EP0690953B1 - Drilling apparatus with drill string and percussion hammer drilling head - Google Patents
Drilling apparatus with drill string and percussion hammer drilling head Download PDFInfo
- Publication number
- EP0690953B1 EP0690953B1 EP94912494A EP94912494A EP0690953B1 EP 0690953 B1 EP0690953 B1 EP 0690953B1 EP 94912494 A EP94912494 A EP 94912494A EP 94912494 A EP94912494 A EP 94912494A EP 0690953 B1 EP0690953 B1 EP 0690953B1
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- drilling
- drill
- compressed air
- pipe
- drill pipe
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- 238000005553 drilling Methods 0.000 title claims abstract description 34
- 238000009527 percussion Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims 5
- 238000010168 coupling process Methods 0.000 claims 5
- 238000005859 coupling reaction Methods 0.000 claims 5
- 238000012856 packing Methods 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 15
- 239000007788 liquid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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 device according to the preamble of claim 1.
- the pneumatic hammer When using a hammer drill, the pneumatic hammer is at the lowest point in the borehole.
- the compressed air required for the hammer drive is fed through the drill pipe designed as a simple drill pipe.
- the compressed air emerges at the percussion drill bit and flows upwards in the space between the borehole wall and the drill pipe, the cuttings generated during drilling being conveyed upwards.
- a drilling device of the type mentioned is known from FR-A-2 597 150.
- the apron which is arranged in the region of the lateral inlet openings of the connecting piece and is open at the bottom is a tube which concentrically surrounds the drill head and forms a circumferential inlet gap with a constant gap width. Therefore only pieces of cuttings that are smaller than this gap width can be removed.
- the object of the invention is therefore to design a drill pipe with a countersink drill head of the type mentioned in such a way that a substantial reduction in the energy requirement is achieved using conventional countersink drill heads, but at the same time the largest possible pieces of cuttings can be conveyed away.
- the compressed air required to drive the Senkhammer drill head is conducted within the connection piece from the air duct opening at the circumference downward to the central connecting piece of the Senkhammer drill head. This ensures that the Senkhammer drill head is still attached centrally to the drill string, which is necessary for reasons of force application, and that the compressed air supply continues to be centered on the connector, so that design changes to the Senkhammer drill head are not required. Therefore the conventional Senkhammer drill heads can be used unchanged.
- the apron which is tightly attached to the connecting piece and surrounds the drive part of the countersink drill head, is primarily open in the area below the lateral inlet opening of the connecting piece, in order to accommodate the drilling cuttings which occur during drilling immediately above the percussion drill bit.
- the water column which is usually present in the borehole, presses the cuttings with the compressed air into the apron, which is open at the bottom, from where it reaches the central production channel of the drill pipe in an essentially unobstructed flow channel and is conveyed upwards.
- the apron is a tube which is connected to the connecting piece and is open at the bottom and which is offset eccentrically with respect to the countersink drill head on the side of the inlet opening.
- the drill pipe is sealed off from the borehole opening and the space between the drill pipe and the borehole opening is connected to a supply line for compressed air and / or water.
- a supply line for compressed air and / or water is connected to a supply line for compressed air and / or water.
- the drill pipe 1 used in the illustrated exemplary embodiments and carried by a drilling device consists of a drill pipe 2 with a central conveying channel 3 and an air channel 4 arranged on its circumference and is therefore also referred to as a two-way drill pipe.
- a connector 5 is attached, preferably welded.
- the Connector 5 is screwed from below a conventional countersink drill head 6 with its central connector 7, which has a compressed air supply opening 8 through which the countersink drill head 6 is supplied with compressed air for driving its hammer drill bit 9.
- the diameter of the percussion drill bit 9 is larger than that of the drill pipe 2 and also larger than the diameter of the drive part of the countersink drill head 6.
- a conveying duct section 10 runs obliquely downward from the central conveying duct 3 of the drill pipe 2 to a lateral inlet opening 11.
- the air channel 4 of the drill pipe 2 opens into an end groove 12 of the connecting piece 5 concentrically surrounding the upper opening of the conveying channel section 10. From an circumferential point of this groove 12, which acts as an annular collecting channel, an air channel section 13 runs obliquely downward to the central connecting piece 7 of the drilling head 6 it can be seen from the drawing that the air duct section 13 runs approximately parallel to the conveying duct section 10.
- a downwardly open apron 14 is attached to the connecting piece 5.
- This apron 14 is formed by a downwardly open tube which is screwed onto the connecting piece 5 and is offset eccentrically with respect to the countersink drill head 6 on the side of the inlet opening 11.
- an inflow opening 15 is formed on the side of this inlet opening 11 at a short distance above the percussion drill bit 9 and is connected to the delivery channel 3 in the drill pipe 2 via the delivery channel section 10.
- the compressed air flows through the air duct section 13 and the compressed air supply opening 8 of the central connector 7 in the Senkhammer-Bohrkopf 6 and drives the percussion drill bit 9 to striking movements.
- the entire drill pipe 1 with the hanging hammer drill head 6 attached to it is rotated by the supporting drill.
- the compressed air emerges downward from the percussion drill bit 9 through air ducts 16 indicated in dashed lines in the drawing and takes the resulting cuttings in the water-filled borehole into the opening 15 of the apron 14.
- the drilling cuttings are entrained by the water-air mixture flowing upward in the apron 14, the conveying duct section 10 and the conveying duct 3 and transported upwards.
- Fig. 2 it is indicated that the drill pipe 2 is sealed from the borehole opening.
- the borehole opening is lined with a casing 17 which is movably sealed with respect to the drill pipe 2 by means of a sliding seal 18.
- a supply line 20 for compressed air and / or water which is only schematically indicated in FIG. 2, opens into the intermediate space 19 between the drill pipe 2 and the borehole opening. As a result, a pressure can be maintained in this intermediate space 19, which supports the conveying of the cuttings into the apron 14. If there is still no water in the borehole in the initial section of a borehole, water can be supplied via the line 20, which is required for the transportation of the cuttings by means of a lifting action by means of the compressed air.
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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)
Abstract
Description
Die Erfindung betrifft eine Bohrvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a drilling device according to the preamble of claim 1.
Bei der Verwendung von Senkhammer-Bohrköpfen befindet sich der durch Preßluft angetriebene Senkhammer an der tiefsten Stelle im Bohrloch. Die zum Hammerantrieb erforderliche Preßluft wird durch das als einfaches Bohrrohr ausgeführte Bohrgestänge zugeführt. Die Preßluft tritt an der Schlagbohrkrone aus und strömt im Zwischenraum zwischen der Bohrlochwandung und dem Bohrgestänge nach oben, wobei das beim Bohren anfallende Bohrklein nach oben gefördert wird.When using a hammer drill, the pneumatic hammer is at the lowest point in the borehole. The compressed air required for the hammer drive is fed through the drill pipe designed as a simple drill pipe. The compressed air emerges at the percussion drill bit and flows upwards in the space between the borehole wall and the drill pipe, the cuttings generated during drilling being conveyed upwards.
Um eine für die Aufrechterhaltung der Förderwirkung ausreichende Strömungsgeschwindigkeit zu erreichen und aufrechtzuerhalten, müssen sehr große Preßluftmengen zugeführt werden. Beispielsweise ist es erforderlich, bei einem Bohrungsdurchmesser von etwa 380 mm und einem Bohrrohrdurchmesser von etwa 150 mm etwa 25-30 m3 Preßluft einzusetzen; damit wird die erforderliche Strömungsgeschwindigkeit von etwa 30 m/sec im Ringraum zwischen dem Bohrrohr und der Bohrungswandung erreicht. Hierfür sind Kompressoren sehr hoher Leistung erforderlich, die demzufolge einen sehr hohen Energiebedarf von beispielsweise 100 l Dieselkraftstoff pro Stunde haben. Der Betrieb der Dieselmotoren für den Antrieb der Kompressoren stellt eine erhebliche Umweltbelastung dar.In order to achieve and maintain a flow rate sufficient to maintain the delivery effect, very large amounts of compressed air must be supplied. For example, it is necessary to use about 25-30 m3 of compressed air with a bore diameter of about 380 mm and a drill pipe diameter of about 150 mm; the required flow velocity of about 30 m / sec in the annular space between the drill pipe and the bore wall is thus achieved. This requires compressors of very high performance, which consequently have a very high energy requirement of, for example, 100 l of diesel fuel per hour. Operation of the diesel engine for the The drive of the compressors represents a considerable environmental burden.
Eine Bohrvorrichtung der eingangs genannten Gattung ist aus der FR-A-2 597 150 bekannt. Die im Bereich der seitlichen Eintrittsöffnungen des Verbindungsstücks angeordnete, nach unten offene Schürze ist hierbei ein Rohr, das den Bohrkopf konzentrisch umgibt und gegenüber diesem einen umlaufenden Eintrittsspalt von gleichbleibender Spaltbreite bildet. Deshalb können nur solche Stücke von Bohrklein weggefördert werden, die kleiner als diese Spaltbreite sind.A drilling device of the type mentioned is known from FR-A-2 597 150. The apron which is arranged in the region of the lateral inlet openings of the connecting piece and is open at the bottom is a tube which concentrically surrounds the drill head and forms a circumferential inlet gap with a constant gap width. Therefore only pieces of cuttings that are smaller than this gap width can be removed.
Aufgabe der Erfindung ist es daher, ein Bohrgestänge mit einem Senkhammer-Bohrkopf der eingangs genannten Gattung so auszugestalten, daß unter Verwendung herkömmlicher Senkhammer-Bohrköpfe eine wesentliche Verringerung des Energiebedarfs erreicht wird, zugleich aber möglichst große Stücke von Bohrklein weggefördert werden können.The object of the invention is therefore to design a drill pipe with a countersink drill head of the type mentioned in such a way that a substantial reduction in the energy requirement is achieved using conventional countersink drill heads, but at the same time the largest possible pieces of cuttings can be conveyed away.
Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Dadurch wird erreicht, daß der Eintrittsquerschnitt in die Schürze unterhalb der Eintrittsöffnung des Verbindungsstücks am größten ist, wobei der gesamte zur Verfügung stehende Zwischenraum zwischen dem Senkhammer und der Bohrlochwandung ausgenützt werden kann. Dadurch können auch verhältnismäßig große Stücke des Bohrkleins ohne Schwierigkeiten weggefördert werden.This object is achieved with the characterizing features of claim 1. It is thereby achieved that the entry cross section into the apron is greatest below the entry opening of the connecting piece, whereby the entire available space between the sink hammer and the borehole wall can be used. As a result, even relatively large pieces of cuttings can be transported away without difficulty.
Die Verwendung eines an sich bekannten Zweiwege-Bohrrohrs ermöglicht es, den zentrischen Förderkanal des Bohrrohrs zum Abtransport des Bohrkleins mittels der eingebrachten Preßluft zu verwenden. Da der Durchtrittsquerschnitt dieses zentrischen Förderkanals wesentlich geringer ist als der des Ringraums zwischen dem Bohrrohr und der Bohrungswandung wird eine für den Fördervorgang erforderliche ausreichende Strömungsgeschwindigkeit bereits mit einer wesentlich geringeren Preßluftmenge erreicht. Beispielsweise kann die Preßluftmenge und damit auch der Energiebedarf auf die Hälfte gegenüber dem herkömmlichen Verfahren verringert werden. Dadurch wird auch eine wesentliche Schonung der Umwelt erreicht.The use of a two-way drill pipe known per se enables the central conveying channel of the drill pipe for the removal of the cuttings by means of the compressed air introduced to use. Since the passage cross-section of this central conveying channel is significantly smaller than that of the annular space between the drill pipe and the bore wall, a sufficient flow rate required for the conveying process is already achieved with a substantially smaller amount of compressed air. For example, the amount of compressed air and thus also the energy requirement can be reduced by half compared to the conventional method. This also helps to protect the environment.
Die für den Antrieb des Senkhammer-Bohrkopfes erforderliche Preßluft wird innerhalb des Verbindungstückes von dem am Umfang mündenden Luftkanal nach unten zu dem zentrischen Anschlußstück des Senkhammer-Bohrkopfes geleitet. Damit wird erreicht, daß der Senkhammer-Bohrkopf weiterhin zentrisch am Bohrgestänge angebracht ist, was aus Gründen der Krafteinleitung erforderlich ist, und daß die Preßluftzufuhr weiterhin zentrisch am Anschlußstück erfolgt, so daß konstruktive Änderungen am Senkhammer-Bohrkopf nicht erforderlich sind. Deshalb können die herkömmlichen Senkhammer-Bohrköpfe unverändert verwendet werden.The compressed air required to drive the Senkhammer drill head is conducted within the connection piece from the air duct opening at the circumference downward to the central connecting piece of the Senkhammer drill head. This ensures that the Senkhammer drill head is still attached centrally to the drill string, which is necessary for reasons of force application, and that the compressed air supply continues to be centered on the connector, so that design changes to the Senkhammer drill head are not required. Therefore the conventional Senkhammer drill heads can be used unchanged.
Die am Anschlußstück dicht angebrachte, den Antriebsteil des Senkhammer-Bohrkopfes umgebende Schürze ist in erster Linie im Bereich unterhalb der seitlichen Eintrittsöffnung des Verbindungsstücks nach unten geöffnet, um das beim Bohren anfallende Bohrklein unmittelbar oberhalb der Schlagbohrkrone aufzunehmen. Die üblicherweise im Bohrloch anstehende Wassersäule drückt das Bohrklein mit der Preßluft in die unten offene Schürze, von wo es in einem im wesentlichen unbehinderten Strömungskanal in den zentrischen Förderkanal des Bohrrohrs gelangt und nach oben gefördert wird.The apron, which is tightly attached to the connecting piece and surrounds the drive part of the countersink drill head, is primarily open in the area below the lateral inlet opening of the connecting piece, in order to accommodate the drilling cuttings which occur during drilling immediately above the percussion drill bit. The water column, which is usually present in the borehole, presses the cuttings with the compressed air into the apron, which is open at the bottom, from where it reaches the central production channel of the drill pipe in an essentially unobstructed flow channel and is conveyed upwards.
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung ist vorgesehen, daß die Schürze ein mit dem Verbindungsstück verbundenes, nach unten offenes Rohr ist, das gegenüber dem Senkhammer-Bohrkopf zur Seite der Eintrittssöffnung hin exzentrisch versetzt ist.According to a particularly preferred embodiment of the invention, it is provided that the apron is a tube which is connected to the connecting piece and is open at the bottom and which is offset eccentrically with respect to the countersink drill head on the side of the inlet opening.
Gemäß einer weiteren vorteilhaften Ausgestaltung des Erfindungsgedankens ist vorgesehen, daß das Bohrrohr gegenüber der Bohrlochöffnung abgedichtet ist und der Zwischenraum zwischen dem Bohrrohr und der Bohrlochöffnung an eine Zufuhrleitung für Preßluft und/oder Wasser angeschlossen ist. Auf diese Weise ist es möglich, in dem das Bohrrohr umgebenden Ringraum einen erhöhten Druck aufrechtzuerhalten, der das Einströmen des mit Wasser und Preßluft vermischten Bohrkleins in die Schürze sowie den Fördervorgang unterstützt. Die Zufuhr von Wasser in den abgedichteten Zwischenraum kann besonders zu Anfang eines Bohrvorgangs zweckmäßig sein, wenn im Bohrloch noch kein Grundwasser ansteht.According to a further advantageous embodiment of the inventive concept, it is provided that the drill pipe is sealed off from the borehole opening and the space between the drill pipe and the borehole opening is connected to a supply line for compressed air and / or water. In this way it is possible to maintain an increased pressure in the annular space surrounding the drill pipe, which supports the inflow of the cuttings mixed with water and compressed air into the apron and the conveying process. The supply of water into the sealed intermediate space can be particularly useful at the beginning of a drilling process when there is no groundwater in the borehole.
Weitere vorteilhafte Ausgestaltungen des Erfindungsgedankens sind Gegenstand weiterer Unteransprüche.Further advantageous embodiments of the inventive concept are the subject of further dependent claims.
Nachfolgend werden Ausführungsbeispiele der Erfindung näher erläutert, die in der Zeichnung dargestellt sind. Es zeigt:
- Fig. 1 einen Längsschnitt durch einen Senkhammer-Bohrkopf am unteren Ende eines Bohrgestänges und
- Fig. 2 einen Längsschnitt durch einen in einem Bohrloch angeordneten Senkhammer-Bohrkopf mit Bohrgestänge.
- Fig. 1 shows a longitudinal section through a countersink drill head at the lower end of a drill pipe and
- Fig. 2 shows a longitudinal section through a countersink drill head arranged in a borehole with drill pipe.
Das bei den dargestellten Ausführungsbeispielen verwendete, von einem (nicht dargestellten) Bohrgerät getragene Bohrgestänge 1, besteht aus einem Bohrrohr 2 mit einem zentrischen Förderkanal 3 und einem an dessen Umfang angeordneten Luftkanal 4 und wird deshalb auch als Zweiwege-Bohrgestänge bezeichnet.The drill pipe 1 used in the illustrated exemplary embodiments and carried by a drilling device (not shown) consists of a
Am unteren Ende des Bohrrohrs 2 ist ein Verbindungsstück 5 angebracht, vorzugsweise angeschweißt. In das Verbindungsstück 5 ist von unten ein herkömmlicher Senkhammer-Bohrkopf 6 mit seinem zentrischen Anschlußstück 7 eingeschraubt, das eine Preßluft-Zufuhröffnung 8 aufweist, durch die der Senkhammer-Bohrkopf 6 zum Antrieb seiner Schlagbohrkrone 9 mit Preßluft versorgt wird. Der Durchmesser der Schlagbohrkrone 9 ist größer als der des Bohrrohrs 2 und auch größer als der Durchmesser des Antriebsteils des Senkhammer-Bohrkopfes 6.At the lower end of the
Im Verbindungsstück 5 verläuft ein Förderkanalabschnitt 10 vom zentrischen Förderkanal 3 des Bohrrohrs 2 schräg nach unten zu einer seitlichen Eintrittsöffnung 11.In the connecting
Der Luftkanal 4 des Bohrrohrs 2 mündet in einer die obere Öffnung des Förderkanalabschnitts 10 konzentrisch umgebenden stirnseitigen Nut 12 des Verbindungsstücks 5. Von einer Umfangsstelle dieser als ringförmiger Sammelkanal wirkenden Nut 12 verläuft ein Luftkanalabschnitt 13 schräg nach unten zum zentrischen Anschlußstück 7 des Bohrkopfs 6. Wie man aus der Zeichnung erkennt, verläuft der Luftkanalabschnitt 13 angenähert parallel zum Förderkanalabschnitt 10.The air channel 4 of the
Am Verbindungsstück 5 ist eine nach unten offene Schürze 14 angebracht. Diese Schürze 14 wird von einem nach unten offenen Rohr gebildet, das am Verbindungsstück 5 angeschraubt ist und gegenüber dem Senkhammer-Bohrkopf 6 zur Seite der Eintrittsöffnung 11 hin exzentrisch versetzt ist. Dadurch wird auf der Seite dieser Eintrittsöffnung 11 in geringem Abstand oberhalb der Schlagbohrkrone 9 eine Einströmöffnung 15 gebildet, die über den Förderkanalabschnitt 10 mit dem Förderkanal 3 im Bohrrohr 2 verbunden ist.A downwardly
Wie in Fig. 2 mit Pfeilen angedeutet ist, strömt die Preßluft durch den Luftkanalabschnitt 13 und die Preßluftzufuhröffnung 8 des zentrischen Anschlußstücks 7 in den Senkhammer-Bohrkopf 6 und treibt die Schlagbohrkrone 9 zu Schlagbewegungen an. Zugleich wird das gesamte Bohrgestänge 1 mit dem daran hängenden Senkhammer-Bohrkopf 6 durch das tragende Bohrgerät gedreht.As indicated in Fig. 2 with arrows, the compressed air flows through the
Die Preßluft tritt durch in der Zeichnung gestrichelt angedeuteter Luftkanäle 16 nach unten aus der Schlagbohrkrone 9 aus und nimmt das anfallende Bohrklein im wassergefüllten Bohrloch in die Öffnung 15 der Schürze 14 mit. Durch das in der Schürze 14, dem Förderkanalabschnitt 10 und dem Förderkanal 3 nach oben strömende Wasser-Luft-Gemisch wird das Bohrklein mitgerissen und nach oben transportiert.The compressed air emerges downward from the
In Fig. 2 ist angedeutet, daß das Bohrrohr 2 gegenüber der Bohrlochöffnung abgedichtet ist. Hierzu ist die Bohrlochöffnung mit einem Futterrohr 17 ausgekleidet, das über eine Gleitdichtung 18 gegenüber dem Bohrrohr 2 beweglich abgedichtet ist.In Fig. 2 it is indicated that the
In den Zwischenraum 19 zwischen dem Bohrrohr 2 und der Bohrlochöffnung mündet eine in Fig. 2 nur schematisch angedeutete Zufuhrleitung 20 für Preßluft und/oder Wasser. Dadurch kann in diesem Zwischenraum 19 ein Druck aufrechterhalten werden, der die Förderung des Bohrkleins in die Schürze 14 hinein unterstützt. Wenn im Anfangsabschnitt einer Bohrung noch kein Wasser im Bohrloch ansteht, kann über die Leitung 20 Wasser zugeführt werden, das für den Transport des Bohrkleins durch Heberwirkung mittels der Preßluft erforderlich ist.A
Da der Leitungsquerschnitt des Förderkanals über die gesamte Länge der Bohrung gleichmäßig klein ist, kann eine ausreichend hohe Fördergeschwindigkeit bereits mit der Preßluftmenge aufrechterhalten werden, die für den Schlagantrieb des Senkhammer-Bohrkopfes 6 erforderlich ist. Es besteht keine Notwendigkeit, unter zusätzlichem Energieaufwand eine zusätzliche Preßluftmenge zuzuführen, die ausschließlich der Förderung des Bohrkleins dient.Since the line cross-section of the conveying channel is uniformly small over the entire length of the bore, a sufficiently high conveying speed can already be maintained with the amount of compressed air that is required for the percussion drive of the sinking
Da eine ausreichende Förderwirkung für das Bohrklein unter allen Betriebsbedingungen aufrechterhalten wird, bleibt die Bohrsohle sauber, weil kein in der Schwebe befindliches Bohrklein nach unten fallen kann. Dadurch wird die Bohrwirkung der Schlagbohrkrone 9 verbessert.As sufficient drilling fluid support is maintained under all operating conditions, the bottom of the drill remains clean because no suspended cuttings can fall down. The drilling effect of the
Claims (6)
- Drilling device comprising a drilling column (1) and a percussive drill head (6) with an air duct (4) which extends to the percussive drill head (6), which at its lower end has a percussion drilling crown (9) and at its upper end a central connector (7) with a compressed air feed opening (8), where the drilling column (1) comprises a drill pipe (2) with a central discharge channel (3), around the circumference of which is located the air duct (4), where a coupling piece (5) is fitted between the lower end of the drill pipe (2) and the connector (7) of the percussive drill head (6), said connector having a discharge channel section (10) running from the central discharge channel (3) of the drill pipe (2) to a lateral inlet port (11) and at least one air duct section (13) running from the air duct (4) of the drill pipe (2) to the central connector (7) of the percussive drill head (6), and where a skirt (14) which is open downwards is located in the area of the lateral inlet port (11) of the coupling piece (5), characterised in that the skirt (14) is eccentrically offset with respect to the percussive drill head (6) towards the side ofthe single inlet port (11).
- Drilling device according to claim 1, characterised in that the single discharge channel section (10) in the coupling piece (5) runs from the central discharge channel (3) of the drill pipe (2) diagonally downwards towards the side inlet port (11).
- Drilling device according to claim 2, characterised in that the air duct section (13) in the coupling piece (5) runs approximately parallel to the discharge channel section (10).
- Drilling device according to claim 1, characterised in that the skirt (14) is a pipe opening downwards, connected to the coupling piece (5), said pipe being eccentrically offset in relation to the percussive drill head (6) towards the side of the inlet port (11).
- Drilling device according to claim 1, characterised in that the drill pipe (2) is sealed off from the drill hole opening and the gap (19) between the drill pipe (2) and the drill hole opening is connected to a feed line (20) for compressed air and/or water.
- Drilling device according to claim 5, characterised in that the drill hole opening is lined with a chuck pipe (17) which is sealed off from the drill pipe (2) by rotating sliding packing (18).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4310726 | 1993-04-02 | ||
DE4310726A DE4310726A1 (en) | 1993-04-02 | 1993-04-02 | Drill pipe with countersunk hammer drill head |
PCT/EP1994/000887 WO1994023175A1 (en) | 1993-04-02 | 1994-03-22 | Drilling column with sledgehammer drilling head |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0690953A1 EP0690953A1 (en) | 1996-01-10 |
EP0690953B1 true EP0690953B1 (en) | 1997-10-15 |
Family
ID=6484496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94912494A Expired - Lifetime EP0690953B1 (en) | 1993-04-02 | 1994-03-22 | Drilling apparatus with drill string and percussion hammer drilling head |
Country Status (6)
Country | Link |
---|---|
US (1) | US5590725A (en) |
EP (1) | EP0690953B1 (en) |
AT (1) | ATE159320T1 (en) |
DE (2) | DE4310726A1 (en) |
ES (1) | ES2110229T3 (en) |
WO (1) | WO1994023175A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005061843A1 (en) | 2003-12-22 | 2005-07-07 | Blickhan, Elisabeth, Charlotte | Drilling device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE502005001190D1 (en) * | 2005-06-10 | 2007-09-20 | Geomechanik Wasser Und Umweltt | Countersink drilling device and method |
DE202005012722U1 (en) * | 2005-06-10 | 2005-10-20 | 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 |
GB2454900B (en) * | 2007-11-22 | 2012-01-11 | Schlumberger Holdings | Self-circulating drill bit |
CN105041246B (en) * | 2015-02-26 | 2018-01-12 | 徐州徐工基础工程机械有限公司 | A kind of reverse circulation down-hole hammer transformational structure |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US3151690A (en) * | 1961-03-17 | 1964-10-06 | Gas Drilling Service Co | Well drilling apparatus |
US3439757A (en) * | 1968-03-12 | 1969-04-22 | Wayland D Elenburg | Drilling apparatus |
US3596720A (en) * | 1969-11-03 | 1971-08-03 | Wayland D Elenburg | Method of forming a borehole using a compressible and noncompressible fluid in a dual pipe string |
US4274497A (en) * | 1977-04-11 | 1981-06-23 | Walker-Neer Manufacturing Co., Inc. | Skirted hammer sub for dual tube drilling |
DE2854461C2 (en) * | 1978-12-16 | 1983-03-10 | Wirth Maschinen- und Bohrgeräte-Fabrik GmbH, 5140 Erkelenz | Countersink hammer |
US4509606A (en) * | 1980-10-29 | 1985-04-09 | Walker-Neer Manufacturing Co., Inc. | Axial return hammer |
US4630691A (en) * | 1983-05-19 | 1986-12-23 | Hooper David W | Annulus bypass peripheral nozzle jet pump pressure differential drilling tool and method for well drilling |
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 |
SE454283B (en) * | 1986-09-02 | 1988-04-18 | Inst Gornogo Dela Sibirskogo O | ANNUAL AIR HAMBLE DEVICE FOR DRILLING |
CA2041000C (en) * | 1990-04-26 | 2005-07-12 | John Elsby | Transmission sleeve for a down hole hammer |
US5209262A (en) * | 1991-01-15 | 1993-05-11 | Carow Walter M | Breakaway hose coupling with integrated swivel mechanism |
-
1993
- 1993-04-02 DE DE4310726A patent/DE4310726A1/en not_active Withdrawn
-
1994
- 1994-03-22 EP EP94912494A patent/EP0690953B1/en not_active Expired - Lifetime
- 1994-03-22 AT AT94912494T patent/ATE159320T1/en not_active IP Right Cessation
- 1994-03-22 WO PCT/EP1994/000887 patent/WO1994023175A1/en active IP Right Grant
- 1994-03-22 ES ES94912494T patent/ES2110229T3/en not_active Expired - Lifetime
- 1994-03-22 US US08/530,176 patent/US5590725A/en not_active Expired - Lifetime
- 1994-03-22 DE DE59404351T patent/DE59404351D1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005061843A1 (en) | 2003-12-22 | 2005-07-07 | Blickhan, Elisabeth, Charlotte | Drilling device |
Also Published As
Publication number | Publication date |
---|---|
ES2110229T3 (en) | 1998-02-01 |
ATE159320T1 (en) | 1997-11-15 |
US5590725A (en) | 1997-01-07 |
DE4310726A1 (en) | 1994-10-06 |
DE59404351D1 (en) | 1997-11-20 |
EP0690953A1 (en) | 1996-01-10 |
WO1994023175A1 (en) | 1994-10-13 |
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