EP0095134B1 - Procédé et dispositif pour la réalisation de forages - Google Patents

Procédé et dispositif pour la réalisation de forages Download PDF

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Publication number
EP0095134B1
EP0095134B1 EP83104876A EP83104876A EP0095134B1 EP 0095134 B1 EP0095134 B1 EP 0095134B1 EP 83104876 A EP83104876 A EP 83104876A EP 83104876 A EP83104876 A EP 83104876A EP 0095134 B1 EP0095134 B1 EP 0095134B1
Authority
EP
European Patent Office
Prior art keywords
bore
head
diameter
clamping elements
bore head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83104876A
Other languages
German (de)
English (en)
Other versions
EP0095134A3 (en
EP0095134A2 (fr
Inventor
Georg Hurtz
Heinz-Peter Vogts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mhwirth GmbH
Original Assignee
Wirth Maschinen und Bohrgeraete Fabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wirth Maschinen und Bohrgeraete Fabrik GmbH filed Critical Wirth Maschinen und Bohrgeraete Fabrik GmbH
Publication of EP0095134A2 publication Critical patent/EP0095134A2/fr
Publication of EP0095134A3 publication Critical patent/EP0095134A3/de
Application granted granted Critical
Publication of EP0095134B1 publication Critical patent/EP0095134B1/fr
Expired legal-status Critical Current

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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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/062—Deflecting the direction of boreholes the tool shaft rotating inside a non-rotating guide travelling with the shaft
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
    • 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
    • E21B7/04—Directional drilling
    • E21B7/10—Correction of deflected boreholes
    • 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
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • 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
    • E21B10/345—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 cutter shifted by fluid pressure

Definitions

  • the invention relates to a method for drilling substantially vertical bores, in particular large-bore bores, shafts or the like, whereby for a drill head which can be rotated by means of a drill rod or the like Facility is specified. (U.S.-A-2,637,527).
  • the object of the invention is to provide an advantageous method for producing substantially vertically directed bores of the type specified at the outset, with which relatively large boreholes, in particular also over about 1.5 to 2 m, with good verticality when working with rotating drill rods let down.
  • the invention is intended to provide an advantageous device for drilling a hole with good verticality.
  • the invention provides in a method of the type mentioned that the fixable on the borehole wall device is solved, the drill head is brought in a stationary state in a hanging position on the drill string and then the direction for the next drill section is determined, whereby the diameter of the drill head is changed from a relatively larger to a relatively smaller value to determine the direction for the next drilling section.
  • each of these is drilled with the relatively larger diameter of the drill head.
  • the diameter of the drill head that is reduced to determine the direction for the second drill section is then increased again before or at the start of this second drill section.
  • each of them is drilled with the relatively smaller diameter of the drill head and the diameter of the drill head is only increased between the two drill sections and with this diameter at least one approximately corresponding to the drill head height Length is drilled, that afterwards the diameter of the drill head is reduced again, then in the suspended state of the drill head the direction is determined for further drilling and then the next drilling section is drilled.
  • the drilling of the limited length section with the larger diameter advantageously takes place within the drilling section preceding the new direction specification, i. H. within the corresponding stroke of the drill head movement relative to the tensioning device.
  • Drilling with the larger diameter can be done in the downward direction.
  • drilling section is not only to be understood as meaning that the full stroke of the drill head is used relative to the device that can be fixed to the borehole wall, but also a section that can only make up part of this stroke.
  • An advantageous device for drilling substantially vertical bores which is particularly suitable for carrying out the described method, is known is characterized according to the invention in that the drill head has at least one tool which can be moved from an external working position to a further internal position and vice versa, by adjusting the working diameter of the drilling head can be reduced and enlarged.
  • the range of such movement of one or more tools or groups of tools can e.g. B. given a certain drilling stroke, also in the sense that the movable tools can only take two positions, namely an outer and an inner.
  • the design can also be made so that the tools are adjustable in intermediate positions between the end positions.
  • the drill head can be designed in various ways, in particular also in the manner of an extension drill, undercutter or the like.
  • the tool which can be moved in and out from the outside and vice versa, can be pivotably and / or displaceably arranged on a drill head or base body. Accordingly, several tools can be moved together in groups in the specified manner.
  • the invention provides in particular hydraulic actuation devices, namely piston-cylinder units.
  • the design is advantageously made such that the piston-cylinder units for the clamping pieces and the hydraulic actuating devices for the movable tools on the drill head, on the one hand, in the sense an outward movement of the clamping pieces and the tools can be acted upon separately with pressure medium and on the other hand can be acted upon together with pressure medium in the sense of an inward movement of the clamping pieces and the tools.
  • hydraulic oil water can also be used as the pressure medium.
  • a pressure medium supply line for the actuating devices of the movable tools can be guided through the drill string or formed by it.
  • the piston-cylinder units for the clamping pieces are advantageously assigned unlockable check valves or other suitable hydraulic locking blocks or the like, which results in a simple system.
  • the device are on the clamping pieces or on parts movable with these, for. B. piston rods, brackets or the like.
  • Action elements are provided, can be actuated indirectly or directly by the control elements to influence the outward movement of the clamping pieces.
  • the adjustment process of the clamping pieces against the borehole wall can be made particularly inexpensive, in particular also with regard to the uniformity of the last part of the adjustment or the pressing against the borehole wall.
  • the acting members can be parts of different types, including limit switches or the like.
  • movable sensing elements are provided on the clamping pieces or on parts connected to them for simultaneous movement, which protrude outwards over the clamping pieces in the idle state, so that they protrude the latter come into contact with the borehole wall and can then be pushed back by a certain amount.
  • the drive system for moving the clamping pieces namely a hydraulic system, is advantageously designed with appropriate control elements in such a way that all clamping pieces first come into a position in which the sensing elements have come into contact with the borehole wall and only then a last relatively small one of all clamping pieces Distance is traveled through which the clamping pieces are pressed against the borehole wall at the same time.
  • the previous routes may vary depending on the local situation.
  • the desired sequence can be achieved with the aid of valves, in particular different pressure stages being switched in succession.
  • the numeral 1 denotes a drilling tool in the form of a drilling head, the base body 2 of which is provided with roller chisels, cutting rollers 3 or the like which are only indicated schematically at individual points.
  • the drill head 1 has at least one in this embodiment as a caliber tool to be addressed cutting roller 4, the support formed as a two-armed lever 5 is pivotally mounted on a pin 6, such that it protrudes radially by means of an actuating device 7 from an outwardly projecting beyond the contour K of the base body 2 of the drill head 1 (Fig. 1 and 5) in a retracted inner position (Fig. 2 and 6) and vice versa.
  • the cutting roller 4 is in its retracted position even within the outer contour K of the drilling head 1.
  • such cutting rollers 4 can also have their inner position over the contour K of the base body 2 of the Project head 1 without thereby leaving the basic principle of the invention.
  • the desired result can be achieved with various designs of such drill heads and movable tools. 6 shows two tools 4 that can be adjusted in the aforementioned sense. With a drill head with a maximum working diameter of 4.0 m, the diameter reduction is advantageously at least 0.2 m.
  • the actuating device 7 for pivoting the respective cutting roller 4 is in particular a hydraulic piston-cylinder unit (cf. FIG. 6), which is connected in a suitable manner in an articulated manner to the carrier 5 of the cutting roller 4 via a push rod or piston rod 8.
  • a hydraulic piston-cylinder unit cf. FIG. 6
  • the carrier 5 of the cutting roller 4 bears against a stop 9 on the base body 2 of the drill head 1, so that a secure absorption of all stresses is ensured.
  • the drill head 1 is connected to a drive shaft 10, which is connected to a drill rod G, which is drivable in a known manner from a conventional device located above ground and is only indicated by dash-dotted lines in FIG. 1. It can be a screw rod or a flange rod. Both the drill pipe G and the drive shaft 10 are particularly advantageously hollow, so that a drilling process with flushing can be used, in particular according to the principle of the air lifting process.
  • a bracing device In the area of the device which adjoins the drill head backwards, a bracing device, designated overall by the number 11, is arranged. As a guide part, this has a frame-like support body 20, to which four radially directed pressure medium cylinders 12, which are regularly distributed over the circumference, are fastened at two levels E1 and E2 which are at a vertical distance from one another.
  • the retractable and retractable pistons 13 (FIG. 6) with the piston rods 14 carry at their ends clamping pieces 15 in the form of plates, shields or the like, which are held on the piston rods in an angularly movable manner and which are against the wall W of the drill head 1 Drilled hole B can be pressed and then hold the support body 20 firmly in the clamped position.
  • the support body 20 forming the guide part of the tensioning device 11 surrounds a one-part or multi-part load weight, designated overall by the number 30.
  • this consists of a housing 31 which is filled with lead, concrete or another material 32 suitable for weighting. It rests on a foot part 33, on which the bearing 34 of the drill head 1, which is indicated only largely schematically, is located in the axial and radial directions.
  • Corresponding recesses 35 are provided in the load weight 30, which provide the required space for the cylinders when the relative displacement between the drill head 1 and the tensioning device 11 takes place.
  • the loading weight 30 is designed and mounted in such a way that it interacts with the guide part 20 of the tensioning device 11 in such a way that, in the tensioned operating state, the direction of the drill head 1 is correct.
  • guide strips 36 made of suitable material are attached to the housing 31 or a part connected to them, which slide on corresponding guide pieces 37 on the support body 20, as can be seen in particular in FIGS. 3 and 4.
  • All cylinders can be pressurized at the same time, so water or hydraulic fluid, so that the clamping pieces can all be extended together, and also with different ways to the clamping pieces against the borehole wall.
  • a line 21 is provided for supplying pressure medium to the full spaces of the cylinders 12 or for removing medium therefrom, which line is guided, for example, on the outside of the drill pipe and over one another Ring transmitter or rotary distributor 22 with ring channel 23 in lines 24, 25 continues on the non-rotating part (tensioning device 11 and loading weight 30) of the device (only indicated in FIG. 1).
  • An unlockable check valve 26 is assigned to these lines in front of each cylinder 12.
  • the number 48 indicates a torque support for the rotary distributor 22.
  • a further line 41 running along the drill string or formed by it and continuing on the drive shaft 10 leads, with branches, to the full spaces of cylinders 7 serving to adjust movable tools 4.
  • a third line 42 arranged on or formed by the drill string opens out on the one hand into a further annular channel 43 of the rotary distributor 22, which is connected via lines 44, 45 to the annular spaces of the cylinders 12 of the tensioning device 11, and on the other hand sits in one on the drive shaft 10 along line 47 continues, which branches and is connected to the annular spaces of the cylinders 7.
  • a control line 45 branches from lines 44 and 45 to the rear Impact valves 26 to unlock them.
  • the lines 21, 41 and 42 are connected for days to a control device, by means of which pressure medium can optionally be supplied or removed from each line from a source.
  • Fig. 1 the borehole B is shown as vertical. If, after drilling a section, there is a deviation from the vertical V, as indicated in FIG. 2 by the direction of the borehole walls W and a dash-dotted line A, then according to the method according to the invention, when using a device of the type described, how follows.
  • the clamping pieces 15 of the clamping device 11 are retracted by pressure medium supplied via the lines 42, 44, 45, the check valves being unlocked via the lines 46, and the drill head 1 is lifted from the base S of the borehole B by a small amount by means of the drill pipe .
  • the most radially projecting tool 4 or several such tools 4 are pivoted back inward from the external position, so that the overall state according to FIG. 2 results.
  • the drill head 1 then hangs completely freely and unhindered on the drill pipe and can adjust itself exactly vertically under the influence of gravity, because it has no support system on the borehole wall W.
  • the clamping pieces 15 are extended again by means of the piston-cylinder units by supplying pressure medium via the line 21, so that they rest against the borehole wall W, as illustrated in FIG. 5.
  • the pistons 13 in the cylinders 12 and thus the clamping pieces 15 can cover different distances, as required by the different distances after the vertical position of the device has been taken in relation to the inclined borehole wall W.
  • the clamping pieces 15 can adjust themselves accordingly on the piston rods 14 thanks to the articulated attachment.
  • the check valves 26 are in the blocking position.
  • FIG. 7 shows the state achieved in such a procedure before the start of drilling the next drilling section with a newly defined drilling direction, that is to say a state as shown in FIG. 5 for the method of operation explained further above.
  • the previous drilling section with the wall W1 has been drilled with the drilling head 1 with its smaller diameter, i. H. with tools 4 swung in, as is also the state for further drilling according to FIG. 7.
  • the letter D denotes the diameter of the borehole B drilled or to be drilled with such a state of the drill head 1. It is assumed that there is a deviation A from the vertical V which is corrected.
  • the working diameter of the drill head 1 is increased and thus a length L is drilled, which results in an enlarged borehole part BE.
  • This extension BE can already be drilled within the preceding drilling section, taking advantage of the stroke of the drilling head 1 relative to the clamping device 11, in that the tools 4 are pivoted out during this drilling section.
  • FIG. 9 shows a modified embodiment of a hydraulic system for supplying the cylinders 12 of the tensioning device 11, only four cylinders lying in one plane being shown. The diagram with the associated explanation applies accordingly to the cylinders in the second level.
  • the cylinders and their parts are identified by the same numbers as in FIGS. 1 to 6.
  • a facility located above contains a pressure medium, e.g. B. water, from a tank 50 suction pump 53, the delivery line 54 leads to a directional valve 55, the z. B. can be brought into the three 'shown switching positions by hand.
  • the desired maximum pressure can be set at a valve 56 which also forms a safety valve for the pump.
  • Numbers 57 and 58 designate discharge lines leading to tank 50.
  • Two lines 51 and 52 extend from the directional control valve 55 and are connected by a rotor, rotary distributor 59 or the like provided at the upper end of the drill pipe to lines running on or in the drill pipe, which are connected via a rotor, rotary distributor 22 located on the device or the like. Until then, all parts of these lines have been identified with the same numbers.
  • the line 51 leads to a z. B. set to 10 bar preload valve 60, from which it is a line 61 to another, for. B. continues to set to 15 bar bias valve 62.
  • Branching lines 63 lead from this to blocking blocks 66, which are each connected by lines 64 to the full spaces of the cylinders 12.
  • the locking blocks 66 can e.g. B. be designed and switched as the unlockable check valves 26 in the embodiment of FIG. 6 and have the same function as that.
  • the number 65 denotes a hydraulic accumulator that can be charged to 70 bar, for example, and which is connected to the lines 63. This can compensate for leaks and ensures that the clamping pieces are always pressed firmly against the borehole wall while maintaining the high clamping pressure.
  • Control valves 68 are also connected to line 61 via lines 67, which on the other hand are connected to lines 64 via check valves 69.
  • Lines 71 lead from line 51 to switching valves 70, from which lines 72 for the actuation of control valves 68 originate by means of pilot valves assigned to them.
  • the switching valves 70 can be actuated by suitable elements depending on the travel of the piston rods 14 or the clamping pieces 15 or depending on certain positions of the parts mentioned, u. a. also by limit switches or the like.
  • a particularly advantageous embodiment consists in that each clamping piece 15 '(FIG. 10) is provided with at least one sensing element 80 which protrudes somewhat beyond the clamping piece 15' and z. B.
  • Each pushbutton element 80 is connected to an associated switching valve 70 by suitable transmission members 73 in such a way that the switching valve 70 is transferred from the position shown as effective in FIG. 9 to the second position when the pushbutton element 80 moves in when the clamping piece 15 'moves outward It comes into contact with borehole wall B and is thereby pushed back towards the clamping piece.
  • 9 and 10 there is indicated schematically at number 76 an organ influenced by a pushbutton element 80 or the like, which acts in the manner of a limit switch and causes the valve 70 to be switched over via the transmission elements 73.
  • the line 52 branches off and leads to the annular spaces of the cylinders 12.
  • a back pressure valve 74 for. B. a spring-loaded check valve, and parallel to this a simple check valve 75 is provided with reverse flow direction.
  • the back pressure valves 74 are set to a pressure which is favorable in view of the outward movement of the pistons 13, in which the pressure medium is displaced from the annular spaces of the cylinders 12.
  • the directional control valve 55 If the directional control valve 55 is brought into a position in which the pressure medium delivered by the pump 53 flows into the line 51 and pressure medium can flow out of the line 52 via the line 57 to the tank 50, the pistons 13 are pushed out in the cylinders 12 and thus the outward movement of the clamping pieces held by the piston rods 14 and not shown in FIG. 9.
  • the pressure medium flows via the preload valve 60, the line 61, the lines 67, the control valves 68 and the check valves 69 to the full spaces of the cylinders 12. This process continues until the sensing elements 80 come into contact with the borehole wall and thereby the switching valves 70 are operated so that they assume their second position.
  • the directional control valve 55 is brought into a different position, in which pressure medium conveyed by the pump 53 now reaches the line 52, while the line 51 with the lines connected to it now via the Line 57 to the tank 50 is open.
  • the pressure medium flows from the lines 52 via the opening check valves 75 to the annular spaces of the cylinders 12 and pushes back the pistons 13 thereof.
  • the medium displaced from the full spaces of the cylinders 12 flows via the locking blocks 66, which are now opened like the locking blocks 26 according to FIG. 6, and further via lines 63, 61, 51 and 57 back to the tank.
  • the preload valves 60 and 62 are connected or combined with switch valves, not shown, in particular automatic, in such a way that the backflow of the medium is made possible.

Claims (15)

1. Procédé pour réaliser des forages sensiblement verticaux, notamment des forages de grand diamètre, des. puits ou analogues, selon lequel une tête de forage (1) ou analogue, qui peut être entraînée en rotation par un train de tiges de forage (G), reçoit, après la réalisation d'un tronçon de forage, une direction de forage que l'on détermine à l'avance en utilisant un dispositif agencé de façon à pouvoir être fixé contre la paroi (W) du forage, caractérisé en ce qu'on desserre ce dispositif, on amène la tête de forage (1), à l'arrêt, dans une position suspendue sur le train de tiges de forage (G) et on détermine alors la direction du tronçon suivant du forage, en faisant varier le diamètre de la tête de forage (1) d'une valeur relativement grande à une valeur relativement petite en vue de déterminer cette direction du tronçon suivant du forage.
2. Procédé selon la revendication 1, caractérisé en ce que, pour deux tronçons successifs du forage, on fore chacun de ceux-ci avec le diamètre relativement grand de la tête de forage (1), en augmentant, avant de commencer ou en commençant le second tronçon du forage, le diamètre de la tête de forage (1) qui avait été réduit, pour déterminer la direction de ce second tronçon de forage.
3. Procédé selon la revendication 1, caractérisé en ce que, pour deux tronçons successifs du forage, on fore chacun de ceux-ci avec le diamètre relativement petit de la tête de forage (1) et on n'augmente le diamètre de cette tête de forage (1) qu'entre les deux tronçons du forage, ce diamètre étant utilisé pour forer au moins une longueur à peu près égale à la hauteur de la tête de forage, tandis qu'on réduit ensuite le diamètre de cette tête de forage (1), en procédant alors, dans l'état en suspension de la tête de forage (1), à la détermination de la direction utilisée pour la poursuite du forage, puis en forant le tronçon suivant du forage.
4. Appareillage permettant de réaliser des forages sensiblement verticaux, notamment des forages de grand diamètre, des puits ou analogues, comprenant une tête de forage (1) qui peut être entraînée en rotation par un train de tiges de forage (G) et un dispositif de mise sous tension (11) qui comprend des pièces de serrage (15) déployables et rétractables et pouvant être appliquées sous pression sur la paroi (W) du forage réalisé et qui est disposé dans la zone de l'appareillage qui suit vers l'arrière la tête de forage (1), ce dispositif de mise sous tension (11) comportant un élément de guidage pour un élément qui peut se déplacer par rapport à elle en même temps que la tête de forage (1) dans la direction de forage, notamment pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce que la tête de forage (1) comporte au moins un outil (4) déplaçable d'une position de travail se trouvant à l'extérieur, à une position se trouvant plus en retrait vers l'intérieur, et inversement, et dont le réglage en position permet de réduire et d'augmenter le diamètre de la tête de forage (1).
5. Appareillage selon la revendication 4, caractérisé en ce que l'outil déplaçable (4) est monté basculant.
6. Appareillage selon la revendication 4, caractérisé en ce que l'outil déplaçable (4) est monté déplaçable en translation.
7. Appareillage selon la revendication 4, caractérisé en ce que la tête de forage (1) est agencée à la façon d'un évideur (reamer) ou analogue.
8. Appareillage selon l'une des revendications 4 à 7, caractérisé en ce qu'il est prévu des dispositifs hydrauliques de manoeuvre (7) pour déplacer le ou les outils (4).
9. Appareillage selon la revendication 8, dans lequel les pièces de serrage du dispositif de mise sous tension (11) sont déplaçables en translation à l'aide de vérins hydrauliques (12, 13), caractérisé en ce que les vérins (12, 13) prévus pour les pièces de serrage (15) et les dispositifs hydrauliques de manoeuvre (7) prévus pour le ou les outils mobiles (4) de la tête de forage (1) peuvent être alimentés séparément en fluide sous pression en ce qui concerne un déplacement des pièces de serrage (15) et des outils (4) dirigé vers l'extérieur et peuvent être alimentés ensemble en fluide sous pression en ce qui concerne un déplacement des pièces de serrage (15) et des outils (4) dirigé vers l'intérieur.
10. Appareillage selon la revendication 9, caractérisé en ce que des clapets antiretour pilotés (26) sont associés aux vérins (12, 13) prévus pour les pièces de serrage (15).
11. Appareillage selon l'une des revendications 4 à 10, caractérisé en ce qu'il est prévu sur les pièces de serrage (15, 15'), ou sur des éléments mobiles avec celles-ci, des organes d'actionnement (76, 80) à l'aide desquels peuvent être directement ou indirectement manoeuvrés des organes de commande (68) destinés à influer sur le déplacement vers l'extérieur de ces pièces de serrage (15, 15').
12. Appareillage selon la revendication 11, caractérisé en ce que, pour servir d'organes d'actionnement, il est prévu des éléments de détection (80) déplaçables sur les pièces de serrage (15') et faisant saillie vers l'extérieur par rapport à celles-ci.
13. Appareillage selon l'une des revendications 11 et 12, dans lequel le pièces de serrage (15, 15') du dispositif de mise sous tension (11) sont déplaçables en translation à l'aide de vérins hydrauliques (12, 13), caractérisé en ce que le système hydraulique d'alimentation des vérins (12, 13) comprend des soupapes (68) pouvant être manoeuvrées en fonction des organes d'actionnement (76, 80) et à l'aide desquelles sont modifiables les conditions d'alimentation de ces vérins (12, 13).
14. Appareillage selon la revendication 13, caractérisé par des éléments structurels hydrauliques (60, 62) à l'aide desquels, lors de la manœu- vre des soupapes (68) par les organes d'actionnement (76, 80), du fluide sous pression peut être amené aux vérins (12, 13) sous une pression accrue.
15. Appareillage selon l'une des revendications 13 et 14, caractérisé en ce que le système hydraulique comprend dans les branches d'amenée du fluide sous pression (51, 61, 63), deux soupapes d'augmentation de pression (60, 62) réglables à des pressions différentes.
EP83104876A 1982-05-22 1983-05-18 Procédé et dispositif pour la réalisation de forages Expired EP0095134B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3219362A DE3219362C1 (de) 1982-05-22 1982-05-22 Verfahren und Vorrichtung zum Niederbringen von Bohrungen
DE3219362 1982-05-22

Publications (3)

Publication Number Publication Date
EP0095134A2 EP0095134A2 (fr) 1983-11-30
EP0095134A3 EP0095134A3 (en) 1985-03-13
EP0095134B1 true EP0095134B1 (fr) 1987-07-08

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EP83104876A Expired EP0095134B1 (fr) 1982-05-22 1983-05-18 Procédé et dispositif pour la réalisation de forages

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US (1) US4548282A (fr)
EP (1) EP0095134B1 (fr)
JP (1) JPS58210300A (fr)
AU (1) AU559712B2 (fr)
DE (2) DE3219362C1 (fr)
ZA (1) ZA833620B (fr)

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ZA833620B (en) 1984-07-25
DE3372391D1 (en) 1987-08-13
EP0095134A3 (en) 1985-03-13
AU559712B2 (en) 1987-03-19
JPS58210300A (ja) 1983-12-07
US4548282A (en) 1985-10-22
EP0095134A2 (fr) 1983-11-30
AU1468983A (en) 1983-11-24
DE3219362C1 (de) 1983-04-21

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