Connector with inner locking ring for assembling two riser sections

Abstract

The invention relates to a compact connector design with an internal locking ring (11). The connector according to the invention comprises a locking ring (11) which allows a bayonet-type connection with two riser sections on either side. Furthermore, the connector comprises at least one removable pin (12) for blocking the locking ring (11) in translation, in particular when locking and unlocking. Thus, the removable pin (12) cooperates with the locking ring (11) by being arranged in the connector elements (8, 9).

Description

Technical Field

[0001] The present invention relates to the field of deep water oil drilling and storage development.The present invention relates to a riser connector.

[0002] The drilling riser consists of an assembly of tubular elements, usually between 15 and 27 m (50 and 90 ft) in length, assembled by means of connectors. The tubular elements usually consist of a main pipe provided with connectors at each end. Parallel to the main pipe are tubular auxiliary lines, also called surrounding lines, usually called "killing lines", "choke lines", "boosting lines" and "hydraulic lines", which enable the circulation of technical fluids. The tubular elements are assembled from floats at the drilling site. When the tubular elements are assembled, the riser is lowered into the water depth until it reaches the wellhead located on the seabed.

[0003] In the context of drilling in water depths of 3500 m or more, the weight of the riser becomes a serious disadvantage, exacerbated by the fact that, for the same maximum operating pressure, the length of the riser requires a larger internal diameter of the auxiliary line, given the need to limit the pressure drop.

[0004] Furthermore, as the water depth is deeper and hence the riser length is greater, the necessity to reduce the riser assembly time is even more critical.

[0005] A riser for other applications, in particular production, completion or workover, also comprises an assembly of tubular elements assembled by connectors. Background Art

[0006] Documents FR-2,925,105, FR-2,956,693 and FR-2,956,694 describe various solutions whose purpose is in particular to involve the auxiliary line as well as the main line when withstanding the longitudinal stresses applied to the riser. However, for the systems described in these patents, the tightening of the auxiliary line relative to the main line induces tensile stresses in the auxiliary line. In order to withstand these tensile stresses, the auxiliary line has large thickness values, which produces an increase in the mass and size of the float and, therefore, an increase in the cost of the riser. Another problem of these connectors relates to the inspection and maintenance of the locking ring. In fact, the locking ring in the above-mentioned patents is not completely removable. It is therefore not possible to inspect the entire locking ring.

[0007] To overcome this problem, patent applications WO-2015 / 071,411, WO-2015 / 169,560 and WO-2015 / 169,559 relate to connectors provided with a locking ring which is removable by means of two bayonet connections. However, these three connectors require a specific column layout to prevent the locking ring from being unlocked simultaneously with two riser sections.

[0008] The solution described in patent application FR-3,045,708 (WO-2017 / 102,220) allows for easy inspection and maintenance of the locking ring, while preventing the locking ring from being disconnected at the same time due to a removable pin. This type of locking ring produces satisfactory results, but it is still desirable to reduce the large number of connector components to reduce component processing costs and improve sealing. In fact, this solution may require a tubular sleeve for assembling the male connector element into the female connector element and for centering the locking ring in the connector element. The sleeve is an additional part that requires additional processing and sealing, as well as additional steps during assembly. In order to overcome these drawbacks, the present invention relates to a compact connector design with an internal locking ring.

[0009] The connector according to the invention comprises a locking ring which allows a bayonet-type connection with two riser sections on either side. Furthermore, the connector comprises at least one removable pin for blocking the locking ring in translation, in particular when locking and unlocking. Thus, the connector according to the invention is removable and simultaneous removal of the ring with the two riser sections is prevented. Furthermore, the locking ring comprises a centering surface in order to achieve centering of the locking ring relative to the connector elements of the sections. Summary of the invention

[0010] The invention relates to a connector for assembling two riser sections, the connector comprising a first main pipe element extending through a first connector element, a second main pipe element extending through a second connector element, a locking ring comprising a first series of columns and a second series of columns on its outer surface, the first connector element and the second connector element respectively comprising a third series of columns and a fourth series of columns on their inner surface respectively cooperating with the first series of columns and the second series of columns for connecting the first and second main pipe elements, the connector further comprising at least one removable pin. The removable pin cooperates with the locking ring and the removable pin is arranged in the first connector element so as to block the locking ring in translation relative to the first connector element.

[0011] According to an embodiment, the locking ring is centered in the first and second connector elements by means of first and second centering surfaces, respectively, provided on the locking ring.

[0012] Preferably, the connector does not comprise a sleeve secured to one of the first or second connector elements.

[0013] Advantageously, the locking ring comprises a first sealing surface and a second sealing surface arranged in the first and second connector elements, respectively.

[0014] Advantageously, the inner diameter of the locking ring is substantially the same as the inner diameter of the first and second main tube elements.

[0015] According to one embodiment, the connector comprises a cylindrical sleeve mounted in the first connector element.

[0016] Preferably, the cylindrical sleeve comprises a bearing surface in contact with one end of the locking ring.

[0017] According to one aspect, the locking ring is symmetrical about a median plane of the locking ring perpendicular to the axis of the locking ring.

[0018] According to one feature, the removable pin cooperates with a post of the first series of posts of the locking ring in the unlocked position of the locking ring.

[0019] Advantageously, said removable pin comprises a planar surface for cooperating with said post of said first series of posts of said locking ring.

[0020] According to one embodiment, the removable pin is arranged in a hole of the first connector element.

[0021] Advantageously, the removable pin comprises a guide lug.

[0022] According to one embodiment, the connector comprises means for blocking the locking ring in rotation.

[0023] Preferably, the means for blocking the locking ring in rotation comprise a system with indexing pins, preferably radial or axial.

[0024] According to an embodiment, the connector comprises means for blocking the first and second connector elements in rotation.

[0025] Preferably, said means for blocking said first and second connector elements in rotation comprise two stops (stops) on each connector element, the stops of one connector element cooperating with the stops of the other connector element.

[0026] Advantageously, said indexing pin of the means for blocking in rotation the locking ring is comprised in a stopper of the means for blocking in rotation the first and second connector elements.

[0027] According to one aspect, the columns of the first and second series of columns protrude over the same angular range.

[0028] According to one feature, said first and second connector elements are respectively provided with flanges for the respective passage of first and second auxiliary pipe elements.

[0029] Furthermore, the invention relates to a riser comprising at least two riser sections assembled by means of a connector according to one of the above features.

[0030] Furthermore, the invention relates to the use of a riser according to the preceding features for performing offshore drilling or well intervention or production operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other characteristics and advantages of the connector according to the invention will become apparent from reading the following description of embodiments given by way of non-limiting example, with reference to the accompanying drawings, in which:

[0032] - Figure 1 A riser according to the invention is schematically shown,

[0033] - Figure 2 A connector according to a first variant embodiment of the present invention is shown.

[0034] - Figure 3 A connector according to an embodiment of the present invention is shown.

[0035] - Figure 4 A locking ring according to an embodiment of the present invention is shown.

[0036] - Figure 5 The steps of unlocking a connector according to an embodiment of the present invention are shown.

[0037] - Figure 6 A device for blocking a connector element in rotation according to the invention is shown,

[0038] - Figure 7 A device for blocking a locking ring in rotation according to a first embodiment is shown,

[0039] - Figure 8 A device for blocking a connector element in rotation according to a second embodiment of the invention is shown,

[0040] - Fig. 9 A device for blocking a locking ring in rotation according to a second embodiment is shown,

[0041] - Fig.10 A device for blocking a locking ring in rotation according to a third embodiment is shown, and

[0042] - Fig.11 A connector according to a second modified embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] According to a non-limiting example embodiment, Figure 1An offshore drilling riser 1 is schematically shown. The riser 1 extends the well P and it extends from a well source 2, for example a platform or a ship, to a float 3. The well source 2 is provided with a protector commonly known as a "BOP" or "Blowout Preventer". The riser 1 consists of an assembly of several sections 4 assembled end to end (end to end) by connectors 5. Each section comprises a main pipe element 6, which is provided with at least one auxiliary line element 7, also known as surrounding line. Several auxiliary lines are usually used, among which are in particular kill lines, choke lines, boost lines and hydraulic lines. The auxiliary lines called "kill lines" or "choke lines" are used to provide safety of the well with respect to the inflow of fluids under pressure in the well during the control process. The lines called "choke lines" are safety lines, which carry the fluids (oil, water, gas) from the well in the case of inflow and drive them towards the choke manifold and flare. The line called "kill line" is a safety line capable of injecting heavy fluids and cement into the well, thus achieving the stop of an otherwise uncontrollable blowout. An auxiliary line called "boost line" allows the injection of mud into the well in order to increase its annular velocity and prevent the deposition of cuttings; it is also used to replace the mud contained in the riser with water before disconnection. The line called "hydraulic line" allows the control of the well source blowout preventer. The hydraulic line allows the BOP safety devices (valves and accumulators) to be supplied with hydraulic fluid under pressure (distilled water loaded with ethylene glycol).

[0044] The section 4 comprises a main pipe element 6, the axis of which forms the axis of the riser. The auxiliary pipe 7 constitutes an auxiliary pipeline or pipe arranged parallel to the axis of the main pipe. The length of the auxiliary pipe element 7 is substantially equal to the length of the main pipe element 6, typically in the range between 10 and 30 meters. At least one pipeline 7 is arranged on the periphery of the main pipe.

[0045] Figure 1 The connector 5 shown comprises two connector elements (not shown). The connector elements are mounted at the ends of the main pipe element 6. The connector elements are fixed to the main pipe element 6, for example by welding, by screwing, by crimping or by clamping. The assembly of the connector elements of one section 4 with the connector elements of another section 4 forms a connector 5 which transfers stresses from one riser section to the next, such stresses being in particular the longitudinal stresses to which the riser is subjected.

[0046] The connector according to the present invention is suitable for use in conjunction with, for example, Figure 1 The connector according to the invention is suitable for drilling risers as described, but it is also suitable for completion, workover or production risers, the specific features of which are in particular without auxiliary pipelines. According to the invention, the connector comprises:

[0047] a first main pipe element, which is extended by a first connector element, which can optionally be provided with guiding means (for example a first flange) for the passage of an auxiliary pipe element (in the case where the riser comprises at least one auxiliary pipeline),

[0048] a second main pipe element, which is extended by a second connector element, which can optionally be provided with guiding means (for example a second flange) for the passage of an auxiliary pipe element (in the case where the riser comprises at least one auxiliary pipeline),

[0049] - optionally, a first auxiliary pipe element passing through the first flange,

[0050] - optionally, a second auxiliary pipe element passing through the second flange,

[0051] a locking ring, called "inner locking ring", arranged inside each connector element, the locking ring comprising on its outer surface a first series of posts and a second series of posts adapted to cooperate with a third series of posts and a fourth series of posts arranged respectively on the inner surface of the first and second connector elements, in order to connect the first and second main conductor elements, and

[0052] - at least one removable pin, which cooperates with the locking ring and is arranged in the first connector element so as to block the locking ring in translation relative to the first connector element, and the removable pin can in particular cooperate with (one of) the columns of the first series of columns of the locking ring or with any other element provided on the locking ring.

[0053] Thus, by means of four series of columns, two bayonet-type connections are formed: a first bayonet connection between the locking ring and the first connector element, and a second bayonet connection between the locking ring and the second connector element. Thus, the locking ring is made removable relative to the connector element, which allows inspection and maintenance thereof. Furthermore, the bayonet-type connection enables rapid locking and unlocking of the connector.

[0054] Arranging the ring inside the two connector elements allows reducing the size of the connector and thus increases connector compactness.

[0055] Furthermore, the arrangement of a removable pin (in the first connector element and cooperating with a post of the locking ring) avoids having a component inside the locking ring to achieve the function of blocking the locking ring in translation relative to the first connector element. In patent application FR-3,045,708 (WO-2017 / 102,220), this function is achieved by a pin that passes through the locking ring and enters a groove or orifice of a male connector element, which may include a sleeve.

[0056] The connector may be designed and sized to meet the specifications mentioned in API 16R and API 2RD standards compiled by the American Petroleum Institute.

[0057] The various embodiments described above and below may be combined to combine their effects.

[0058] According to an embodiment of the present invention, the locking ring may also include a first centering surface and a second centering surface on its outer surface. The first centering surface is used to center the locking ring in the first connector element, and the second centering surface is used to center the locking ring in the second connector element. Therefore, the locking ring realizes both the locking function and the centering function. Therefore, the connector does not include additional elements that realize the centering function in particular, in particular, does not include a sleeve that is fastened to the connector element. In other words, the connector does not require a sleeve, which allows the number of connector components to be limited, which in turn limits the processing of the components and simplifies the connector assembly. In addition, this connector design enables a thicker ring, thereby limiting the mechanical stress and / or outer diameter of the connector, and providing higher rigidity when connected. In addition, this configuration of the locking ring allows the use of the same connector element, which also simplifies the manufacture of the components. Preferably, the centering surface can be composed of a cylindrical surface. Advantageously, the centering surface can be arranged at the longitudinal ends of the locking ring. This maximum distance allows for optimized centering.

[0059] According to one aspect of this embodiment of the invention, the locking ring may include a first and a second sealing surface on its outer surface. The first sealing surface is used to provide a seal between the locking ring and the first connector element, and the second sealing surface is used to provide a seal between the locking ring and the second connector element. Preferably, the sealing surface can be arranged between the centering surface and each series of columns. In other words, for this embodiment, the outer surface of the locking ring may include a first centering surface, a first centering surface, a first series of columns, a second series of columns, a second sealing surface, and a second centering surface in the longitudinal direction. Preferably, each sealing surface is a cylindrical surface. Advantageously, the outer diameter of the sealing surface is greater than the diameter of the centering surface. The seal can be arranged in the groove of the connector element, and then the seal contacts the sealing surface of the locking ring. Alternatively, a seal can be arranged at the sealing surface in the groove of the locking ring, and then the seal contacts the inner surface of the connector element.

[0060] According to the implementation of this embodiment of the invention (ring with centering surface), the inner diameter of the locking ring can be substantially the same as the inner diameter of the first and second connector elements, which are substantially the same as the diameters of the first and second main pipe elements. This implementation allows avoiding pressure drops in the main pipe due to the substantially constant inner diameter of the main pipe.

[0061] Alternatively, the connector may include a cylindrical sleeve. The cylindrical sleeve may be mounted on one connector element (e.g., the first connector element), and it may be inserted into another connector element (e.g., the second connector element). Then, the locking ring is arranged around the sleeve. The cylindrical sleeve may be assembled to the first connector element by bolting, threading, shrink fitting, using a retaining spring (circlip) or any similar device. Alternatively, the cylindrical sleeve may rest on the upper bearing surface of the locking ring. In other words, the cylindrical sleeve may rest on the axial end of the locking ring inserted in the first connector element. According to an exemplary embodiment, a shoulder may be provided on the outer surface of the sleeve, thereby forming a bearing surface. The cylindrical sleeve also allows, in particular, to achieve centering and sealing functions.

[0062] According to an embodiment of the invention, the posts of the first and second series of posts (and also the third and fourth series of posts) protrude over the same angular range. The angular range of a post is to be understood as the angle formed by the portion of the disk occupied by the post on the diameter inscribed therein. For example, if a series of posts comprises a post representing every sixth of the disk, the angular range of the post is 60°. Thus, by means of this design, the locking and unlocking of the locking ring relative to the two connector elements can be produced by a single rotation and become simultaneous. Thus, the locking ring rotates only between two angular positions.

[0063] According to a first embodiment of the invention, the circumferential distribution of the columns of the first and second series is symmetrical with respect to a radial plane passing between the columns of the two series. In other words, the columns of the first series and the columns of the second series face each other (are aligned). Therefore, the locking ring can be symmetrical with respect to a middle plane of the locking ring, which plane is perpendicular to the axis of the locking ring. This symmetrical design allows in particular to simplify the assembly and manufacture of the locking ring. According to a second embodiment of the invention, the circumferential distribution of the columns of the first series and the columns of the second series are relative to each other: the circumferential distribution of the columns of the second series is offset relative to the columns of the first series by an angle corresponding to the angular range of the columns. In other words, the columns of one series face the intervals of another series. According to a third embodiment of the invention, the circumferential distribution of the columns of the first series and the columns of the second series is offset relative to each other by an angle corresponding to half of the angular range of the columns (or any other angle).

[0064] Alternatively, the first series of columns and the columns in the second series of columns (and also the columns in the third series of columns and the columns in the fourth series of columns) protrude over different angular ranges. Thus, unlocking of the two bayonet connections is achieved by different rotations.

[0065] Preferably, the locking ring may be made in one piece.

[0066] The purpose of the removable pin(s) is to support the weight of the locking ring in the unlocked position. Preferably, they are set (fixed) during assembly, and they are removed only for inspection.

[0067] Advantageously, when the removable pin is intended to come into contact with the post of the locking ring, the removable pin may comprise a plane surface for cooperating with the post of the locking ring. The contact is thus facilitated, which enables a simple translational blocking to be achieved.

[0068] Advantageously, the removable pin may be arranged in a hole in the connector element. The hole is preferably radial. The hole may be provided between the flange and the end of the first connector element facing the second connector element.

[0069] In addition, in order to facilitate the insertion and positioning of the removable pin, the removable pin may include a guide lug. In other words, the removable pin has a specific shape that allows the removable pin to be correctly positioned.

[0070] According to an embodiment of the invention, the locking device comprises a plurality of removable pins. Thus, the stress can be distributed between the removable pins. For this embodiment, a plurality of removable pins corresponding to the number of the third series of columns or the fourth series of columns (and also of the first series of columns or the third series of columns) can be provided. Alternatively, a number of removable pins substantially corresponding to half the number of the third series of columns or the fourth series of columns can be provided. This alternative allows a compromise to be obtained between the number of pins and the stress exerted on the pins.

[0071] According to an embodiment of the present invention, each series of columns may include at least one row of columns. A row of columns is understood to be a circumferential distribution of columns. Each row of columns has alternating protruding columns and gap spaces (intervals) that allow corresponding columns of each series of columns that cooperate with this row of columns to pass through.

[0072] According to an embodiment of the invention, each series of columns may comprise multiple rows of columns, in particular two or three rows of columns. Multiple rows of columns allow the axial loads on the columns to be reduced, which allows limiting mechanical fatigue of the columns.

[0073] According to one possible design, each series of columns comprises a single row of columns. According to a first alternative, each series of columns comprises two rows of columns. According to a second alternative, each series of columns comprises three rows of columns. According to a third alternative, two of the four series of columns comprise one row of columns, while the other two comprise two rows of columns. According to a fourth alternative, two of the four series of columns comprise two rows of columns, while the other two comprise three rows of columns.

[0074] In the case where a series of columns comprises several rows of columns, the columns of each row can be inscribed with different diameters. This design allows a row of columns of smaller diameter to pass through, and thus the bayonet connection can be locked and unlocked with a single rotation.

[0075] In the case where the series of columns comprises several rows of columns, the columns can be inscribed with the same diameter. The design requires the insertion and locking of the bayonet connection by a relative movement consisting of a first translation, a first rotation, a second translation and a second rotation. The design achieves better connection security since this avoids unnecessary disconnection.

[0076] Each row of columns comprises a plurality of columns evenly distributed over the diameter. Advantageously, the columns of each row may be arranged to allow 360° locking. According to one design, the columns of each row may comprise three columns, whose angular range is 60° or 40°. According to an alternative, the columns in a row may comprise four columns, whose angular range is 45° or 30°. According to an alternative, the columns in a row may comprise five columns, whose angular range is 36° or 24°. According to another alternative, the columns in a row may comprise six columns, whose angular range is 30° or 20°. According to an alternative, the columns in a row may comprise eight columns, whose angular range is 22.5° or 15°. In order for the columns to protrude within the same angular range, all rows of all series of columns may comprise the same number of columns.

[0077] In addition, according to the connector design, the ring may include a device, such as a stopper, for blocking the connector element in terms of rotation. For this embodiment, the device for blocking the lock ring in terms of rotation may include two stops on each connector element, and the stopper of the first connector element cooperates with the stopper of the second connector element. The stopper may also be referred to as a claw or a support. On a connector element, the stopper may be substantially in the shape of an L, preferably an elongated L, and on another connector element, the stopper may be substantially in the shape of a T, preferably, the entire vertical vertical (vertical bar) of the T is equal to half of the horizontal horizontal (horizontal bar) of the T. Each matching stopper pair realizes a rotation direction that prevents the connector element. For example, the vertical vertical of the T of the stopper of the first connector element contacts a smaller part of the L of the stopper of the second connector element. Alternatively, the stopper may have other shapes, such as right angles, concave and convex surfaces, etc.

[0078] Advantageously, the stop can be removable. This solution enables quick and cheap replacement in case of maintenance and the use of the same connector element. In this case, the stop can be fixed to the connector element with screws. Alternatively, the stop is machined in the flange of the connector element. This alternative also allows the use of the same connector element.

[0079] According to a feature of the invention, the connector may comprise means for blocking the locking ring in at least one position, in particular in the locked position. These blocking means may also allow the locking ring to be prevented from rotating relative to the first connector element in the unlocked position. The means for blocking the locking ring allow any undesired unlocking of the locking ring to be avoided.

[0080] According to one example of this embodiment, the means for blocking the locking ring in rotation may include a system with an indexing pin (ie, the pin fits in the hole when it is in the blocking position). The indexing pin may be axial or radial. Such a system has the advantage of automation.

[0081] According to one embodiment of the invention, the system can combine the two variants described above. The indexing pin of the means for locking the ring in rotation can be inserted in a stopper of the means for blocking the connector element in rotation. This combination allows the two blocking means to be engaged within each other, which limits the number of components and facilitates maintenance and inspection operations.

[0082] According to one design of the invention, the locking ring may include operating means on the outside of the locking ring. These operating means allow the locking ring to rotate. For example, the operating means may be a lever. According to one design, the operating means may be inserted in a removable pin.

[0083] According to one embodiment, the locking ring may be a one-piece ring, which simplifies the design and assembly of the connector.

[0084] As a non-limiting example, Figure 2 A first variant embodiment connector according to the invention is schematically shown, which assembles two riser sections. Figure 2Corresponding to a sectional view of a connector. In this figure, only one side of the sectional view is shown, and the second side can be derived by axial symmetry. The axis of the section and the axis of the connector are shown horizontally. In this figure, flanges for auxiliary pipe elements are shown, but they are not necessary for the connector according to the invention. The first connector element 8 is connected to the second connector element 9. The locking device implements and locks the assembly. The locking device comprises a locking ring 11. The locking ring 11 comprises a first series of columns 15 and a second series of columns 16 on its outer surface. The first series of columns 15 cooperate with a third series of columns 17 arranged on the inner surface of the first connector element 8. The second series of columns 16 cooperate with a fourth series of columns 18 arranged on the inner surface of the second connector element 9. In addition, the locking device comprises 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 protrude on the inner part of the first connector element 8. The locking ring 11 also comprises two centering surfaces 13 and 14 at the longitudinal ends of the locking ring 11. The first centering surface 13 allows centering of the locking ring 11 relative to the first connector element 8. The second centering surface 14 allows centering of the locking ring 11 relative to the second connector element 9. Furthermore, the locking ring 11 comprises two sealing surfaces 19 and 20, which are situated between the centering surfaces 13 and 14 and the series of posts 15 and 16.

[0085] As a non-limiting example, Figure 3 The cross-sectional view schematically shows the Figure 2 The connector element 8 or 9 of the embodiment. The connector element 8 or 9 is a substantially cylindrical portion comprising a first end 22 for fastening to a main pipe element (not shown). The connector element 8 or 9 comprises on its inner surface a third series of columns consisting of two rows of columns 17A and 17B. Row 17A is the most central row of the connector. According to the embodiment shown, each row of columns 17A, 17B comprises four columns with an angular range of 45°. The two rows of columns 17A, 17B are inscribed with different diameters. Thus, insertion and locking in the locking ring can be achieved by a single translation (and, conversely, unlocking and removal can be achieved). In addition, the circumferential distribution of the columns of rows 17A, 17B is alternating: the columns of row 17A face the interval between the two columns of row 17B (the columns of row 17A are aligned with the interval between the two columns of row 17B); and vice versa. By way of non-limiting example, the figure schematically shows the shape of the flange that allows the passage of an auxiliary pipe element. Furthermore, the connector element 8 or 9 comprises an inner bore for receiving the centering surface and the sealing surface, respectively, of the locking ring.

[0086] As a non-limiting example, Figure 4A locking ring 11 according to one embodiment of the present invention is schematically shown. The locking ring 11 is a generally cylindrical portion. The locking ring 11 comprises a first series of columns 15 and a second series of columns 16 on its outer surface. The first series of columns 15 is adapted to cooperate with a third series of columns of a first connector element. The second series of columns 16 is adapted to cooperate with a fourth series of columns of a second connector element. According to the embodiment shown, each series of columns 15, 16 comprises two rows of columns 15A, 15B and 16A, 16B. Rows 15A and 16A are the most central rows of columns. Each row of columns comprises four columns, the angle of which ranges by 45°. In the example shown, the columns 15A, 16A of the middle row are inscribed with a smaller diameter than the columns 15B, 16B of the outer rows. In addition, the circumferential distribution of the columns of rows 15A, 15B is alternating: the columns of row 15A face (align) the interval between two columns of row 15B; and vice versa. Similarly, the circumferential distribution of the rows 16A, 16B is alternating: the columns of the row 16A face (are aligned with) the spaces between two columns of the row 16B; and vice versa. Moreover, for the embodiment shown, the circumferential distribution of the columns of the first and third series is symmetrical about the radial plane between the columns of the first and third series: the columns of the row 15A face (are aligned / aligned with) the columns of the row 16A; and the columns of the row 16B face (are aligned / aligned with) the columns of the row 16B. The locking ring 11 also comprises at these ends two cylindrical centering surfaces 13, 14 and possibly two cylindrical sealing surfaces (not shown), which are respectively arranged between one of the centering surfaces 13 or 14 and a series of columns 15 or 16.

[0087] Figure 6 By way of non-limiting example, two assembled connector elements are schematically shown, which are equipped with means for blocking the connector elements in rotation according to a first embodiment of a blocking device. Figure 6The right side of is an enlarged view of a device for blocking connector elements in rotation. The first connector element 8 includes two stops 23 and 24 on its outer surface and at its ends. Stops 23 and 24 are roughly T-shaped, and the vertical dimension of T is similar to half the length of the horizontal cross of T. Stops 23 and 24 can be removable: they are fastened to the first connector element 8 by screws. The second connector element 9 includes two stops 25 and 26 on its outer surface and at its ends. Stops 25 and 26 have roughly the shape of an elongated L. Stops 25 and 26 can be arranged in relative positions. Stops 25 and 26 are removable: they are fastened to the second connector element 9 by screws. Stops 23 and 25 cooperate to prevent rotation in the rotation direction (clockwise). Stop 24 cooperates with stop 26 to prevent rotation in the opposite rotation direction (counterclockwise). The contact surfaces of the stops 23, 24, 25 and 26 (in the case shown, the vertical verticals of T and the smaller / short sides of L) protrude from the connector elements 8 and 9 in their axial direction, at the interval between the connector elements 8 and 9, which makes a part of the outer surface of the locking ring 11 accessible.

[0088] Figure 7 By way of non-limiting example, two connector elements are schematically shown assembled and equipped with means for blocking the locking ring in rotation according to a first variant embodiment. Figure 7 On the right side of the figure is an enlarged view of the device for blocking the locking ring in rotation. The first connector element 8 comprises two bearings 27 and 30 for indexing pins 28 and 31 on its outer surface and at its ends. For the embodiment shown, the indexing pins 28 and 31 have a radial direction. The indexing pins 28 and 31 are intended to engage into holes, such as the hole 29, provided on the bearing of the locking ring 11. The bearings 27 and 30 are removable: they are fastened to the first connector element 8 by screws. The bearings 27 and 30 protrude from the connector element 8 in its axial direction, at the interval between the two connector elements 8 and 9, which makes a part of the outer surface of the locking ring 11 accessible.

[0089] Figure 7 Means for blocking the locking ring in rotation are shown, which are independent of the means for blocking the connector element in rotation. However, the means for blocking the locking ring can be included in the means for blocking the connector element. In this case, the bearings 27 and 30 can correspond to the stops 23 and 24, in which holes for the passage of the positioning pins 28 and 31 can be provided. In the present case, the holes can be provided in the vertical bars (vertical bars) of the T of the stops 23 and 24.

[0090] Figure 8By way of non-limiting example, two assembled connector elements are schematically shown, which are equipped with a device for blocking a connector element in rotation according to a second embodiment of the device for blocking a connector element in rotation. Figure 8 On the right side of FIG. 8 is an enlarged view of the means for blocking the connector elements in rotation. The first connector element 8 comprises two stops 36 and 38 on its outer surface and at its ends.

[0091] The stoppers 36 and 38 protrude in the axial direction of the first connector element 8. The second connector element 9 includes two stoppers 35 and 39 on its outer surface and at its ends. The stoppers 35 and 39 protrude in the axial direction of the second connector element 9. The stopper 35 cooperates with the stopper 36 to block the rotation in one rotation direction (clockwise). The stopper 38 cooperates with the stopper 39 to prevent the rotation in the opposite rotation direction (counterclockwise). The contact surfaces of the stoppers 35, 36, 38 and 39 protrude from the connector elements 8 and 9 in the axial direction thereof at the interval between the two connector elements 8 and 9, which makes a part of the outer surface of the locking ring 11 accessible. According to an exemplary embodiment and as shown in the figure, the removable pin 12 can be arranged above the stopper 36 or 38 in the form of a protrusion.

[0092] Fig. 9 By way of non-limiting example, two connector elements are schematically shown assembled, equipped with means for blocking a locking ring in rotation, which means are included in a device for blocking connector elements in rotation according to a second variant embodiment. Fig. 9 The right side of the figure is an enlarged view of the means for blocking the locking ring in rotation. The means for blocking the connector element in rotation corresponds to the combination Figure 8 Those devices described. The first connector element 8 comprises two stops 36 and 38 on its outer surface and at its ends. The stops 36 and 38 protrude in the axial direction of the first connector element 8. The second connector element 9 comprises two stops 35 and 39 on its outer surface and at its ends. 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 bearings for the indexing pins 28 and 31: the stops 36 and 38 comprise holes for the passage of the indexing pins 28 and 31. For the embodiment shown, the indexing pins 28 and 31 have a radial direction. The indexing pins 28 and 31 are intended to engage into holes, such as the hole 29, provided on the stop 25 of the locking ring 11. According to an exemplary embodiment and as shown in the figure, the removable pin 12 can be arranged above the stop 36 or 38.

[0093] According to Fig.10Alternatively, each connector may include means for blocking the locking ring in rotation, which means are not associated with the means for blocking the connector element in rotation, or the connector may include only means for blocking the locking ring in rotation. In both cases, the first connector element comprises two axial projections at its ends, in which two indexing pins 33 are inserted.

[0094] As a non-limiting example, Fig.10 The device for blocking the locking ring in rotation according to a second variant embodiment is schematically shown. The second connector element 9 comprises, on its outer surface and at its end, a bearing 32 for an indexing pin 33. The indexing pin 33 has an axial direction. The indexing pin 33 is intended to engage in a hole of a bearing 34 fastened to the locking ring 11. The bearings 32 and 34 are removably fastened by a threaded connection.

[0095] Fig.10 Means for blocking the locking ring in rotation are shown, which are independent of the means for blocking the connector element in rotation. However, the means for blocking the locking ring may be included in the means for blocking the connector element. In this case, the support 32 may correspond to the stop 25, in which a hole for the passage of the indexing pin 33 may be provided.

[0096] As a non-limiting example, Fig.11 A connector according to a second variant embodiment of the present invention is schematically shown. Fig.11 1 corresponds to a cross-sectional view of a connector. In this figure, flanges for auxiliary pipe elements are shown, but they are not necessary for the connector according to the invention. The first connector element 8 is connected to the second connector element 9. A locking device is implemented and locks the assembly. The locking device comprises a locking ring 11. The bayonet connection (with a series of columns) between the locking ring 11 and the connector elements 8 and 9 is connected to Figure 2 1 and 1 . The locking ring 11 is a first connector element 8 and a second connector element 9 ...

[0097] Furthermore, the invention relates to a riser comprising at least two riser sections assembled by a connector as described above. The connector may be manufactured according to any combination of the above embodiments: multiple removable pins, multiple rows of studs, rows of columns inscribed with the same or different diameters, means for blocking the locking ring in rotation, means for blocking the connector element in rotation, locking ring provided with a sealing surface, locking ring symmetry, etc.

[0098] Furthermore, the present invention relates to the use of such a riser (having any combination of the above-described embodiments) in performing offshore drilling, wastewater production or well repair operations.

[0099] Furthermore, the invention relates to a method for assembling two riser sections by means of a connector according to the invention. The following steps may be performed for this method:

[0100] a) inserting the locking ring into the first connector element, so that the first main connector element is positioned in the locking ring but not locked,

[0101] b) inserting at least one removable pin into the first connector element until it comes into contact with the post of the locking ring, thereby positioning the first main connector element in the locking ring while being blocked in translation, while still having rotational movement, so that it is not locked,

[0102] c) inserting the locking ring into the second connector element so that the second main connector element is positioned in the locking ring but not locked,

[0103] d) Locking the locking ring by rotating it, this single rotation locks the two connector elements against any relative movement with respect to the locking ring.

[0104] For step d), when locking, the rotation of the ring produces a corresponding cooperation of the first series of posts with the third series of posts and of the second series of posts with the fourth series of posts. The rotation that can achieve the locking of two bayonet-type connections at the same time is a rotation whose angle corresponds to the angular range of the posts. For example, if the angular range of the posts is 36°, the locking rotation is a 36° rotation.

[0105] For step b), blocking of the first main tube element in axial translation relative to the locking ring is achieved in both axial directions by bringing the removable pin(s) into contact with the studs of the locking ring.

[0106] The insertion step consists in setting the locking ring in the connector element in question, so that a subsequent single rotation allows locking the connector.

[0107] In some cases, the insertion step corresponds to a single relative translation movement of the ring relative to the connector element. This is the case, for example, when the series of columns involved comprises only one row of columns, or when the series of columns involved comprises several rows of columns inscribed with different diameters. This translation allows the columns to be positioned to block the bayonet connection.

[0108] In other cases, the insertion step corresponds to a combined movement comprising a first translation phase, followed by a first rotation and then a second translation. These are relative movements between the locking ring and the connector element in question. This is the case, for example, when the series of columns in question comprises several rows of columns inscribed with the same diameter. The first two relative movements allow the passage of the columns of the first row. The last translation step allows the column to be positioned to block the bayonet connection.

[0109] According to an embodiment of the invention, wherein the plurality of pins are mounted to cooperate with the posts of the first connector element, and wherein the posts of the first series and the posts of the third series comprise two rows of posts inscribed with different diameters, and the posts of the second series and the posts of the fourth series comprise two rows of posts inscribed with different diameters, the method may comprise the following steps:

[0110] a) inserting the locking ring into the first connector element by means of a single translation,

[0111] b) inserting the removable pin into the first connector element,

[0112] c) inserting the second connector element into the locking ring in a single translation, and

[0113] d) Lock the lock ring by rotating it.

[0114] Furthermore, the invention relates to a method for disassembling two riser sections assembled by means of a connector according to the invention. The method may comprise the following steps:

[0115] a) unlocking the locking ring by rotating it, this single rotation unlocks the two connector elements, which can have relative movement with respect to the locking ring,

[0116] b) removing the second connector element from the locking ring, thereby taking the second connector element out of the locking ring when the first connector element is unlocked but blocked in translation in the locking ring, in particular by means of at least one removable pin,

[0117] c) removing at least one removable pin from the locking ring, thereby positioning the first connector element in the locking ring while being unlocked and free to move, and

[0118] d) Removing the locking ring from the first connector element, thereby taking the first connector element out of the locking ring.

[0119] For step a), when unlocking, the rotation of the ring releases the corresponding cooperation of the first series of posts and the third series of posts and the second series of posts and the fourth series of posts. The rotation that can simultaneously unlock two bayonet-type connections is a rotation whose angle corresponds to the angular range of the posts. For example, if the angular range of the posts is 36°, the unlocking rotation is a 36° rotation.

[0120] The removal step includes taking the connector element in question out of the locking ring from its position in the locking ring.

[0121] In some cases, the removal step corresponds to a single (single) relative translational movement of the ring relative to the connector element. This is the case, for example, when the series of columns involved comprises only one row of columns, or when the series of columns involved comprises several rows of columns inscribed with different diameters. This translation allows the release of the columns from the bayonet connection.

[0122] In other cases, the removal step corresponds to a combined movement comprising a first phase of translation, followed by a first rotation and then a second translation. These are relative movements between the locking ring and the connector element in question. This is the case, for example, when the series of columns in question comprises a plurality of columns inscribed with the same diameter. The first translation step allows the disengagement of the columns of the second series. The last two relative movements allow the passage of the columns of the first row.

[0123] According to an embodiment of the invention, wherein several pins are mounted to cooperate with posts of a first connector element, and wherein the posts of the first series and the posts of the third series comprise two rows of posts inscribed with different diameters, and the posts of the second series and the posts of the fourth series comprise two rows of posts inscribed with different diameters, the method comprises the following steps:

[0124] a) Unlock the lock ring by rotating it,

[0125] b) removing the second connector element from the locking ring with a single translational movement,

[0126] c) removing the removable pin in the locking ring, and

[0127] d) Removing the locking ring from the first connector element by a single translational movement.

[0128] As a non-limiting example, Figure 5 The steps of a method for disassembling two riser sections are schematically shown. Figure 5 Corresponding to steps c) and d) of the disassembly method, initially (left figure), the locking ring 11 is held in translation in the first connector element 8 by means of a removable pin 12. The pin 12 is then removed (middle figure) to allow (right figure) the locking ring 11 to be removed by axial translation of the connector element 8.

[0129] The device according to the invention provides an attractive solution for fast and simple installation of a riser, the tension of which is distributed between the auxiliary pipe elements and the main pipe. In practice, the connection of one riser section to another is achieved in a single operation by rotation of the locking ring. This connection allows the main pipe of one section to communicate and seal with the main pipe of another section and, at the same time, the auxiliary line elements of one section to communicate and seal with the auxiliary line elements of another section.

[0130] For embodiments in which the riser comprises at least one auxiliary line, the compact connector according to the invention allows minimizing the bending stresses in the flange and thus reducing the size of the flange and reducing the weight of the connector. Furthermore, positioning the ring between the main pipe element and the auxiliary pipe element allows increasing the strength of the connector. In fact, the ring holds the flange and prevents it from bending. Furthermore, since the bending moments caused by the offset axial forces have different signs (positive and negative signs), this positioning allows solving the problem of interference with the auxiliary line fittings. Furthermore, in the locked position, the columns of the ring engage with the columns of the second connector element, which are located on the main part (most part) of the second connector element.

Claims

1. A connector for assembling two sections (4) of a riser (1), comprising a first main pipe element extending through a first connector element (8), a second main pipe element extending through a second connector element (9), a locking ring (11), the outer surface of the locking ring comprising a first series of columns (15) and a second series of columns (16), the inner surfaces of the first connector element (8) and the second connector element (9) comprising a third series of columns (17) and a fourth series of columns (18) respectively cooperating with the first series of columns (15) and the second series of columns (16) to connect the first main pipe element and the second main pipe element, the connector further comprising at least one removable pin (12), characterized in that The removable pin (12) cooperates with the first series of posts of the locking ring (11), and the removable pin (12) is arranged in the first connector element (8) so as to block the locking ring (11) in translation relative to the first connector element (8).

2. The connector according to claim 1, wherein: The locking ring (11) is centered in the first connector element (8) and the second connector element (9) by means of a first centering surface (13) and a second centering surface (14) respectively provided on the locking ring (11).

3. The connector according to claim 2, characterized in that The connector does not include a sleeve fastened to one of the first connector element (8) or the second connector element (9).

4. The connector according to claim 2 or 3, characterized in that: The locking ring (11) comprises a first sealing surface (19) and a second sealing surface (20) which are arranged in the first connector element (8) and the second connector element (9), respectively.

5. The connector according to claim 2 or 3, characterized in that: The inner diameter of the locking ring (11) is substantially the same as the inner diameters of the first main pipe element and the second main pipe element (6).

6. The connector according to claim 1, wherein: The connector comprises a cylindrical sleeve (40) mounted in a first connector element (8).

7. The connector according to claim 6, characterized in that The cylindrical sleeve (40) includes a bearing surface (41) that contacts one end of the locking ring (11).

8. The connector according to any one of claims 1 to 3, characterized in that: The locking ring (11) is symmetrical about a middle plane of the locking ring, and the middle plane is perpendicular to an axis of the locking ring (11).

9. The connector according to any one of claims 1 to 3, characterized in that: In the unlocked position of the locking ring (11), the removable pin (12) cooperates with a post of the first series of posts (15) of the locking ring (11).

10. The connector according to claim 9, characterized in that The removable pin (12) includes a planar surface for cooperating with the post of the first series of posts (15) of the locking ring (11).

11. The connector according to any one of claims 1 to 3, characterized in that: The removable pin (12) is arranged in a hole of the first connector element (8).

12. The connector according to any one of claims 1 to 3, characterized in that: The removable pin (12) includes a guide lug.

13. The connector according to any one of claims 1 to 3, characterized in that: The connector comprises means for blocking the locking ring (11) in rotation.

14. The connector according to claim 13, wherein: The device for blocking the locking ring (11) in rotation comprises a system with indexing pins (28, 31, 33).

15. The connector according to claim 14, wherein: The indexing pins (28, 31, 33) are radial or axial.

16. The connector according to any one of claims 1 to 3, characterized in that: The connector comprises means for blocking the first connector element (8) and the second connector element (9) in rotation.

17. The connector according to claim 16, wherein: The device for blocking the first connector element (8) and the second connector element (9) in terms of rotation includes two stops (23, 24, 25, 26; 35, 36, 38, 39) on each connector element, and the stop (23, 24; 35, 39) of one connector element cooperates with the stop (25, 26; 36, 38) of the other connector element.

18. The connector according to claim 14 or 15, characterized in that: The connector comprises a device for blocking the first connector element (8) and the second connector element (9) in terms of rotation, the device for blocking the first connector element (8) and the second connector element (9) in terms of rotation comprises two stops (23, 24, 25, 26; 35, 36, 38, 39) on each connector element, the stop (23, 24; 35, 39) of one connector element cooperates with the stop (25, 26; 36, 38) of the other connector element, and wherein the indexing pin (28, 31, 33) of the device for blocking the locking ring (11) in terms of rotation is included in the stop (23, 24, 25, 26; 35, 36, 38, 39) of the device for blocking the first connector element (8) and the second connector element (9) in terms of rotation.

19. The connector according to any one of claims 1 to 3, characterized in that: The first series of pillars (15) and the second series of pillars (16) project over the same angular range.

20. The connector according to any one of claims 1 to 3, characterized in that: The first connector element (8) and the second connector element (9) are respectively provided with flanges for allowing the first auxiliary pipe element and the second auxiliary pipe element to pass through respectively.

21. A riser comprising at least two sections (4) of riser (1) assembled by means of a connector (5) according to any one of claims 1 to 20.

22. Use of a riser (1) according to claim 21 in performing offshore drilling, well intervention or production operations.

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