EP0904481A1 - Core machine - Google Patents

Core machine

Info

Publication number
EP0904481A1
EP0904481A1 EP97925061A EP97925061A EP0904481A1 EP 0904481 A1 EP0904481 A1 EP 0904481A1 EP 97925061 A EP97925061 A EP 97925061A EP 97925061 A EP97925061 A EP 97925061A EP 0904481 A1 EP0904481 A1 EP 0904481A1
Authority
EP
European Patent Office
Prior art keywords
end element
inner tube
internal
free end
coring
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.)
Granted
Application number
EP97925061A
Other languages
German (de)
French (fr)
Other versions
EP0904481B1 (en
Inventor
Pascal Bartette
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.)
Halliburton Energy Services Inc
Original Assignee
Dresser Industries Inc
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 Dresser Industries Inc filed Critical Dresser Industries Inc
Publication of EP0904481A1 publication Critical patent/EP0904481A1/en
Application granted granted Critical
Publication of EP0904481B1 publication Critical patent/EP0904481B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
    • 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
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems

Definitions

  • the present invention relates to a core barrel, in particular in the field of petroleum prospecting, comprising: - a coring ring, an outer tube for driving the coring ring in rotation, and an inner tube having an element of free anterior end intended to receive a core during coring, the inner and outer tubes being substantially coaxial, and a surface of revolution of the free end element, on the side of the crown, arranged to cooperate with a surface internal of the latter, or if necessary of the outer tube, so as to regulate between them a determined passage of coring fluid.
  • the free end element of the inner tube has a circular lip parallel to the longitudinal axis of rotation and located in an annular housing, of the crown, which also extends parallel to the longitudinal axis of rotation.
  • the adjustment of the fluid passage turns out to be delicate there, for example since the inner tube is fixed to the outer tube at a great distance from the place of this passage and given significant variations in length which can appear in a corer because of the variable and high temperatures that it can undergo during coring.
  • the operator who assembles a core barrel tries to obtain a correct adjustment of this passage, taking into account the differences in length presented by the different sections of the inner and outer tubes and taking into account the temperatures assumed to be reached during coring.
  • the inner tube may be made of a different material (for example fiberglass coated with a binder) than that of the outer tube which is usually made of steel, the differential expansions that these two tubes undergo are opposed to the '' and / or maintaining a desired adjustment of the fluid passage.
  • a core entering the inner tube can push it a little bit up the outer tube, depending on a clearance in the ball bearings or ball bearings which connect the inner and outer tubes, and this can significantly change the above setting.
  • a bad adjustment of said passage can lead for example to a too great flow of coring fluid towards the core and to a possibly deep deterioration of this one by washing, etc., or lead for example, in too great contact between said surface of revolution of the free end element and the internal surface of the crown or of the outer tube, with consequently seizing of these surfaces during the rotation of one with respect to the other, or a deformation and / or rupture of the free end element, etc.
  • the object of the present invention is to remedy the aforementioned drawbacks, and others not explained above but known to those skilled in the art, and to provide a means which makes it possible to obtain, in a safe and simple manner, the correct one. adjustment, even adjustment up to zero or close to zero passage for the coring fluid between the free end element of the inner tube and the corresponding internal bearing surface, without annoying pressure from one on the other, therefore without the aforementioned risks of seizure, deformation or rupture at this location.
  • the free end element is mounted in the core barrel so as to be able to slide coaxially on an end section of the inner tube, between a position in which the surface of revolution is in contact with the internal surface of the crown or respectively of the external tube and an extreme position away from this internal surface.
  • the sliding free end element and the end section each have a stop cooperating with each other, when the inner tube is removed from its position. core drilling in the outside tube, so as to block the free end element on the end section in another extreme position located beyond said contact position starting from the extreme position away of the internal surface.
  • Figure 1 shows schematically in axial section a section of a core barrel equipped according to the invention.
  • FIG. 2 schematically represents, on another scale, in axial half-section a section of another corer equipped according to the invention.
  • the core barrel 1 of FIG. 1 has a core bit 2 mounted on an outer tube 3, intended inter alia for driving the crown 2 in rotation, and an inner tube 4 intended to receive a core 5 during a coring operation.
  • a split frustoconical ring 6 is provided in the inner tube 4 and is intended to block a carrot in the latter.
  • the inner 4 and outer 3 tubes are each formed of various sections of tubes fixed to each other for example by screwing and are practically coaxial.
  • the inner tube 4 has a free front end 7, considering the direction of advancement of the core barrel 1 during coring.
  • This free end element 7 is delimited by a surface of revolution 8 arranged to cooperate with an internal surface 9 of the ring 2, or where appropriate of the outer tube 3 according to the reciprocal arrangement of these two components mounted one on or in the other, so as to adjust between the surface of revolution 8 and the internal surface 9 a determined passage of coring fluid.
  • the coring fluid is brought into an annular conduit 10, delimited by the inner 4 and outer 3 tubes, so as to reach the bottom of a coring hole by means of nozzles 11 crown 2. It may be desirable that a small amount of core fluid can pass directly from the annular duct 10 to a gap 12 between a core 5 and the crown 2, so as to lubricate and cool this place of friction between these two components. The flow of fluid to this gap must however be limited to prevent this fluid from damaging the core produced.
  • the free end element 7 is mounted in the core barrel 1 so as to be able to slide coaxially on an end section 13 of the inner tube 4, between a position in which the surface of revolution 8 is in contact with said internal surface 9 and an extreme position away from this internal surface 9.
  • the free end element 7 ends in a groove 14 which extends parallel to the longitudinal axis of the core barrel 1 and which has in its bottom the internal surface 9 for the support of the surface of revolution 8.
  • the free end element 7 abuts against an internal surface 9 of the crown 2 and the end section 13 has another free end element 15 which is fixed to it and which , in the coring position in the corer 1, can protrude relative to the free end element 7 sliding.
  • the sliding assembly can be adjusted so that the pressure of the coring fluid, acting on the surfaces of the free end element 7, presses against each other the surface of revolution 8 and the internal surface 9.
  • the force pressing can be considered low given the small area that presents or can present the free end element 7 at the pressure of the fluid.
  • This pressing force can however be increased by known hydraulic means (pressure drop for example and / or increase in flow rate) to prevent the free end element 7 from being pushed upwards, for example by debris. carrot passing between the crown 2 and the end section 13.
  • the contact between the surfaces of revolution 8 and internal 9 can be continuous and the passage of fluid from the conduit annular 10 towards the gap 12 is then practically closed. It is however possible, for example, to provide the free end element 7 with calibrated through holes (not shown) or calibrated notches (not shown) made in the surface of revolution 8 to allow a predetermined flow of fluid to pass pressure from it).
  • the sliding free end element 7 can also be mounted so as to be able to rotate on the end section 13. This makes it possible for example to distribute the wear due to friction, during the rotation of the outer tube 3 relative to to the inner tube 4, between the contact point of the revolution 8 and internal 9 surfaces and the contact point of the free end element 7 and the end section 13, or else to report this wear to this last place, for example the components are removable and replaceable.
  • At least said end section 13 can be arranged in a removable manner on the rest of the inner tube 4.
  • the free end elements 7 and end section 13 can be made of materials different from those of the inner 4, outer 3 and crown 2 tubes and can be adapted as a function of the friction to be subjected.
  • the free end element 7 and the end section 13 each comprise a stop 20, 21 cooperating with each other, when the inner tube 4 is removed from its coring position in the outer tube 3.
  • the stops 20, 21 cooperate so as to block the free end element 7 on said end section 13 in another extreme position (not shown) situated opposite said position of contact between surfaces of revolution 8 and internal 9 relative to the first extreme position cited, disposed away from the internal surface 9.
  • the end section 13 can comprise, as a stop 20, on the side of a well bottom in the coring position, an external cylindrical collar 22 and, between the latter and the rest of the inner tube 4, a cylindrical body 23 with an external diameter smaller than that of the external cylindrical collar 22.
  • the free end element 7 then comprises, on the side of the same well bottom, a cylindrical hole 24 opening, the internal diameter of which is adapted to the external diameter of the collar external 22 for the aforementioned sliding and, on the side opposite the bottom of the well, as a stop 21, an internal cylindrical collar 25 whose internal diameter is less than that of the cylindrical hole 24 and is adapted to the external diameter of the body cylindrical 23 for said sliding.
  • the removable arrangement of the end section 13 on the rest of the inner tube 4 can be constituted, for example, by an assembly with external thread on the end section 13, at its end away from the well bottom, and with internal thread on the corresponding end of the remainder of the inner tube 4.
  • the external thread has a diameter at most equal to the external diameter of the cylindrical body 23 and, when the threads are cylindrical, they are advantageously threads on the left.
  • a seal 30 can be mounted for example in the inner surface of the internal cylindrical collar 25 in order to cooperate with the peripheral surface external of the cylindrical body 23 and thus improve a seal against the coring fluid at this location.
  • the core barrel 1 of the invention advantageously comprises a tapered frustoconical ring 6, as shown in FIG. 1 and having a V-shaped groove 33 where it is split, an internal cylindrical surface 34 made rough, in known manner, for hooking a carrot 1 and a grooved outer frustoconical surface 35.
  • One or more notches 40 may be provided on one face of the free end element 7 facing the remainder of the inner tube 3. These notches 40 can be used to take off, optionally by pres ⁇ sion of the fluid, an element 7 by remaining audit report of the inner tube 3.
  • Notches 41 may be provided on the end face of the unscrewable end section 13, in order to receive a tool for screwing or unscrewing this section 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (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)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Earth Drilling (AREA)
  • Joints Allowing Movement (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Core machine intended particularly to the oil prospection field, comprising a core crown (2), an external tube (3) for the rotational driving of the core crown (2), and an internal tube (4) having a free front end element (7) intended to receive a core (5), and a revolution surface (8) of the free end element (7), on the crown side (2), arranged to cooperate with an internal surface (9) thereof, or optionally of the external tube (3), so as to adjust between the two a predetermined passage for the core drilling fluid, the free end element (7) being mounted in the core drilling machine (1) so as to slide coaxially on an extremity section (13) of the internal tube (4), between a position wherein the revolution surface (8) is in contact with the internal surface (9) of the crown (2), or respectively of the external tube (3), and an extreme position away from said internal surface (9).

Description

"Carottier" . "Corer".
La présente invention concerne un carottier, en particulier dans le domaine de la prospection pétro¬ lière, comprenant : - une couronne de carottage, un tube extérieur pour l'entraînement en rotation de la couronne de carottage, et un tube intérieur présentant un élément d'extrémité antérieur libre et destiné à recevoir une carotte au cours du carottage, les tubes intérieur et extérieur étant sensiblement coaxiaux, et une surface de révolution de l'élément d'extrémité libre, du côté de la couronne, agencée pour coopérer avec une surface interne de celle-ci, ou le cas échéant du tube extérieur, de façon à régler entre eux un passage déterminé de fluide de carottage.The present invention relates to a core barrel, in particular in the field of petroleum prospecting, comprising: - a coring ring, an outer tube for driving the coring ring in rotation, and an inner tube having an element of free anterior end intended to receive a core during coring, the inner and outer tubes being substantially coaxial, and a surface of revolution of the free end element, on the side of the crown, arranged to cooperate with a surface internal of the latter, or if necessary of the outer tube, so as to regulate between them a determined passage of coring fluid.
Dans le cas d'un carottier de ce genre, l'élément d'extrémité libre du tube intérieur présente une lèvre circulaire parallèle à l'axe longitudinal de rotation et située dans un logement annulaire, de la couronne, qui s'étend également parallèlement à l'axe longitudinal de rotation. Le réglage du passage de fluide s'y avère délicat, par exemple étant donné que le tube intérieur est fixé au tube extérieur à une grande distance de l'endroit de ce passage et étant donné des variations de longueur importantes qui peuvent apparaî¬ tre dans un carottier en raison des températures varia¬ bles et élevées que celui-ci peut subir en cours de carottage. A ce jour, l'opérateur qui assemble un carottier tente d'obtenir un réglage correct de ce passage, en tenant compte des écarts de longueur que présentent les différents tronçons des tubes intérieur et extérieur et en tenant compte des températures supposées atteintes lors du carottage. Il est cependant connu que pratiquement le passage réellement obtenu peut être trop différent de celui qui est visé. De plus, le tube intérieur peut être en une matière différente (par exemple de la fibre de verre enrobée d'un liant) de celle du tube extérieur qui est usuellement en acier, les dilatations différentielles que ces deux tubes subissent s'opposent à l'obtention et/ou au maintien d'un réglage souhaité du passage de fluide. En outre, une carotte entrant dans le tube intérieur peut pousser celui-ci quelque peu vers le haut du tube extérieur, en fonction d'un jeu dans les butées à billes ou roulements à billes qui relient les tubes intérieur et extérieur, et cela peut changer sensiblement le réglage précité.In the case of a corer of this kind, the free end element of the inner tube has a circular lip parallel to the longitudinal axis of rotation and located in an annular housing, of the crown, which also extends parallel to the longitudinal axis of rotation. The adjustment of the fluid passage turns out to be delicate there, for example since the inner tube is fixed to the outer tube at a great distance from the place of this passage and given significant variations in length which can appear in a corer because of the variable and high temperatures that it can undergo during coring. To date, the operator who assembles a core barrel tries to obtain a correct adjustment of this passage, taking into account the differences in length presented by the different sections of the inner and outer tubes and taking into account the temperatures assumed to be reached during coring. However, it is known that practically the passage actually obtained may be too different from that which is targeted. In addition, the inner tube may be made of a different material (for example fiberglass coated with a binder) than that of the outer tube which is usually made of steel, the differential expansions that these two tubes undergo are opposed to the '' and / or maintaining a desired adjustment of the fluid passage. In addition, a core entering the inner tube can push it a little bit up the outer tube, depending on a clearance in the ball bearings or ball bearings which connect the inner and outer tubes, and this can significantly change the above setting.
Dans l'un comme dans l'autre cas, un mauvais réglage dudit passage peut conduire par exemple à un trop grand débit de fluide de carottage vers la carotte et à une altération éventuellement profonde de celle-ci par lavage, etc., ou conduire par exemple à un contact trop important entre ladite surface de révolution de l'élément d'extrémité libre et la surface interne de la couronne ou du tube extérieur, avec en conséquence un grippage de ces surfaces pendant la rotation de l'une par rapport à l'autre, ou une déformation et/ou rupture de l'élément d'extrémité libre, etc.In one as in the other case, a bad adjustment of said passage can lead for example to a too great flow of coring fluid towards the core and to a possibly deep deterioration of this one by washing, etc., or lead for example, in too great contact between said surface of revolution of the free end element and the internal surface of the crown or of the outer tube, with consequently seizing of these surfaces during the rotation of one with respect to the other, or a deformation and / or rupture of the free end element, etc.
La présente invention a pour but de remédier aux inconvénients précités, et à d'autres non expliqués ci-dessus mais connus de l'homme du métier, et de procurer un moyen qui permette d'obtenir d'une façon sûre et simple le bon réglage, même un réglage jusqu'à un passage nul ou voisin de zéro pour le fluide de carottage entre l'élément d'extrémité libre du tube intérieur et la surface interne d'appui correspondante, sans pression gênante de l'un sur l'autre, donc sans les risques susdits de grippage, de déformation ou de rupture à cet endroit.The object of the present invention is to remedy the aforementioned drawbacks, and others not explained above but known to those skilled in the art, and to provide a means which makes it possible to obtain, in a safe and simple manner, the correct one. adjustment, even adjustment up to zero or close to zero passage for the coring fluid between the free end element of the inner tube and the corresponding internal bearing surface, without annoying pressure from one on the other, therefore without the aforementioned risks of seizure, deformation or rupture at this location.
A cet effet, suivant la présente invention, l'élément d'extrémité libre est monté dans le carottier de façon à pouvoir coulisser coaxialement sur un tronçon d'extrémité du tube intérieur, entre une position dans laquelle la surface de révolution est en contact avec la surface interne de la couronne ou respectivement du tube extérieur et une position extrême à l'écart de cette surface interne.To this end, according to the present invention, the free end element is mounted in the core barrel so as to be able to slide coaxially on an end section of the inner tube, between a position in which the surface of revolution is in contact with the internal surface of the crown or respectively of the external tube and an extreme position away from this internal surface.
Dans une forme de réalisation de l'inven¬ tion, l'élément d'extrémité libre coulissant et le tronçon d ' extrémité comportent chacun une butée coopé- rant l'une avec l'autre, lorsque le tube intérieur est retiré de sa position de carottage dans le tube exté¬ rieur, de façon à bloquer l'élément d'extrémité libre sur le tronçon d'extrémité dans une autre position extrême située au-delà de ladite position de contact en partant de la position extrême à l'écart de la surface interne.In one embodiment of the invention, the sliding free end element and the end section each have a stop cooperating with each other, when the inner tube is removed from its position. core drilling in the outside tube, so as to block the free end element on the end section in another extreme position located beyond said contact position starting from the extreme position away of the internal surface.
D'autres détails et particularités de l'invention ressortiront des revendications secondaires et de la description des dessins qui sont annexés au présent mémoire et qui illustrent, à titre d'exemples non limitatifs, des formes de réalisation de l'inven¬ tion.Other details and particularities of the invention will emerge from the secondary claims and from the description of the drawings which are annexed to the present specification and which illustrate, by way of nonlimiting examples, embodiments of the invention.
La figure 1 représente schématiquement en coupe axiale un tronçon d'un carottier équipé suivant l'invention.Figure 1 shows schematically in axial section a section of a core barrel equipped according to the invention.
La figure 2 représente schématiquement, à une autre échelle, en demi-coupe axiale un tronçon d'un autre carottier équipé suivant l'invention.FIG. 2 schematically represents, on another scale, in axial half-section a section of another corer equipped according to the invention.
Dans les différentes figures, les mêmes notations de référence désignent des éléments identiques ou analogues. Pour la clarté des dessins, certains éléments du carottier sont représentés par leurs contours en traits mixtes et sans hachures.In the various figures, the same reference notations designate identical or analogous elements. For the sake of clarity, some elements of the core barrel are represented by their contours in mixed lines and without hatching.
Le carottier 1 de la figure 1 présente une couronne de carottage 2 montée sur un tube extérieur 3, destiné entre autre à l'entraînement en rotation de la couronne 2, et un tube intérieur 4 destiné à recevoir une carotte 5 au cours d'une opération de carottage. Une bague tronconique fendue 6 est prévue dans le tube intérieur 4 et est destinée à bloquer dans celui-ci une carotte. Les tubes intérieur 4 et extérieur 3 sont formés chacun de divers tronçons de tubes fixés l'un à l'autre par exemple par vissage et sont pratiquement coaxiaux. Le tube intérieur 4 présente une extrémité antérieure libre 7, en considérant le sens d'avancement du carottier 1 au cours d'un carottage. Cet élément d'extrémité libre 7 est délimité par une surface de révolution 8 agencée pour coopérer avec une surface interne 9 de la couronne 2 , ou le cas échéant du tube extérieur 3 selon l'agencement réciproque de ces deux composants montés l'un sur ou dans l'autre, de façon à régler entre la surface de révolution 8 et la surface interne 9 un passage déterminé de fluide de carottage.The core barrel 1 of FIG. 1 has a core bit 2 mounted on an outer tube 3, intended inter alia for driving the crown 2 in rotation, and an inner tube 4 intended to receive a core 5 during a coring operation. A split frustoconical ring 6 is provided in the inner tube 4 and is intended to block a carrot in the latter. The inner 4 and outer 3 tubes are each formed of various sections of tubes fixed to each other for example by screwing and are practically coaxial. The inner tube 4 has a free front end 7, considering the direction of advancement of the core barrel 1 during coring. This free end element 7 is delimited by a surface of revolution 8 arranged to cooperate with an internal surface 9 of the ring 2, or where appropriate of the outer tube 3 according to the reciprocal arrangement of these two components mounted one on or in the other, so as to adjust between the surface of revolution 8 and the internal surface 9 a determined passage of coring fluid.
Dans le cas de la figure 1, le fluide de carottage est amené dans un conduit annulaire 10, délimité par les tubes intérieur 4 et extérieur 3, de façon à aboutir au fond d'un trou de carottage par l'intermédiaire d'ajutages 11 de la couronne 2. Il peut être souhaité qu'une petite quantité de fluide de carot¬ tage puisse cependant directement passer du conduit annulaire 10 jusqu'à un interstice 12 entre une carotte 5 et la couronne 2, de façon à lubrifier et refroidir cet endroit de frottement entre ces deux composants. Le débit de fluide vers cet interstice doit cependant être limité pour éviter que ce fluide n'altère pas la carotte produite. A cet effet, et pour les raisons exposées plus haut, l'élément d'extrémité libre 7 est monté dans le carottier 1 de façon à pouvoir coulisser coaxialement sur un tronçon d'extrémité 13 du tube intérieur 4, entre une position dans laquelle la surface de révolution 8 est en contact avec ladite surface interne 9 et une position extrême à l'écart de cette surface interne 9. Dans la forme de réalisation de la figure 1, l'élément d'extrémité libre 7 aboutit dans une gorge 14 qui s'étend parallèlement à l'axe longitudinal du carottier 1 et qui comporte dans son fond la surface interne 9 pour l'appui de la surface de révolution 8.In the case of FIG. 1, the coring fluid is brought into an annular conduit 10, delimited by the inner 4 and outer 3 tubes, so as to reach the bottom of a coring hole by means of nozzles 11 crown 2. It may be desirable that a small amount of core fluid can pass directly from the annular duct 10 to a gap 12 between a core 5 and the crown 2, so as to lubricate and cool this place of friction between these two components. The flow of fluid to this gap must however be limited to prevent this fluid from damaging the core produced. For this purpose, and for the reasons explained above, the free end element 7 is mounted in the core barrel 1 so as to be able to slide coaxially on an end section 13 of the inner tube 4, between a position in which the surface of revolution 8 is in contact with said internal surface 9 and an extreme position away from this internal surface 9. In the embodiment of FIG. 1, the free end element 7 ends in a groove 14 which extends parallel to the longitudinal axis of the core barrel 1 and which has in its bottom the internal surface 9 for the support of the surface of revolution 8.
Dans la forme de réalisation de la figure 2, l'élément d'extrémité libre 7 aboutit contre une surface interne 9 de la couronne 2 et le tronçon d'extrémité 13 comporte un autre élément d'extrémité libre 15 qui y est fixé et qui, en position de carottage dans le carottier 1, peut faire saillie par rapport à l'élément d'extré¬ mité libre 7 coulissant. Le montage coulissant peut être ajusté pour que la pression du fluide de carottage, agissant sur les surfaces de l'élément d'extrémité libre 7, presse l'une contre l'autre la surface de révolution 8 et la surface interne 9. La force de pressage peut être considérée comme faible étant donné le peu de surfaces que présente ou peut présenter l'élément d'extrémité libre 7 à la pression du fluide. Cette force de pressage peut cepen¬ dant être augmentée par des moyens hydrauliques connus (pertes de charge par exemple et/ou augmentation de débit) pour empêcher que l'élément d'extrémité libre 7 soit poussé vers le haut, par exemple par des débris de carotte passant entre la couronne 2 et le tronçon d'extrémité 13.In the embodiment of FIG. 2, the free end element 7 abuts against an internal surface 9 of the crown 2 and the end section 13 has another free end element 15 which is fixed to it and which , in the coring position in the corer 1, can protrude relative to the free end element 7 sliding. The sliding assembly can be adjusted so that the pressure of the coring fluid, acting on the surfaces of the free end element 7, presses against each other the surface of revolution 8 and the internal surface 9. The force pressing can be considered low given the small area that presents or can present the free end element 7 at the pressure of the fluid. This pressing force can however be increased by known hydraulic means (pressure drop for example and / or increase in flow rate) to prevent the free end element 7 from being pushed upwards, for example by debris. carrot passing between the crown 2 and the end section 13.
Suivant les dessins des figures 1 et 2 , le contact entre les surfaces de révolution 8 et interne 9 peut être continu et le passage de fluide du conduit annulaire 10 vers l'interstice 12 est alors pratiquement fermé. On peut cependant par exemple munir l'élément d'extrémité libre 7 de trous de passage calibrés (non représentés) ou d'entailles calibrées (non représentées) réalisées dans la surface de révolution 8 pour laisser passer un débit déterminé de fluide (en fonction de la pression de celui-ci) .According to the drawings of Figures 1 and 2, the contact between the surfaces of revolution 8 and internal 9 can be continuous and the passage of fluid from the conduit annular 10 towards the gap 12 is then practically closed. It is however possible, for example, to provide the free end element 7 with calibrated through holes (not shown) or calibrated notches (not shown) made in the surface of revolution 8 to allow a predetermined flow of fluid to pass pressure from it).
L'élément d'extrémité libre 7 coulissant peut en outre être monté de façon à pouvoir tourner sur le tronçon d'extrémité 13. Ceci permet par exemple de répartir l'usure due au frottement, lors de la rotation du tube extérieur 3 par rapport au tube intérieur 4, entre l'endroit de contact des surfaces de révolution 8 et interne 9 et l'endroit de contact de l'élément d'extrémité libre 7 et du tronçon d'extrémité 13, ou bien de reporter cette usure à ce dernier endroit dont par exemple les constituants sont démontables et rempla- çables.The sliding free end element 7 can also be mounted so as to be able to rotate on the end section 13. This makes it possible for example to distribute the wear due to friction, during the rotation of the outer tube 3 relative to to the inner tube 4, between the contact point of the revolution 8 and internal 9 surfaces and the contact point of the free end element 7 and the end section 13, or else to report this wear to this last place, for example the components are removable and replaceable.
Pour cette raison au moins ledit tronçon d'extrémité 13 peut être agencé de façon démontable sur le reste du tube intérieur 4.For this reason at least said end section 13 can be arranged in a removable manner on the rest of the inner tube 4.
Les éléments d'extrémité libre 7 et tronçon d'extrémité 13 peuvent être réalisés en des matériaux différents de ceux des tubes intérieur 4 , extérieur 3 et couronne 2 et être adaptés en fonction du frottement à subir.The free end elements 7 and end section 13 can be made of materials different from those of the inner 4, outer 3 and crown 2 tubes and can be adapted as a function of the friction to be subjected.
De préférence, l'élément d'extrémité libre 7 et le tronçon d'extrémité 13 comportent chacun une butée 20, 21 coopérant l'une avec l'autre, lorsque le tube intérieur 4 est retiré de sa position de carottage dans le tube extérieur 3. Les butées 20, 21 coopèrent de façon à bloquer l'élément d'extrémité libre 7 sur ledit tronçon d'extrémité 13 dans une autre position extrême (non représentée) située à l'opposé de ladite position de contact entre surfaces de révolution 8 et interne 9 par rapport à la première position extrême citée, disposée à l'écart de la surface interne 9.Preferably, the free end element 7 and the end section 13 each comprise a stop 20, 21 cooperating with each other, when the inner tube 4 is removed from its coring position in the outer tube 3. The stops 20, 21 cooperate so as to block the free end element 7 on said end section 13 in another extreme position (not shown) situated opposite said position of contact between surfaces of revolution 8 and internal 9 relative to the first extreme position cited, disposed away from the internal surface 9.
Avantageusement, le tronçon d'extrémité 13 peut comporter en tant que butée 20, du côté d'un fond de puits dans la position de carottage, un collet cylindrique externe 22 et, entre celui-ci et le restant du tube intérieur 4, un corps cylindrique 23 de diamètre externe inférieur à celui du collet cylindrique externe 22. L'élément d'extrémité libre 7 comporte alors, du côté du même fond de puits, un trou cylindrique 24 débouchant dont le diamètre interne est adapté au diamètre externe du collet externe 22 en vue du coulis- sement précité et, du côté opposé au fond du puits, en tant que butée 21, un collet cylindrique interne 25 dont le diamètre interne est inférieur à celui du trou cylindrique 24 et est adapté au diamètre externe du corps cylindrique 23 en vue dudit coulissement.Advantageously, the end section 13 can comprise, as a stop 20, on the side of a well bottom in the coring position, an external cylindrical collar 22 and, between the latter and the rest of the inner tube 4, a cylindrical body 23 with an external diameter smaller than that of the external cylindrical collar 22. The free end element 7 then comprises, on the side of the same well bottom, a cylindrical hole 24 opening, the internal diameter of which is adapted to the external diameter of the collar external 22 for the aforementioned sliding and, on the side opposite the bottom of the well, as a stop 21, an internal cylindrical collar 25 whose internal diameter is less than that of the cylindrical hole 24 and is adapted to the external diameter of the body cylindrical 23 for said sliding.
Il doit être entendu que l'invention n'est nullement limitée aux formes de réalisation décrites et que bien des modifications peuvent être apportées à ces dernières sans sortir du cadre de la présente invention. Ainsi, dans le carottier suivant l'inven¬ tion, l'agencement démontable du tronçon d'extrémité 13 sur le reste du tube intérieur 4 peut être constitué par exemple par un ensemble à pas de vis externe sur le tronçon d'extrémité 13, à son extrémité à l'écart du fond de puits, et à pas de vis interne sur l'extrémité correspondante du restant du tube intérieur 4. De préférence, le pas de vis externe a un diamètre au plus égal au diamètre externe du corps cylindrique 23 et, lorsque les pas de vis sont cylindriques, il sont avantageusement des pas de vis à gauche.It should be understood that the invention is in no way limited to the embodiments described and that many modifications can be made to these without departing from the scope of the present invention. Thus, in the corer according to the invention, the removable arrangement of the end section 13 on the rest of the inner tube 4 can be constituted, for example, by an assembly with external thread on the end section 13, at its end away from the well bottom, and with internal thread on the corresponding end of the remainder of the inner tube 4. Preferably, the external thread has a diameter at most equal to the external diameter of the cylindrical body 23 and, when the threads are cylindrical, they are advantageously threads on the left.
Un joint d'étanchéité 30 peut être monté par exemple dans la surface intérieure du collet cylindrique interne 25 afin de coopérer avec la surface périphérique externe du corps cylindrique 23 et d'améliorer ainsi une étanchéité au fluide de carottage en cet endroit.A seal 30 can be mounted for example in the inner surface of the internal cylindrical collar 25 in order to cooperate with the peripheral surface external of the cylindrical body 23 and thus improve a seal against the coring fluid at this location.
Le carottier 1 de l'invention comporte avantageusement une bague tronconique fendue 6, telle que représentée à la figure 1 et présentant une saignée en V 33 là où elle est fendue, une surface cylindrique interne 34 rendue rugueuse, de façon connue, pour accrocher une carotte 1 et une surface tronconique externe 35 rainurée. Une ou des encoches 40 peuvent être prévues sur une face de l'élément d'extrémité libre 7 tournée vers le restant du tube intérieur 3. Ces encoches 40 peuvent servir à décoller, éventuellement par la pres¬ sion du fluide, un élément 7 par rapport audit restant du tube intérieur 3.The core barrel 1 of the invention advantageously comprises a tapered frustoconical ring 6, as shown in FIG. 1 and having a V-shaped groove 33 where it is split, an internal cylindrical surface 34 made rough, in known manner, for hooking a carrot 1 and a grooved outer frustoconical surface 35. One or more notches 40 may be provided on one face of the free end element 7 facing the remainder of the inner tube 3. These notches 40 can be used to take off, optionally by pres¬ sion of the fluid, an element 7 by remaining audit report of the inner tube 3.
Des encoches 41 peuvent être prévues sur la face d'extrémité du tronçon d'extrémité 13 dévissable, afin de recevoir un outil pour le vissage ou le dévis¬ sage de ce tronçon 13. Notches 41 may be provided on the end face of the unscrewable end section 13, in order to receive a tool for screwing or unscrewing this section 13.

Claims

REVENDICATIONS
1. Carottier, en particulier dans le domaine de la prospection pétrolière, comprenant : une couronne de carottage (2) , - un tube extérieur (3) pour l'entraînement en rota¬ tion de la couronne de carottage (2) , et un tube intérieur (4) présentant un élément d'extré¬ mité antérieure libre (7) et destiné à recevoir une carotte (5) au cours du carottage, les tubes inté- rieur (4) et extérieur (3) étant sensiblement coaxiaux, et une surface de révolution (8) de l'élément d'extré¬ mité libre (7) , du côté de la couronne (2) , agencée pour coopérer avec une surface interne (9) de celle- ci, ou le cas échéant du tube extérieur (3) , de façon à régler entre eux un passage déterminé de fluide de carottage, caractérisé en ce que l'élément d'extrémité libre (7) est monté dans le carottier (1) de façon à pouvoir coulisser coaxialement sur un tronçon d'extrémité (13) du tube intérieur (4) , entre une position dans laquelle la surface de révolution (8) est en contact avec la surface interne (9) de la couronne (2) , ou respecti¬ vement du tube extérieur (3) , et une position extrême à l'écart de cette surface interne (9) .1. Corer, in particular in the field of oil prospecting, comprising: a coring ring (2), - an outer tube (3) for the rotational drive of the coring ring (2), and a inner tube (4) having a free anterior end element (7) and intended to receive a core (5) during coring, the inner (4) and outer (3) tubes being substantially coaxial, and a surface of revolution (8) of the free end element (7), on the side of the crown (2), arranged to cooperate with an internal surface (9) thereof, or where appropriate of the outer tube (3), so as to regulate between them a determined passage of coring fluid, characterized in that the free end element (7) is mounted in the corer (1) so as to be able to slide coaxially on a end section (13) of the inner tube (4), between a position in which the surface of revolution (8) is in contact with the internal surface (9) of the crown (2), or respecti¬ vely the external tube (3), and an extreme position away from this internal surface (9).
2. Carottier suivant la revendication 1, caractérisé en ce que l'élément d'extrémité libre coulissant (7) est monté de façon à pouvoir tourner sur le tronçon d'extrémité (13) susdit. 2. Corer according to claim 1, characterized in that the sliding free end element (7) is mounted so as to be able to rotate on the end section (13) above.
3. Carottier suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que l'élément d'extrémité libre coulissant (7) et le tronçon d'extré¬ mité (13) comportent chacun une butée (20, 21) coopérant l'une avec l'autre, lorsque le tube intérieur (4) est retiré de sa position de carottage dans le tube exté¬ rieur (3) , de façon à bloquer l'élément d'extrémité libre (7) sur le tronçon d'extrémité (13) dans une autre position extrême située au-delà de ladite position de contact par rapport à la position extrême à l'écart de la surface interne (9) . 3. Corer according to either of Claims 1 and 2, characterized in that the sliding free end element (7) and the end section (13) each have a stop (20, 21) cooperating with each other, when the inner tube (4) is removed from its coring position in the outer tube (3), so as to block the end element free (7) on the end section (13) in another extreme position located beyond said contact position relative to the extreme position away from the internal surface (9).
4. Carottier suivant l'une quelconque des revendications l à 3, caractérisé en ce que ledit tronçon d'extrémité (13) est agencé de façon démontable sur le reste du tube intérieur (4) .4. Corer according to any one of claims l to 3, characterized in that said end section (13) is arranged in a removable manner on the rest of the inner tube (4).
5. Carottier suivant la revendication 4, caractérisé en ce que le tronçon d'extrémité (13) comporte en tant que butée (20) , du côté d'un fond de puits dans la position carottage, un collet cylindrique externe (22) et, entre celui-ci et le restant du tube intérieur (4) , un corps cylindrique (23) de diamètre externe inférieur à celui du collet cylindrique externe (22) et en ce que l'élément d'extrémité libre (7) comporte, du côté du même fond de puits, un trou cylin¬ drique (24) débouchant dont le diamètre interne est adapté au diamètre externe du collet externe (22) en vue du coulissement précité et, du côté opposé au fond du puits, en tant que butée (21) , un collet cylindrique interne (25) dont le diamètre interne est inférieur à celui du trou cylindrique (24) et est adapté au diamètre externe du corps cylindrique (23) en vue dudit coulisse- ment.5. Corer according to claim 4, characterized in that the end section (13) comprises as a stop (20), on the side of a well bottom in the coring position, an external cylindrical collar (22) and , between the latter and the remainder of the inner tube (4), a cylindrical body (23) of external diameter smaller than that of the external cylindrical collar (22) and in that the free end element (7) comprises, on the side of the same well bottom, a cylindrical hole (24) emerging, the internal diameter of which is adapted to the external diameter of the external collar (22) for the aforementioned sliding and, on the side opposite the bottom of the well, as stop (21), an internal cylindrical collar (25) whose internal diameter is less than that of the cylindrical hole (24) and is adapted to the external diameter of the cylindrical body (23) for said sliding.
6. Carottier suivant l'une ou l'autre des revendications 4 et 5 , caractérisé en ce que l'agence¬ ment démontable du tronçon d'extrémité sur le reste du tube intérieur (4) est constitué par un ensemble à pas de vis externe sur le tronçon d'extrémité (13) , à son extrémité à l'écart du fond de puits, et à pas de vis interne sur l'extrémité correspondante du restant du tube intérieur (4) , en ce que, de préférence, le pas de vis externe a un diamètre au plus égal au diamètre externe du corps cylindrique (23) et en ce que, lorsque les pas de vis sont cylindriques, il sont avantageuse¬ ment des pas de vis à gauche.6. Corer according to either of claims 4 and 5, characterized in that the agency¬ detachable ment of the end section on the rest of the inner tube (4) is constituted by an assembly with screw thread outer on the end section (13), at its end away from the well bottom, and with internal thread on the corresponding end of the remainder of the inner tube (4), in that, preferably, the external screw pitch has a diameter at most equal to the external diameter of the cylindrical body (23) and in that, when the threads are cylindrical, they are advantageously threads on the left.
7. Carottier suivant l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comporte des moyens hydrauliques agencés pour agir sur l'élément d'extrémité libre (7) de façon à presser la surface de révolution (8) sur la surface interne (9) avec une force contrôlée. 7. Corer according to any one of claims 1 to 6, characterized in that it comprises hydraulic means arranged to act on the free end element (7) so as to press the surface of revolution (8) on the internal surface (9) with a controlled force.
EP97925061A 1996-06-05 1997-06-03 Core machine Expired - Lifetime EP0904481B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9600504 1996-06-05
BE9600504A BE1010325A3 (en) 1996-06-05 1996-06-05 Core.
PCT/EP1997/002964 WO1997046790A1 (en) 1996-06-05 1997-06-03 Core machine

Publications (2)

Publication Number Publication Date
EP0904481A1 true EP0904481A1 (en) 1999-03-31
EP0904481B1 EP0904481B1 (en) 2002-01-16

Family

ID=3889782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97925061A Expired - Lifetime EP0904481B1 (en) 1996-06-05 1997-06-03 Core machine

Country Status (7)

Country Link
US (1) US6145604A (en)
EP (1) EP0904481B1 (en)
BE (1) BE1010325A3 (en)
CA (1) CA2257377C (en)
DE (1) DE69709638T2 (en)
NO (1) NO315530B1 (en)
WO (1) WO1997046790A1 (en)

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BE1011502A3 (en) 1997-10-17 1999-10-05 Dresser Ind Core.
CA2652563A1 (en) * 2006-05-15 2007-11-29 Baker Hughes Incorporated Core drill assembly with adjustable total flow area and restricted flow between outer and inner barrel assemblies
CZ304007B6 (en) * 2012-01-13 2013-08-14 Vysoká Skola Bánská Technická - Univerzita Ostrava Mechanical arm for taking out test cores
RU2516311C2 (en) * 2012-05-14 2014-05-20 Открытое акционерное общество "Научно-производственное предприятие "Бурсервис" Device for core separation and fixation in disassembly of core bbl
WO2014018737A1 (en) * 2012-07-26 2014-01-30 National Oilwell Varco L.P. Telescoping core barrel
US20150337654A1 (en) * 2013-02-05 2015-11-26 Sadi Sami Ahmad ALSHANNAQ Obtaining a downhole core sample measurement using logging while coring
CN103590773A (en) * 2013-11-16 2014-02-19 无锡中地地质装备有限公司 Snap spring
CN105508374A (en) * 2015-12-29 2016-04-20 苏州市诚品精密机械有限公司 Novel clamp ring
CN105672926B (en) * 2016-01-19 2018-03-23 宝鸡石油机械有限责任公司 Seabed rig type hydraulic actuator helmet spinner assembly
US10597963B2 (en) 2018-04-26 2020-03-24 Baker Hughes Oilfield Operations Llc Coring tools including a core catcher
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Also Published As

Publication number Publication date
BE1010325A3 (en) 1998-06-02
NO985641L (en) 1998-12-03
DE69709638D1 (en) 2002-02-21
US6145604A (en) 2000-11-14
NO315530B1 (en) 2003-09-15
CA2257377A1 (en) 1997-12-11
WO1997046790A1 (en) 1997-12-11
CA2257377C (en) 2002-11-19
NO985641D0 (en) 1998-12-03
EP0904481B1 (en) 2002-01-16
DE69709638T2 (en) 2002-10-02

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