EP0244317B1 - Device for drilling wells with lateral branches - Google Patents

Device for drilling wells with lateral branches Download PDF

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Publication number
EP0244317B1
EP0244317B1 EP87400968A EP87400968A EP0244317B1 EP 0244317 B1 EP0244317 B1 EP 0244317B1 EP 87400968 A EP87400968 A EP 87400968A EP 87400968 A EP87400968 A EP 87400968A EP 0244317 B1 EP0244317 B1 EP 0244317B1
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EP
European Patent Office
Prior art keywords
extension unit
tubular element
union
wellhead
suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87400968A
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German (de)
French (fr)
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EP0244317A1 (en
Inventor
Jean-Pierre Parant
Christian Mariotti
Patrick Rousselet
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.)
Societe Nationale Elf Aquitaine Production SA
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Societe Nationale Elf Aquitaine Production SA
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Publication of EP0244317A1 publication Critical patent/EP0244317A1/en
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Publication of EP0244317B1 publication Critical patent/EP0244317B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0035—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock

Definitions

  • the present invention relates to improvements to drilling devices for branched wells or also called multidrain wells.
  • An elaborate technique of multidrain drilling consists of descending into the mother well of the deflection means, of fixing in situ the deflection means which generally comprise three deflection tubes arranged at 120 ° from one another, then selecting using connecting means one of the deflecting tubes from which it is desired to drill a drain or lateral branching.
  • Devices making it possible to implement such a technique are described in US Patents 4,396,075, 4,415,205 and in French Application No. 83 13 981.
  • any operation in the well or in one of the branched drains of the well requiring a displacement of the drill string involves also moving the selection means therefore all the organs which are integral with it. This is particularly so when changing the lining or the drilling tool which requires the withdrawal of the selection means, their separation from the drilling lining and then their replacement on the new drilling lining to descend into well.
  • the object of the present invention is to remedy the aforementioned drawbacks and to propose a device for drilling branched drains in which the drilling string is separated from the selection means, which also have a connection function in application FR 83 13981 (EP- A-0.136.935).
  • the present invention which is of the type comprising a device for drilling lateral drains from a cased mother well surmounted by a well head, said device comprising selection and connection means cooperating with fixed deflection means arranged in the mother well, is characterized in that the selection and connection means are mounted at the lower end of an extension formed by tubular elements joined to each other, and the upper end of which is integral with suspension means arranged in the well head, at least one sliding joint being interposed between two rods of the extension, the internal diameter of each of the rods elements of the extension being such that a drill string can be accommodated in said elements.
  • the present invention also makes it possible to obtain a better rise in the cuttings due to the reduction in the annular space following the use of an extension with an internal diameter slightly greater than that of the drill string.
  • the device according to the invention is intended to be lowered into a wellbore 1 which is shown diagrammatically, said well receiving suitable equipment and surmounted by a well head referenced in a way general by reference 2. Only the parts of the wellhead 2 included in the device according to the invention are shown partially in section in order to make clear the description which will be made later.
  • the device comprises selection and connection means 3 intended to cooperate with deflection means 4, shown diagrammatically, installed in a fixed manner in the well by any appropriate means, as indicated in the patents cited as being the prior art .
  • deflection means 4 shown diagrammatically, installed in a fixed manner in the well by any appropriate means, as indicated in the patents cited as being the prior art .
  • the structure of the deflection 4, selection and connection means 3 will not be described. We can usefully refer to the devices described in the prior art for all the construction details.
  • the selection and connection means 3 are mounted at the lower end of a tubular element 5, which element can be in one or more pieces as shown in FIG. 1.
  • the element 5 constitutes the lower part of an extension 50 consisting of a set of tubular elements; element 5 must give said extension a certain flexibility in bending in the vicinity of the selection and connection means 3, and thus facilitate the connection of the means 3 with the deflection means 4, for example when passing from a drain to a other.
  • the element 5 is connected to a first group of tubular elements 6a by means of a fitting of the appropriate type 7 in the event that the connections 5 and 6a are different.
  • the last upper element of a set of elements 6a when several of them are connected the to each other, is connected to another set of tubular elements 6b by means of a sliding joint 8 shown in detail in FIGS. 2 and 3.
  • the sliding joint 8 comprises an upper connector 9 provided with a thread 10 for assembly with a rod 6b, and a lower connector 11 provided with a thread 12 for assembly with a rod 6a.
  • the connector 9 is screwed by a part 9a inside one end of a tube 13 of diameter approximately equal to 24.5 cm, the other end of which is screwed on a part 14a of an intermediate connector 14 disposed between the tube 13 and the lower connector 11.
  • An inner tube 16 is housed in the tube 13, one end 16a being screwed into the lower connector 11 while the other end 16b is screwed into a piston 17.
  • the inner tube 16 comprises a guide key 18 which is capable of sliding in a corresponding groove formed in the intermediate connector 14, said key 18 being welded to the inner tube 16 by means of welding 19 ( Figure 3).
  • a guide key 18 which is capable of sliding in a corresponding groove formed in the intermediate connector 14, said key 18 being welded to the inner tube 16 by means of welding 19 ( Figure 3).
  • One or more orifices 20 are formed in the tube 13.
  • the piston 17 comprises a part 22 capable of sliding along the internal wall of the tube 13 and an annular rim 23 on which are arranged a support ring 24 and a sealing device 25 which is held in place by a ring 26 made integral with the piston 17 by means of screws 27.
  • the sliding seal 8 is shown in the closed state.
  • the lower connector 11 is displaced relative to the intermediate connector 14 which remains fixed since it is integral with the outer tube 13.
  • the movement to the left of the lower connector 11 causes the inner tube 16 and the piston 17 to move, the maximum displacement stroke is obtained when the free edge 17a of the piston 17 comes close to the end 14b of the part 14a of the intermediate connector 14.
  • Such a stroke of the piston 17 makes it possible to easily adjust the length of the extender to the distance existing between the wellhead 2 and the deflection means 4.
  • the set of elements 6b (FIG. 1) is extended by at least one tube 28 of internal diameter sufficient to allow the engagement of a square or hexagonal drive rod 61 of a drill string 60 while having sufficient clearance for the circulation of the mud, to limit the shocks between the square rod and the section 6b of the extender and reduce the incidence of a misalignment between the movable block and the rotation table.
  • a suspension olive 29 is mounted in a head 30 which is fixed to the upper end of a main casing 31, the head 30 resting on a flange 32 of a surface casing 33 by means of a support 34
  • the suspension olive 29 comprises an upper part 29a with a thread, a lower part 29b with a thread and an intermediate part 29c.
  • the upper part 29a is intended to receive a handling rod generally provided with a reduction in order to raise the surface of the whole olive 29-extension 50 and selection and connection means 3.
  • the tapping of the upper part 29a is protected by a net protector 35 provided with two J-shaped notches or any other quick reconnection system at its upper part to allow it to be put in place and picked up again.
  • the protective assembly of threads 35 and suspension olive 29 is held in place in the well head by needle screws 36.
  • Elements 5, 6a, 6b and 28 play the role of a usual extension called a riser by specialists.
  • connection means 3 When the selection and connection means 3 approach deflection means 4 to pass, for example, from one of the inlet orifices to another of the deflection means 4, the weight of the device is almost constant. When the connection means 3 are correctly in place, then there is a reduction in the measurable weight at the surface.
  • the positioning of the sliding joint at a given level in the extender makes it possible to avoid leaving too much of the extender part to work under compression and makes it possible to put a given weight on said connection means.
  • the tubular elements 5, 6a, 28 have an internal diameter of 12.7 cm, 16.85 cm, 17.8 cm respectively, while the tubes 13 and 16 have an equal internal diameter at 24.5cm and 17.8cm respectively.

Description

La présente invention concerne des perfectionnements aux dispositifs de forage de puits ramifié ou encore appelé puits multidrains.The present invention relates to improvements to drilling devices for branched wells or also called multidrain wells.

Depuis fort longtemps, on réalise des forages multidrains qui ne sont autres que des ramifications obtenues à partir d'un puits principal ou puits-mère.For a very long time, multidrain drilling has been carried out which are none other than ramifications obtained from a main well or mother well.

Une technique élaborée de forage multidrains consiste à descendre dans le puits-mère des moyens de déviation, à fixer in situ les moyens de déviation qui comportent généralement trois tubes de déviation disposés à 120° les uns des autres, puis à sélectionner à l'aide de moyens de raccordement un des tubes déviateurs à partir duquel on souhaite forer un drain ou ramification latérale. Des dispositifs permettant de mettre en oeuvre une telle technique sont décrits dans les brevets US 4 396 075, 4 415 205 et dans la demande française No. 83 13 981.An elaborate technique of multidrain drilling consists of descending into the mother well of the deflection means, of fixing in situ the deflection means which generally comprise three deflection tubes arranged at 120 ° from one another, then selecting using connecting means one of the deflecting tubes from which it is desired to drill a drain or lateral branching. Devices making it possible to implement such a technique are described in US Patents 4,396,075, 4,415,205 and in French Application No. 83 13 981.

Les dispositifs décrits, tout au moins dans les brevets US cités, impliquent que les moyens de sélection soient descendus avec la garniture de forage elle-même. De ce fait, toute opération dans le puits ou dans un des drains ramifiés du puits nécessitant un déplacement de la garniture de forage implique de déplacer également les moyens de sélection par conséquent tous les organes qui lui sont solidaires. Il en est notamment ainsi lors du changement de la garniture ou de l'outil de forage qui exige le retrait des moyens de sélection, leur séparation d'avec la garniture de forage puis leur remise en place sur la nouvelle garniture de forage à descendre dans le puits.The devices described, at least in the cited US patents, imply that the selection means are lowered with the drill string itself. Therefore, any operation in the well or in one of the branched drains of the well requiring a displacement of the drill string involves also moving the selection means therefore all the organs which are integral with it. This is particularly so when changing the lining or the drilling tool which requires the withdrawal of the selection means, their separation from the drilling lining and then their replacement on the new drilling lining to descend into well.

De plus, la mise en place dans un drain d'outils suspendus à des câbles tels que des outils de diagraphie est impossible avec les dispositifs décrits dans les brevets US déjà cités. En effet, à moins que les drains ne soient tubés et leur tubage ne remonte jusqu'à la surface, il est impossible d'entrer à nouveau dans un drain déterminé.In addition, the installation in a drain of tools suspended from cables such as logging tools is impossible with the devices described in the US patents already cited. Indeed, unless the drains are cased and their casing rises to the surface, it is impossible to re-enter a determined drain.

La présente invention a pour but de remédier aux inconvénients précités et de proposer un dispositif de forage des drains ramifiés dans lequel la garniture de forage est dissociée des moyens de sélection, lesquels ont aussi une fonction de raccordement dans la demande FR 83 13981 (EP-A-0.136.935).The object of the present invention is to remedy the aforementioned drawbacks and to propose a device for drilling branched drains in which the drilling string is separated from the selection means, which also have a connection function in application FR 83 13981 (EP- A-0.136.935).

La présente invention qui est du type comprenant un dispositif de forage de drains latéraux à partir d'un puits-mère tubé et surmonté d'une tête de puits, ledit dispositif comprenant des moyens de sélection et de raccordement coopérant avec des moyens de déviation fixes disposés dans le puits-mère, est caractérisée en ce que les moyens de sélection et de raccordement sont montés à l'extrémité inférieure d'un prolongateur constitué par des éléments tubulaires assemblés les uns aux autres, et dont l'extrémité supérieure est solidaire de moyens de suspension disposés dans la tête de puits, au moins un joint coulissant étant interposé entre deux tiges du prolongateur, le diamètre intérieur de chacun des tiges éléments du prolongateur étant tel qu'une garniture de forage puisse être logée dans lesdits éléments.The present invention which is of the type comprising a device for drilling lateral drains from a cased mother well surmounted by a well head, said device comprising selection and connection means cooperating with fixed deflection means arranged in the mother well, is characterized in that the selection and connection means are mounted at the lower end of an extension formed by tubular elements joined to each other, and the upper end of which is integral with suspension means arranged in the well head, at least one sliding joint being interposed between two rods of the extension, the internal diameter of each of the rods elements of the extension being such that a drill string can be accommodated in said elements.

Outre la possibilité maintenant offerte d'effectuer des opérations sur la garniture de forage tout en maintenant en place les moyens de sélection et de raccordement, la présente invention permet également d'obtenir une meilleure remontée des déblais de forage grâce à la diminution de l'espace annulaire consécutive à l'utilisation d'un prolongateur de diamètre intérieur légèrement supérieur à celui de la garniture de forage.In addition to the possibility now offered to carry out operations on the drill string while keeping the selection and connection means in place, the present invention also makes it possible to obtain a better rise in the cuttings due to the reduction in the annular space following the use of an extension with an internal diameter slightly greater than that of the drill string.

D'autres avantages et caractéristiques ressortiront mieux à la lecture de la description d'un mode de réalisation préféré de l'invention, donnée à titre indicatif mais non limitatif, ainsi que des dessins annexés sur lesquels :

  • la figure 1 est une vue en élévation partiellement coupée du dispositif selon l'invention ;
  • la' figure 2 est une vue en coupe du joint coulissant représenté sur la figure 1 ;
  • la figure 3 est une vue en coupe suivant III-III de la figure 2.
Other advantages and characteristics will emerge more clearly on reading the description of a preferred embodiment of the invention, given as an indication but not limiting, as well as the attached drawings in which:
  • Figure 1 is a partially cut elevation view of the device according to the invention;
  • the '2 is a sliding seal sectional view shown in Figure 1;
  • FIG. 3 is a sectional view along III-III of FIG. 2.

Le dispositif selon l'invention, tel que représenté sur la figure 1, est destiné à être descendu dans un puits de forage 1 qui est représenté schématiquement, ledit puits recevant un équipement approprié et surmonté d'une tête de puits référencé d'une façon générale par la référence 2. Seules les parties de la tête de puits 2 incluses dans le dispositif selon l'invention sont représentées partiellement en coupe afin de rendre claire la description qui sera faite ultérieurement.The device according to the invention, as shown in FIG. 1, is intended to be lowered into a wellbore 1 which is shown diagrammatically, said well receiving suitable equipment and surmounted by a well head referenced in a way general by reference 2. Only the parts of the wellhead 2 included in the device according to the invention are shown partially in section in order to make clear the description which will be made later.

Le dispositif comprend des moyens de sélection et de raccordement 3 destinés à coopérer avec des moyens de déviation 4, représentés schématiquement, installés de façon fixe dans le puits par tout moyen approprié, comme cela est indiqué dans les brevets cités comme étant l'art antérieur. De même, la structure des moyens de déviation 4, de sélection et de raccordement 3 ne seront pas décrits. On pourra utilement se reporter aux dispositifs décrits dans l'art antérieur pour connaître tous les détails de construction.The device comprises selection and connection means 3 intended to cooperate with deflection means 4, shown diagrammatically, installed in a fixed manner in the well by any appropriate means, as indicated in the patents cited as being the prior art . Likewise, the structure of the deflection 4, selection and connection means 3 will not be described. We can usefully refer to the devices described in the prior art for all the construction details.

Les moyens de sélection et de raccordement 3 sont montés à l'extrémité inférieure d'un élément tubulaire 5, lequel élément peut être en une ou plusieurs pièces comme cela est représenté sur la figure 1. L'élément 5 constitue la partie inférieure d'un prolongateur 50 constitué par un ensemble d'éléments tubulaires ; l'élément 5 doit conférer audit prolongateur une certaine souplesse en flexion au voisinage des moyens de sélection et de raccordement 3, et ainsi faciliter le raccordement des moyens 3 avec les moyens de déviation 4, par exemple lors du passage d'un drain à un autre. L'élément 5 est raccordé à un premier groupe d'éléments tubulaires 6a au moyen d'un raccord de type approprié 7 dans le cas où les connexions 5 et 6a seraient différentes. Le dernier élément supérieur d'un ensemble d'éléments 6a, lorsque plusieurs d'entre eux sont raccordés les uns aux autres, est raccordé à un autre ensemble d'éléments tubulaires 6b par l'intermédiaire d'un joint coulissant 8 représenté en détail sur les figures 2 et 3.The selection and connection means 3 are mounted at the lower end of a tubular element 5, which element can be in one or more pieces as shown in FIG. 1. The element 5 constitutes the lower part of an extension 50 consisting of a set of tubular elements; element 5 must give said extension a certain flexibility in bending in the vicinity of the selection and connection means 3, and thus facilitate the connection of the means 3 with the deflection means 4, for example when passing from a drain to a other. The element 5 is connected to a first group of tubular elements 6a by means of a fitting of the appropriate type 7 in the event that the connections 5 and 6a are different. The last upper element of a set of elements 6a, when several of them are connected the to each other, is connected to another set of tubular elements 6b by means of a sliding joint 8 shown in detail in FIGS. 2 and 3.

Le joint coulissant 8 comprend un raccord supérieur 9 muni d'un taraudage 10 pour l'assemblage avec une tige 6b, et un raccord inférieur 11 muni d'un filetage 12 pour l'assemblage avec une tige 6a. Le raccord 9 est vissé par une partie 9a à l'intérieur d'une extrémité d'un tube 13 de diamètre approximativement égal à 24,5 cm, dont l'autre extrémité est vissée sur une partie 14a d'un raccord intermédiaire 14 disposé entre le tube 13 et le raccord inférieur 11.The sliding joint 8 comprises an upper connector 9 provided with a thread 10 for assembly with a rod 6b, and a lower connector 11 provided with a thread 12 for assembly with a rod 6a. The connector 9 is screwed by a part 9a inside one end of a tube 13 of diameter approximately equal to 24.5 cm, the other end of which is screwed on a part 14a of an intermediate connector 14 disposed between the tube 13 and the lower connector 11.

Un tube intérieur 16 est logé dans le tube 13, une extrémité 16a étant vissée dans le raccord inférieur 11 tandis que l'autre extrémité 16b est vissée dans un piston 17. Le tube intérieur 16 comprend une clavette de guidage 18 qui est susceptible de coulisser dans une rainure correspondante ménagée dans le raccord intermédiaire 14, ladite clavette 18 étant soudée sur le tube intérieur 16 au moyen de soudure 19 (figure 3). A une relative courte distance de l'extrémité 14a du raccord intermédiaire 14, un ou plusieurs orifices 20 sont ménagés dans le tube 13. Le piston 17 comprend une partie 22 susceptible de coulisser le long de la paroi interne du tube 13 et un rebord annulaire 23 sur lequel sont disposés une bague d'appui 24 et un dispositif d'étanchéité 25 qui est maintenu en place par une bague 26 rendue solidaire du piston 17 au moyen de vis 27.An inner tube 16 is housed in the tube 13, one end 16a being screwed into the lower connector 11 while the other end 16b is screwed into a piston 17. The inner tube 16 comprises a guide key 18 which is capable of sliding in a corresponding groove formed in the intermediate connector 14, said key 18 being welded to the inner tube 16 by means of welding 19 (Figure 3). At a relatively short distance from the end 14a of the intermediate connector 14, one or more orifices 20 are formed in the tube 13. The piston 17 comprises a part 22 capable of sliding along the internal wall of the tube 13 and an annular rim 23 on which are arranged a support ring 24 and a sealing device 25 which is held in place by a ring 26 made integral with the piston 17 by means of screws 27.

Le joint coulissant 8 est représenté à l'état fermé. Pour le déploiement du joint, le raccord inférieur 11 est déplacé par rapport au raccord intermédiaire 14 qui reste fixe puisque solidaire du tube extérieur 13. Le déplacement vers la gauche du raccord inférieur 11 entraîne le déplacement du tube intérieur 16 et du piston 17, la course de déplacement maximale est obtenue lorsque le bord libre 17a du piston 17 vient à proximité de l'extrémité 14b de la partie 14a du raccord intermédiaire 14. Une telle course du piston 17 permet d'ajuster sans difficulté la longueur du prolongateur à la distance existant entre la tête de puits 2 et les moyens de déviation 4.The sliding seal 8 is shown in the closed state. For the deployment of the joint, the lower connector 11 is displaced relative to the intermediate connector 14 which remains fixed since it is integral with the outer tube 13. The movement to the left of the lower connector 11 causes the inner tube 16 and the piston 17 to move, the maximum displacement stroke is obtained when the free edge 17a of the piston 17 comes close to the end 14b of the part 14a of the intermediate connector 14. Such a stroke of the piston 17 makes it possible to easily adjust the length of the extender to the distance existing between the wellhead 2 and the deflection means 4.

L'ensemble des éléments 6b (figure 1) est prolongé par au moins un tube 28 de diamètre intérieur suffisant pour autoriser l'engagement d'une tige d'entraînement carrée ou hexagonale 61 d'une garniture de forage 60 tout en disposant d'un jeu suffisant pour la circulation de la boue, à limiter les chocs entre la tige carrée et la section 6b du prolongateur et diminuer l'incidence d'un défaut d'alignement entre le moufle mobile et la table de rotation.The set of elements 6b (FIG. 1) is extended by at least one tube 28 of internal diameter sufficient to allow the engagement of a square or hexagonal drive rod 61 of a drill string 60 while having sufficient clearance for the circulation of the mud, to limit the shocks between the square rod and the section 6b of the extender and reduce the incidence of a misalignment between the movable block and the rotation table.

Une olive de suspension 29 est montée dans une tête 30 qui est fixée à l'extrémité supérieure d'un tubage principal 31, la tête 30 reposant sur un rebord 32 d'un tubage de surface 33 par l'intermédiaire d'un support 34. L'olive de suspension 29 comprend une partie supérieure 29a taraudée, une partie inférieure 29b taraudée et une partie intermédiaire 29c. La partie supérieure 29a est destinée à recevoir une tige de manutention généralement munie d'une réduction afin de remonter en surface l'ensemble olive 29-prolongateur 50 et moyens de sélection et de raccordement 3. Pendant le forage, le taraudage de la partie supérieure 29a est protégé par un protecteur de filets 35 muni de deux encoches en J ou tout autre système de reconnexion rapide à sa partie supérieure afin de permettre sa mise en place et son repêchage. L'ensemble protecteur de filets 35 et olive de suspension 29 est maintenu en place dans la tête de puits par des vis pointeau 36.A suspension olive 29 is mounted in a head 30 which is fixed to the upper end of a main casing 31, the head 30 resting on a flange 32 of a surface casing 33 by means of a support 34 The suspension olive 29 comprises an upper part 29a with a thread, a lower part 29b with a thread and an intermediate part 29c. The upper part 29a is intended to receive a handling rod generally provided with a reduction in order to raise the surface of the whole olive 29-extension 50 and selection and connection means 3. During drilling, the tapping of the upper part 29a is protected by a net protector 35 provided with two J-shaped notches or any other quick reconnection system at its upper part to allow it to be put in place and picked up again. The protective assembly of threads 35 and suspension olive 29 is held in place in the well head by needle screws 36.

Les éléments 5, 6a, 6b et 28 jouent le rôle d'un prolongateur usuel appelé riser par les spécialistes.Elements 5, 6a, 6b and 28 play the role of a usual extension called a riser by specialists.

Lorsque les moyens de sélection et de raccordement 3 approchent des moyens de déviation 4 pour passer, par exemple, d'un des orifices d'entrée à un autre des moyens de déviation 4, le poids du dispositif est quasiment constant. Lorsque les moyens de raccordement 3 sont correctement en place, alors il se produit une diminution du poids mesurable en surface. Le positionne- 'ment du joint coulissant à un niveau donné dans le prolongateur permet d'éviter de laisser travailler une partie trop importante du prolongateur à la compression et permet de mettre un poids donné sur lesdits moyens de raccordement.When the selection and connection means 3 approach deflection means 4 to pass, for example, from one of the inlet orifices to another of the deflection means 4, the weight of the device is almost constant. When the connection means 3 are correctly in place, then there is a reduction in the measurable weight at the surface. The positioning of the sliding joint at a given level in the extender makes it possible to avoid leaving too much of the extender part to work under compression and makes it possible to put a given weight on said connection means.

Ainsi, lorsqu'un drain particulier est sélectionné par les moyens de sélection et de raccordement 3 dans un orifice correspondant des moyens de déviation 4, il devient possible de réaliser des diagraphies et des mesures au câble dès lors que les outils adéquats pour de telles mesures peuvent être introduits dans les différents éléments du dispositif selon l'invention. Une autre conséquence avantageuse est de permettre toute opération de contrôle de puits telle que perte ou venue dans le drain sélectionné sans aucune interférence avec les autres drains.Thus, when a particular drain is selected by the selection and connection means 3 in a corresponding orifice of the deflection means 4, it becomes possible to carry out logs and measurements with the cable as soon as the tools suitable for such measurements can be introduced into the various elements of the device according to the invention. Another advantageous consequence is to allow any well control operation such as loss or coming into the selected drain without any interference with the other drains.

Dans un exemple de réalisation du dispositif selon l'invention, les éléments tubulaires 5, 6a, 28 présentent un diamètre intérieur de 12,7cm, 16,85cm, 17,8cm respectivement, alors que les tubes 13 et 16 présentent un diamètre intérieur égal à 24,5cm et 17,8cm respectivement.In an exemplary embodiment of the device according to the invention, the tubular elements 5, 6a, 28 have an internal diameter of 12.7 cm, 16.85 cm, 17.8 cm respectively, while the tubes 13 and 16 have an equal internal diameter at 24.5cm and 17.8cm respectively.

Claims (10)

1. A device for drilling lateral boreholes from a cased parent well (1) surmounted by a wellhead (2), said device comprising selecting and coupling means (3) adapted to cooperate with stationarily fixed deflecting means (4) placed within the parent well ; characterized in that, said selecting means (3) are mounted at the lower end of an extension unit (50) constituted by tubular elements (5, 6a, 6b, 28) attached to each other ; suspension means (29) placed within the wellhead and to which is rididly fixed the upper end of said extension unit ; at least one slip joint (8) being interposed between two tubular elements (6a, 6b) of the extension unit (50), the internal diameter of each tubular element of said extension unit being such that a drilling packer (60) can be housed within said elements.
2. A device according to claim 1, wherein the extension unit (50) is constituted by tubular elements (5, 6a, 6b, 28) which usually have different diameters.
3. A device according to claim 2, wherein the tubular element (5) provided at the lower end of the extension unit (50) has a lower degree of rigidity than the reminder of said extension unit.
4. A device according to claim 2, wherein the tubular element is provided at the upper end of the extension unit (50), the internal diameter and length of said tubular element being sufficient to permit the passage of a kelly (61).
5. A device according to claim 1, wherein the slip joint is .interposed between two groups of tubular elements (6a, 6b).
6. A device according to claim 1, wherein the suspension means are constituted by a swivel hanger having a portion of smaller width (29b) in which the upper end of the tubular element (28) is mounted and a portion of greater width (29a) for receiving means whereby the assembly consisting of extension unit (50) and selecting and coupling means (3) is pulled up to the surface.
7. A device according to claim 6, wherein the portion of greater width (29a) of the suspension swivel (29) is protected by means of a protector (35) having two J-shaped recesses of any suitable rapid reconnection means.
8. A device according to claims 6 and 7, wherein the protector (35) and the suspension swivel (29) are held in position together within the wellhead (2) by means of cone-point set screws (36) rigidly fixed to the wellhead (2).
9. A device according to claims 6 to 8, wherein the suspension swivel (29) is housed within the head of the main wellhead casing (31).
10. A device according to claim 5, wherein the slip joint (8) comprises a fixed top union (9) adapted to receive the end of a tubular element (6a), a movable bottom union (11) on which a tubular element (6b) can be screwed, a fixed intermediate union (14) interposed between the bottom union (11) and an outer tube (13) to which said union is screwed at one end, the other end of said tube (13) being screwed on the top union (9), an inner tube (16) rigidly fixed at one end (16a) to the bottom union (11) and at the other end (16b) to a piston (17) slidably mounted within the outer tube (13) in leak-tight manner, said inner tube (16) being provided with a guide key (18), and orifices (20) formed in said outer tube (13).
EP87400968A 1986-04-30 1987-04-27 Device for drilling wells with lateral branches Expired EP0244317B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8606256A FR2598175B1 (en) 1986-04-30 1986-04-30 IMPROVEMENTS IN BRANCHED WELL DRILLING DEVICES
FR8606256 1986-04-30

Publications (2)

Publication Number Publication Date
EP0244317A1 EP0244317A1 (en) 1987-11-04
EP0244317B1 true EP0244317B1 (en) 1989-01-11

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EP87400968A Expired EP0244317B1 (en) 1986-04-30 1987-04-27 Device for drilling wells with lateral branches

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US (1) US4800966A (en)
EP (1) EP0244317B1 (en)
AU (1) AU586332B2 (en)
CA (1) CA1276624C (en)
DE (1) DE3760035D1 (en)
ES (1) ES2005195A6 (en)
FR (1) FR2598175B1 (en)
GB (1) GB2189828B (en)
IT (1) IT1203946B (en)
NO (1) NO177762C (en)
OA (1) OA08590A (en)

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US5715891A (en) 1995-09-27 1998-02-10 Natural Reserves Group, Inc. Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access
AU714721B2 (en) * 1996-07-15 2000-01-06 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
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US5833003A (en) * 1996-07-15 1998-11-10 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
AU719919B2 (en) * 1996-07-15 2000-05-18 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5862862A (en) * 1996-07-15 1999-01-26 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5813465A (en) * 1996-07-15 1998-09-29 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
CA2209958A1 (en) * 1996-07-15 1998-01-15 James M. Barker Apparatus for completing a subterranean well and associated methods of using same
CA2210563C (en) * 1996-07-15 2004-03-02 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
CA2210561C (en) * 1996-07-15 2004-04-06 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
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Also Published As

Publication number Publication date
FR2598175B1 (en) 1988-07-22
EP0244317A1 (en) 1987-11-04
AU7210287A (en) 1987-11-05
NO871788D0 (en) 1987-04-29
AU586332B2 (en) 1989-07-06
US4800966A (en) 1989-01-31
NO177762C (en) 1995-11-15
NO871788L (en) 1987-11-02
FR2598175A1 (en) 1987-11-06
GB2189828A (en) 1987-11-04
OA08590A (en) 1988-11-30
NO177762B (en) 1995-08-07
GB8710161D0 (en) 1987-06-03
DE3760035D1 (en) 1989-02-16
CA1276624C (en) 1990-11-20
GB2189828B (en) 1989-11-29
IT1203946B (en) 1989-02-23
IT8720209A0 (en) 1987-04-22
ES2005195A6 (en) 1989-03-01

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