EP3663507A1 - Connector for assembling two sections of a riser with internal locking ring - Google Patents

Abstract

The present invention relates to a compact design of a connector by means of an internal locking ring (11). The connector according to the invention comprises a locking ring (11) allowing a bayonet-type connection on either side with two sections of riser. In addition, the connector comprises at least one removable pin (12) for locking the locking ring (11) in translation, in particular during locking and unlocking. For this, the removable pin (12) cooperates with the locking ring (11) by being arranged in a connector element (8, 9).

Description

Technical area

The present invention relates to the field of oil drilling and exploitation of deposits in very deep sea. It relates to a riser connector.

A riser (or riser) for drilling consists of a set of tubular elements of length generally between 15 and 27 m (50 and 90 feet), assembled by connectors. The tubular elements generally consist of a main tube provided with connectors at each end. Tubular auxiliary pipes also called peripheral pipes commonly called "kill line", "choke line", "booster line" and "hydraulic line" allowing the circulation of technical fluids are provided parallel to the main tube. The tubular elements are assembled on the drilling site, from a floating support. The column descends into the slice of water as the tubular elements are assembled, until reaching the wellhead located on the seabed.

With a view to drilling at water depths of up to 3500 m or more, the weight of the riser becomes very detrimental. This phenomenon is aggravated by the fact that, for the same maximum operating pressure, the length of the column imposes a larger internal diameter of the auxiliary pipes taking into account the need to limit the pressure losses.

Furthermore, the need to reduce the assembly time of the risers is all the more critical as the water depth, and therefore the length of the column, are important.

A riser (or riser) for other applications, in particular production, packaging (from English “completion”) or reconditioning (from English “work-over”), is also made up of a set of tubular elements assembled by connectors.

Prior art

The documents FR 2925105 , FR 2956693 and FR 2956694 describe various solutions proposing in particular to involve the auxiliary pipes, together with the main tube, in the resumption of the longitudinal forces applied to the riser. However, for the systems described in these patents, the attachment of the auxiliary lines relative to the main tube causes tensile forces in the auxiliary lines. In order to resist these tensile forces, the thicknesses of the auxiliary lines are large, which generates an increase in the mass, in the size of the floats and therefore in the cost of the riser. Another problem with these connectors concerns the inspection and maintenance of the locking ring. Indeed, the locking rings in the previously cited patents are not entirely removable. It is therefore not possible to inspect the entire locking ring.

To overcome this problem, patent applications WO 2015/071411 , WO 2015/169560 , WO 2015/169559 relate to connectors fitted with removable locking rings, thanks to two bayonet connections. However, these three connectors may require a particular arrangement of pins to prevent the simultaneous unlocking of the locking ring with the two riser sections.

The solution described in the patent application FR 3045708 (( WO 2017/102220 ) both facilitates inspection and maintenance of the locking ring, and prevents simultaneous disconnection of the locking ring thanks to removable pins. This type of locking ring is satisfactory, however, it is desirable to reduce the high number of components of the connector, reduce the cost of machining the components, and improve the seal. In fact, this solution may require a tubular sleeve used for fitting the male connector element into the female connector element and for centering the locking ring in the connector elements. This sleeve is an additional part, requiring machining and additional sealing as well as an additional step during assembly.

In order to overcome these drawbacks, the present invention relates to a compact design of a connector by means of an internal locking ring. The connector according to the invention comprises a locking ring allowing a bayonet-type connection on either side with two sections of riser. In addition, the connector has at least one removable pin to block the locking ring in translation, especially when locking and unlocking. For this, the removable pin cooperates with the locking ring by being arranged in a connector element. Thus, the connector according to the invention is removable, and the simultaneous disassembly of the ring with the two sections of riser is prevented. In addition, the locking ring has centering surfaces, in order to center the locking ring relative to the connector elements of the sections.

Summary of the invention

The present invention relates to a connector for assembling two riser sections, comprising a first main tube element extended by a first connector element, a second main tube element extended by a second connector element, a locking ring comprising a first and a second series of pins on its outer surface, said first and second connector elements respectively comprising on their inner surface a third and a fourth series of pins cooperating respectively with said first and second series of pins to connect said first and second main tube elements, said connector further comprising at least one removable pin. Said removable pin cooperates with said locking ring and is arranged in said first connector element to lock said locking ring in translation relative to said first connector element.

According to one embodiment, said locking ring is centered in said first and second connector elements by means of first and second centering surfaces respectively provided on said locking ring.

Preferably, said connector does not have a sleeve fixed to one of said first or second connector elements.

Advantageously, which said locking ring has first and second sealing surfaces arranged respectively in said first and second connector elements.

Advantageously, the inside diameter of said locking ring is substantially identical to the inside diameter of said first and second main tube elements.

According to one implementation, said connector comprises a cylindrical sleeve mounted in the first connector element.

Preferably, said cylindrical sleeve comprises a bearing surface in contact with one end of said locking ring.

According to one aspect, said locking ring is symmetrical relative to a median plane of said locking ring perpendicular to the axis of said locking ring.

According to one characteristic, said removable pin cooperates with a lug of said first series of lugs of said locking ring in the unlocked position of said locking ring.

Advantageously, said removable pin has a flat surface for cooperating with said pin of said first series of pins of said locking ring.

According to one embodiment, said removable pin is arranged in an orifice of said first connector element.

Advantageously, said removable pin has a keying device.

According to one implementation, said connector comprises means for locking in rotation of said locking ring.

Preferably, said means for locking in rotation of said locking ring comprises a system with an indexing finger, said indexing finger preferably being radial or axial.

According to one embodiment, said connector comprises means for blocking the rotation of said first and second connector elements.

Preferably, said means for locking in rotation of said first and second connector elements comprise two stops on each connector element, a stop of a connector element cooperating with a stop of the other connector element.

Advantageously, said indexing finger of said means for locking in rotation of the locking ring is integrated in a stop of said means for locking in rotation of said first and second connector elements.

According to one aspect, the studs of said first and second series of studs protrude over identical angular ranges.

According to one characteristic, said first and second connector elements are respectively provided with a flange for the respective passage of a first and a second auxiliary tube element.

In addition, the invention relates to a riser comprising at least two sections of riser assembled by a connector according to one of the preceding characteristics.

In addition, the invention relates to the use of a riser according to the preceding characteristic for carrying out a drilling or reconditioning operation for wells or production at sea.

Other characteristics and advantages of the connector according to the invention will appear on reading the description below of nonlimiting examples of embodiments, with reference to the appended figures and described below.

List of Figures

• [ Fig 1 ]
  The figure 1 shows a riser according to the invention.
• [ Fig 2 ]
  The figure 2 illustrates a connector according to a first alternative embodiment of the invention.
• [ Fig 3 ]
  The figure 3 illustrates a connector element according to an embodiment of the invention.
• [ Fig 4 ]
  The figure 4 illustrates a locking ring according to an embodiment of the invention.
• [ Fig 5 ]
  The figure 5 illustrates steps for unlocking a connector according to an embodiment of the invention.
• [ Fig 6 ]
  The figure 6 illustrates means for locking in rotation the connector elements according to a first embodiment of the invention.
• [ Fig 7 ]
  The figure 7 illustrates means for blocking the locking ring in rotation according to a first embodiment.
• [ Fig 8 ]
  The figure 8 illustrates means for locking in rotation the connector elements according to a second embodiment of the invention.
• [ Fig 9 ]
  The figure 9 illustrates means for blocking the locking ring in rotation according to a second embodiment.
• [ Fig 10 ]
  The figure 10 illustrates means for blocking the locking ring in rotation according to a third embodiment.
• [ Fig 11 ]
  The figure 11 illustrates a connector according to a second variant embodiment of the invention.

Description of the embodiments

According to a nonlimiting exemplary embodiment, the figure 1 shows a riser 1 for drilling installed at sea. The riser 1 extends the well P and extends from the wellhead 2 to a floating support 3, for example a platform or a boat. The wellhead 2 is provided with a shutter commonly called "BOP" or "Blow Out Preventer". The riser 1 is constituted by the assembly of several sections 4 assembled end to end by connectors 5. Each section is composed of a main tube element 6 provided with at least one auxiliary pipe element 7, also called pipe peripheral. Several auxiliary lines are generally used. Among them, there are notably "kill line", "choke line", "booster line" and "hydraulic line" lines. The auxiliary lines called "kill line" or "choke line" are used to ensure the safety of the well during the procedures for controlling the inflow of pressurized fluids into the well. The "choke" line is a safety line conveying fluids (oil, water, gas) coming from the well during an arrival and directing them towards the blast manifold and the torch. The "kill" line is a safety line which allows heavy fluids and cements to be injected into the well to stop an otherwise uncontrollable eruption. The auxiliary line called "booster line" allows the injection of mud into the well in order to increase its ascent rate and avoid the sedimentation of the cuttings; it is also used to replace the mud contained in the riser with water before disconnection. The so-called "hydraulic line" is used to control the shutter of the wellhead. Hydraulic lines supply the BOP safety devices (valves and accumulators) in hydraulic fluid (distilled water loaded with glycol) under pressure.

The section 4 comprises a main tube element 6 whose axis constitutes the axis of the riser. The auxiliary tubes 7 constitute auxiliary lines or conduits arranged parallel to the axis of the main tube. The auxiliary tube elements 7 have lengths substantially equal to the length of the main tube element 6, generally between 10 and 30 meters. At least one line 7 is arranged at the periphery of the main tube.

A connector 5 shown in the figure 1 consists of two connector elements (not shown). The connector elements are mounted at the ends of the main tube element 6. The connector elements are integral with the elements of the main tube 6, for example by welding, screwing, crimping or binding by jamming. The assembly of a connector element of a section 4 with a connector element of another section 4 forms the connector 5 which transmits forces from a riser section to the next section, in particular the longitudinal forces to which the riser.

• un premier élément de tube principal prolongé par un premier élément connecteur, celui-ci peut être éventuellement muni de moyens de guidage (par exemple une première bride) pour le passage d'un élément de tube auxiliaire (cas où la colonne montante comporte au moins une ligne auxiliaire),
• un deuxième élément de tube principal prolongé par un deuxième élément connecteur, celui-ci peut être éventuellement muni de moyens de guidage (par exemple une deuxième bride) pour le passage d'un élément de tube auxiliaire (cas où la colonne montante comporte au moins une ligne auxiliaire),
• éventuellement, un premier élément de tube auxiliaire passant dans la première bride,
• éventuellement, un deuxième élément de tube auxiliaire passant dans la deuxième bride,
• une bague de verrouillage, dite bague de verrouillage interne, située à l'intérieur des éléments connecteurs, la bague de verrouillage comprenant, sur sa face extérieure, une première série et une deuxième série de tenons aptes à coopérer avec une troisième série et une quatrième série de tenons disposées respectivement sur des surfaces intérieures des premiers et deuxièmes éléments connecteurs, pour connecter le premier et le deuxième éléments de tube principal, et
• au moins un pion démontable, le pion démontable coopérant avec la bague de verrouillage, et étant agencé dans le premier élément connecteur pour bloquer la bague de verrouillage en translation par rapport au premier élément connecteur, le pion démontable peut coopérer notamment avec un tenon de la première série de tenons de la bague de verrouillage ou tout autre élément prévu sur la bague de verrouillage.

The connector according to the invention is suitable for a drilling riser, for example as described in relation to the figure 1 , but the connector according to the invention can also be adapted to a riser for packaging (from the English "completion"), from reconditioning (from the English for "work-over") or for production, which has in particular the particularity not to have an auxiliary line. According to the invention, the connector comprises:

• a first main tube element extended by a first connector element, this can optionally be provided with guide means (for example a first flange) for the passage of an auxiliary tube element (case where the riser comprises at least an auxiliary line),
• a second main tube element extended by a second connector element, this can optionally be provided with guide means (for example a second flange) for the passage of an auxiliary tube element (case where the riser comprises at least an auxiliary line),
• optionally, a first auxiliary tube element passing through the first flange,
• optionally, a second auxiliary tube element passing through the second flange,
• a locking ring, called the internal locking ring, located inside the connector elements, the locking ring comprising, on its external face, a first series and a second series of pins capable of cooperating with a third series and a fourth series of pins arranged respectively on the inner surfaces of the first and second connector elements, for connecting the first and the second main tube elements, and
• at least one removable pin, the removable pin cooperating with the locking ring, and being arranged in the first connector element to block the locking ring in translation relative to the first connector element, the removable pin can cooperate in particular with a lug of the first set of pins of the locking ring or any other element provided on the locking ring.

Thus, thanks to the four series of pins, two bayonet type connections are formed: a first between the locking ring and the first connector element, a second between the locking ring and the second connector element. In this way, the locking ring is made removable with respect to the connector elements, which allows its inspection and maintenance. In addition, the bayonet connections allow rapid locking and unlocking of the connector.

The placement of the ring inside the two connector elements makes it possible to reduce the size of the connector, and thus brings compactness to the connector.

In addition, the arrangement of the removable pin (in the first connector element and cooperating with the pins of the locking ring) makes it possible to avoid having a component inside the locking ring to ensure the locking function. in translation of the locking ring relative to the first connector element. In the patent application FR 3045708 (( WO 2017/102220 ), this function is carried out by a pin passing through the locking ring and penetrating into a groove or an orifice of the male connector element, which may include a sleeve.

The connector can be designed and dimensioned to meet the specifications mentioned by API 16 R and API 2RD standards published by the American Petroleum Institute.

The various embodiments described above and below can be combined, so as to combine their effects.

According to one embodiment of the invention, the locking ring can also comprise, on its external surface, a first and a second centering surface. The first centering surface is intended to center the locking ring in the first connector element, and the second centering surface is intended to centering the locking ring in the second connector element. Thus, the locking ring fulfills both the locking function and the centering function. In this way, the connector does not comprise any additional element ensuring in particular the centering function, in particular, no sleeve fixed to a connector element. In other words, no sleeve is useful for the connector, which makes it possible to limit the number of components of the connector, which limits the machining of the components and which simplifies the assembly of the connector. In addition, this design of the connector makes it possible to have a thicker ring, thus limiting the mechanical stresses and / or the outside diameter of the connector and providing better rigidity during connection. In addition, this configuration of the locking ring makes it possible to use identical connector elements, which also simplifies the manufacture of the components. Preferably, the centering surfaces can be formed by cylindrical surfaces. Advantageously, the centering surfaces can be located at the longitudinal ends of the locking ring. This maximum distance makes it possible to optimize the centering.

According to one aspect of this embodiment of the invention, the locking ring may have, on its outer surface, a first and a second sealing surface. The first sealing surface is intended to seal between the locking ring and the first connector element, and the second sealing surface is intended to seal between the locking ring and the second connector element. Preferably, the sealing surfaces can be arranged between the centering surfaces and the series of studs. In other words, for this embodiment, the external surface of the locking ring can comprise, in the longitudinal direction, a first centering surface, a first sealing surface, a first series of studs, a second series of studs. , a second sealing surface and a second centering surface. Preferably, the sealing surfaces are cylindrical surfaces. Advantageously, the outside diameter of the sealing surfaces is greater than the diameter of the centering surfaces. Seals can be provided in grooves of the connector elements, the seals are then in contact with the sealing surfaces of the locking ring. Alternatively, seals can be provided in grooves of the locking ring at the sealing surfaces, the seals are then in contact with the inner surface of the connector elements.

According to an implementation of this embodiment of the invention (rings with centering surfaces), the internal diameter of the locking ring can be substantially identical to the internal diameter of the first and second connector elements, themselves having a diameter substantially identical to the diameters of the first and second main tube elements. This implementation makes it possible to avoid pressure drops in the main tube thanks to a substantially constant internal diameter of the main tube.

Alternatively, the connector may include a cylindrical sleeve. The cylindrical sleeve can be mounted on one of the connector elements (for example the first connector element), and can be inserted in the other connector element (for example the second connector element). The locking ring is then placed around the sleeve. The cylindrical sleeve can be assembled to the first connector element by bolting, screwing, shrinking, circlip or any similar means. Alternatively, the cylindrical sleeve can rest on the upper bearing surface of the locking ring. In other words, the cylindrical sleeve can rest on the axial end of the locking ring which is inserted in the first connector element. According to an exemplary embodiment, a shoulder can be provided on the outer surface of the sleeve to generate a bearing surface. The cylindrical sleeve also allows in particular the functions of centering and sealing.

According to one embodiment of the invention, the tenons of the first and second series of tenons (and a fortiori of the third and fourth series of tenons) are projecting over identical angular ranges. Called angular range of a tenon, the angle formed by the portion of disc occupied by the tenon on the diameter in which it is registered. For example, if a series of tenons has tenons which each represent one sixth of a disc, then the angular range of the tenon is 60 °. Thus, thanks to this design, the locking and unlocking of the locking ring with respect to the two connector elements can result from a single rotation and becomes simultaneous. In this way, the locking ring is only rotated between two angular positions.

According to a first implementation of the invention, the circumferential distributions of the first and second series of pins are symmetrical with respect to a radial plane passing between the two series of pins. In other words, the tenons of the first and second series of tenons face each other (are aligned). Thus, the locking ring can be symmetrical relative to a median plane of the locking ring, the plane being perpendicular to the axis of the locking ring. This symmetrical design allows in particular to simplify the assembly, and the manufacture of the locking ring. According to a second implementation of the invention, the circumferential distributions of the first and second series of tenons are opposite: the circumferential distribution of the second series of tenons is offset with respect to the first series of tenons, by an angle corresponding to the angular range of a post. In other words, the tenons of one series face the intervals of the other series. According to a third implementation of the invention, the circumferential distributions of the tenons of the first and second series are offset with respect to each other by an angle corresponding to half the angular range of a tenon (or any other angle).

Alternatively, the tenons of the first and second series of tenons (and a fortiori of the third and fourth series of tenons) are projecting over different angular ranges. Thus the unlocking of the two bayonet connections is achieved by separate rotations.

Preferably, the locking ring can be made in one piece.

The removable pin (s) has the function of supporting the weight of the locking ring in the unlocked position. Preferably, they are installed during assembly and are only removed during inspection.

Advantageously, for which the removable pin is intended to be in contact with a lug of the locking ring, the removable pin may have a flat surface for cooperating with a lug of the locking ring. Thus, the contact is facilitated, which allows blocking in simple translation.

Advantageously, the removable pin can be arranged in an orifice of the connector element. The orifice is preferably radial. The orifice can be located between the flange and the end of the first connector element, which faces the second connector element.

In addition, in order to facilitate the insertion and positioning of the removable pin, the removable pin may include a keying device. In other words, the removable pin includes a specific shape allowing the removable pin to be correctly positioned.

According to one embodiment of the invention, the locking means comprise a plurality of removable pins. Thus, it is possible to distribute the forces on the removable pins. For this embodiment, a number of removable pins can be provided corresponding to the number of pins of the third series or the fourth series of tenons (a fortiori of the first or third series of tenons). Alternatively, a number of removable pins can be provided, corresponding substantially to half the number of pins of the third or fourth series of pins. This alternative makes it possible to obtain a compromise between the number of pawns and the forces exerted on the pawns.

According to an embodiment of the invention, each series of studs can comprise at least one row of studs. A row of studs is called a circumferential distribution of studs. In each row of studs, there is an alternation of protruding studs and empty spaces (intervals), these empty spaces allow the passage of the corresponding studs from the series of studs with which the row of studs cooperates.

In accordance with an implementation of the invention, the series of tenons can comprise a plurality of rows of tenons, in particular two or three rows of tenons. The plurality of rows of tenons allows a reduction of the axial forces on the tenons, which makes it possible to limit the mechanical fatigue of the tenons.

According to a possible design, each series of studs has a single row of studs. According to a first alternative, each series of studs has two rows of studs. According to a second alternative, each series of studs has three rows of studs. According to a third alternative, two of the four sets of studs have a row of studs, and the other two series have two rows of studs. According to a fourth alternative, two of the four sets of studs have two rows of studs, and the other two series have three rows of studs.

In the case where a series of studs has several rows of studs, then the rows of studs can be entered in different diameters. This design allows the row of studs of smaller diameter to pass, and thus, it is possible to lock and unlock the bayonet connection by a single rotation.

In the case where a series of tenons comprises several rows of tenons, then the rows of tenons can be entered in identical diameters. This design requires insertion and locking of the bayonet connection by a relative movement composed of a first translation, a first rotation, a second translation and a second rotation. This design therefore allows better security of the connection because it avoids unwanted disconnection.

Each row of studs has a plurality of studs distributed regularly over a diameter. Advantageously, the tenons of the different rows can be arranged to allow 360 ° locking. According to one design, the rows of studs may include three studs having an angular range of 60 °, or 40 °. Alternatively, the rows of studs can include four studs with an angular range of 45 °, or 30 °. According to an alternative, the rows of studs can comprise five studs having an angular range of 36 °, or 24 °. According to another alternative, the rows of tenons can comprise six tenons having an angular range of 30 ° or 20 °. Alternatively, the rows of studs may include eight studs having an angular range of 22.5 °, or 15 °. In order to have the studs projecting over identical angular ranges, all the rows of all the series of studs can have the same number of studs.

In addition, in accordance with a connector design, the ring may include means for blocking the rotation of the connector elements, for example stops. For this embodiment, the means for locking in rotation of the locking ring may comprise two stops on each connector element, the stops of the first connector element cooperating with the stops of the second connector element. On one of the connector elements, the stops can have substantially the shape of an L, preferably an elongated L, and on the other connector element, the stops can substantially have the shape of a T, preferably a T whose vertical bar is of dimension equivalent to half of the horizontal bar of the T. Each pair of stops in cooperation makes it possible to prohibit a direction of rotation of the connector elements. For example, the vertical bar of the T of the stops of the first connector element comes into contact with the small part of the L of the stops of the second connector element. Alternatively, the stops can take other forms, such as right angles, concave and convex surfaces, etc.

Advantageously, the stops can be removable. This solution allows quick and economical replacement during maintenance as well as the use of identical connector elements. In this case, they can be fixed by screws on the connector elements. Alternatively, the stops are machined in the flanges of the connector elements. This alternative can also allow the use of identical connector elements.

According to a characteristic of the invention, the connector can comprise means for blocking the locking ring in at least one position, in particular in the locked position. These blocking means can also make it possible to prevent the rotation of the locking ring relative to the first connector element in the unlocked position. The locking ring locking means make it possible to avoid any unwanted unlocking of the locking ring.

According to an example of this embodiment, the means for locking in rotation of the locking ring may comprise a system with an indexing finger (that is to say a pin inserting into an orifice when it is in the locked position). The indexing finger can be axial or radial. The advantage of such a system is that it is automatic.

In accordance with an implementation of the invention, the system can combine the two variants described above. The indexing finger of the means for locking in rotation of the locking ring can be inserted into one of the stops of the means for locking in rotation of the connector elements. This combination makes it possible to integrate the two locking means into one another, which limits the number of components, and which facilitates maintenance and inspection operations.

According to a design of the invention, the locking ring can comprise handling means which are external to the locking ring. These manipulation means make it possible to rotate the locking ring. For example, the handling means can be a handling bar. According to one design, the handling means can be inserted in a removable pin.

According to one embodiment, the locking ring is a single piece, which simplifies the design and assembly of the connector.

The figure 2 illustrates, schematically and without limitation, a connector according to a first alternative embodiment of the invention, the connector assembles two sections of riser. The figure 2 corresponds to a section view of the connector. In this figure, only one side of the sectional view is shown, the second side can be deduced by axial symmetry. The axis of the sections and of the connector is shown horizontally. In this figure, the flanges for the auxiliary tube elements are shown, but are not necessary for the connector according to the invention. A first connector element 8 is connected to a second connector element 9. Locking means produce and lock the assembly. The locking means comprise a locking ring 11. The locking ring 11 comprises, on its outer surface, a first series of pins 15 and a second series of pins 16. The first series of pins 15 cooperates with a third series of pins 17, arranged on the inner surface of the first connector element 8. The second series of pins 16 cooperates with a fourth series of pins 18 , arranged on the inner surface of the second connector element 9. In addition, the locking means comprise at least one removable pin 12. The removable pin 12 cooperates with the locking ring 11. The removable pin 12 is inserted in the first connector element 8 so as to project from the inner part of the first connector element 8. The locking ring 11 also has two centering surfaces 13 and 14 at the longitudinal ends of the locking ring 11. The first centering surface 13 allows the centering of the locking ring 11 relative to the first connector element 8. The second centering surface 14 allows the centering of the locking ring 11 by relative to the second connector element 9. In addition, the locking ring 11 has two sealing surfaces 19 and 20, these sealing surfaces 19 and 20 are located between the centering surfaces 13 and 14 and the series of tenons 15 and 16.

The figure 3 illustrates, schematically and without limitation, in a sectional view, a connector element 8 or 9 for the embodiment of the figure 2 . The connector element 8 or 9 is a substantially cylindrical part, comprising a first end 22, intended to be fixed to a main tube element (not shown). The connector element 8 or 9 comprises, on its inner face, a third series of tenons constituted by two rows of tenons 17A and 17B. Row 17A is the most center row of the connector. According to the illustrated embodiment, each row of tenons 17A, 17B comprises four tenons having an angular range of 45 °. The two rows of tenons 17A, 17B are inscribed in different diameters. In this way, insertion and locking into the locking ring (and inversely unlocking and removal) are allowed by a single translation. In addition, the circumferential distributions of the studs of rows 17A, 17B are alternated: the studs of row 17A face (are aligned with) intervals between two studs of row 17B and vice versa. In a nonlimiting manner, this figure schematically represents the shape of the flange which allows the passage of an auxiliary tube element. In addition, the connector element 8 or 9 includes internal bores for respectively receiving the centering and sealing surfaces of the locking ring.

The figure 4 illustrates, schematically and without limitation, a locking ring 11 for the embodiment of the figure 2 . The locking ring 11 is a substantially cylindrical part. The locking ring 11 has, on its outer surface, a first series of tenons 15 and a second series of tenons 16. The first series of tenons 15 is able to cooperate with the third series of tenons of the first connector element. The second series of pins 16 is able to cooperate with the fourth series of pins of the second connector element. According to the illustrated embodiment, each series of tenons 15, 16 comprises two rows of tenons 15A, 15B and 16A, 16B. Rows 15A and 16A are the most center tenon rows. Each row of studs has four studs with an angular range of 45 °. In the example illustrated, the tenons of the rows of central tenons 15A, 16A are inscribed in diameters smaller than the diameters of the rows of external tenons 15B, 16B. In addition, the circumferential distributions of the studs in rows 15A, 15B are alternated: the studs in row 15A face (are aligned with) intervals between two studs in row 15B and vice versa. In the same way, the circumferential distributions of the studs of rows 16A, 16B are alternated: the studs of row 16A face (are aligned with) intervals between two studs of row 16B and vice versa. In addition, for the illustrated embodiment, the circumferential distributions of the tenons of the first and third series are symmetrical with respect to a radial plane situated between the first and third series of tenons: the tenons of row 15A face each other (are aligned with ) to the studs in row 16A, and the studs in row 15B face (are aligned with) the studs in row 16B. The locking ring 11 also has at these ends two cylindrical centering surfaces 13, 14 and possibly two cylindrical sealing surfaces (not shown), the sealing surfaces being arranged respectively between one of the centering surfaces 13 or 14 and a series of tenons 15 or 16.

The figure 6 illustrates, schematically and in a nonlimiting manner, two assembled connector elements equipped with means for locking in rotation of the connector elements according to a first embodiment of the locking means. The right part of the figure 6 is an enlargement of the means for blocking the rotation of the connector elements. The first connector element 8 comprises, on its outer surface and at its end, two stops 23 and 24. The stops 23 and 24 have substantially the shape of a T, the vertical bar of which has a dimension similar to half the length of the horizontal bar of the T. The stops 23 and 24 can be removable: they are fixed by screws to the first connector element 8. The second connector element 9 has, on its outer surface and at its end, two stops 25 and 26. The stops 25 and 26 have substantially the shape of an elongated L. The stops 25 and 26 can be arranged in opposite positions. The stops 25 and 26 are removable: they are fixed by screws to the second connector element 9. The stop 23 cooperates with the stop 25 to block rotation in a direction of rotation (clockwise). The stop 24 cooperates with the stop 26 to block rotation in the opposite direction of rotation (trigonometric direction). The contact surfaces of the stops 23, 24, 25 and 26 (in the illustrated case, it is the vertical bar of the T and the short side of L) protruding from the connector elements 8 and 9 in their axial direction, at the interval between the two connector elements 8 and 9, which makes part of the external surface of the locking ring 11 accessible.

The figure 7 illustrates, schematically and in a nonlimiting manner, two assembled connector elements equipped with means for locking in rotation of the locking ring according to a first alternative embodiment. The right part of the figure 7 is an enlargement of the means for blocking the locking ring in rotation. The first connector element 8 comprises, on its outer surface and at its end, two supports 27 and 30 for indexing fingers 28 and 31. For the illustrated embodiment, the indexing fingers 28 and 31 have a radial direction. The indexing fingers 28 and 31 are intended to penetrate holes provided on a support of the locking ring 11, such as the orifice 29. The supports 27 and 30 are removable: they are fixed by screws to the first element connector 8. The supports 27 and 30 project from the connector element 8 in its axial direction, at the interval between the two connector elements 8 and 9, which makes part of the outer surface of the ring accessible. lock 11.

The figure 7 illustrates means for locking in rotation of the locking ring independent of the means for locking in rotation of the connector elements. However, the locking means of the locking ring can be integrated into the locking means of the connector elements. In this case, the supports 27 and 30 can correspond to the stops 23 and 24, in which orifices can be provided for the passage of the indexing fingers 28 and 31. In this case, the orifices can be provided in the vertical bar of the T shape of the stops 23 and 24.

The figure 8 illustrates, schematically and in a nonlimiting manner, two assembled connector elements equipped with means for locking in rotation of the connector elements according to a second embodiment of the means for locking in rotation of the connector elements. The right part of the figure 8 is an enlargement of the means for blocking the rotation of the connector elements. The first connector element 8 comprises, on its outer surface and at its end, two stops 36 and 38. The stops 36 and 38 project in the axial direction of the first connector element 8. The second connector element 9 has, on its surface outer and at its end, two stops 35 and 39. The stops 35 and 39 protrude in the axial direction of the second connector element 9. The stop 35 cooperates with the stop 36 to block rotation in a direction of rotation (clockwise ). The stop 38 cooperates with the stop 39 to block rotation in the opposite direction of rotation (trigonometric direction). The contacting surfaces of the stops 35, 36, 38, 39 project from the connector elements 8 and 9 in their axial direction, at the level of the gap between the two connector elements 8 and 9, which makes part of the external surface of the locking ring 11 accessible. According to an exemplary embodiment and as illustrated, a removable pin 12 can be provided above d '' a projection 36 or 38.

The figure 9 illustrates, diagrammatically and in a nonlimiting manner, two assembled connector elements equipped with means for blocking the rotation of the locking ring integrated in a means for blocking the rotation of the connector elements according to a second variant embodiment. The right part of the figure 9 is an enlargement of the means for blocking the locking ring in rotation. The means for locking in rotation of the connector elements correspond to those described with reference to the figure 8 . The first connector element 8 comprises, on its outer surface and at its end, two stops 36 and 38. The stops 36 and 38 project in the axial direction of the first connector element 8. The second connector element 9 has, on its surface outer and at its end, two stops 35 and 39. The stops 35 and 39 protrude in the axial direction of the second connector element 9. In addition, the stops 36 and 38 of the first connector element 8 form two finger supports indexing 28 and 31: the stops 36 and 38 have orifices for the passage of the indexing fingers 28 and 31. For the illustrated embodiment, the indexing fingers 28 and 31 have a radial direction. The indexing fingers 28 and 31 are intended to penetrate orifices provided on a support 25 of the locking ring 11, such as the orifice 29. According to an exemplary embodiment and as illustrated, a removable pin 12 can be provided above a projection 36 or 38.

According to an alternative of the figure 10 , the connector may comprise means for locking in rotation of the disjointed locking ring means for locking in rotation of the connector elements, or the connector may comprise only means for locking in rotation of the locking ring. In these two cases, the first connector element comprises two axial projections at its end, into which two indexing fingers 33 are inserted.

The figure 10 illustrates, schematically and without limitation, means for blocking the locking ring in rotation according to a second alternative embodiment. The second connector element 9 comprises, on its outer surface and at its end, a support 32 for indexing finger 33. The indexing finger 33 has an axial direction. The indexing finger 33 is intended to penetrate into an orifice of a support 34 fixed on the locking ring 11. The supports 32 and 34 are removably fixed by screwing.

The figure 10 illustrates means for locking in rotation of the locking ring independent of the means for locking in rotation of the connector elements. However, blocking means of the locking ring can be integrated in the blocking means of the connector elements. In this case, the support 32 can correspond to the stop 25, in which an orifice can be provided for the passage of the indexing finger 33.

The figure 11 illustrates, schematically and without limitation, a connector according to a second variant embodiment of the invention. The figure 11 corresponds to a section view of the connector. In this figure, the flanges for the auxiliary tube elements are shown, but are not necessary for the connector according to the invention. A first connector element 8 is connected to a second connector element 9. Locking means produce and lock the assembly. The locking means comprise a locking ring 11. The bayonet connections (with the series of pins) between the locking ring 11 and the connector elements 8 and 9 are identical to those of the figure 2 and are not described in detail. In addition, the locking means comprise at least one removable pin 12. The removable pin 12 cooperates with the locking ring 11. The removable pin 12 is inserted in the first connector element 8 so as to project from the inner part of the first connector element 8. The connector further comprises a cylindrical sleeve 40. The cylindrical sleeve 40 is inserted in the connector elements 8 and 9. The cylindrical sleeve 40 has an internal diameter substantially identical to the internal diameters of the connector elements 8 and 9, for limit pressure losses. The locking ring 11 is arranged around the cylindrical sleeve 40. In addition, the cylindrical sleeve has a shoulder 41, which serves as a bearing surface between the cylindrical sleeve and an axial end of the locking ring 11.

In addition, the present invention relates to a riser, comprising at least two sections of riser assembled by a connector as described above. The connector can be produced according to any one of the combinations of the embodiments described above: plurality of removable pins, plurality of rows of tenons, rows of tenons inscribed on identical or distinct diameters, means for locking the rotation of the ring locking, means for locking the connector elements in rotation, locking ring provided with sealing surfaces, symmetry of the locking ring, etc.

Furthermore, the present invention relates to the use of such a riser (with any of the combinations of embodiments previously described) for perform a drilling operation at sea, to produce an oil effluent at sea, for a reconditioning operation ("work-over") ...

1. a) on insère la bague de verrouillage dans un premier élément connecteur, ainsi le premier élément de tube principal est positionné dans la bague de verrouillage sans être verrouillé ;
2. b) on insère au moins un pion démontable dans le premier élément connecteur jusqu'à venir en contact avec un tenon de la bague de verrouillage, ainsi le premier élément de tube principal est positionné dans la bague de verrouillage, en étant bloqué en translation, et possède encore un mouvement de rotation, il n'est donc pas verrouillé ;
3. c) on insère la bague de verrouillage dans le deuxième élément connecteur, ainsi le deuxième élément de tube principal est positionné dans la bague de verrouillage sans être verrouillé ; et
4. d) on verrouille la bague de verrouillage, par rotation de la bague de verrouillage, cette rotation unique verrouille les deux éléments connecteurs qui n'ont plus de mouvements relatifs par rapport à la bague de verrouillage.

Furthermore, the present invention relates to a method of assembling two column sections by means of a connector according to the invention. For this process, the following steps can be implemented:

1. a) the locking ring is inserted into a first connector element, thus the first main tube element is positioned in the locking ring without being locked;
2. b) at least one removable pin is inserted into the first connector element until it comes into contact with a lug of the locking ring, thus the first main tube element is positioned in the locking ring, being blocked in translation, and still has a rotational movement, so it is not locked;
3. c) the locking ring is inserted into the second connector element, thus the second main tube element is positioned in the locking ring without being locked; and
4. d) the locking ring is locked, by rotation of the locking ring, this single rotation locks the two connector elements which no longer have relative movements relative to the locking ring.

For step d), during locking, the rotation of the ring generates the respective cooperation of the first and third series of studs, and of the second and fourth series of studs. The rotation allowing the simultaneous locking of the two bayonet type connections is a rotation of an angle corresponding to the angular range of the studs. For example if the studs have an angular range of 36 °, then the locking rotation is a rotation of 36 °.

For step b), the blocking in axial translation of the first main tube element relative to the locking ring is carried out in the two axial directions by the contact of the removable pin (s) with pins. the locking ring.

The insertion steps consist in placing the locking ring in the connector element concerned, so that a single subsequent rotation can allow the connector to be locked.

In some cases, the insertion steps correspond to a single movement of relative translation of the ring relative to the connector element. This is the case, for example, when the series of studs concerned comprises only one row of studs, or when the series of studs concerned comprises a plurality of rows of studs inscribed in different diameters. This translation makes it possible to position the studs for blocking the bayonet connection.

In other cases, the insertion steps correspond to a combined movement comprising a first translation step, followed by a first rotation and followed by a second translation. These are relative movements between the locking ring and the connector element concerned. This is for example the case, when the series of tenons concerned comprises a plurality of rows of tenons inscribed in identical diameters. The first two relative movements pass a first row of studs. The last translation step allows the pins to be positioned to block the bayonet connection.

1. a) on insère la bague de verrouillage dans le premier élément connecteur, au moyen d'une unique translation ;
2. b) on insère les pions démontables dans le premier élément connecteur ;
3. c) on insère le deuxième élément connecteur dans la bague de verrouillage, par une unique translation et
4. d) on verrouille la bague de verrouillage, par rotation de la bague de verrouillage.

According to one embodiment of the invention, for which several pins are mounted to cooperate with the pins of the first connector element, and for which the first and the third series of pins have two rows of pins inscribed in different diameters, and the second and fourth series of studs have two rows of studs inscribed in different diameters, the process can include the following steps:

1. a) the locking ring is inserted into the first connector element, by means of a single translation;
2. b) the removable pins are inserted into the first connector element;
3. c) the second connector element is inserted into the locking ring, by a single translation and
4. d) the locking ring is locked, by rotation of the locking ring.

1. a) on déverrouille la bague de verrouillage, par rotation de la bague de verrouillage, cette rotation unique déverrouille les deux éléments connecteurs qui peuvent avoir des mouvements relatifs par rapport à la bague de verrouillage ;
2. b) on retire le deuxième élément connecteur de la bague de verrouillage, ainsi, le deuxième élément connecteur est extrait de la bague de verrouillage, alors que le premier élément connecteur est déverrouillé, mais est bloqué en translation dans la bague de verrouillage, notamment par au moins un pion démontable ;
3. c) on retire au moins un pion démontable de la bague de verrouillage, ainsi le premier élément connecteur est positionné dans la bague de verrouillage, en étant déverrouillé et libre de mouvement ; et
4. d) on retire la bague de verrouillage du premier l'élément connecteur, ainsi le premier élément connecteur est extrait de la bague de verrouillage.

In addition, the present invention relates to a method for disassembling two column sections assembled by means of a connector according to the invention. For this process, the following steps can be implemented:

1. a) the locking ring is unlocked, by rotation of the locking ring, this single rotation unlocks the two connector elements which can have relative movements relative to the locking ring;
2. b) the second connector element is removed from the locking ring, thus the second connector element is extracted from the locking ring, while the first connector element is unlocked, but is locked in translation in the locking ring, in particular by at least one removable counter;
3. c) at least one removable pin is removed from the locking ring, thus the first connector element is positioned in the locking ring, being unlocked and free of movement; and
4. d) the locking ring is removed from the first connector element, thus the first connector element is extracted from the locking ring.

For step a), upon unlocking, the rotation of the ring releases the respective cooperation of the first and third series of tenons, and of the second and fourth series of tenons. The rotation allowing the simultaneous unlocking of the two bayonet type connections is a rotation of an angle corresponding to the angular range of the studs. For example, if the studs have an angular range of 36 °, then the unlocking rotation is a rotation of 36 °.

The removal steps consist in extracting the connector element concerned from the locking ring, from a position where the connector element is positioned in the locking ring.

In some cases, the withdrawal steps correspond to a single movement of relative translation of the ring relative to the connector element. This is the case, for example, when the series of studs concerned comprises only one row of studs, or when the series of studs concerned comprises a plurality of rows of studs inscribed in different diameters. This translation frees the studs from the bayonet connection.

In other cases, the withdrawal steps correspond to a combined movement comprising a first translation step, followed by a first rotation and followed by a second translation. These are relative movements between the locking ring and the connector element concerned. This is for example the case, when the series of studs concerned comprises a plurality of studs inscribed in identical diameters. The first stage of translation makes it possible to disengage the studs from the second series of studs. The last two relative movements allow to pass a first row of studs.

1. a) on déverrouille la bague de verrouillage, par rotation de la bague de verrouillage ;
2. b) on retire le deuxième élément connecteur de la bague de verrouillage, par un unique mouvement de translation ;
3. c) on retire les pions démontables dans la bague de verrouillage ; et
4. d) on retire la bague de verrouillage du premier élément connecteur, par un mouvement unique de translation.

According to one embodiment of the invention, for which several pins are mounted to cooperate with the pins of the first connector element, and for which the first and the third series of pins have two rows of pins inscribed in different diameters, and the second and fourth series of studs have two rows of studs inscribed in different diameters, the method comprises the following steps:

1. a) the locking ring is unlocked, by rotation of the locking ring;
2. b) the second connector element is removed from the locking ring, by a single translational movement ;
3. c) removing the removable pins in the locking ring; and
4. d) the locking ring is removed from the first connector element, by a single translational movement.

The figure 5 illustrates, diagrammatically and in a nonlimiting manner, steps of the method for disassembling two sections of riser. The figure 5 corresponds to steps c) and d) of the disassembly process. Initially (left figure), the locking ring 11 is held in translation in the first connector element 8 by means of removable pins 12. Then (central figure), the pins 12 are removed, in order to allow (right figure) remove the locking ring 11 by axial translation of the connector element 8.

The device according to the invention offers an interesting solution for quickly and simply mounting a riser whose tension forces are distributed between the elements of auxiliary tubes and the main tube. Indeed, the connection of a riser section to another riser section is carried out in a single operation by means of the rotation of the locking ring. This connection makes it possible to put in communication and to seal the main tube element of a section with that of the other section and, simultaneously, to put in communication and to seal the elements of auxiliary conduits of one of the sections with those of the other stretch.

For the embodiment, for which the riser comprises at least one auxiliary line, the compact connector according to the invention makes it possible to minimize the bending forces in the flanges, and therefore to reduce the dimensions of the flanges and to reduce the weight connectors. Furthermore, the fact that the ring is positioned between the main tube element and the auxiliary tube elements makes it possible to increase the strength of the connector. Indeed, the ring holds the flanges and prevents them from bending. In addition, this positioning makes it possible to reduce the interference problem of the connections of the auxiliary lines, since the bending moments generated by the offset axial forces are of opposite signs. In addition, in the locked position, the pins of the ring are engaged with the pins of the second connector element which are positioned on the solid part of the second connector element.

Claims (21)

Connector for assembling two sections (4) of riser (1), comprising a first main tube element (6) extended by a first connector element (8), a second main tube element (6) extended by a second connector element (9), a locking ring (11) comprising a first (15) and a second series (16) of studs on its outer surface, said first (8) and second (9) connector elements having respectively on their inner surface a third (17) and fourth (18) sets of pins cooperating with said first (15) and second (16) sets of pins respectively to connect said first and second main tube members (6), said connector further comprising at least a removable pin (12), characterized in that said removable pin (12) cooperates with said locking ring (11) and is arranged in said first connector element (8) to lock said locking ring (11) in translation with respect to said first connector element (8). A connector according to claim 1, wherein said locking ring (11) is centered in said first (8) and second (9) connector elements by means of first (13) and second (14) contact surfaces, respectively. centering provided on said locking ring (11). The connector of claim 2, wherein said connector does not have a sleeve attached to one of said first (8) or second (9) connector elements. Connector according to one of claims 2 or 3, in which said locking ring (11) comprises a first (19) and a second (20) sealing surfaces arranged respectively in said first (8) and second (9) elements connectors. Connector according to one of claims 2 to 4, in which the internal diameter of said locking ring (11) is substantially identical to the internal diameter of said first and second main tube elements (6). The connector of claim 1, wherein said connector comprises a cylindrical sleeve (40) mounted in the first connector element (8). The connector of claim 6, wherein said cylindrical sleeve (40) includes a bearing surface (41) in contact with one end of said locking ring (11). Connector according to one of the preceding claims, in which said locking ring (11) is symmetrical with respect to a median plane of said locking ring perpendicular to the axis of said locking ring (11). Connector according to one of the preceding claims, in which said removable pin (12) cooperates with a lug of said first series of lugs (15) of said locking ring (11) in the unlocked position of said locking ring (11). The connector of claim 9, wherein said removable pin (12) has a flat surface for cooperating with said pin of said first series of pins (15) of said locking ring (11). Connector according to one of the preceding claims, in which said removable pin (12) is arranged in an orifice of said first connector element (8). Connector according to one of the preceding claims, in which said removable pin (12) comprises a polarizing device. Connector according to one of the preceding claims, in which said connector comprises means for blocking the rotation of said locking ring (11). The connector of claim 13, wherein said means for blocking the rotation of said locking ring (11) comprises a system with an indexing finger (28, 31, 33), said indexing finger (28, 31, 33 ) preferably being radial or axial. Connector according to one of the preceding claims, in which said connector comprises means for blocking the rotation of said first (8) and second (9) connector elements. The connector of claim 15, wherein said means for blocking the rotation of said first (8) and second (9) connector elements comprises two stops (23, 24, 25, 26; 35, 36, 38, 39) on each connector element , a stop (23, 24; 35, 39) of a connector element cooperating with a stop (25, 26; 36, 38) of the other connector element. Connector according to Claims 16 and 14, in which said indexing finger (28, 31, 33) of said means for blocking the rotation of the locking ring (11) is integrated in a stop (23, 24, 25, 26; 35, 36, 38, 39) of said means for locking in rotation of said first and second connector elements (8, 9). Connector according to one of the preceding claims, in which the studs of said first (15) and second (16) series of studs project over identical angular ranges. Connector according to one of the preceding claims, in which said first (8) and second (9) connector elements are provided respectively with a flange for the respective passage of a first and a second auxiliary tube element (7). . A riser comprising at least two sections (4) of a riser (1) assembled by a connector (5) according to one of the preceding claims. Use of a riser (1) according to claim 20 for carrying out a drilling or reconditioning of wells or production at sea.

Images