EP0171335A1 - Drilling rod joint, especially for traversing the zones of lost circulation - Google Patents

Drilling rod joint, especially for traversing the zones of lost circulation Download PDF

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Publication number
EP0171335A1
EP0171335A1 EP85401608A EP85401608A EP0171335A1 EP 0171335 A1 EP0171335 A1 EP 0171335A1 EP 85401608 A EP85401608 A EP 85401608A EP 85401608 A EP85401608 A EP 85401608A EP 0171335 A1 EP0171335 A1 EP 0171335A1
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EP
European Patent Office
Prior art keywords
drill string
drilling pipe
insert
cylindrical
intermediate portion
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
EP85401608A
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German (de)
French (fr)
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EP0171335B1 (en
Inventor
André Dorleans
Georges Fermaud
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.)
Total Compagnie Francaise des Petroles SA
Original Assignee
Total Compagnie Francaise des Petroles SA
Compagnie Francaise des Petroles SA
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Application filed by Total Compagnie Francaise des Petroles SA, Compagnie Francaise des Petroles SA filed Critical Total Compagnie Francaise des Petroles SA
Publication of EP0171335A1 publication Critical patent/EP0171335A1/en
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Publication of EP0171335B1 publication Critical patent/EP0171335B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0078—Nozzles used in boreholes

Definitions

  • the present invention essentially relates to the drilling of a well through an area of land with loss of circulation.
  • this tool In the drilling of a well by a drilling tool mounted at the lower end of a drilling string used to apply a weight to this tool and to drive it in rotation, this tool receives by the bore of this stringing a drilling fluid whose role is at the same time to cool this tool, to clean the working face and to raise the cuttings to the surface by the annular space included between well and drilling rig.
  • This role of the drilling fluid is no longer adequately fulfilled if the well passes through an area with loss of circulation because the flow of the drilling fluid must then be reduced and the return to the surface of the circulation of the drilling fluid is poorly or not is not done at all. This results in a slowing down of the drilling operations and a risk of degradation of the wall portion of the well which may no longer be in contact with the drilling fluid.
  • US Patent 2,765,146 provides, at intervals along the drill string, passages between the interior and exterior of the drill string to direct upward into the annular space between the drill string and the wall of the well, a portion of the drilling fluid which flows from top to bottom in the drill string. This increases the rate of ascent of the drilling fluid in this annular space and reduces the pressure exerted by the drilling fluid on the formation, in order to avoid the invasion of the formation by debris which could disturb the future production of 'hydrocarbons and requiring an expensive and long cleaning.
  • communications are also created between the inside and the outside of the drill string, but to allow crossing of an area with loss of circulation and under conditions such that these communications are compatible with the power.
  • modern drilling pumps and do not have a destructive action on the wall of the well.
  • the invention relates to a drill string fitting which comprises a body elongated along a vertical axis, internally provided with an axial bore, forming externally, upper and lower cylindrical end portions provided at their free ends with screwing means for inserting the fitting into a drill string and comprising passages which, directed upwards, extend from the interior of the string drilling towards the outside thereof, characterized in that said elongated body comprises, between said end cylindrical portions, a swollen intermediate cylindrical portion, of outside diameter greater than the outside diameter of the upper end portion, which has a face upper connection to the upper end portion and which is provided with at least three recesses, each of which notches said upper face and at dyes said axial bore, distributed circumferentially at regular intervals from each other and in that, in each of these recesses, is inserted an insert, provided with an internal passage directed from bottom to top, opening at its lower part in said bore and opening vertically at its upper part by a nozzle located on a diameter
  • the drilling fluid is divided at the right of said internal passage into a first flow which follows the usual course: descent into the drilling string, passage over the drilling tool and back up into the annular space between the well and the drill string and in a second flow which passes through said internal passages and goes up directly into the annular space without causing scouring of the walls of the well.
  • this drill string fitting eliminates or at least considerably reduces the losses of the drilling fluid in circulation and makes it possible to cross zones with loss of circulation without slowing down the drilling operations and while maintaining a normal circulation of the drilling fluid.
  • this drill string connection acts as a stabilizer for the drill rods inside the drilled well due to the bulge of the intermediate cylindrical portion.
  • a drill string fitting comprises a one-piece body 1 which forms an upper cylindrical portion 2, a lower cylindrical portion 3 and an intermediate cylindrical portion 4 and which is provided with an axial bore 5.
  • These so-called cylindrical portions may be only substantially and have a low taper.
  • the upper 2 and lower 3 portions are provided at their free ends with female 6 and male 7 threads respectively, allowing the connection between an upper part 8 and a lower part 9 of drill string, as shown in FIG. 3.
  • the outside diameter of the intermediate portion 4 is larger than the outside diameter of the upper 2 and lower portions 3.
  • the portions 2 and 3 may have an outside diameter of 20.3 cm while the outer diameter of the portion 4 can be 28.6 cm.
  • the upper edge 10 formed on the upper perimeter of the intermediate portion 4 is connected to the upper portion 2 by a transition portion 11 which here has an outer surface of generally frustoconical shape and whose edge 10 constitutes the outer periphery.
  • Three recesses 12, 13, 14 are distributed in the portion 4 and the face 11 distributed circumferentially at equal distance as seen in FIG. 2 and removable inserts 15, 16, 17 are introduced into these recesses. treated, each held by at least one stud.
  • Two studs 18, 19 are provided here inserted into aligned holes of the insert and of the portion 4 and retained by screws such as the screw 20 visible in FIG. 2.
  • Each insert is traversed by an internal passage 21, visible in FIG. 1, which extends from a lower inlet 22 open in the bore 5 to an upper outlet 23 forming a nozzle and opening vertically upwards over a diameter included between the outer diameters of the upper portion 2 and of the intermediate portion respectively 4.
  • This nozzle 23 is itself an interchangeable tungsten carbide element added in the internal passage 21 and provided, in a conventional manner in itself, with a seal seal and a retaining circlip.
  • a seal 24 has also been inserted between the intermediate portion 4 and each insert 15, 16, 17.
  • a section 25 of the insert 15 has been given a cylindrical shape, 16 or 17 and to the recess part (12, 13, 14) which receives it, in a region close to the bore 5.
  • a threaded hole, blocked in operation by a screw 26, facilitates the positioning and the extraction of the added part 15, 16 or 17.
  • the inserts 15, 16, 17 reform the outer surface of the intermediate portion 4 but leave gaps in the connection portion delimited by the upper connection face 11 of frustoconical shape. These gaps are between two substantially radial surfaces. These radial surfaces provide protection from the faults 23.
  • a refill of a hard material such as tungsten carbide, on the one hand at 27 on what remains of the edge 10 after the execution of the recesses 12, 13, 14 and on the other hand at 28 on the upper edge of the radial surfaces which constitutes a leading edge according to the direction of rotation of the drill string.
  • Fig 3 we see the connector 1 mounted in a drill string above the drill rods 29 which carry the drilling tool 30. This drills a well 31 whose wall has a loss of circulation area 32. The circulation of drilling fluid is shown by arrows.
  • the fitting 1 is placed above the area with loss of circulation 32. Its action is all the more effective the closer it gets to this area, but it must never cross it. It will therefore be necessary to reassemble the drill string and give the fitting 1 a higher position when it arrives towards zone 32. This ascent operation will be carried out as many times as necessary for the drilling tool to reach the final dimension of drilling before installing a casing.
  • the distance between the fitting 1 and the drilling tool 30 will generally be greater than 150 m.
  • a connector 1 whose intermediate portion 4 has an outside diameter of 28.6 cm is suitable for a well of 44.3 cm in diameter for example. It can also be used in a narrower well, for example a 31.1 cm diameter well, but it is then preferable to use a fitting 1 provided, on the cylindrical surface of the intermediate portion, with helical grooves such as the grooves 33 shown in FIG. 1, facilitating the passage of the drilling fluid from bottom to top between the well and the intermediate portion 4.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Decoration Of Textiles (AREA)

Abstract

Ce raccord de garniture de forage comprend un corps alésé (1) muni d'un renflement central cylindrique (4) au sommet duquel on a pratiqué au moins trois évidements (12) pour y insérer des pièces amovibles (15, 17) munies d'un passage interne (21) dirigé de bas en haut et reliant l'alésage (5) à une duse (23) interchangeable montée dans ce passage et débouchant verticalement sur un diamètre compris entre le diamètre extérieur du renflement central (4) et celui de la portion supérieure (2) du corps. Ce raccord convient notamment à la traversée d'une zone à perte de circulation; il est alors placé au-dessus de cette zone.This drill string fitting comprises a reamed body (1) provided with a cylindrical central bulge (4) at the top of which at least three recesses (12) have been made for inserting removable parts (15, 17) provided therewith. an internal passage (21) directed from bottom to top and connecting the bore (5) to an interchangeable nozzle (23) mounted in this passage and opening vertically on a diameter between the external diameter of the central bulge (4) and that of the upper portion (2) of the body. This connection is particularly suitable for crossing an area with loss of circulation; it is then placed above this area.

Description

La présente invention concerne essentiellement le forage d'un puits à travers une zone de terrain à perte de circulation.The present invention essentially relates to the drilling of a well through an area of land with loss of circulation.

Dans le forage d'un puits par un outil de forage monté à l'extrémité inférieure d'une garniture de forage servant à appliquer un poids sur cet outil et à l'entraîner en rotation, cet outil reçoit par l'alésage de cette garniture un fluide de forage dont le rôle est à la fois de refroidir cet outil, de nettoyer le front de taille et de remonter les déblais à la surface par l'espace annulaire compris entre puits et garniture de forage.In the drilling of a well by a drilling tool mounted at the lower end of a drilling string used to apply a weight to this tool and to drive it in rotation, this tool receives by the bore of this stringing a drilling fluid whose role is at the same time to cool this tool, to clean the working face and to raise the cuttings to the surface by the annular space included between well and drilling rig.

Ce rôle du fluide de forage n'est plus rempli convenablement si le puits traverse une zone à perte de circulation car le débit du fluide de forage doit alors être réduit et le retour en surface de la circulation du fluide de forage se fait mal ou ne se fait pas du tout. Il en résulte un ralentissement des opérations de forage et un risque de dégradation de la portion de paroi du puits qui peut ne plus être en contact du fluide de forage.This role of the drilling fluid is no longer adequately fulfilled if the well passes through an area with loss of circulation because the flow of the drilling fluid must then be reduced and the return to the surface of the circulation of the drilling fluid is poorly or not is not done at all. This results in a slowing down of the drilling operations and a risk of degradation of the wall portion of the well which may no longer be in contact with the drilling fluid.

Le brevet des Etats-Unis d'Amèrique 2.765.146 prévoit, à intervalles le long de la garniture de forage, des passages entre l'intérieur et l'extérieur de la garniture de forage pour diriger, vers le haut dans l'espace annulaire compris entre la garniture de forage et la paroi du puits, une portion du fluide de forage qui circule de haut en bas dans la garniture de forage. On augmente ainsi la vitesse de remontée du fluide de forage dans cet espace annulaire et on réduit la pression exercée par le fluide de forage sur la formation, afin d'éviter l'invasion de la formation par des débris risquant de perturber la production future d'hydrocarbures et nécessitant un nettoyage coûteux et long.US Patent 2,765,146 provides, at intervals along the drill string, passages between the interior and exterior of the drill string to direct upward into the annular space between the drill string and the wall of the well, a portion of the drilling fluid which flows from top to bottom in the drill string. This increases the rate of ascent of the drilling fluid in this annular space and reduces the pressure exerted by the drilling fluid on the formation, in order to avoid the invasion of the formation by debris which could disturb the future production of 'hydrocarbons and requiring an expensive and long cleaning.

Mais ces passages, qui sont formés par de simples rainures, dirigées à la fois vers le haut et vers l'extérieur, dériveraient une grande partie du fluide de forage circulant dans la garniture de forage s'ils étaient utilisés avec les puissantes pompes de forage actuelles et, dirigés à la fois vers le haut et l'extérieur, provoqueraient une détérioration de la paroi du puits.But these passages, which are formed by simple grooves, directed both upwards and outwards, would divert a large part of the drilling fluid circulating in the drill string if they were used with the powerful drilling pumps current and, directed both upwards and outwards, would cause a deterioration of the well wall.

Selon la présente invention, on crée aussi des communications entre l'intérieur et l'extérieur de la garniture de forage, mais pour permettre la traversée d'une zone à perte de circulation et dans des conditions telles que ces communications soient compatibles avec la puissance des pompes modernes de forage et n'exercent pas d'action destructrice sur la paroi du puits.According to the present invention, communications are also created between the inside and the outside of the drill string, but to allow crossing of an area with loss of circulation and under conditions such that these communications are compatible with the power. modern drilling pumps and do not have a destructive action on the wall of the well.

Sans se limiter exclusivement à l'application constituée par la traversée d'une zone de circulation, l'invention a pour objet un raccord de garniture de forage qui comprend un corps allongé selon un axe vertical, muni intérieurement d'un alésage axial, formant extérieurement des portions cylindriques extrêmes supérieure et inférieure munies à leurs extrémités libres de moyens de vissage pour l'insertion du raccord dans une garniture de forage et comprenant des passages qui, dirigés vers le haut, s'étendent de l'intérieur de la garniture de forage vers l'extérieur de celle-ci, caractérisé en ce que ledit corps allongé comprend, entre lesdites portions cylindriques extrêmes, une portion cylindrique intermédiaire renflée, de diamètre extérieur plus grand que le diamètre extérieur de la portion extrême supérieure, qui présente une face supérieure de raccordement à la portion extrême supérieure et qui est pourvue d'au moins trois évidements, dont chacun entaille ladite face supérieure et atteint ledit alésage axial, répartis circonférentiellement à intervalles réguliers les uns des autres et en ce que, dans chacun de ces évidements, est insérée une pièce rapportée, munie d'un passage interne dirigé de bas en haut, ouvrant à sa partie inférieure dans ledit alésage et débouchant verticalement à sa partie supérieure par une duse située sur un diamètre compris entre le diamètre extérieur de ladite portion intermédiaire et le diamètre extérieur de ladite portion extrême supérieure.Without being limited exclusively to the application constituted by crossing a circulation area, the invention relates to a drill string fitting which comprises a body elongated along a vertical axis, internally provided with an axial bore, forming externally, upper and lower cylindrical end portions provided at their free ends with screwing means for inserting the fitting into a drill string and comprising passages which, directed upwards, extend from the interior of the string drilling towards the outside thereof, characterized in that said elongated body comprises, between said end cylindrical portions, a swollen intermediate cylindrical portion, of outside diameter greater than the outside diameter of the upper end portion, which has a face upper connection to the upper end portion and which is provided with at least three recesses, each of which notches said upper face and at dyes said axial bore, distributed circumferentially at regular intervals from each other and in that, in each of these recesses, is inserted an insert, provided with an internal passage directed from bottom to top, opening at its lower part in said bore and opening vertically at its upper part by a nozzle located on a diameter between the outside diameter of said intermediate portion and the outside diameter of said upper end portion.

Le diamètre extérieur de ladite portion intermédiaire étant, bien entendu, choisi inférieur au diamètre du puits foré, le fluide de forage se divise au droit dudit passage interne en un premier flux qui suit le parcours habituel : descente dans la garniture de forage, passage sur l'outil de forage et remontée dans l'espace annulaire compris entre le puits et la garniture de forage et en un deuxième flux qui passe dans lesdits passages internes et remonte directement dans l'espace annulaire sans provoquer d'affouillement des parois du puits.The outside diameter of said intermediate portion being, of course, chosen to be less than the diameter of the drilled well, the drilling fluid is divided at the right of said internal passage into a first flow which follows the usual course: descent into the drilling string, passage over the drilling tool and back up into the annular space between the well and the drill string and in a second flow which passes through said internal passages and goes up directly into the annular space without causing scouring of the walls of the well.

On a constaté que ce raccord de garniture de forage supprimait ou au moins réduisait considérablement les pertes du fluide de forage en circulation et permettait de traverser des zones à perte de circulation sans ralentir les opérations de forage et en conservant une circulation normale du fluide de forage. En outre, ce raccord de garniture de forage joue le rôle de stabilisateur des tiges de forage à l'intérieur du puits foré du fait du renflement de la portion cylindrique intermédiaire.It has been found that this drill string fitting eliminates or at least considerably reduces the losses of the drilling fluid in circulation and makes it possible to cross zones with loss of circulation without slowing down the drilling operations and while maintaining a normal circulation of the drilling fluid. . In addition, this drill string connection acts as a stabilizer for the drill rods inside the drilled well due to the bulge of the intermediate cylindrical portion.

De plus, en munissant ladite face supérieure de recharges en un matériau dur, on peut faire travailler le raccord de garniture de forage en aléseur agissant de bas en haut lors de la remontée de la garniture de forage, ce qui évite alors les coincements de celle-ci dans le puits foré.In addition, by providing said upper face with hard material refills, it is possible to work the drill string fitting in reamer acting from bottom to top during the ascent of the drill string, which then prevents jamming of that -this in the drilled well.

D'autres particularités de l'invention ressortiront d'un exemple de réalisation qui va être décrit à titre non limitatif en se référant au dessin joint dans lequel :

  • - la Fig 1 représente en demi-coupe axiale et en demi-élévation un raccord de garniture de forage ;
  • - la Fig 2 représente en vue de dessus avec coupe partielle, à plus grande échelle, ce raccord de garniture de forage ; et
  • - la Fig 3 représente en coupe verticale un tel raccord inséré dans une garniture de forage elle-même descendue dans un puits en cours de forage.
Other particular features of the invention will emerge from an exemplary embodiment which will be described without limitation with reference to the attached drawing in which:
  • - Fig 1 shows in axial half-section and in half-elevation a drill string fitting;
  • - Fig 2 shows a top view with partial section, on a larger scale, this drill string fitting; and
  • - Fig 3 shows in vertical section such a fitting inserted in a drill string itself lowered into a well being drilled.

Sur la Fig 1, un raccord de garniture de forage comprend un corps monobloc 1 qui forme une portion cylindrique supérieure 2, une portion cylindrique inférieure 3 et une portion cylindrique intermédiaire 4 et qui est muni d'un alésage axial 5. Ces portions dites cylindriques peuvent ne l'être que sensiblement et présenter une faible conicité. Les portions supérieure 2 et inférieure 3 sont pourvues à leurs extrémités libres de filetages respectivement femelle 6 et mâle 7 permettant le raccordement entre une partie supérieure 8 et une partie inférieure 9 de garniture de forage, comme on l'a représenté sur la Fig 3. Le diamètre extérieur de la portion intermédiaire 4 est plus grand que le diamètre extérieur des portions supérieure 2 et inférieure 3. Par exemple, les portions 2 et 3 peuvent avoir un diamètre extérieur de 20,3 cm tandis que le diamètre extérieur de la portion 4 peut être de 28,6 cm. L'arête supérieure 10 formée sur le périmètre supérieur de la portion intermédiaire 4 est reliée à la portion supérieure 2 par une portion de transition 11 qui présente ici une surface extérieure de forme générale tronconique et dont l'arête 10 constitue le pourtour extérieur.In FIG. 1, a drill string fitting comprises a one-piece body 1 which forms an upper cylindrical portion 2, a lower cylindrical portion 3 and an intermediate cylindrical portion 4 and which is provided with an axial bore 5. These so-called cylindrical portions may be only substantially and have a low taper. The upper 2 and lower 3 portions are provided at their free ends with female 6 and male 7 threads respectively, allowing the connection between an upper part 8 and a lower part 9 of drill string, as shown in FIG. 3. The outside diameter of the intermediate portion 4 is larger than the outside diameter of the upper 2 and lower portions 3. For example, the portions 2 and 3 may have an outside diameter of 20.3 cm while the outer diameter of the portion 4 can be 28.6 cm. The upper edge 10 formed on the upper perimeter of the intermediate portion 4 is connected to the upper portion 2 by a transition portion 11 which here has an outer surface of generally frustoconical shape and whose edge 10 constitutes the outer periphery.

On a ménagé dans la portion 4 et la face 11 trois évidements 12, 13, 14 répartis circonférentiellement à égale distance comme on le voit sur la Fig 2 et on a introduit dans ces évidements des pièces rapportées amovibles 15, 16, 17, en acier traité, tenues chacune par au moins un goujon. On a prévu ici deux goujons 18, 19 insérés dans des trous alignés de la pièce rapportée et de la portion 4 et retenus par des vis telles que la vis 20 visible sur la Fig 2.Three recesses 12, 13, 14 are distributed in the portion 4 and the face 11 distributed circumferentially at equal distance as seen in FIG. 2 and removable inserts 15, 16, 17 are introduced into these recesses. treated, each held by at least one stud. Two studs 18, 19 are provided here inserted into aligned holes of the insert and of the portion 4 and retained by screws such as the screw 20 visible in FIG. 2.

Chaque pièce rapportée est traversée par un passage interne 21, visible sur la Fig 1, qui s'étend d'une entrée inférieure 22 ouverte dans l'alésage 5 à une sortie supérieure 23 formant duse et débouchant verticalement vers le haut sur un diamètre compris entre les diamètres extérieurs respectivement de la portion supérieure 2 et de la portion intermédiaire 4. Cette duse 23 est elle-même un élément en carbure de tungstène interchangeable rapporté dans le passage interne 21 et muni, de manière en soi classique, d'un joint d'étanchéité et d'un circlip de retenue. On a également inséré un joint d'étanchéité 24 entre la portion intermédiaire 4 et chaque pièce rapportée 15, 16, 17. Pour faciliter la réalisation de cette liaison étanche , on a donné une forme cylindrique à un tronçon 25 de la pièce rapportée 15, 16 ou 17 et à la partie d'évidement, (12, 13, 14) qui le reçoit, dans une région proche de l'alésage 5. Un trou fileté, bouché en fonctionnement par une vis 26, facilite la mise en place et l'extraction de la pièce rapportée 15, 16 ou 17. Ainsi, il est possible, tout en conservant le même corps 1, de changer aussi bien les pièces rapportées 15, 16 et 17 que les duses 23 lorsque leur usure le nécessite.Each insert is traversed by an internal passage 21, visible in FIG. 1, which extends from a lower inlet 22 open in the bore 5 to an upper outlet 23 forming a nozzle and opening vertically upwards over a diameter included between the outer diameters of the upper portion 2 and of the intermediate portion respectively 4. This nozzle 23 is itself an interchangeable tungsten carbide element added in the internal passage 21 and provided, in a conventional manner in itself, with a seal seal and a retaining circlip. A seal 24 has also been inserted between the intermediate portion 4 and each insert 15, 16, 17. To facilitate the production of this sealed connection, a section 25 of the insert 15 has been given a cylindrical shape, 16 or 17 and to the recess part (12, 13, 14) which receives it, in a region close to the bore 5. A threaded hole, blocked in operation by a screw 26, facilitates the positioning and the extraction of the added part 15, 16 or 17. Thus, it is possible, while keeping the same body 1, to change both the added parts 15, 16 and 17 as well as the nozzles 23 when their wear requires it.

Les pièces rapportées 15, 16, 17 reforment la surface extérieure de la portion intermédiaire 4 mais laissent subsister des brèches dans la portion de raccordement délimitée par la face supérieure de raccordement 11 de forme tronconique. Ces brèches sont comprises entre deux surfaces sensiblement radiales. Ces surfaces radiales assurent la protection des duses 23. Pour permettre un certain reforage lors de la remontée de la garniture de forage, on a prévu une recharge en un matériau dur, tel que du carbure de tungstène, d'une part en 27 sur ce qui reste de l'arête 10 après l'exécution des évidements 12, 13, 14 et d'autre part en 28 sur le bord supérieur des surfaces radiales qui constitue un bord d'attaque d'après le sens de rotation de la garniture de forage.The inserts 15, 16, 17 reform the outer surface of the intermediate portion 4 but leave gaps in the connection portion delimited by the upper connection face 11 of frustoconical shape. These gaps are between two substantially radial surfaces. These radial surfaces provide protection from the faults 23. To allow a certain re-drilling during the ascent of the drill string, it is has provided a refill of a hard material, such as tungsten carbide, on the one hand at 27 on what remains of the edge 10 after the execution of the recesses 12, 13, 14 and on the other hand at 28 on the upper edge of the radial surfaces which constitutes a leading edge according to the direction of rotation of the drill string.

Sur la Fig 3, on voit le raccord 1 monté dans une garniture de forage au-dessus des masses-tiges 29 qui portent l'outil de forage 30. Celui-ci fore un puits 31 dont la paroi comporte une zone à perte de circulation 32. La circulation du fluide de forage est figurée par des flèches.In Fig 3, we see the connector 1 mounted in a drill string above the drill rods 29 which carry the drilling tool 30. This drills a well 31 whose wall has a loss of circulation area 32. The circulation of drilling fluid is shown by arrows.

Le raccord 1 est placé au-dessus de la zone à perte de circulation 32. Son action est d'autant plus efficace qu'il se rapproche de cette zone, mais il ne doit jamais la franchir. Il faudra donc remonter la garniture de forage et donner au raccord 1 une position plus élevée lorsque celui-ci arrivera vers la zone 32. Cette opération de remontée sera effectuée autant de fois que nécessaire pour que l'outil de forage atteigne la cote finale de forage avant installation d'un cuvelage. La distance entre le raccord 1 et l'outil de forage 30 sera généralement supérieure à 150 m.The fitting 1 is placed above the area with loss of circulation 32. Its action is all the more effective the closer it gets to this area, but it must never cross it. It will therefore be necessary to reassemble the drill string and give the fitting 1 a higher position when it arrives towards zone 32. This ascent operation will be carried out as many times as necessary for the drilling tool to reach the final dimension of drilling before installing a casing. The distance between the fitting 1 and the drilling tool 30 will generally be greater than 150 m.

Un raccord 1 dont la portion intermédiaire 4 présente un diamètre extérieur de 28,6 cm convient pour un puits de 44,3 cm de diamètre par exemple. Il peut aussi être utilisé dans un puits plus étroit, par exemple un puits de 31,1 cm de diamètre, mais il est alors préférable d'utiliser un raccord 1 muni, sur la surface cylindrique de la portion intermédiaire, de rainures hélicoïdales telles que les rainures 33 représentées sur la Fig 1, facilitant le passage du fluide de forage de bas en haut entre le puits et la portion intermédiaire 4.A connector 1 whose intermediate portion 4 has an outside diameter of 28.6 cm is suitable for a well of 44.3 cm in diameter for example. It can also be used in a narrower well, for example a 31.1 cm diameter well, but it is then preferable to use a fitting 1 provided, on the cylindrical surface of the intermediate portion, with helical grooves such as the grooves 33 shown in FIG. 1, facilitating the passage of the drilling fluid from bottom to top between the well and the intermediate portion 4.

Claims (8)

1 - Raccord de garniture de forage, qui comprend un corps (1) allongé selon un axe vertical, muni intérieurement d'un alésage axial (5) et formant extérieurement des portions cylindriques extrêmes supérieure (2) et inférieure (3) munies à leurs extrémités libres de moyens de vissage (6, 7) pour l'insertion du raccord dans une garniture de forage et comprenant des passages qui, dirigés vers le haut s'étendent de l'intérieur de la garniture de forage vers l'extérieur de celle-ci, caractérisé en ce que ledit corps allongé (1) comprend, entre lesdites portions cylindriques extrêmes (2,3), une portion cylindrique intermédiaire renflée (4) de diamètre extérieur plus grand que le diamètre extérieur de ladite portion cylindrique extrême supérieur (2), qui présente une face supérieure (11) de raccordement à la portion cylindrique extrême supérieure et qui est pourvue d'au moins trois évidements (12, 13, 14) dont chacun entaille ladite face supérieure (11) et atteint ledit alésage axial (5), répartis circonférentiellement à intervalles réguliers les uns des autres et en ce que, dans chacun de ces évidements (12, 13, 14), est insérée une pièce rapportée (15, 16, 17), munie d'un passage interne (21) dirigé de bas en haut, ouvrant à sa partie inférieure (22) dans ledit alésage (5) et débouchant verticalement à sa partie supérieure par une duse (23) située sur un diamètre compris entre le diamètre extérieur de ladite portion intermédiaire (4) et le diamètre extérieur de ladite portion supérieure (2).1 - Drilling pipe fitting, which comprises a body (1) elongated along a vertical axis, internally provided with an axial bore (5) and externally forming extreme upper (2) and lower (3) cylindrical portions provided at their free ends of screw means (6, 7) for inserting the fitting into a drill string and comprising passages which, directed upwards, extend from the interior of the drill string towards the exterior of that -ci, characterized in that said elongated body (1) comprises, between said extreme cylindrical portions (2,3), a swollen intermediate cylindrical portion (4) with an outside diameter larger than the outside diameter of said upper extreme cylindrical portion ( 2), which has an upper face (11) for connection to the upper extreme cylindrical portion and which is provided with at least three recesses (12, 13, 14) each of which notches said upper face (11) and reaches said axial bore (5), rep artis circumferentially at regular intervals from each other and in that, in each of these recesses (12, 13, 14), is inserted an insert (15, 16, 17), provided with an internal passage (21) directed from bottom to top, opening at its lower part (22) in said bore (5) and opening vertically at its upper part by a nozzle (23) located on a diameter between the outside diameter of said intermediate portion (4) and the outer diameter of said upper portion (2). 2 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que ladite face supérieure (11) est munie de recharges en un matériau dur (27, 28). '2 - Drilling pipe fitting according to claim 1, characterized in that said upper face (11) is provided with refills made of a hard material (27, 28). '' 3 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que ladite face supérieure (11) de raccordement de ladite portion intermédiaire (4) à ladite portion supérieure (2) présente une forme générale tronconique et en ce que chaque évidement (12, 13, 14) y forme une brèche comprise entre deux surfaces sensiblement radiales.3 - Drilling pipe connection according to claim 1, characterized in that said upper face (11) for connection of said intermediate portion (4) to said upper portion (2) has a generally frustoconical shape and in that each recess ( 12, 13, 14) forms a gap there between two substantially radial surfaces. 4 - Raccord de garniture de forage selon la revendication 3, caractérisé en ce que ledit corps (1) comporte des recharges en un matériau dur (27, 28) d'une part (27) sur ce qui reste du pourtour extérieur (10) de ladite face supérieure (11) après exécution des évidements (12, 13, 14) et d'autre part (28) sur le bord supérieur des surfaces radiales qui, d'après le sens de rotation de la garniture de forage, constitue un bord d'attaque.4 - Drilling pipe connection according to claim 3, characterized in that said body (1) comprises hard material refills (27, 28) on the one hand (27) on what remains of the outer periphery (10) of said upper face (11) after execution of the recesses (12, 13, 14) and on the other hand (28) on the upper edge of the radial surfaces which, according to the direction of rotation of the drill string, constitutes a leading edge. 5 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que la surface cylindrique de ladite portion intermédiaire (4) est munie de rainures hélicoïdales (33).5 - Filling fitting according to claim 1, characterized in that the cylindrical surface of said intermediate portion (4) is provided with helical grooves (33). 6 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que chaque pièce rapportée (15, 16, 17) est une pièce en acier traité amovible et tenue en place par au moins un goujon (18, 19) inséré dans des trous alignés de la pièce rapportée et de la portion intermédiaire (4) et lui-même retenu par une vis (20).6 - Drilling pipe fitting according to claim 1, characterized in that each insert (15, 16, 17) is a removable treated steel part and held in place by at least one stud (18, 19) inserted in aligned holes of the insert and the intermediate portion (4) and itself retained by a screw (20). 7 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que chaque duse (23) est un élément rapporté interchangeable en carbure de tungstène retenu par un circlip.7 - Drilling pipe fitting according to claim 1, characterized in that each nozzle (23) is an interchangeable insert made of tungsten carbide retained by a circlip. 8 - Raccord de garniture de forage selon la revendication 1, caractérisé en ce que chaque pièce rapportée (15, 16, 17) comporte un tronçon cylindrique (25) s'engageant dans une partie correspondante d'évidement (12, 13, 14) à proximité de l'alésage axial (5) et en ce qu'un joint d'étanchéité (24) est inséré autour de ce tronçon cylindrique (25).8 - drill string fitting according to claim 1, characterized in that each insert (15, 16, 17) has a cylindrical section (25) engaging in a corresponding recess part (12, 13, 14) near the axial bore (5) and in that a seal (24) is inserted around this cylindrical section (25).
EP85401608A 1984-08-08 1985-08-07 Drilling rod joint, especially for traversing the zones of lost circulation Expired EP0171335B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8412510A FR2568935B1 (en) 1984-08-08 1984-08-08 DRILL PIPE CONNECTION, PARTICULARLY FOR CROSSING A LOSS OF TRAFFIC AREA
FR8412510 1984-08-08

Publications (2)

Publication Number Publication Date
EP0171335A1 true EP0171335A1 (en) 1986-02-12
EP0171335B1 EP0171335B1 (en) 1988-03-23

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Application Number Title Priority Date Filing Date
EP85401608A Expired EP0171335B1 (en) 1984-08-08 1985-08-07 Drilling rod joint, especially for traversing the zones of lost circulation

Country Status (10)

Country Link
US (1) US4583603A (en)
EP (1) EP0171335B1 (en)
JP (1) JPH0643792B2 (en)
AU (1) AU554099B2 (en)
CA (1) CA1241944A (en)
DE (1) DE3561962D1 (en)
ES (1) ES295877Y (en)
FR (1) FR2568935B1 (en)
GB (1) GB2162881B (en)
NO (1) NO169187C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192217A (en) * 1986-07-02 1988-01-06 Total Petroles A well-drilling process
WO1997035092A1 (en) * 1996-03-19 1997-09-25 Ingersoll-Rand Company A removable guide member for guiding drill string components in a drill hole
CN100380499C (en) * 2004-09-13 2008-04-09 威盛电子股份有限公司 Method for collecting broadcast data file in single control chip
WO2016146241A1 (en) * 2015-03-15 2016-09-22 Herrenknecht Ag Drill string element

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170529A (en) * 1985-01-28 1986-08-06 2M Downhole Limited Improvements in or relating to drilling apparatus
US4817739A (en) * 1986-06-23 1989-04-04 Jeter John D Drilling enhancement tool
FR2603329B1 (en) * 1986-08-27 1988-11-25 Total Petroles STABILIZER FOR DRILLING LINING
DE4016965A1 (en) * 1990-05-25 1991-11-28 Ksk Guided Microtunneling Tech Drilling head for tunnel boring - has central channel with nozzles directed to front and rear
GB9211946D0 (en) * 1992-06-05 1992-07-15 Panther Oil Tools Uk Ltd Backreaming stabilizer
US5407020A (en) * 1993-04-26 1995-04-18 B.J.S. Systems, Inc. Pneumatic drilling chip removal system and method
US5392862A (en) * 1994-02-28 1995-02-28 Smith International, Inc. Flow control sub for hydraulic expanding downhole tools
GB9415500D0 (en) * 1994-08-01 1994-09-21 Stewart Arthur D Erosion resistant downhole diverter tools
US6868906B1 (en) 1994-10-14 2005-03-22 Weatherford/Lamb, Inc. Closed-loop conveyance systems for well servicing
NO302252B1 (en) * 1995-10-16 1998-02-09 Magne Hovden Flushing device for flushing upwards in the annulus between drill pipe and borehole wall in oil / gas / injection wells
US6536520B1 (en) 2000-04-17 2003-03-25 Weatherford/Lamb, Inc. Top drive casing system
US6837313B2 (en) 2002-01-08 2005-01-04 Weatherford/Lamb, Inc. Apparatus and method to reduce fluid pressure in a wellbore
GB9904380D0 (en) * 1999-02-25 1999-04-21 Petroline Wellsystems Ltd Drilling method
US6854533B2 (en) 2002-12-20 2005-02-15 Weatherford/Lamb, Inc. Apparatus and method for drilling with casing
US6896075B2 (en) * 2002-10-11 2005-05-24 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US6857487B2 (en) * 2002-12-30 2005-02-22 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US6164392A (en) * 1999-04-26 2000-12-26 Sandvik Ab Percussive drilling apparatus
WO2002010630A1 (en) * 2000-08-01 2002-02-07 Grant Prideco, L.P. Wear-resistant tool joint and drill pipe made therefrom
US7306042B2 (en) 2002-01-08 2007-12-11 Weatherford/Lamb, Inc. Method for completing a well using increased fluid temperature
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US6953096B2 (en) * 2002-12-31 2005-10-11 Weatherford/Lamb, Inc. Expandable bit with secondary release device
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7387176B2 (en) * 2004-05-08 2008-06-17 Mellott Joseph C Down hole air diverter
CA2538196C (en) 2005-02-28 2011-10-11 Weatherford/Lamb, Inc. Deep water drilling with casing
CA2651966C (en) 2006-05-12 2011-08-23 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing
US8905162B2 (en) * 2010-08-17 2014-12-09 Trendon Ip Inc. High efficiency hydraulic drill bit
CN104358525A (en) * 2014-09-12 2015-02-18 中国石油集团长城钻探工程有限公司 Rotation-prevention connecting structure for pipe column
CN105298406A (en) * 2015-09-24 2016-02-03 西南石油大学 Well drilling vortex nipple
EP4368809A1 (en) * 2022-11-10 2024-05-15 LMR Drilling GmbH Flushing device, in particular for installation in a drill string

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765146A (en) * 1952-02-09 1956-10-02 Jr Edward B Williams Jetting device for rotary drilling apparatus
US3566980A (en) * 1969-12-03 1971-03-02 Drilling Well Control Inc Underbalanced drilling sub
FR2417002A1 (en) * 1978-02-13 1979-09-07 Inst Francais Du Petrole BLADE STABILIZATION DEVICE CONTAINING AT LEAST ONE VENTURI-EFFECT SPACE AND USABLE IN PARTICULAR IN COMBINATION WITH A DRILLING TOOL
GB2096210A (en) * 1981-04-06 1982-10-13 Smith Int Drilco Div Stabilizers for borehole drilling apparatus
GB2127466A (en) * 1982-09-27 1984-04-11 Petroleum Instr Tech Services Apparatus for drilling oil wells

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908771A (en) * 1974-03-01 1975-09-30 Wylie P Garrett Drill collar incorporating device for jetting drilling fluid transversely into bore hole
FR2407336A1 (en) * 1977-10-27 1979-05-25 Petroles Cie Francaise REVERSE CIRCULATION DRILLING PROCEDURE WITH DEPRESSION EFFECT AND CIRCULATION REVERSE IN THE ROD TRAIN AND IMPLEMENTATION DEVICE
US4479558A (en) * 1981-08-05 1984-10-30 Gill Industries, Inc. Drilling sub
US4540055A (en) * 1983-06-10 1985-09-10 Drumco Drill bit assembly having improved operational life

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765146A (en) * 1952-02-09 1956-10-02 Jr Edward B Williams Jetting device for rotary drilling apparatus
US3566980A (en) * 1969-12-03 1971-03-02 Drilling Well Control Inc Underbalanced drilling sub
FR2417002A1 (en) * 1978-02-13 1979-09-07 Inst Francais Du Petrole BLADE STABILIZATION DEVICE CONTAINING AT LEAST ONE VENTURI-EFFECT SPACE AND USABLE IN PARTICULAR IN COMBINATION WITH A DRILLING TOOL
GB2096210A (en) * 1981-04-06 1982-10-13 Smith Int Drilco Div Stabilizers for borehole drilling apparatus
GB2127466A (en) * 1982-09-27 1984-04-11 Petroleum Instr Tech Services Apparatus for drilling oil wells

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192217A (en) * 1986-07-02 1988-01-06 Total Petroles A well-drilling process
FR2601065A1 (en) * 1986-07-02 1988-01-08 Total Petroles METHOD FOR DRILLING A WELL WITH LOCAL RELIEF OF THE PRESSURE OF THE DRILLING LIQUID.
GB2192217B (en) * 1986-07-02 1990-01-10 Total Petroles A well-drilling process
WO1997035092A1 (en) * 1996-03-19 1997-09-25 Ingersoll-Rand Company A removable guide member for guiding drill string components in a drill hole
CN100380499C (en) * 2004-09-13 2008-04-09 威盛电子股份有限公司 Method for collecting broadcast data file in single control chip
WO2016146241A1 (en) * 2015-03-15 2016-09-22 Herrenknecht Ag Drill string element
AU2016232638B2 (en) * 2015-03-15 2019-06-20 Herrenknecht Ag Drill string element
RU2696692C2 (en) * 2015-03-15 2019-08-05 Херренкнехт Аг Drill string element

Also Published As

Publication number Publication date
ES295877Y (en) 1987-12-16
DE3561962D1 (en) 1988-04-28
JPS6153991A (en) 1986-03-18
ES295877U (en) 1987-06-16
GB2162881B (en) 1987-11-18
AU554099B2 (en) 1986-08-07
GB8518104D0 (en) 1985-08-21
NO853118L (en) 1986-02-10
GB2162881A (en) 1986-02-12
US4583603A (en) 1986-04-22
AU4569885A (en) 1986-02-13
EP0171335B1 (en) 1988-03-23
CA1241944A (en) 1988-09-13
FR2568935B1 (en) 1986-09-05
NO169187C (en) 1992-05-20
NO169187B (en) 1992-02-10
JPH0643792B2 (en) 1994-06-08
FR2568935A1 (en) 1986-02-14

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