EP0904481B1 - Core machine - Google Patents

Core machine Download PDF

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Publication number
EP0904481B1
EP0904481B1 EP97925061A EP97925061A EP0904481B1 EP 0904481 B1 EP0904481 B1 EP 0904481B1 EP 97925061 A EP97925061 A EP 97925061A EP 97925061 A EP97925061 A EP 97925061A EP 0904481 B1 EP0904481 B1 EP 0904481B1
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EP
European Patent Office
Prior art keywords
core
free end
end portion
end element
inner barrel
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
EP97925061A
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German (de)
French (fr)
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EP0904481A1 (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
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Dresser Industries Inc
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Publication date
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Publication of EP0904481A1 publication Critical patent/EP0904481A1/en
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    • 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 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 axis longitudinal rotation.
  • the inner tube may be of a different material (for example of fiberglass coated with a binder) of that of the outer tube which is usually made of steel, the differential expansions that these two tubes undergo object to obtaining and / or maintaining a desired adjustment of the fluid passage.
  • a carrot entering the inner tube can grow this somewhat towards the top of the outer tube, in function of a clearance in the thrust ball or bearings with balls which connect the inner and outer tubes, and this can significantly change the above setting.
  • a bad adjusting said passage can lead for example to a too much core fluid flow to the core and to a possible deep alteration of it by washing, etc., or lead for example to contact too large between said surface of revolution of the free end member and the inner surface of the crown or outer tube, resulting in a seizure of these surfaces during the rotation of one relative to each other, or a deformation and / or rupture free end member, etc.
  • the object of the present invention is to remedy to the aforementioned drawbacks, and to others not explained above but known to those skilled in the art, and provide a means to obtain in a way safe and simple the right setting, even setting up a zero or near zero passage for the fluid of coring between the free end element of the tube interior and the corresponding internal bearing surface, without annoying pressure from one on the other, so without them aforesaid risks of seizure, deformation or rupture at this location.
  • the free end element is mounted in the core barrel so that it can slide coaxially over a section end of the inner tube, between a position in which the surface of revolution is in contact with the internal surface of the crown or of the tube respectively outside and an extreme position away from this internal surface.
  • the sliding free end element and the end section each have a cooperating stop with each other, when the inner tube is removed from its core position in the outer tube, so as to block the free end element on the end section in another position extreme located beyond said contact position in starting from the extreme position away from the surface internal.
  • Figure 1 shows schematically in axial section of a section of a corer equipped with the following the invention.
  • Figure 2 shows schematically, at another scale, in axial half-section a section of another corer equipped according to the invention.
  • the core barrel 1 of FIG. 1 presents a coring ring 2 mounted on an outer tube 3, intended inter alia for the rotational drive of the crown 2, and an inner tube 4 intended to receive a core 5 during a coring operation.
  • a split tapered ring 6 is provided in the tube interior 4 and is intended to block therein a carrot.
  • the inner 4 and outer 3 tubes are each formed of various sections of tubes attached one to the other for example by screwing and are practically coaxial.
  • the inner tube 4 has one end anterior free 7, considering the direction of travel of core sampler 1 during a core drilling operation.
  • This element free end 7 is delimited by a surface of revolution 8 arranged to cooperate with a surface internal 9 of the crown 2, or if necessary of the tube exterior 3 according to the reciprocal arrangement of these two components mounted one on top of or the other, so that adjust between the surface of revolution 8 and the surface internal 9 a determined passage of coring fluid.
  • the fluid of coring is brought into an annular conduit 10, delimited by the inner 4 and outer 3 tubes, way to get to the bottom of a core hole by via nozzles there from crown 2. It can be desired that a small amount of coring fluid can however pass directly from the conduit annular 10 to a gap 12 between a carrot 5 and the crown 2, so as to lubricate and cool this place of friction between these two components. The fluid flow to this gap must however be limited to prevent this fluid from damaging the carrot produced.
  • the free end element 7 is mounted in the core barrel 1 so that it can 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 a 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 surface internal 9 for supporting the surface of revolution 8.
  • the free end element 7 abuts against a surface internal 9 of the crown 2 and the end section 13 has another free end member 15 therein fixed and which in the coring position in the corer 1, can protrude from the end member free 7 sliding.
  • the sliding mounting can be adjusted to that the pressure of the coring fluid, acting on the surfaces of the free end element 7, press one against each other the surface of revolution 8 and the surface internal 9.
  • the pressing force can be considered as low given the small surface area or can present the free end element 7 at the fluid pressure.
  • This pressing force can however be increased by known hydraulic means (pressure losses for example and / or increase in flow) to prevent the free end member 7 either pushed upwards, for example by debris from carrot passing between the crown 2 and the section end 13.
  • the contact between the surfaces of revolution 8 and internal 9 can be continuous and the passage of fluid from the duct annular 10 towards the gap 12 is then practically closed.
  • Sliding free end element 7 can also be mounted so that it can be rotated the end section 13. This allows for example to distribute the wear due to friction during rotation of the outer tube 3 relative to the inner tube 4, between the contact point of the surfaces of revolution 8 and internal 9 and the contact point of the element free end 7 and end section 13, or well to report this wear to this last place which for example the components are removable and replaceable.
  • At least said section end 13 can be removably arranged on the rest of the inner tube 4.
  • Free end elements 7 and section end 13 can be made of materials different from those of the inner 4, outer 3 and crown 2 and be adapted according to the friction at undergo.
  • the free end member 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.
  • 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) located opposite said position of contact between surfaces of revolution 8 and internal 9 compared to the first extreme position mentioned, disposed away from the inner surface 9.
  • the end section 13 may include as a stop 20, on the bottom side well in the coring position, a collar external cylindrical 22 and, between this and the rest of the inner tube 4, a cylindrical body 23 of diameter external lower than the external cylindrical collar 22.
  • the free end element 7 then comprises, side of the same well bottom, a cylindrical hole 24 opening whose internal diameter is adapted to the outer diameter of the outer collar 22 for sliding above and, on the opposite side to the bottom of the well, in as a stop 21, an internal cylindrical collar 25 of which the internal diameter is less than that of the hole cylindrical 24 and is adapted to the external diameter of the cylindrical body 23 for said sliding.
  • the removable arrangement of the end section 13 on the rest of the inner tube 4 can be constituted by example by an external screw thread assembly on the end section 13, at its end away from the well bottom, and with internal thread on the end corresponding to the rest of the inner tube 4.
  • the external screw pitch 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 by example in the inner surface of the cylindrical collar internal 25 in order to cooperate with the peripheral surface of the cylindrical body 23 and thus improve a tightness to the coring fluid at this location.
  • the core barrel 1 of the invention comprises advantageously a tapered split ring 6, such as shown in Figure 1 and having a groove in V 33 where it is split, a cylindrical surface internal 34 roughened, in known manner, for hang a carrot 1 and a frustoconical surface external 35 grooved.
  • One or more notches 40 may be provided on one face of the free end element 7 turned towards the rest of the inner tube 3. These notches 40 can be used to take off, possibly by pressure of fluid, an element 7 relative to said remaining inner tube 3.
  • Notches 41 may be provided on the end face of the unscrewable end section 13, to receive a tool for screwing or unscrewing of this section 13.

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  • 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)
  • Earth Drilling (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Joints Allowing Movement (AREA)
  • Sampling And Sample Adjustment (AREA)

Description

La présente invention concerne un carottier, en particulier dans le domaine de la prospection pétrolière, comprenant :

  • une couronne de carottage,
  • un tube extérieur pour l'entraínement 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. Un carottier de ce genre est connu par le document GB 2 000 824 A.
The present invention relates to a core barrel, in particular in the field of oil exploration, comprising:
  • a core drilling core,
  • an outer tube for driving in rotation of the coring ring, and
  • an inner tube having a free anterior end element and 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 an internal surface of the latter, or if necessary of the outer tube, so as to regulate between them a determined passage of fluid coring. A corer of this kind is known from the document GB 2 000 824 A.

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 apparaítre dans un carottier en raison des températures variables 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 axis longitudinal rotation. Setting the passage of fluid is tricky, for example since the inner tube is attached to the outer tube to a large distance from the place of this passage and given large variations in length that may appear in a core barrel due to variable temperatures and high that it can undergo during coring. To date, the operator who assembles a corer is trying to get a correct setting for this passage, taking into account the length differences that show the different sections of the inner tubes and outside and taking into account the temperatures supposedly affected during coring. It is however known that practically the passage actually obtained can be too different from the target. In addition, the inner tube may be of a different material (for example of fiberglass coated with a binder) of that of the outer tube which is usually made of steel, the differential expansions that these two tubes undergo object to obtaining and / or maintaining a desired adjustment of the fluid passage. In addition, a carrot entering the inner tube can grow this somewhat towards the top of the outer tube, in function of a clearance in the thrust ball or bearings with balls 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 either case, a bad adjusting said passage can lead for example to a too much core fluid flow to the core and to a possible deep alteration of it by washing, etc., or lead for example to contact too large between said surface of revolution of the free end member and the inner surface of the crown or outer tube, resulting in a seizure of these surfaces during the rotation of one relative to each other, or a deformation and / or rupture free end member, 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 to the aforementioned drawbacks, and to others not explained above but known to those skilled in the art, and provide a means to obtain in a way safe and simple the right setting, even setting up a zero or near zero passage for the fluid of coring between the free end element of the tube interior and the corresponding internal bearing surface, without annoying pressure from one on the other, so without them aforesaid 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 that it can slide coaxially over a section end of the inner tube, between a position in which the surface of revolution is in contact with the internal surface of the crown or of the tube respectively outside and an extreme position away from this internal surface.

Dans une forme de réalisation de l'invention, l'élément d'extrémité libre coulissant et le tronçon d'extrémité comportent chacun une butée coopérant l'une avec l'autre, lorsque le tube intérieur est retiré de sa position de carottage dans le tube extérieur, 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 cooperating stop with each other, when the inner tube is removed from its core position in the outer tube, so as to block the free end element on the end section in another position extreme located beyond said contact position in starting from the extreme position away from the surface internal.

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'invention.Other details and peculiarities of the invention will emerge from the secondary claims and of the description of the drawings which are annexed to the present brief and which illustrate, by way of examples nonlimiting, 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 of a section of a corer equipped with the following 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.Figure 2 shows schematically, at 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 different figures, the same reference notations designate identical elements or the like. 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'entraínement 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 presents a coring ring 2 mounted on an outer tube 3, intended inter alia for the rotational drive of the crown 2, and an inner tube 4 intended to receive a core 5 during a coring operation. A split tapered ring 6 is provided in the tube interior 4 and is intended to block therein a carrot. The inner 4 and outer 3 tubes are each formed of various sections of tubes attached one to the other for example by screwing and are practically coaxial. The inner tube 4 has one end anterior free 7, considering the direction of travel of core sampler 1 during a core drilling operation. This element free end 7 is delimited by a surface of revolution 8 arranged to cooperate with a surface internal 9 of the crown 2, or if necessary of the tube exterior 3 according to the reciprocal arrangement of these two components mounted one on top of or the other, so that adjust between the surface of revolution 8 and the surface internal 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 il de la couronne 2. Il peut être souhaité qu'une petite quantité de fluide de carottage 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. In the case of FIG. 1, the fluid of coring is brought into an annular conduit 10, delimited by the inner 4 and outer 3 tubes, way to get to the bottom of a core hole by via nozzles there from crown 2. It can be desired that a small amount of coring fluid can however pass directly from the conduit annular 10 to a gap 12 between a carrot 5 and the crown 2, so as to lubricate and cool this place of friction between these two components. The fluid flow to this gap must however be limited to prevent this fluid from damaging the carrot produced.

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.To this end, and for the reasons stated above, the free end element 7 is mounted in the core barrel 1 so that it can 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 a extreme position away from this internal surface 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 embodiment of Figure 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 surface internal 9 for supporting 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'extrémité libre 7 coulissant.In the embodiment of Figure 2, the free end element 7 abuts against a surface internal 9 of the crown 2 and the end section 13 has another free end member 15 therein fixed and which in the coring position in the corer 1, can protrude from the end member free 7 sliding.

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 cependant 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.The sliding mounting can be adjusted to that the pressure of the coring fluid, acting on the surfaces of the free end element 7, press one against each other the surface of revolution 8 and the surface internal 9. The pressing force can be considered as low given the small surface area or can present the free end element 7 at the fluid pressure. This pressing force can however be increased by known hydraulic means (pressure losses for example and / or increase in flow) to prevent the free end member 7 either pushed upwards, for example by debris from carrot passing between the crown 2 and the section end 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).Following 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 duct annular 10 towards the gap 12 is then practically closed. One can however for example provide the element free end 7 of calibrated through holes (not shown) or calibrated notches (not shown) made in the surface of revolution 8 to leave pass a determined flow of fluid (depending on the pressure of 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 remplaçables.Sliding free end element 7 can also be mounted so that it can be rotated the end section 13. This allows for example to distribute the wear due to friction during rotation of the outer tube 3 relative to the inner tube 4, between the contact point of the surfaces of revolution 8 and internal 9 and the contact point of the element free end 7 and end section 13, or well to report this wear to this last place which 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 section end 13 can be removably arranged 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.Free end elements 7 and section end 13 can be made of materials different from those of the inner 4, outer 3 and crown 2 and be adapted according to the friction at undergo.

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 member 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. 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) located opposite said position of contact between surfaces of revolution 8 and internal 9 compared to the first extreme position mentioned, disposed away from the inner 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 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 coulissement.Advantageously, the end section 13 may include as a stop 20, on the bottom side well in the coring position, a collar external cylindrical 22 and, between this and the rest of the inner tube 4, a cylindrical body 23 of diameter external lower than the external cylindrical collar 22. The free end element 7 then comprises, side of the same well bottom, a cylindrical hole 24 opening whose internal diameter is adapted to the outer diameter of the outer collar 22 for sliding above and, on the opposite side to the bottom of the well, in as a stop 21, an internal cylindrical collar 25 of which the internal diameter is less than that of the hole cylindrical 24 and is adapted to the external diameter of the cylindrical body 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, qui est défini seulement par le jeu des revendications.It should be understood that the invention is not in no way limited to the embodiments described and that many modifications can be made to these latter without departing from the scope of the present invention, which is defined only by the set of claims.

Ainsi, dans le carottier suivant l'invention, 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.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 by example by an external screw thread assembly on the end section 13, at its end away from the well bottom, and with internal thread on the end corresponding to the rest of the inner tube 4. From preferably, the external screw pitch 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 by example in the inner surface of the cylindrical collar internal 25 in order to cooperate with the peripheral surface of the cylindrical body 23 and thus improve a tightness to 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.The core barrel 1 of the invention comprises advantageously a tapered split ring 6, such as shown in Figure 1 and having a groove in V 33 where it is split, a cylindrical surface internal 34 roughened, in known manner, for hang a carrot 1 and a frustoconical surface external 35 grooved.

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 pression du fluide, un élément 7 par rapport audit restant du tube intérieur 3.One or more notches 40 may be provided on one face of the free end element 7 turned towards the rest of the inner tube 3. These notches 40 can be used to take off, possibly by pressure of fluid, an element 7 relative to said remaining 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 dévissage de ce tronçon 13.Notches 41 may be provided on the end face of the unscrewable end section 13, to receive a tool for screwing or unscrewing of this section 13.

Claims (7)

  1. Core sampler, particularly in the field of oil prospecting, comprising:
    a core-sampling bit (2),
    an outer barrel (3) for rotating the sampling bit (2), and
    an inner barrel (4) which has a free front end element (7) and is intended to accommodate a core sample (5) during sampling, the inner (4) and outer (3) barrels being practically coaxial, and
    a surface of revolution (8) of the free end element (7), on the same side of the bit (2), designed to interact with an internal surface (9) of the latter, or, if appropriate, of the outer barrel (3), so as together to set a predetermined passage for core-sampling fluid,
        characterized in that the free end element (7) is mounted in the core sampler (1) in such a way that it can slide coaxially over an end portion (13) of the inner barrel (4), between a position in which the surface of revolution (8) is in contact with the internal surface (9) of the bit (2) or of the outer barrel (3), respectively, and an extreme position away from this internal surface (9).
  2. Core sampler according to Claim 1, characterized in that the sliding free end element (7) is mounted so that it can turn on the aforementioned end portion (13).
  3. Core sampler according to either of Claims 1 and 2, characterized in that the sliding free end element (7) and the end portion (13) each comprise a stop (20, 21), which stops interact with one another when the inner barrel (4) is withdrawn from its core-sampling position in the outer barrel (3), so as to lock the free end element (7) on the end portion (13) in another extreme position situated beyond the said contact position with respect to the extreme position away from the internal surface (9).
  4. Core sampler according to any one of Claims 1 to 3, ) characterized in that the said end portion (13) is designed so that it can be removed from the rest of the inner barrel (4).
  5. Core sampler according to Claim 4, characterized in that the end portion (13) comprises, by way of a stop (20), on the side that is towards the bottom of the well in the sampling position, an external cylindrical collar (22) and, between this and the rest of the inner barrel (4), a cylindrical body (23) of smaller outside diameter than that of the external cylindrical collar (22) and in that the free end element (7) comprises, on the same side as this same well bottom, an open-ended cylindrical hole (24), the inside diameter of which is adapted to the outside diameter of the external collar (22) for the purpose of the aforementioned sliding and, on the opposite side to the well bottom, by way of a stop (21), an internal cylindrical collar (25), the inside diameter of which is smaller than that of the cylindrical hole (24) and which is adapted to the outside diameter of the cylindrical body (23) with a view to the said sliding.
  6. Core sampler according to either of Claims 4 and 5, characterized in that the removable arrangement of the end portion on the rest of the inner barrel (4) consists of an assembly with an external screw thread on the end portion (13), on its end away from the well bottom, and an internal screw thread on the corresponding end of the rest of the inner barrel (4), in that, as a preference, the external screw thread has a diameter at most equal to the outside diameter of the cylindrical body (23) and in that, when the screw threads are cylindrical, they are advantageously left-hand threads.
  7. Core sampler according to any one of Claims 1 to 6, characterized in that it comprises hydraulic means designed to act on the free end element (7) so as to press the surface of revolution (8) onto 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 EP0904481A1 (en) 1999-03-31
EP0904481B1 true 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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Publication number Priority date Publication date Assignee Title
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
CN112901097B (en) * 2021-01-29 2023-06-30 陈建和 Mobile petroleum exploration equipment

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US1870592A (en) * 1931-05-21 1932-08-09 Schuerman Martin Core drill
GB1160409A (en) * 1966-09-28 1969-08-06 Mindrill Ltd Core Drills.
GB2000824B (en) * 1977-07-06 1982-05-19 American Coldset Corp Method and core barrel apparatus for obtaining and retrieving subterranean formation samples
US4512423A (en) * 1983-09-09 1985-04-23 Christensen, Inc. Coring device with an improved weighted core sleeve and anti-gripping collar
US4553613A (en) * 1983-09-09 1985-11-19 Norton Christensen, Inc. Hydraulic lift inner barrel in a drill string coring tool
US4643265A (en) * 1985-03-04 1987-02-17 Norton Christensen, Inc. Core barrel apparatus for disposing a core within a thin, flexible film casing
US4981183A (en) * 1988-07-06 1991-01-01 Baker Hughes Incorporated Apparatus for taking core samples

Also Published As

Publication number Publication date
BE1010325A3 (en) 1998-06-02
NO985641L (en) 1998-12-03
EP0904481A1 (en) 1999-03-31
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
DE69709638T2 (en) 2002-10-02

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