EP0956424B1 - Procede et dispositif pour foncer des forages, en particulier des forages d'exploration et d'exploitation dans le fond de la mer - Google Patents

Procede et dispositif pour foncer des forages, en particulier des forages d'exploration et d'exploitation dans le fond de la mer Download PDF

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Publication number
EP0956424B1
EP0956424B1 EP97951814A EP97951814A EP0956424B1 EP 0956424 B1 EP0956424 B1 EP 0956424B1 EP 97951814 A EP97951814 A EP 97951814A EP 97951814 A EP97951814 A EP 97951814A EP 0956424 B1 EP0956424 B1 EP 0956424B1
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EP
European Patent Office
Prior art keywords
drill string
platform
string portion
drilling head
drilling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97951814A
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German (de)
English (en)
Other versions
EP0956424A2 (fr
Inventor
Fritz Tibussek
Hermann-Josef Von Wirth
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
Priority claimed from DE19702984A external-priority patent/DE19702984C1/de
Application filed by Wirth Maschinen und Bohrgeraete Fabrik GmbH filed Critical Wirth Maschinen und Bohrgeraete Fabrik GmbH
Publication of EP0956424A2 publication Critical patent/EP0956424A2/fr
Application granted granted Critical
Publication of EP0956424B1 publication Critical patent/EP0956424B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • 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
    • E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
    • 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
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/29—Obtaining a slurry of minerals, e.g. by using nozzles
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/124—Underwater drilling with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/128—Underwater drilling from floating support with independent underwater anchored guide base

Definitions

  • the invention relates to a method and a device for drilling wells, in particular for prospecting and extraction drilling.
  • Digging holes are used for the purpose of investigation from deposits and are supposed to take a sample of the material available in the deposit.
  • Excavation holes are drilled in particular when the deposit is at greater depth and / or bodies of water above the deposit such as Lakes or oceans do not have to sink mines allow.
  • Extraction wells serve to extract the content of the deposit from soil layers.
  • Exemplary for extraction drilling be the degradation of those stored on the seabed marine sediments with diamond inclusions explained.
  • Such deposits that contain diamonds have mostly in front of estuaries in the form of not too big, layers formed on rocky ground.
  • To break down the diamond-containing sediment material mostly used devices that include a drill head, which with the help of a floating one Platform made of extending, extendable drill pipe is lowered to the sea floor. Under floating Platform is to understand every facility, its amount above the sea floor from the current water level depends. In particular, drill ships come in for this Consideration.
  • the overburden loosened during the drilling process becomes mostly by so-called "backwashing" - for example by using the known air lifting method - by conveyed the interior of the drill string down to the platform, where he has one at the top of the drill string provided, related to its internal volume Pipe bend is fed into facilities where the separation of diamonds and overburden in a known manner he follows.
  • the platform comprises a device the one caused, for example, by ocean swell allowed vertical movement of the platform without this the propulsive force fluctuates significantly or the Drill head is even lifted off the ground.
  • Such facilities usually include with a relatively large compensation volume connected pneumatic or hydro-pneumatic Piston / cylinder devices, for example on the cylinder side with the drill string, on the piston side with a the device carrying the drill string, for example a Derrick. Because of the cylinders connected compensation volume, the platform can be vertical Exercise movements without losing the strength with which Drilling tool on the ground, changed significantly. Is the attachment point of the piston / cylinder devices on the platform side below that on the drill string, this can be done by adjusting the pressure in the expansion tanks the contact pressure of the drill head on the Seabed of maximum the resulting weight can be set to a desired value.
  • From US-PS 3,319,726 is a device for Known drilling holes in the seabed in which the drill string to compensate for vertical movement the platform two axially displaceable relative to each other, telescopic interlocking drill string parts includes.
  • the storage of the inner and outer drill string part serves an elaborate, several seals and Floating piston device for pressure equalization, the filled with a hydraulic fluid and against that Penetration of sediment completely encapsulated to the outside is.
  • the disadvantage of this device is that it is complex in their manufacture and because of the complicated Construction is prone to failure.
  • the drill string includes a telescopic part, which, among other things, the Compensate for movement induced by ocean thinning should.
  • the drilling material is in these devices over the Interior of the drill string conveyed upwards by fresh water is supplied under pressure to the bore.
  • the drill string contains two concentrically arranged tubes, which form an annular gap between them. By the The fresh water supply and removal are carried out in an annular gap of the drilling material through the inner tube.
  • the drill strings too these devices are expensive to manufacture.
  • the invention is therefore based on the object Method and an apparatus of the type mentioned such further develop that these disadvantages are improved.
  • Drill string made of at least two telescopically interlocking Consists of strand parts which with a vertical, for example, motion induced by ocean swell the platform has a relative movement to one another it is no longer necessary for the drill string to be at least half the maximum vertical deflection to be expected the platform protrudes above it, but the upper one The end of the drill string can be directly above the platform surface lie.
  • the drill head is rotationally fixed to the drill string arranged.
  • a drive is provided on the platform that set the drill string in rotation (claim 2).
  • the drill string is rotatably on the Platform stored and the drill head is relative to the drill string set in rotation.
  • the drill string Management of electrical, hydraulic, etc. lines serve, without the need for complex rotating unions or coupling required.
  • This can also be done on the lower part of the drill string easily an end one to the platform guided rope are attached, making the lower Drill string part including drill head without much energy expenditure for example, raised from the bottom of the hole and to the Location can be relocated to the ground where one further drilling is to be carried out.
  • the invention is in terms of its device Aspect reproduced in claim 4.
  • the drill string includes an outer and an inner one Drill string part, the inner drill string part - thus the vertical movement of the platform can be compensated can - at least over a length that is the maximum by Ocean swell or similar expected vertical Movement of the platform corresponds to the normal position the platform pushed into the outer and at least by an amount equal to the maximum expected Deflection of the platform from its normal position downwards corresponds, can be pushed further into the outer drill string part is.
  • a particularly preferred technical configuration storage based on this principle is the subject of claims 7 to 10.
  • the outer part of the drill string with its upper end at the platform and at the lower Arrange the drill head at the end of the inner drill string part.
  • the arrangement provided in reverse because the upper, preferably longer, during drilling operations rigidly connected to the platform in the vertical direction upper drill string part from less expensive to manufacture Components.
  • Device is a device on the platform provided with which the drill string rotates can be provided around its longitudinal axis.
  • the drill head is then rotatably arranged on the drill string.
  • the drill string is rotatably mounted on the platform and a rotary drive is provided with which Help the drill head rotate in relation to the drill string is relocatable.
  • the non-rotatable mounting of the drill string on the platform takes place in accordance with this preferred embodiment Claim 14 preferably by a non-rotatable, gimbal Interception device ("gimbal").
  • gimbal a non-rotatable, gimbal Interception device
  • the drill head is preferably driven either electric or hydraulic (claims 15 and 16), the drive means preferably in the drill head integrated or arranged directly above it are.
  • the one required to use the air lifting method Pressure line can according to claim 17 on the outer circumference of the Drill string be fixed and parallel to it Longitudinal central axis run.
  • the Pressure line as a rollable from a winding drum Pressure hose formed (claim 18).
  • This Measure has the advantage that the pressure hose on both upper drill string part as well as on the lower drill string part can be easily connected.
  • An advantageous development of the invention Device is the subject of claim 19.
  • In this is at least on the drill string part carrying the drill head a buoyancy body arranged.
  • the Buoyancy volume of the buoyancy body can in the invention Device the desired contact pressure of the Drill head to be set on the seabed.
  • buoyancy body is a part of the weight load on the platform be compensated so that heavier and thus longer drill string parts can be held and the Device also for digging bores in greater depths is suitable.
  • the one designated as a whole by 100 in FIGS. 1 to 3 Device includes one on a floating platform 1 arranged mast 2, which is only hinted at in FIGS. 1 to 3 is shown. It is - as in Fig. 1 also only hinted at - equipped with a pulley 3, the raising or lowering of one or more Segments 4, 4 'one designated as a whole by 5 Drill string is used.
  • the - as already explained at the beginning - from removable Segments 4, 4 'existing drill string 5 includes a upper drill string part 6 and a lower drill string part 7.
  • the upper drill string part 6 opens telescopically at point 8 in the lower drill string part 7 and protrudes accordingly the representation in Fig. 1 up to point 9 in this inside.
  • the upper and lower drill string parts 6, 7 are in that for inserting the upper part of the drill string provided length range designed such that the drill string parts 6.7 in this length range with low friction in the longitudinal direction of the drill string relative to each other can move, twisting the two drill string parts 6.7 against each other around the longitudinal central axis of the drill string however is not possible.
  • One of these functional features bearing is shown below with reference to FIG. 4 and 5 will be described.
  • a Drill head 10 is arranged, which with the help of a the lower drill string part arranged rotary drive 11 relative to that in the embodiment rotatably in the Platform mounted, the reaction torque absorbing Drill string 5 is rotatable.
  • a hydraulic motor that via a hydraulic line 12 with pressurized Hydraulic fluid is supplied.
  • the hydraulic drive an electric drive to use and instead of the hydraulic line 12 to provide an electrical line.
  • Fig. 1 In the phase shown in Fig. 1 is the drill string 5 already by screwing individual segments 4 or 4 'mounted to its full length. At the top The end of the drill string is the outlet of the raised one Exhaust pipe elbows arranged. By synchronous Slackening of the pulley 3 and the winch 16 are the Drill string parts 6, 7 lowered until the upper area 18 of the upper drill string part 6 at the height of a gimbal suspended, in Fig. 1 schematically in the open Intercept device 19 shown in the state (“gimbal”) located.
  • the device 100 In the state shown in Fig. 2, the device 100 positioned so that the drill head located above the location of the seabed to be removed.
  • the Winch 16 subsided, causing the lower drill string part 7 by sliding down on the protruding into it Part of the upper drill string part 6 further lowered until the Drill head 10 rests on the seabed.
  • the ropes 16 ' are now further reduced so that - as in Fig. 3 shown - sag slack in a loop.
  • the resulting weight force of the lower drill string part 7 and the components connected to it determine the contact pressure between the face of the drill head and the Seabed.
  • the lower drill string part 7 can in the further Penetration of the drill head 10 into the seabed 20 continue to slide freely from the upper drill string part 6.
  • a buoyancy unit at the upper end of the lower drill string part 21 arranged.
  • the essentially tubular upper one Drill string part comprises a tubular part 23 circular Cross-section that is in by means of flanges with each other screwable segments 4 is divided.
  • About its in the lower length of drill string insertable are four Angular profiles 22 evenly distributed over the circumference parallel to the central longitudinal axis L on the tubular part 23 arranged.
  • Each angle profile 22 comprises two legs 22 ', 22' 'which form a right angle to one another.
  • the Angle profiles 22 are with the free edges of the legs 22 ', 22' 'with the tubular part 23 of the upper drill string part 6 over its length - at least in sections - welded.
  • Each Roller assembly 24 includes two pairs of rollers 25, 26, wherein the rollers 25.25 '; 26.26' belonging to a pair in the direction the central longitudinal axis are spaced from each other and whose axes of rotation run parallel to each other, however the axes of rotation of the pairs of rollers 25, 26 of a pair of rollers 24 are aligned perpendicular to each other.
  • Fig. 4 illustrated embodiment are in the longitudinal direction of the drill string two sets of four roller assemblies 24, 24 'provided to tilt the upper drill string part prevent in the lower drill string part can.
  • Each roll assembly 24 includes a roll holder 27, the one on the outer lateral surface essentially tubular segment 4 'of the lower drill string part 7 are arranged. According to the orientation and number of the rollers 28 belonging to a roller arrangement 24 27 holes in the reel seat for receiving reel shafts 29 incorporated. The holes are like this arranged that the axes of rotation S essentially outside the cross section of the lower drill string part 7 are, but the rollers 28 through machined openings 30 protrude into the inner cross section of the segment 4 ', so that the treads 31 of the rollers accordingly the outer surfaces of the angle profiles 22 are aligned and when the drill string parts are pushed together 6,7 roll on the outer surfaces of the angle profiles.
  • This type of storage is low-friction Movability of the upper and lower drill string part in the longitudinal direction relative to each other with simultaneous Transferability of high reaction moments around the central longitudinal axis L of the drill string guaranteed.
  • the dissolved sediment penetrates through this measure due to the in the internal volume of the upper drill string part negative pressure prevailing by using the air lifting method through the lower opening of the inner tube 36 into the Interior of the upper drill string part so that it already so far not with the roller assemblies 24 or angle profiles 22 can come into contact. Furthermore, the negative pressure prevailing inside the upper drill string part 6 to the fact that through the annular gap 49 from the upper end of lower drill string part 7 always a certain amount Ambient water is sucked up and the roller assembly 24th and washed around the angle profiles 22, so that any penetrated Sediment parts are always washed out.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Claims (22)

  1. Procédé pour réaliser des forages, en particulier de recherche et d'exploitation, dans le fond de la mer (40), selon lequel :
    le forage est effectué par une tête de forage (10) tournante, montée à l'extrémité inférieure d'un boyau de forage (5) capable de transmettre un couple, et dont l'extrémité supérieure est montée sur une plate-forme flottante (1),
    le boyau de forage (5) est constitué par au moins deux parties (6, 7) pouvant coulisser télescopiquement l'une dans l'autre et qui, lorsque la plate-forme effectue un mouvement vertical, engendré par exemple par la houle, présentent un mouvement relatif de sorte que la tête de forage (10) s'appuie avec une force relativement constante sur la surface à excaver,
    caractérisé en ce que
    les éléments de fond marin, détachés par le forage, sont extraits de celui-ci par refoulement à l'intérieur du boyau de forage, effectué selon le procédé de levage par air.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la tête de forage (10) est solidaire en rotation du boyau de forage qui lui-même est entraíné en rotation par un entraínement (11) prévu sur la plate-forme.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    le boyau de forage (5) est solidaire en rotation de la plate-forme (1) et la tête de forage (10) est mise en rotation par rapport au boyau de forage (5).
  4. Dispositif pour réaliser des forages, en particulier de recherche et d'exploitation, dans le fond de la mer, comportant un boyau de forage, capable de transmettre un couple, et dont l'extrémité supérieure est montée dans une plate-forme flottante tandis que son extrémité inférieure porte une tête de forage pouvant être entraínée en rotation, ce boyau étant constitué de plusieurs parties (6, 7) de forage pouvant coulisser axialement l'une dans l'autre avec peu de frottement,
    caractérisé en ce qu'
    il est prévu une entrée d'air, reliée à l'intérieur du boyau de forage permettant d'insuffler de l'air comprimé amené par une canalisation sous pression.
  5. Dispositif selon la revendication 4,
    caractérisé en ce que
    le boyau de forage comprend une partie interne et une partie externe (6, 7), la partie interne (6) pénétrant dans la partie externe (7) au moins sur une longueur qui correspond à la valeur maximale du mouvement vers le haut que l'on peut attendre de l'action de la houle, sur la plate-forme, et pouvant s'introduire plus à l'intérieur de la partie externe (7), de la déviation maximale vers le bas que l'on peut attendre pour la plate-forme quand celle-ci s'écarte de sa position normale.
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    la partie interne (6) du boyau de forage, au moins sur sa zone maximale de pénétration dans la partie externe, porte des rails répartis périphériquement et sur lesquels se déplacent des pièces de glissement, de préférence des galets (28), répartis sur la périphérie interne de la partie externe du boyau de forage.
  7. Dispositif selon la revendication 6,
    caractérisé en ce que
    la partie interne (6) du boyau de forage a la forme d'un tube et les rails dirigés vers l'axe longitudinal (L) de cette partie interne (6) sont des profilés angulaires (22) soudés par leurs bords longitudinaux libres à la surface externe de la partie interne du boyau de forage.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que
    la partie externe (7) du boyau de forage comprend, selon sa direction longitudinale, au moins une paire de galets (25, 25' ; 26, 26'), chacun des deux galets d'une paire étant associé à une portée externe d'un profilé angulaire (22) et en appui roulant sur cette portée.
  9. Dispositif selon la revendication 8,
    caractérisé en ce que
    chaque profilé angulaire comporte deux ailes (22', 22") à angle droit l'une de l'autre et à chaque profilé angulaire sont associées au moins deux paires de galets (24, 24') espacés longitudinalement et roulant chacune sur la portée externe d'une aile.
  10. Dispositif selon la revendication 9,
    caractérisé en ce que
    la partie externe (7) du boyau de forage a la forme d'un tube et comporte, fixés à sa périphérie externe des supports de galets (27) portant chacun au moins un galet (28) dont l'axe (S) est à l'extérieur de la section transversale de cette partie (7) et dont la portée de roulement, en traversant une découpe (30) usinée dans la partie externe (7), dépasse à l'intérieur de la section transversale de cette partie.
  11. Dispositif selon l'une quelconque des revendications 5 à 10,
    caractérisé en ce que
    la partie interne (6) du boyau de forage est montée par son extrémité supérieure dans la plate-forme (1) tandis que la partie externe (7) porte, à son extrémité inférieure, la tête de forage (10).
  12. Dispositif selon l'une quelconque des revendications 5 à 11,
    caractérisé en ce que
    sur la plate-forme (1) est monté un dispositif pour faire tourner le boyau de forage autour de son axe longitudinal (tête motrice) et la tête de forage est montée, solidaire en rotation, sur le boyau de forage.
  13. Dispositif selon l'une quelconque des revendications 5 à 11,
    caractérisé en ce que
    le boyau de forage (5) est monté solidaire en rotation sur la plate-forme (1), et il est prévu un entraínement en rotation (11) qui peut mettre la tête tournante (10) en rotation par rapport au boyau de forage (5).
  14. Dispositif selon la revendication 13,
    caractérisé en ce que
    le montage du boyau de forage (5) sur la plate-forme est assuré par un dispositif de prise (19) à cardan (Gimbal), de préférence en deux parties.
  15. Dispositif selon l'une des revendications 13 ou 14,
    caractérisé en ce que
    l'entraínement en rotation (11) est électrique.
  16. Dispositif selon l'une quelconque des revendications 13 ou 14,
    caractérisé en ce que
    l'entraínement en rotation (11) est hydraulique.
  17. Dispositif selon l'une quelconque des revendications 4 à 16,
    caractérisé en ce que
    la conduite servant à insuffler l'air comprimé dans le boyau de forage est fixée à la périphérie externe de ce boyau parallèlement à son axe longitudinal.
  18. Dispositif selon l'une quelconque des revendications 4 à 16,
    caractérisé en ce que
    la conduite d'air comprimé est un tuyau qui peut se dévider à partir d'un tambour d'enroulement.
  19. Dispositif selon l'une quelconque des revendications 4 à 18,
    caractérisé en ce que
    sur la partie du boyau de forage portant la tête de forage, est montée une unité d'entraínement (21).
  20. Dispositif selon la revendication 19,
    caractérisé en ce que
    l'unité d'entraínement (21) est montée près de l'extrémité supérieure de la partie inférieure (7) du boyau de forage.
  21. Dispositif selon la revendication 19 ou 20,
    caractérisé en ce que
    l'unité d'entraínement (21) comprend au moins un réservoir qui peut être rempli d'air comprimé.
  22. Dispositif selon l'une quelconque des revendications 4 à 21,
    caractérisé en ce qu'
    il est prévu au moins un corps d'entraínement (70) sur la partie du boyau de forage dont l'extrémité supérieure est montée sur la plate-forme.
EP97951814A 1996-12-10 1997-11-27 Procede et dispositif pour foncer des forages, en particulier des forages d'exploration et d'exploitation dans le fond de la mer Expired - Lifetime EP0956424B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19651303 1996-12-10
DE19651303 1996-12-10
DE19702984A DE19702984C1 (de) 1996-12-10 1997-01-28 Verfahren und Vorrichtung zum Niederbringen von Bohrlöchern, insbesondere für Schürf- und Gewinnungsbohrungen, in den Meeresboden
DE19702984 1997-01-28
PCT/DE1997/002770 WO1998026151A2 (fr) 1996-12-10 1997-11-27 Procede et dispositif pour foncer des forages, en particulier des forages d'exploration et d'exploitation dans le fond de la mer

Publications (2)

Publication Number Publication Date
EP0956424A2 EP0956424A2 (fr) 1999-11-17
EP0956424B1 true EP0956424B1 (fr) 2001-01-24

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EP97951814A Expired - Lifetime EP0956424B1 (fr) 1996-12-10 1997-11-27 Procede et dispositif pour foncer des forages, en particulier des forages d'exploration et d'exploitation dans le fond de la mer

Country Status (4)

Country Link
US (1) US6422324B1 (fr)
EP (1) EP0956424B1 (fr)
AU (1) AU730041B2 (fr)
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Publication number Publication date
AU730041B2 (en) 2001-02-22
AU5548398A (en) 1998-07-03
WO1998026151A3 (fr) 1998-10-01
EP0956424A2 (fr) 1999-11-17
WO1998026151A2 (fr) 1998-06-18
US6422324B1 (en) 2002-07-23

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