which receives the drill cuttings released by the countersink of the drill head so that it can be conveyed upwards.

Bei einer bekannten Bohrvorrichtung der eingangs genannten Gattung ( EP 0 690 953 B1 ) ist die Schürze gegenüber dem Senkhammer-Bohrkopf zur Seite der Eintrittsöffnung hin exzentrisch versetzt. Dadurch befindet sich der größte Eintrittsquerschnitt in die Schürze unterhalb der Eintrittsöffnung, so dass auch verhältnismäßig große Stücke des Bohrkleins ohne Schwierigkeiten weggefördert werden können.In a known drilling device of the type mentioned ( EP 0 690 953 B1 ) the apron is offset eccentrically with respect to the countersinking drill head to the side of the inlet opening. As a result, the largest inlet cross section is in the skirt below the inlet opening, so that relatively large pieces of cuttings can be carried away without difficulty.

Der zwischen dem Bohrgestänge und der Bohrlochwand bestehende Bohrloch-Ringraum ist durch eine Bohrlochdichtung gegenüber der Atmosphäre abgedichtet. Die Bohrlochdichtung wird durch ein die Bohrlochöffnung auskleidendes Futterrohr und einen ringförmigen Deckel gebildet, dessen innerer Rand als eine Gleitdichtung ausgeführt ist, die den Umfang des Bohrgestänges abdichtend umschließt.The wellbore annulus between the drill string and the borehole wall is sealed from the atmosphere by a well seal. The well seal is formed by a casing lining the well bore and an annular cover, the inner edge of which is designed as a sliding seal which sealingly surrounds the circumference of the drill string.

Der durch die Pressluftzufuhr im Bohrloch erzeugte Druck ist erforderlich, um das Bohrklein im zentrischen Förderkanal nach oben zu fördern. Hierbei muss der gesamte Bohrloch-Ringraum zwischen dem Bohrgestänge und der Bohrlochwand abgedichtet werden, weil anderenfalls die Gefahr besteht, dass bei unzureichender Abdichtung der erforderliche Förderdruck im zentrischen Förderkanal nicht zur Verfügung steht. Als nachteilig erweist sich hierbei, dass der erforderliche Druck im gesamten Bohrloch bis hin zur Bohrlochdichtung aufrechterhalten werden muss. Dies führt zu einem hohen Energieverbrauch und zu einer Verringerung der Förderleistung, insbesondere wenn das Bohrloch selbst seitlich nicht ausreichend dicht ist.The pressure generated by the compressed air supply in the borehole is required to promote the cuttings in the central conveyor channel upwards. In this case, the entire well annulus must be sealed between the drill pipe and the borehole wall, otherwise there is a risk that in case of insufficient sealing of the required delivery pressure in the central delivery channel is not available. A disadvantage here proves that the required pressure in the entire well to the well seal must be maintained. This leads to high energy consumption and to a reduction in the delivery rate, especially if the borehole itself is not sufficiently dense on the side.

Bei einem Wechsel des Bohrgestänges, beispielsweise zum Austauschen der Schlagbohrkrone, muss die Bohrlochdichtung abmontiert werden.When changing the drill string, for example, to replace the percussion drill, the borehole seal must be removed.

Da das gesamte Bohrgestänge beim Abteufen durch die Dichtfläche hindurchgeführt werden muss, führen Ungleichmäßigkeiten der äußeren Oberfläche des Bohrgestänges hierbei zu einer Verringerung der Dichtwirkung und/oder einer Beschädigung der Dichtfläche an der Bohrlochdichtung.Since the entire drill string must be passed through the sealing surface during drilling, unevenness of the outer surface of the drill string in this case lead to a reduction of the sealing effect and / or damage to the sealing surface of the borehole seal.

Beispielsweise in FR 2 496 160 A oder in US 4 657 092 A sind über ein Kugellager drehbar gelagerte Dichtungselemente beschrieben.For example in FR 2 496 160 A or in US 4 657 092 A are described via a ball bearing rotatably mounted sealing elements.

In US 4 057 118 A ist eine Bohrlochdichtung mit mehreren elastischen Dichtlippen beschrieben, die zu einem Paket kombiniert wurden und durch einen in axialer Richtung ausgeübten Anpressdruck miteinander verbunden sind.In US 4 057 118 A is a well seal with multiple elastic sealing lips described, which have been combined to form a package and are connected by a force exerted in the axial direction contact pressure.

Bei einer Bohrvorrichtung der eingangs genannten Gattung, wie sie beispielsweise in DE 42 25 806 C1 beschrieben ist, weist die Bohrlochdichtung eine am Bohrgestänge axial festgelegte, kreisringförmige Dichtscheibe mit einer an ihrem Umfang angeordneten flexiblen Dichtlippe auf.In a drilling device of the type mentioned, as shown for example in DE 42 25 806 C1 is described, the well seal has an axially fixed to the drill string, annular sealing disc with a on its circumference arranged flexible sealing lip.

Aufgabe der Erfindung ist es daher, eine Bohrvorrichtung der eingangs genannten Gattung so auszubilden, dass der für die Förderung des Bohrkleins erforderliche Druck in einfacherer Weise wirksam aufrechterhalten werden kann.The object of the invention is therefore to provide a drilling device of the type mentioned in such a way that the required for the promotion of cuttings pressure can be maintained effectively in a simpler manner.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Dichtscheibe drehbar gelagert ist und an ihrem inneren Umfang eine zentrale Gleitlagerbüchse aufweist, dass die Dichtscheibe mehrere, übereinander gestapelte starre Ringscheiben aufweist, zwischen denen jeweils eine gummielastische Ringscheibe angeordnet ist, deren über die starren Ringscheiben hinausragender Umfangsrand die Dichtlippe bildet, dass die starren Ringscheiben nahe ihrem inneren Rand durch Schrauben miteinander und mit einem oberen Flansch der Gleitlagerbüchse verbunden sind, die sich an einem oberen, mit dem Bohrgestänge verbundenen Stützring abstützt, und dass der Stützring eine Montagebohrung aufweist, durch die die am inneren Rand der starren Ringscheiben angeordneten Schrauben nach Drehung der Dichtscheibe einzeln nacheinander zugänglich sind.This object is achieved in that the sealing disc is rotatably mounted and has on its inner circumference a central plain bearing bush, that the sealing disc has a plurality of stacked rigid annular discs, between each of which a rubber-elastic annular disc is arranged, whose over the rigid discs protruding peripheral edge the sealing lip forms that the rigid annular discs are connected near their inner edge by screws with each other and with an upper flange of the plain bearing bush, which is supported on an upper, connected to the drill string support ring, and that the support ring has a mounting hole through which the on inner edge of the rigid washers arranged screws after rotation of the sealing disc are individually accessible successively.

Die Dichtscheibe kann in geeignetem Abstand, vorzugsweise in geringem Abstand oberhalb des Bohrkopfes angeordnet werden und dichtet das Bohrloch an dieser Stelle in geringem Abstand oberhalb des Bohrkopfes ab. Eine Abdichtung am oberen Ende des Bohrlochs ist damit nicht erforderlich. Der mit Druck beaufschlagte Raum ist verhältnismäßig klein, nämlich nur der zwischen dem Bohrlochende und der Dichtscheibe liegende Abschnitt des Bohrloch-Ringraums, während der darüber liegende, wesentlich größere Teil des Bohrloch-Ringraums nicht mit erhöhtem Druck beaufschlagt ist und deshalb auch nicht abgedichtet werden muss. Eine etwaige Porosität in Bereichen des Bohrlochs, insbesondere im oberen Bereich, beeinflusst die Aufrechterhaltung des Drucks nicht oder nur unwesentlich.The sealing disc can be arranged at a suitable distance, preferably at a small distance above the drill head be and seals the hole at this point a short distance above the drill head. A seal at the top of the borehole is therefore not required. The pressurized space is relatively small, namely only the portion of the well annulus located between the wellbore and the gasket, while the overlying, substantially larger portion of the well annulus is not subjected to elevated pressure and, therefore, need not be sealed , Any porosity in areas of the borehole, especially in the upper area, does not affect the maintenance of the pressure or only insignificantly.

Da die die Bohrlochdichtung bildende Dichtscheibe während des Abteufens mitgeführt wird, bleibt der mit Druck zu beaufschlagende Raum während des gesamten Bohrvorgangs unabhängig von der jeweiligen Bohrtiefe unverändert.Since the gasket forming the borehole seal is entrained during drilling, the pressurized space throughout the drilling operation remains unchanged regardless of the respective drilling depth.

Weiterhin ist erfindungsgemäß vorgesehen, dass die Dichtscheibe an ihrem inneren Umfang eine zentrale Gleitlagerbüchse aufweist, die sich an einem oberen, mit dem Bohrgestänge verbundenen Stützring abstützt. Die Drehung des Bohrgestänges wird durch die Lagerung der Dichtscheibe über die zentrale Gleitlagerbüchse nicht behindert. Da sich die Gleitlagerbüchse stets an der selben Stelle am Bohrgestänge befindet, kann die dort als Drehlager ausgeführte Dichtung so gestaltet werden, dass sie bei verhältnismäßig geringer Reibung eine hohe Dichtwirkung entfaltet. Dies ist von wesentlichem Vorteil gegenüber der bekannten Bohrlochdichtung, bei der das gesamte Bohrgestänge beim Abteufen durch die Dichtfläche hindurchgeführt werden muss, so dass Ungleichmäßigkeiten der äußeren Oberfläche des Bohrgestänges zu einer Verringerung der Dichtwirkung und/oder einer Beschädigung der Dichtfläche an der Bohrlochdichtung führen können.Furthermore, the invention provides that the sealing disc has at its inner periphery a central plain bearing bush, which is supported on an upper, connected to the drill pipe support ring. The rotation of the drill string is not hindered by the bearing of the sealing washer via the central plain bearing bush. Since the plain bearing bush is always located at the same location on the drill string, the seal executed there as a pivot bearing can be designed so that it develops a high sealing effect with relatively low friction. This is a significant advantage over the known well seal, in which the entire drill pipe when sinking through the sealing surface must be passed so that unevenness of the outer surface of the drill string can lead to a reduction of the sealing effect and / or damage to the sealing surface of the borehole seal.

Je nach der Beschaffenheit der Bohrlochwand kann vorgesehen sein, dass die Dichtscheibe mit ihrer mindestens einen flexiblen Dichtlippe unmittelbar gegenüber der Bohrlochwand abdichtet oder dass beim Abteufen der Bohrung an der Bohrlochwand ein Auskleidungsrohr mitgeführt wird, gegenüber dem die Dichtscheibe abdichtet. Diese Maßnahme ist besonders vorteilhaft, wenn das Gestein porös ist oder Spalten aufweist und deshalb selbst zur Aufrechterhaltung des Drucks nicht oder wenig geeignet ist.Depending on the nature of the borehole wall can be provided that the sealing disc with its at least one flexible sealing lip seals directly opposite the borehole wall or that when drilling the bore on the borehole wall a lining pipe is carried, against which seals the sealing disc. This measure is particularly advantageous if the rock is porous or has gaps and is therefore not suitable or even unsuitable for maintaining the pressure.

Mit der erfindungsgemäßen Maßnahme zur Abdichtung des Bohrlochs wird gegenüber dem Stand der Technik eine erhebliche Verminderung des Energiebedarfs und eine wesentliche Steigerung der Bohrleistung erreicht.With the measure according to the invention for sealing the borehole, a considerable reduction of the energy requirement and a substantial increase in the drilling capacity are achieved compared with the prior art.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist vorgesehen, dass die Dichtscheibe am Umfang übereinander mehrere Dichtlippen aufweist. Dadurch wird im Vergleich zu einer einzigen Dichtlippe eine wesentliche Steigerung der Dichtwirkung erreicht.According to a preferred embodiment of the invention it is provided that the sealing disc has a plurality of sealing lips on the circumference one above the other. As a result, a significant increase in the sealing effect is achieved compared to a single sealing lip.

Weitere vorteilhafte Ausgestaltungen des Erfindungsgedankens sind Gegenstand weiterer Unteransprüche.Further advantageous embodiments of the inventive concept are the subject of further subclaims.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel näher erläutert, das in der Zeichnung dargestellt ist. Es zeigt:

  • Fig. 1 in einem vereinfachten Längsschnitt eine Bohrvorrichtung in einem Bohrloch und
  • Fig. 2 eine vergrößerte Schnittdarstellung der bei der Bohrvorrichtung nach Fig. 1 verwendeten Dichtscheibe und des zugehörigen Bohrgestängeabschnitts.
The invention is described below using an exemplary embodiment explained in more detail, which is shown in the drawing. It shows:
  • Fig. 1 in a simplified longitudinal section a drilling device in a borehole and
  • Fig. 2 an enlarged sectional view of the drilling device according to Fig. 1 used sealing washer and the associated drill string section.

Die in der Zeichnung dargestellte Bohrvorrichtung weist ein Bohrgestänge auf, das einen zentrischen Förderkanal 2 (Fig. 2) und einen umgebenden Luftkanal 3 besitzt. Am Bohrgestänge 1 ist über ein Verbindungsstück 4 ein Senkhammer-Bohrkopf 5 angeschlossen, dessen Schlagbohrkrone 6 an der tiefsten Stelle des Bohrlochs 7 durch Schlagwirkung Gestein löst, das als Bohrklein nach oben transportiert wird.The drilling apparatus shown in the drawing has a drill pipe, which has a centric conveying channel 2 (FIG. Fig. 2 ) and a surrounding air duct 3 has. On drill pipe 1, a countersink drill head 5 is connected via a connecting piece 4, the percussion drill bit 6 at the lowest point of the borehole 7 dissolves rock by impact, which is transported upwards as cuttings.

Der Senkhammer-Bohrkopf 5 wird zum Antrieb seiner Schlagbohrkrone 6 mit Pressluft versorgt, die durch den Luftkanal 3 zugeführt wird. Im Verbindungsstück 4 verläuft ein Förderkanalabschnitt 8 vom zentrischen Förderkanal 2 des Bohrgestänges 1 schräg nach unten zu einer seitlichen Eintrittsöffnung 9.The Senkhammer-Bohrkopf 5 is supplied to drive his Schlagbohrkrone 6 with compressed air, which is supplied through the air duct 3. In the connecting piece 4, a conveying channel section 8 runs obliquely downwards from the central conveying channel 2 of the drill pipe 1 to a lateral inlet opening 9.

Am Verbindungsstück 4 ist eine nach unten offene Schürze 10 angebracht, die von einem nach unten offenen Rohr gebildet wird, das am Verbindungsstück 4 befestigt ist und gegenüber dem Senkhammer-Bohrkopf 5 zur Seite der Eintrittsöffnung 9 hin exzentrisch versetzt ist. Dadurch wird auf der Seite dieser Eintrittsöffnung 9 in geringem Abstand oberhalb der Schlagbohrkrone 6 eine Einströmöffnung 11 gebildet, die über den Förderkanalabschnitt 8 mit dem Förderkanal 2 im Bohrgestänge 1 verbunden ist.On the connector 4, a downwardly open skirt 10 is mounted, which is formed by a downwardly open tube which is fixed to the connecting piece 4 and is offset from the countersinking drill head 5 to the side of the inlet opening 9 toward eccentric. As a result, an inflow opening 11 is formed on the side of this inlet opening 9 at a short distance above the percussion drill bit 6, which is connected via the delivery channel section 8 with the delivery channel 2 in the drill string 1.

In geringem Abstand oberhalb des Bohrkopfes ist eine kreisringförmige Dichtscheibe 12 angeordnet, die drehbar, aber unverschiebbar am Bohrgestänge 1 gelagert ist und an ihrem Umfang mehrere flexible Dichtlippen 13 aufweist, die abdichtend an der Bohrlochwand 14 oder an einem beim Abteufen der Bohrung an der Bohrlochwand mitgeführten Auskleidungsrohr 15 (nur rechts in Fig. 1 mit gestrichelten Linien angedeutet) abdichtet. Abweichend von der Darstellung in Fig. 1 können sich die flexiblen Dichtlippen 13 im Dichtbereich auch umlegen, um eine wirksame Abdichtung zu erreichen.At a short distance above the drill head, an annular sealing disc 12 is arranged, which is rotatably but immovably mounted on the drill pipe 1 and at its periphery a plurality of flexible sealing lips 13 which sealingly against the borehole wall 14 or at a Drilling the hole on the borehole wall entrained lining pipe 15 (only right in Fig. 1 indicated by dashed lines) seals. Deviating from the illustration in Fig. 1 For example, the flexible sealing lips 13 can also be folded over in the sealing area in order to achieve an effective seal.

Wie in Fig. 2 in Einzelheiten dargestellt ist, weist die Dichtscheibe 12 an ihrem inneren Umfang eine zentrale Gleitlagerbüchse 16 auf, die sich an einem oberen, mit dem Bohrgestänge 1 verbundenen Stützring 17 abstützt.As in Fig. 2 is shown in detail, the sealing disc 12 at its inner periphery on a central plain bearing bush 16, which is supported on an upper, connected to the drill string 1 support ring 17.

Die Dichtscheibe 12 weist mehrere, übereinander gestapelte starre Ringscheiben 18 auf, zwischen denen jeweils eine gummielastische Ringscheibe 19 angeordnet ist, deren über die starren Ringscheiben 18 hinausragender Umfangsrand die Dichtlippe 13 bildet.The sealing disk 12 has a plurality of rigid annular disks 18 stacked on top of one another, between which in each case a rubber-elastic annular disk 19 is arranged whose peripheral edge projecting beyond the rigid annular disks 18 forms the sealing lip 13.

Die starren Ringscheiben 18 sind durch Schrauben 20, 21 miteinander verbunden. Nahe ihrem inneren Rand sind die starren Dichtscheiben 18 durch Schrauben 21 miteinander und mit einem oberen Flansch 22 der Gleitlagerbüchse 16 verbunden.The rigid annular discs 18 are connected by screws 20, 21 with each other. Near its inner edge, the rigid sealing discs 18 are connected by screws 21 with each other and with an upper flange 22 of the plain bearing bush 16.

Der Stützring 17 weist eine Montagebohrung 23 auf, durch die die am inneren Rand der starren Ringscheiben 18 angeordneten Schrauben 21 nach Drehung der Dichtscheibe 12 einzeln nacheinander zugänglich sind. Die Schrauben 21 sind in einen unteren Ring 24 eingeschraubt, der alle Scheiben der Dichtscheibe 12 am inneren Rand zusammenpresst.The support ring 17 has a mounting hole 23 through which the arranged on the inner edge of the rigid annular discs 18 screws 21 are accessible one after the other rotation of the sealing disc 12. The screws 21 are screwed into a lower ring 24, which compresses all the discs of the sealing disc 12 at the inner edge.

Die zentrale Gleitlagerbüchse 16 ist zwischen dem oberen Stützring 17 und einem unteren Tragring 25, der am Bohrgestänge 1 angebracht ist, drehbar aufgenommen.The central plain bearing bush 16 is rotatably received between the upper support ring 17 and a lower support ring 25 which is attached to the drill pipe 1.

Durch die Pressluft, die dem Senkhammer-Bohrkopf durch den Luftkanal 3 zugeführt wird und ihn antreibt und die an der Unterseite des Bohrkopfs austritt, wird das anfallende Bohrklein durch die Eintrittsöffnung 11 der Schürze 10, den Förderkanalabschnitt 8 und den zentrischen Förderkanal 2 nach oben gefördert. Zugleich wird dadurch in einem unterhalb der Dichtscheibe 12 liegenden Bohrloch-Ringraumabschnitt 26 ein erhöhter Druck aufgebaut, der durch die Dichtwirkung der Dichtscheibe 12 aufrechterhalten wird. Beim weiteren Abteufen des Bohrkopfes wird die Dichtscheibe 12 mitgeführt.By the compressed air, which is supplied to the countersinking drill head through the air duct 3 and drives him and exiting at the bottom of the drill head, the resulting cuttings through the inlet opening 11 of the skirt 10, the conveying channel section 8 and the central conveyor channel 2 is conveyed upwards , At the same time an increased pressure is thereby built up in a lying below the sealing washer 12 borehole annulus section 26, which is maintained by the sealing action of the sealing disc 12. Upon further drilling of the drill head, the sealing disk 12 is carried along.

Claims (4)

  1. Drilling device with a drill rod (1) having a centric conveyor duct (2) and an air supply duct and bearing a drop hammer drill head (5), wherein an annular borehole space present between the drill rod (1) and the borehole wall is sealed off by a borehole sealing with respect to the atmosphere, wherein the borehole sealing has a circular sealing disk (12) which is secured axially to the drill rod (1) and has a flexible sealing lip (13) arranged at its circumference,
    characterized in that
    the sealing disk (12) is supported in a rotatable manner and has a central plain bearing bush (16) at its inner circumference, in that the sealing disk (12) has several rigid annular disks (18) stacked on top of each other, between which a rubber-elastic annular disk (19) is arranged in each case, whose circumferential edge projecting beyond the rigid annular disks (18) forms the sealing lip (13), in that near their inner edge the rigid annular disks (18) are connected by screws (21) to each other and to an upper flange (22) of the plain bearing bush (16), which is supported by an upper support ring (17) connected to the drill rod (1), and in that the support ring (17) has a mounting bore (23), through which the screws (21) arranged on the inner edge of the rigid annular disks (18) are individually accessible one after the other after rotation of the sealing disk (12).
  2. Drilling device according to claim 1,
    characterized in that
    the central plain bearing bush (16) is accommodated in a rotatable manner between the upper support ring (17) and a lower bearing ring (25) of the drill rod (1).
  3. Drilling device according to claim 1,
    characterized in that
    the sealing disk (12) with its flexible sealing lips (13) seals off with respect to a lining pipe (15) led along on the borehole wall (14) during the sinking of the borehole.
  4. Drilling device according to claim 1,
    characterized in that
    the sealing disk (12) with its flexible sealing lips (13) seals off with respect to the borehole wall (14).
EP04804208.9A 2003-12-22 2004-12-22 Drilling device Active EP1704297B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003161080 DE10361080A1 (en) 2003-12-22 2003-12-22 drilling
PCT/EP2004/014612 WO2005061843A1 (en) 2003-12-22 2004-12-22 Drilling device

Publications (3)

Publication Number Publication Date
EP1704297A1 EP1704297A1 (en) 2006-09-27
EP1704297B1 true EP1704297B1 (en) 2014-05-07
EP1704297B8 EP1704297B8 (en) 2014-06-18

Family

ID=34706550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04804208.9A Active EP1704297B8 (en) 2003-12-22 2004-12-22 Drilling device

Country Status (3)

Country Link
EP (1) EP1704297B8 (en)
DE (1) DE10361080A1 (en)
WO (1) WO2005061843A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005026921A1 (en) * 2005-06-10 2006-12-21 Geomechanik Wasser- Und Umwelttechnik Gmbh Hammer-drilling arrangement for drilling purposes comprises a hammer-drill head, a flushing medium supply unit, a drill pipe with a conveying channel for the drillings and an overlaying pipe connected to a drilling crown
ATE369481T1 (en) * 2005-06-10 2007-08-15 Geomechanik Wasser Und Umweltt COUNTERSUNK HAMMER DRILLING APPARATUS AND METHOD
DE102007043621B4 (en) * 2007-09-13 2013-03-28 Stump Spezialtiefbau Gmbh bore seal
CN113323581A (en) * 2021-05-30 2021-08-31 徐州基桩工程公司 Structure of slag discharging device of pneumatic down-the-hole hammer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1472555A (en) * 1921-08-13 1923-10-30 Erd V Crowell Oil or gas well
US4057118A (en) 1975-10-02 1977-11-08 Walker-Neer Manufacturing Co., Inc. Bit packer for dual tube drilling
US4321975A (en) * 1980-06-02 1982-03-30 Dyer Ronald S Slurry diverter
FR2496160A1 (en) 1980-12-11 1982-06-18 Lamothe Andre Sealed connector for deep drilling tools - where drilling liq. can be fed to tool, or another liq. can be fed into drilled hole without reaching the tool
US4657092A (en) 1985-07-17 1987-04-14 J & F Oil Tools, Inc. Circulation reversing tool
FR2597150B1 (en) 1986-04-11 1988-09-09 Boniface Andre IMPROVEMENT IN SOIL DRILLING DEVICES INCLUDING A DRILLING TOOL FIXED AT THE END OF A ROD FORMED FROM TWO CONCENTRIC TUBES
DE8902189U1 (en) * 1989-02-24 1989-05-03 Turmag Turbo-Maschinen-Ag Nuesse & Graefer, 4322 Sprockhoevel, De
DE4225806C1 (en) 1992-08-05 1993-12-16 Klemm Bohrtech Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier
DE4310726A1 (en) 1993-04-02 1994-10-06 Franz Blickhan Drill pipe with countersunk hammer drill head

Also Published As

Publication number Publication date
EP1704297B8 (en) 2014-06-18
DE10361080A1 (en) 2005-07-28
WO2005061843A1 (en) 2005-07-07
EP1704297A1 (en) 2006-09-27

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