EP0874126A1 - Method and device for drilling by use of simultaneous percussion and rotation - Google Patents
Method and device for drilling by use of simultaneous percussion and rotation Download PDFInfo
- Publication number
- EP0874126A1 EP0874126A1 EP98450005A EP98450005A EP0874126A1 EP 0874126 A1 EP0874126 A1 EP 0874126A1 EP 98450005 A EP98450005 A EP 98450005A EP 98450005 A EP98450005 A EP 98450005A EP 0874126 A1 EP0874126 A1 EP 0874126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drilling
- hammer
- rotation
- crown
- drilling device
- 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.)
- Withdrawn
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009527 percussion Methods 0.000 title claims description 10
- 239000013049 sediment Substances 0.000 description 5
- 210000002445 nipple Anatomy 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B6/00—Drives for drilling with combined rotary and percussive action
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/20—Drives for drilling, used in the borehole combined with surface drive
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
- E21B7/201—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes with helical conveying means
- E21B7/203—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes with helical conveying means using down-hole drives
Definitions
- the subject of the present invention is a method of drilling by simultaneous percussion and rotation, and a setting device work of this process.
- This device has a major drawback: to return to rear, the reamer must return to the axis of the casing, which is not an easy operation in itself, and which can be further complicated by the presence of sediment in the casing. In addition, the fact of moving from an eccentric position to a centered position requires a mowing turn and often causes loosening and we may have difficulty reassemble the entire device.
- This device has the disadvantage, besides being extremely expensive, not to be suitable for horizontal drilling.
- a goal of the present invention is to provide a method which can be used for horizontal drilling, which is inexpensive, and which allows drill variable diameters without having to change the size of the pilot cutter.
- Another object of the invention is to propose a device for setting work of this process, which allows the user to choose the borehole diameter he wishes to make while using a hammer and a standard cutter, simply by fitting on a retractable crown surrounding this hammer wheel interchangeable.
- the subject of the invention is therefore a new drilling method, characterized in that drilling is carried out by application simultaneous percussion and rotation.
- the percussion is applied to the center of the borehole, and the rotation is applied to the periphery of the borehole.
- the invention also relates to a drilling device comprising casing in which a main auger is located in the center of which passes a down the hole hammer at the end which is fixed a pilot cutter operated by the bottom hammer hole, characterized in that said pilot cutter wears a crown on the periphery of which the knobs are secured bore.
- the device includes a return spring for the rollers.
- the spring is housed in the body of the crown and acts on a nipple which is in direct contact with the base wheel.
- the stud is provided with an O-ring.
- the device further includes a hammer guide auger bottom of hole.
- the guide auger and the main auger coincide so as to be an extension of each other.
- Another object of the invention is the use of the method or the device for performing horizontal drilling, including in heterogeneous terrain.
- FIG. 1 is a schematic longitudinal section of the drilling device according to the invention.
- FIG. 2 is a schematic front view of an embodiment of a crown 7.
- FIG. 3 is a horizontal section of another embodiment of a crown 7.
- the drilling process according to the invention is carried out by the application simultaneous percussion and rotation. This is exactly drill in the axis of the casing 4 and carry out simultaneously a lateral bore. The lateral bore widens the hole to a sufficient diameter for the installation of the casing 4.
- This process has the advantage of increasing the possibilities of larger diameter drilling while keeping the same pilot bit 6.
- the percussion is applied to the center of the borehole, and rotation is applied to the periphery of the borehole.
- the drilling device comprises a casing 4, in which there is a auger-extension 1, a downhole hammer 2 guided by an auger-guide 3 and a cutting edge 6 operated by the downhole hammer 2.
- the casing 4, the downhole hammer 2, the augers 1 and 3 and the cutting edge 6 are standard.
- a crown 7 carries on the one hand in its centers the pilot cutter 6, and on the other hand on its periphery the knurls 5.
- the cutting edge 6 operates in percussion, and the bore wheels 5, which are secured on the periphery of the crown 7, operate in rotation.
- the peripheral knobs 5 have the function of boring the hole to a diameter sufficient to allow the installation of the casing.
- the number of knobs 5 is variable: it can be modulated by depending on the terrain. Preferably, an even number of scroll wheels, especially four to eight scroll wheels.
- knobs 5 The size of these knobs 5 is variable. This characteristic is particularly interesting because it allows drill holes considerably enlarged compared to the diameter of the cutting edge 6 used.
- knobs 5 are made of steel, in the form of tri-cones fitted with tungsten carbide spikes.
- the shape of the wheel 5 is adapted to avoid jamming of the sediment up to the wheels.
- the crown shown in Figure 3 in the form of gear wheel, the knobs 5 located on the teeth, allows a much greater release of sediment compared to the crown of circular shape shown in Figure 2.
- the shape tooth reduces the risk of blockage and increases the penetration speed in medium hard terrain.
- the device therefore comprises at least one spring 8 located in the crown 7 and making each wheel retractable in the casing 4.
- the device comprises a spring by thumb wheel 5.
- the knobs 5 are housed between the hammer and auger propeller 3.
- the method and the device according to the invention are particularly studied and advantageous to carry out horizontal drilling, including included in heterogeneous terrains, and in particular drilling horizontal cased in hard rock, pebbles, moraines, embankments.
Abstract
Description
La présente invention a pour objet un procédé de forage par percussion et rotation simultanées, et un dispositif de mise en oeuvre de ce procédé.The subject of the present invention is a method of drilling by simultaneous percussion and rotation, and a setting device work of this process.
Différentes techniques de forage sont actuellement utilisées : les méthodes classiques de perforation des terrains consistent à forer de gros diamètres à l'aide d'un marteau de fond de trou, terminé par un taillant, à injecter de la boue et à placer un tubage en fin d'opération. Les marteaux classiques sont à percussion uniquement (il n'y a pas de rotation), et doivent utiliser des taillants dont la taille est en fonction du diamètre du tubage à insérer dans le trou de forage. Par exemple, pour installer un tubage de 219 mm, il est nécessaire d'utiliser un taillant de 254 mm.Different drilling techniques are currently used: conventional methods of perforating land involve drilling large diameters using a down the hole hammer by a cutter, injecting mud and placing a casing at the end of operation. Classic hammers are percussion only (there is no rotation), and must use cutters whose size is based on the diameter of the tubing to be inserted into the hole drilling. For example, to install 219 mm tubing, it is necessary to use a 254 mm cutter.
Il existe également un dispositif, commercialisé par la société suédoise SANDVIC COROMANT sous la marque ODEX, qui présente un marteau fond de trou, sur lequel est monté un aléseur et le taillant-pilote. La perforation fond de trou s'effectue de manière conventionnelle, à l'aide du taillant : la rotation, effectuée en tête, est transmise par les allonges tubulaires, à l'aléseur. Lorsque la rotation commence, l'aléseur est poussé vers l'extérieur : l'aléseur agit en fait comme une hélice excentrée montée sur un came.There is also a device, marketed by the company Swedish SANDVIC COROMANT under the brand ODEX, which has a down the hole hammer, on which is mounted a reamer and the cutting edge. The hole in the hole is perforated conventional, using the cutting edge: the rotation, performed at the head, is transmitted by the tubular extensions to the reamer. When the rotation begins, the reamer is pushed outwards: the reamer in fact acts like an eccentric propeller mounted on a cam.
Ce dispositif présente un inconvénient majeur : pour revenir en arrière, il est nécessaire que l'aléseur se remette dans l'axe du tubage, ce qui n'est pas une opération facile en soit, et qui peut être encore compliquée par la présence de sédiments dans le tubage. Par ailleurs, le fait de passer d'une position excentrée à une position centrée oblige à effectuer un tournant à fauche et provoque souvent des dévissages et on peut avoir des difficultés à faire remonter l'ensemble du dispositif.This device has a major drawback: to return to rear, the reamer must return to the axis of the casing, which is not an easy operation in itself, and which can be further complicated by the presence of sediment in the casing. In addition, the fact of moving from an eccentric position to a centered position requires a mowing turn and often causes loosening and we may have difficulty reassemble the entire device.
Ce dispositif présente l'inconvénient, outre d'être extrêment coûteux, de ne pas être adapté à des forages horizontaux.This device has the disadvantage, besides being extremely expensive, not to be suitable for horizontal drilling.
Pour notamment remédier à ces inconvénients, un but de la présente invention est de proposer un procédé qui peut être utilisé pour les forages horizontaux, qui est peu coûteux, et qui permet d'effectuer des forages de diamètres variables sans avoir à modifier la dimension du taillant pilote. To remedy these drawbacks in particular, a goal of the present invention is to provide a method which can be used for horizontal drilling, which is inexpensive, and which allows drill variable diameters without having to change the size of the pilot cutter.
Un autre but de l'invention est de proposer un dispositif de mise en oeuvre de ce procédé, qui permette à l'utilisateur de choisir le diamètre trou de forage qu'il souhaite effectuer tout en utilisant un marteau et un taillant standarts, simplement en adaptant sur une couronne rétractable entourant ce marteau des molettes interchangeables.Another object of the invention is to propose a device for setting work of this process, which allows the user to choose the borehole diameter he wishes to make while using a hammer and a standard cutter, simply by fitting on a retractable crown surrounding this hammer wheel interchangeable.
L'invention a donc pour objet un nouveau procédé de forage, caractérisé en ce que le forage est effectué par l'application simultanée d'une percussion et d'une rotation.The subject of the invention is therefore a new drilling method, characterized in that drilling is carried out by application simultaneous percussion and rotation.
Suivant un mode de réalisation préféré de l'invention, la percussion est appliquée au centre du trou de forage, et la rotation est appliquée à la périphérie du trou de forage.According to a preferred embodiment of the invention, the percussion is applied to the center of the borehole, and the rotation is applied to the periphery of the borehole.
L'invention a également pour objet un dispositif de forage comprenant un tubage dans lequel est situé une tarière principale au centre de laquelle passe un marteau fond de trou à l'extrémité duquel est fixé un taillant pilote actionné par le marteau fond de trou, caractérisé en ce que ledit taillant-pilote porte une couronne sur la périphérie de laquelle sont solidarisées des molettes d'alésage.The invention also relates to a drilling device comprising casing in which a main auger is located in the center of which passes a down the hole hammer at the end which is fixed a pilot cutter operated by the bottom hammer hole, characterized in that said pilot cutter wears a crown on the periphery of which the knobs are secured bore.
Suivant un mode de réalisation préféré de l'invention, le dispositif comprend un ressort de rappel des molettes.According to a preferred embodiment of the invention, the device includes a return spring for the rollers.
De préférence, le ressort est logé dans le corps même de la couronne et agit sur un téton qui est en contact direct avec la base de la molette.Preferably, the spring is housed in the body of the crown and acts on a nipple which is in direct contact with the base wheel.
Avantageusement, le téton est muni d'un joint torique.Advantageously, the stud is provided with an O-ring.
Suivant un mode de réalisation particulier de l'invention, le dispositif comprend en outre une tarière de guidage du marteau fond de trou.According to a particular embodiment of the invention, the device further includes a hammer guide auger bottom of hole.
De préférence, la tarière de guidage et la tarière principale coïncident de manière à être dans le prolongement l'une de l'autre. Preferably, the guide auger and the main auger coincide so as to be an extension of each other.
Un autre objet de l'invention est l'utilisation du procédé ou du dispositif pour effectuer des forages horizontaux, y compris dans des terrains hétérogènes.Another object of the invention is the use of the method or the device for performing horizontal drilling, including in heterogeneous terrain.
La description détaillée qui suit se réfère aux trois figures jointes qui illustrent non limitativement l'invention.The following detailed description refers to the three figures which illustrate, without limitation, the invention.
La figure 1 est une coupe longitudinale schématique du dispositif
de forage selon l'invention.
La figure 2 est une vue de face schématique d'un mode de
réalisation d'une couronne 7.
La figure 3 est une coupe horizontale d'un autre mode de
réalisation d'une couronne 7.Figure 1 is a schematic longitudinal section of the drilling device according to the invention.
FIG. 2 is a schematic front view of an embodiment of a
FIG. 3 is a horizontal section of another embodiment of a
Le procédé de forage selon l'invention est effectué par l'application
simultanée d'une percussion et d'une rotation. Il s'agit exactement
d'effectuer un forage dans l'axe du tubage 4 et de réaliser
simultanément un alésage latéral. L'alésage latéral élargit le trou à
un diamètre suffisant pour la mise en place du tubage 4.The drilling process according to the invention is carried out by the application
simultaneous percussion and rotation. This is exactly
drill in the axis of the
Ce procédé présente l'avantage d'augmenter les possibilités de forage en plus gros diamètre tout conservant le même taillant-pilote 6.This process has the advantage of increasing the possibilities of larger diameter drilling while keeping the same pilot bit 6.
Selon le procédé de forage selon l'invention, la percussion est appliquée au centre du trou de forage, et la rotation est appliquée à la périphérie du trou de forage.According to the drilling method according to the invention, the percussion is applied to the center of the borehole, and rotation is applied to the periphery of the borehole.
Par ailleurs, selon le procédé de l'invention, il est possible de revenir en arrière à tout moment, pendant le forage ou bien entendu à la fin du forage.Furthermore, according to the method of the invention, it is possible to go back at any time, during drilling or of course at the end of drilling.
Le dispositif de forage comprend un tubage 4, dans lequel il y a une
tarière-rallonge 1, un marteau fond de trou 2 guidé par une tarière-guide
3 et un taillant-pilote 6 actionné par le marteau fond de trou
2. Le tubage 4, le marteau fond de trou 2, les tarières 1 et 3 et le
taillant-pilote 6 sont standarts.The drilling device comprises a
La tarière de guidage et la tarière principale coïncident de manière à être dans le prolongement l'une de l'autre. Ces deux tarières forment ce qu'on appelle un train de tarières, qui va servir à optimiser l'évacuation des gravats. Guide auger and main auger coincide to be an extension of each other. These two augers form what is called an auger train, which will be used to optimize the evacuation of rubble.
A l'extrémité du marteau 2, une couronne 7 porte d'une part en son
centre le taillant-pilote 6, et d'autre part sur sa périphérie les
molettes 5. Le taillant-pilote 6 fonctionne en percussion, et les
molettes d'alésage 5, qui sont solidarisées sur la périphérie de la
couronne 7, fonctionnent en rotation. Les molettes périphériques 5
ont pour fonction d'aléser le trou à un diamètre suffisant pour
permettre la mise en place du tubage.At the end of the
Le nombre des molettes 5 est variable : il peut être modulé en
fonction du terrain. De préférence, on utilise un nombre pair de
molettes, notamment de quatre à huit molettes.The number of
La taille de ces molettes 5 est variable. Cette caractéristique est
particulièrement intéressante, car elle permet d'effectuer des
trous de forage considérablement élargis par rapport au diamètre
du taillant-pilote 6 utilisé.The size of these
De préférence, les molettes 5 sont en acier, en forme de tri-cônes
muni de piques en carbure de tungstène.Preferably, the
La forme de la molette 5 est adaptée pour éviter le bourrage des
sédiments à hauteur des molettes.The shape of the
Par exemple, la couronne représentée sur la figure 3 en forme de
roue dentée, les molettes 5 se trouvant sur les dents, permet un
dégagement beaucoup plus important des sédiments par rapport à la
couronne de forme circulaire représentée sur la figure 2. La forme
dentée diminue le risque de bourrage et permet d'augmenter la
vitesse de pénétration dans les terrains de dureté moyenne.For example, the crown shown in Figure 3 in the form of
gear wheel, the
Une des difficultés rencontrées dans la réalisation de l'invention
était de trouver un système permettant l'articulation des molettes
(position forage - position retrait) sans que les sédiments puissent
bloquer le ressort de maintien. Cette difficulté a été résolue par la
position particulière d'au moins un ressort de rappel 8, qui est fixé
d'une part à la couronne, et agit en traction sur la molette 5 . Le
ressort 8, au lieu d'être extérieur, est logé dans le corps même de
la couronne 7. Il agit sur un téton (non représenté) qui est en
contact direct avec la base de la molette 5. Le téton est muni d'un
joint, de préférence torique, qui empêche les sédiments de pénétrer
dans le ressort 8, ce qui élimine tout risque de blocage. De plus, le
ressort 8 est muni d'un chapeau de blocage (non représenté). One of the difficulties encountered in carrying out the invention
was to find a system to articulate the knobs
(drilling position - withdrawal position) without sediment being able to
lock the retaining spring. This difficulty was resolved by the
particular position of at least one
Le dispositif comprend donc au moins un ressort 8 situé dans la
couronne 7 et rendant rétractable chaque molette dans le tubage 4.
De préférence, le dispositif comprend un ressort par molette 5.
En position rétractée, les molettes 5 viennent se loger entre le
marteau et l'hélice de la tarière 3.The device therefore comprises at least one
Le procédé et le dispositif selon l'invention sont particulièrement étudiés et avantageux pour effectuer des forages horizontaux, y compris dans des terrains hétérogènes, et notamment des forages horizontaux tubés dans la roche dure, les galets, les moraines, les remblais.The method and the device according to the invention are particularly studied and advantageous to carry out horizontal drilling, including included in heterogeneous terrains, and in particular drilling horizontal cased in hard rock, pebbles, moraines, embankments.
Les avantages du procédé et du dispostif selon l'invention sont nombreux : ils permettent d'opérer en situation de "trou borgne", avec une fouille de réception réduite, de revenir en arrière sans difficulté en cours de forage et d'effectuer une économie d'air importante.The advantages of the process and of the device according to the invention are numerous: they make it possible to operate in a "blind hole" situation, with a reduced reception search, to go back without difficulty during drilling and saving air important.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9706488 | 1997-04-19 | ||
| FR9706488A FR2762355B1 (en) | 1997-04-19 | 1997-04-19 | SIMULTANEOUS PERCUSSION AND ROTATION DRILLING METHOD AND DEVICE FOR CARRYING OUT SAID METHOD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0874126A1 true EP0874126A1 (en) | 1998-10-28 |
Family
ID=9507292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98450005A Withdrawn EP0874126A1 (en) | 1997-04-19 | 1998-04-16 | Method and device for drilling by use of simultaneous percussion and rotation |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0874126A1 (en) |
| FR (1) | FR2762355B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003025327A1 (en) * | 2001-09-20 | 2003-03-27 | Shell Internationale Research Maatschappij B.V. | Percussion drilling head |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199208B (en) * | 2022-09-13 | 2022-12-09 | 陕西清腾畅建筑工程有限公司 | Road side slope drilling equipment |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2915288A (en) * | 1954-10-26 | 1959-12-01 | Crapez Leon Edmond | Methods of and apparatus for boring wells, drifts and the like |
| US3126065A (en) * | 1964-03-24 | Chadderdon | ||
| US3391751A (en) * | 1967-06-26 | 1968-07-09 | Michael R. Caro | Drilling apparatus |
| DE2924393A1 (en) * | 1979-06-16 | 1980-12-18 | Brueckner Grundbau Gmbh | Overlay borehole drilling rig - has independent rotary drives for inner and outer tubes on feed assembly |
| US4458761A (en) * | 1982-09-09 | 1984-07-10 | Smith International, Inc. | Underreamer with adjustable arm extension |
| GB2186611A (en) * | 1986-02-18 | 1987-08-19 | Gewerk Eisenhuette Westfalia | Pipe-driving apparatus |
| DE3819567A1 (en) * | 1988-06-09 | 1989-12-14 | Gewerk Eisenhuette Westfalia | Working head for pipe jacking operation, in particular with removal of the excavated material by means of a transport container |
| GB2254092A (en) * | 1991-03-26 | 1992-09-30 | Westfalia Becorit Ind Tech | Apparatus for and process of laying of pipelines in the ground |
| US5386878A (en) * | 1994-04-29 | 1995-02-07 | Uti Energy Corp. | Rock boring process and apparatus |
| WO1996004456A1 (en) * | 1994-08-03 | 1996-02-15 | Ilomaeki Valto | A drilling apparatus |
-
1997
- 1997-04-19 FR FR9706488A patent/FR2762355B1/en not_active Expired - Fee Related
-
1998
- 1998-04-16 EP EP98450005A patent/EP0874126A1/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3126065A (en) * | 1964-03-24 | Chadderdon | ||
| US2915288A (en) * | 1954-10-26 | 1959-12-01 | Crapez Leon Edmond | Methods of and apparatus for boring wells, drifts and the like |
| US3391751A (en) * | 1967-06-26 | 1968-07-09 | Michael R. Caro | Drilling apparatus |
| DE2924393A1 (en) * | 1979-06-16 | 1980-12-18 | Brueckner Grundbau Gmbh | Overlay borehole drilling rig - has independent rotary drives for inner and outer tubes on feed assembly |
| US4458761A (en) * | 1982-09-09 | 1984-07-10 | Smith International, Inc. | Underreamer with adjustable arm extension |
| GB2186611A (en) * | 1986-02-18 | 1987-08-19 | Gewerk Eisenhuette Westfalia | Pipe-driving apparatus |
| DE3819567A1 (en) * | 1988-06-09 | 1989-12-14 | Gewerk Eisenhuette Westfalia | Working head for pipe jacking operation, in particular with removal of the excavated material by means of a transport container |
| GB2254092A (en) * | 1991-03-26 | 1992-09-30 | Westfalia Becorit Ind Tech | Apparatus for and process of laying of pipelines in the ground |
| US5386878A (en) * | 1994-04-29 | 1995-02-07 | Uti Energy Corp. | Rock boring process and apparatus |
| WO1996004456A1 (en) * | 1994-08-03 | 1996-02-15 | Ilomaeki Valto | A drilling apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003025327A1 (en) * | 2001-09-20 | 2003-03-27 | Shell Internationale Research Maatschappij B.V. | Percussion drilling head |
| GB2396878A (en) * | 2001-09-20 | 2004-07-07 | Shell Int Research | Percussion drilling head |
| GB2396878B (en) * | 2001-09-20 | 2005-10-19 | Shell Int Research | Percussion drilling head |
| US7104344B2 (en) | 2001-09-20 | 2006-09-12 | Shell Oil Company | Percussion drilling head |
| CN1318723C (en) * | 2001-09-20 | 2007-05-30 | 国际壳牌研究有限公司 | Percussion drilling head |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2762355A1 (en) | 1998-10-23 |
| FR2762355B1 (en) | 1999-11-05 |
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