Anti-typhoon hard suspension device for drilling riser

Abstract

The anti-typhoon hard suspension device for the drilling riser comprises a platform main body, a suspension short section, the riser and a compressible centering mechanism, the top of the platform main body is provided with an opening penetrating up and down, and a drill floor is fixedly installed at the opening; a mounting hole penetrating up and down is formed in the center of the drill floor; the hanging short section is vertically mounted in the mounting hole, and the marine riser is vertically and fixedly mounted at the lower end of the hanging short section; the centering mechanism is fixedly installed on the drill floor, located below the installation hole and fixedly arranged outside the hanging short section in a sleeving mode. The bending resistance of the marine riser is improved, meanwhile, the slightly-compressible centering mechanism is in interference fit with the hanging short section and the wedge block, micro-bending and micro-torsion of the lower end of the hanging short section can be achieved, the purpose of releasing part of bending moment and torque loads of the marine riser is achieved, the bending moment and torque are prevented from being transmitted to the upper end of the hanging short section and the compensation hydraulic cylinder, and the service life of the marine riser is prolonged. The safety of the system is ensured; and meanwhile, subsequent safety analysis on the sailing speed of the suspended marine riser is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oil drilling and production, and in particular to an anti-platform hard suspension device for a drilling riser. Background Art

[0002] When a drilling platform encounters a strong typhoon during operation and the typhoon wind force exceeds the platform's self-sustaining capacity, the platform needs to evacuate to a place far away from the typhoon center or the storm area outside the center. Before the platform evacuates, the riser and the lower parts are unlocked in advance and the riser is completely recovered to the platform. However, sometimes it is too late to completely recover the riser. At this time, the choice of suspending the riser for evacuation and suspending the sailing speed is a necessary measure taken by the platform.

[0003] However, when the platform is sailing with the riser suspended, the strong current load will have a great impact on the suspended riser, resulting in the risk of riser buckling due to insufficient tension; the risk of riser collision with the moon pool; the risk of column and lower buoy collision; the maximum rotation angle limit of the riser hose hanging, etc. The unreasonable coordination of the riser suspension length and the suspension navigation speed will cause major accidents and endanger personal safety.

[0004] At present, according to the different boundary conditions of the upper part of the suspended riser column, the floating drilling platform riser suspension mode can be divided into hard suspension and soft suspension. The upper end of the riser system of the soft suspension method is similar to the working state, the upper end is connected to the flexible joint, the telescopic short circuit is locked, there is a risk of collision, and the original length of the riser can only be maintained during suspension; the hard suspension method takes out the upper flexible joint and telescopic short circuit before sailing, recovers part of the single riser, and finally fixes the riser to the universal joint on the drilling platform. The top end constrains all degrees of freedom, and there is a risk of strength damage at the top end. Summary of the invention

[0005] The invention provides an anti-platform hard suspension device for a drilling riser, aiming to solve the problems in the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A platform-proof hard suspension device for a drilling riser, comprising a platform body, a suspension pup joint, a riser and a compressible centering mechanism, wherein the top of the platform body is provided with an opening extending upward and downward, and a drilling platform is fixedly installed at the opening; a mounting hole extending upward and downward is provided at the center of the drilling platform; the suspension pup joint is vertically installed in the mounting hole, and its two ends extend to the outside of the mounting hole respectively, and the riser is vertically fixedly installed at the lower end of the suspension pup joint; the centering mechanism is fixedly installed on the drilling platform, is located below the mounting hole, and is fixedly sleeved outside the suspension pup joint.

[0008] The beneficial effect of the present invention is that during use, the conventional technology requires that the riser be removed in advance when the platform body moves, while the present invention utilizes a compressible centering mechanism to buffer the riser during the movement of the platform body, eliminating the need to remove the riser in advance, saving time in lowering and recovering the riser, and greatly improving operating efficiency.

[0009] The present invention improves the bending resistance of the riser. At the same time, the interference fit between the slightly compressible centering mechanism and the suspension pup section and the wedge block can achieve micro-bending and micro-torsion of the lower end of the suspension pup section, thereby achieving the purpose of releasing the bending moment and torque load of the riser part, avoiding the bending moment and torque from being transmitted to the upper end of the suspension pup section and the compensating hydraulic cylinder, and ensuring the safety of the system.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, a protrusion is provided at the lower part of the suspension short section, and the centering mechanism is sleeved outside the protrusion.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the shape of the above-mentioned protrusion is reasonably designed, which is used to change the force direction between the protrusion on the suspension short section and the slightly compressible centering mechanism, increase the force range and contact area, realize the release of the bending moment load, limit the maximum turning angle generated by the lower end of the suspension short section and the watertight pipe, and avoid the risk of the watertight pipe colliding with the moon pool and the risk of collision between the column and the lower floating body.

[0013] Furthermore, the protrusion is ellipsoidal in shape, and an arc-shaped transition section is provided at the upper part and the lower part thereof respectively.

[0014] The beneficial effect of adopting the above-mentioned further scheme is that the shape of the above-mentioned protrusion is reasonably designed, which is used to change the force direction between the protrusion on the suspension short section and the slightly compressible centering mechanism, increase the force range and contact area, realize the release of the bending moment load, limit the maximum turning angle generated by the lower end of the suspension short section and the watertight pipe, and avoid the risk of the watertight pipe colliding with the moon pool and the risk of collision between the column and the lower floating body.

[0015] Furthermore, a plurality of pairs of wedge blocks are relatively arranged in the middle of the protrusion, and the plurality of pairs of wedge blocks are located in the centering mechanism.

[0016] The beneficial effect of adopting the above further solution is that the setting of the wedge block ensures that the protrusion on the suspension short section and the slightly compressible centering mechanism do not move up and down or slip, and ensures that the upper part of the suspension short section is in a vertical state, while achieving the release of the torque load.

[0017] Furthermore, the number of the wedge blocks is two pairs, and the two pairs of wedge blocks are distributed in a cross shape.

[0018] The beneficial effect of adopting the above further solution is that the number of wedges is reasonably designed, which further improves the effect.

[0019] Furthermore, a nozzle housing is fixedly connected to the outside of the centering mechanism, and the nozzle housing is fixedly connected to the drilling platform.

[0020] The beneficial effects of adopting the above further solution are simple structure, reasonable design, interference fit between the housing of the rotary sprayer and the raised section of the suspension short section, ensuring effective transmission of torque and lateral load among the three.

[0021] Furthermore, a chuck is installed on the drilling platform through a universal joint, a compensating hydraulic cylinder is installed on the chuck, the compensating hydraulic cylinder is sleeved outside the suspension short section, and a telescopic end of the compensating hydraulic cylinder is fixedly connected to the suspension short section.

[0022] The beneficial effect of adopting the above further solution is that the axial load generated by the heave movement is compensated by the compensating hydraulic cylinder, and at the same time, the compensating hydraulic cylinder is connected to the chuck through the flange, the chuck is connected to the universal joint, and finally sits on the drilling platform, which is easy to assemble.

[0023] Furthermore, the compensating hydraulic cylinder is connected to the chuck via a flange.

[0024] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and convenient assembly by connecting the compensating hydraulic cylinder and the chuck through the flange.

[0025] Furthermore, the platform body is a cylindrical structure.

[0026] The beneficial effect of adopting the above further solution is that the shape of the platform body is reasonably designed, which facilitates the assembly of various components.

[0027] Furthermore, a plurality of sensors for detecting relevant parameters of the platform's navigation in the ocean are evenly installed on the platform body.

[0028] The beneficial effects of adopting the above further scheme are simple structure and reasonable design. By setting up multiple sensors, relevant parameters during navigation can be obtained to facilitate subsequent safety analysis of the navigation speed of the suspended watertight pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the present invention when it is in working state;

[0031] Figure 3 It is a structural schematic diagram of the suspension short section in the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the wedge block in the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Suspension pup joint; 1-1. Protrusion; 1-2. Transition section; 2. Compensation hydraulic cylinder; 3. Chuck; 4. Universal joint; 5. Drilling platform; 6. Sprayer housing; 7. Riser; 8. Flange; 9. Wedge; 10. Centering mechanism; 11. Sensor; 12. Platform body. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0039] Example 1

[0040] like Figures 1 to 4As shown, this embodiment provides an anti-platform hard suspension device for a drilling watertight pipe, including a platform body 12, a suspension pup section 1, a watertight pipe 7 and a compressible centering mechanism 10, the top of the platform body 12 is provided with an opening that passes through from top to bottom, and a drilling platform 5 is fixedly installed at the opening; a mounting hole that passes through from top to bottom is provided at the center of the drilling platform 5; the suspension pup section 1 is vertically installed in the mounting hole, and its two ends extend to the outside of the mounting hole respectively, and the watertight pipe 7 is vertically fixedly installed at the lower end of the suspension pup section 1; the centering mechanism 10 is fixedly installed on the drilling platform 5, which is located below the mounting hole, and its fixed sleeve is arranged outside the suspension pup section 1.

[0041] During use, in the conventional technology, the watertight riser 7 needs to be removed in advance when the platform body 12 moves. However, the present embodiment utilizes a compressible centering mechanism 10 to buffer the watertight riser 7 during the movement of the platform body 12. This eliminates the need to remove the watertight riser 7 in advance, thereby saving time in lowering and recovering the watertight riser 7 and greatly improving operating efficiency.

[0042] Preferably, in this embodiment, the centering mechanism 10 is made of a slightly compressible elastic composite material, which can compensate for the bending moment and torque transmitted by part of the watertight pipe and limit the maximum rotation angle generated by the lower end of the suspension short section and the watertight pipe.

[0043] Preferably, in this embodiment, the suspension pup joint 1 is in a round tube structure, and its lower end is connected to the watertight pipe 7. During operation, liquid passes through the suspension pup joint 1 and the watertight pipe 7.

[0044] In addition, the compressible elastic composite material is preferably made of slightly compressible steel metal, such as alloy steel.

[0045] This embodiment improves the bending resistance of the watertight pipe. At the same time, the interference fit between the slightly compressible centering mechanism and the suspension pup section and the wedge block can achieve micro-bending and micro-torsion of the lower end of the suspension pup section, thereby achieving the purpose of releasing the bending moment and torque load of the watertight pipe, avoiding the transmission of bending moment and torque to the upper end of the suspension pup section and the compensation hydraulic cylinder, and ensuring the safety of the system.

[0046] Example 2

[0047] On the basis of Example 1, in this embodiment, a protrusion 1-1 is provided at the lower portion of the suspension short section 1, and the centering mechanism 10 is sleeved outside the protrusion 1-1.

[0048] The shape of the protrusion 1-1 is reasonably designed, and is used to change the force direction between the protrusion 1-1 on the suspension short section 1 and the slightly compressible centering mechanism 10, increase the force range and contact area, realize the release of the bending moment load, and limit the maximum rotation angle generated by the lower end of the suspension short section 1 and the watertight pipe 7, thereby avoiding the risk of the watertight pipe 7 colliding with the moon pool and the risk of collision between the column and the lower floating body.

[0049] Example 3

[0050] Based on Example 2, in this example, the protrusion 1-1 is ellipsoidal, and arc-shaped transition sections 1-2 are respectively provided on its upper and lower parts.

[0051] The shape of the above-mentioned protrusion 1-1 is reasonably designed to change the force direction between the protrusion 1-1 on the suspension nipple 1 and the slightly compressible centering mechanism 10, increase the force application range and contact area, realize the release of bending moment load, limit the maximum rotation angle generated at the lower end of the suspension nipple 1 and the riser 7, and avoid the risk of the riser 7 colliding with the moonpool and the risk of the column and the lower floating body colliding.

[0052] Example 4

[0053] Based on any one of Examples 2 to 3, in this example, multiple pairs of wedge blocks 9 are oppositely provided in the middle of the protrusion, and the multiple pairs of wedge blocks 9 are located inside the centering mechanism 10.

[0054] The setting of the wedge blocks 9 ensures that the protrusion 1-1 on the suspension nipple 1 and the slightly compressible centering mechanism 10 do not move up and down or slip off, ensures that the upper part of the suspension nipple 1 is in a vertical state, and at the same time realizes the release of torque load.

[0055] Preferably, in this example, the surface of each wedge block 9 in contact with the suspension nipple 1 is wedge-shaped.

[0056] Example 5

[0057] Based on Example 4, in this example, the number of the wedge blocks 9 is two pairs, and the two pairs of wedge blocks 9 are distributed in a cross shape.

[0058] The number of the wedge blocks 9 is reasonably designed to further improve the effect.

[0059] Alternatively, the number of the above-mentioned wedge blocks 9 can also be set to other appropriate numbers of pairs, such as four pairs.

[0060] Example 6

[0061] Based on the above-mentioned examples, in this example, a rotary sprayer housing 6 is fixedly connected to the outside of the centering mechanism 10, and the rotary sprayer housing 6 is fixedly connected to the drill floor 5.

[0062] This scheme has a simple structure and reasonable design. The rotary sprayer housing 6 and the protrusion 1-1 section of the suspension nipple 1 form an interference fit to ensure the effective transmission of torque and lateral load among the three.

[0063] Example 7

[0064] On the basis of the above embodiments, in this embodiment, a chuck 3 is installed on the drilling platform 5 through a universal joint 4, and a compensating hydraulic cylinder 2 is installed on the chuck 3. The compensating hydraulic cylinder 2 is sleeved outside the suspension short section 1, and its telescopic end is fixedly connected to the suspension short section 1.

[0065] This solution compensates the axial load caused by the heave movement through the compensating hydraulic cylinder 2. At the same time, the compensating hydraulic cylinder 2 is connected to the chuck 3 through the flange 8, and the chuck 3 is connected to the universal joint 4, and finally sits on the drilling platform 5, which is easy to assemble; here, the chuck 3 transmits torque through the universal joint 4 and performs a guiding role at the same time.

[0066] Example 8

[0067] On the basis of Example 7, in this embodiment, the compensating hydraulic cylinder 2 is connected to the chuck 3 via a flange 8 .

[0068] This solution has a simple structure and a reasonable design. The compensating hydraulic cylinder 2 and the chuck 3 are connected by the flange 8, and the assembly is convenient.

[0069] Example 9

[0070] On the basis of the above embodiments, in this embodiment, the platform body 12 is a cylindrical structure.

[0071] The shape of the platform body 12 is reasonably designed to facilitate assembly of various components.

[0072] Example 10

[0073] On the basis of the above embodiments, in this embodiment, a plurality of sensors 11 for detecting relevant parameters of the platform's navigation in the ocean are evenly installed on the platform body 12 .

[0074] The solution has a simple structure and a reasonable design. By setting up multiple sensors 11, relevant parameters during the navigation process can be obtained to facilitate the subsequent safety analysis of the navigation speed of the suspended watertight pipe.

[0075] Preferably, in this embodiment, the above-mentioned multiple sensors 11 are respectively installed at the bottom of the platform body 12 to facilitate the detection of relevant parameters.

[0076] In addition, the above-mentioned related parameters include platform heave acceleration, platform navigation speed and platform navigation direction, etc. At this time, the sensors 11 are respectively acceleration sensors, speed sensors and azimuth sensors in the prior art.

[0077] The working principle of the present invention is as follows:

[0078] During use, in the conventional technology, the watertight riser 7 needs to be removed in advance when the platform body 12 moves. However, the present embodiment utilizes a compressible centering mechanism 10 to buffer the watertight riser 7 during the movement of the platform body 12. This eliminates the need to remove the watertight riser 7 in advance, thereby saving time in lowering and recovering the watertight riser 7 and greatly improving operating efficiency.

[0079] The present invention has the following advantages:

[0080] ① The slightly compressible centering mechanism in the device of the present invention is composed of a slightly compressible elastic composite material, which can compensate for the bending moment and torque transmitted by part of the watertight pipe and limit the maximum rotation angle generated by the lower end of the suspension short section and the watertight pipe.

[0081] ② The setting of the thickened section (i.e., the protrusion) of the suspension pup joint in the device of the present invention can improve its rigidity, bending strength and torsional strength, and fully cope with the influence of small deformation of the suspension pup joint.

[0082] ③ The setting of the uniformly thickened transition section of the thickened section of the suspension pup joint in the device of the present invention can increase the contact area between the thickened section of the suspension pup joint and the slightly compressible centering mechanism; at the same time, when under the action of bending moment load, compared with the constant section setting, the characteristics of the variable cross-section can change the force direction and force range, and distribute the local force at the lower part of the constant cross-section to the transition section, thereby improving the safety factor of the suspension pup joint.

[0083] ④ The four wedge blocks symmetrically arranged on the outer wall of the thickest section of the suspension pup section in the device of the present invention can ensure that the thickened section of the suspension pup section and the slightly compressible centering mechanism do not move up and down or slip; at the same time, when the watertight pipe is subjected to torque generated by the current load, the four symmetrically distributed wedge blocks can realize torque compensation of the thickened section of the suspension pup section and the slightly compressible centering mechanism.

[0084] It should be noted that all electronic components involved in the present invention adopt the existing technology, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the existing technology.

[0085] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0086] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hard suspension device for preventing tumbling of drilling risers. Features: It comprises a platform body (12), a suspension pup joint (1), a watertight pipe (7) and a compressible centering mechanism (10); the top of the platform body (12) is provided with an opening extending upward and downward, and a drilling platform (5) is fixedly installed at the opening; a mounting hole extending upward and downward is provided at the center of the drilling platform (5); the suspension pup joint (1) is vertically installed in the mounting hole, and its two ends extend out of the mounting hole respectively, and the watertight pipe (7) is vertically fixedly installed at the lower end of the suspension pup joint (1); the centering mechanism (10) is fixedly installed on the drilling platform (5), and is located below the mounting hole, and its fixed sleeve is arranged outside the suspension pup joint (1).

2. The anti-platform hard suspension device for drilling riser according to claim 1, Features: A protrusion (1-1) is provided at the lower part of the suspension short section (1), and the centering mechanism (10) is sleeved outside the protrusion (1-1).

3. The anti-platform hard suspension device for drilling riser according to claim 2, Features: The protrusion (1-1) is ellipsoidal in shape, and its upper part and lower part are respectively provided with arc-shaped transition sections (1-2).

4. The anti-platform hard suspension device for drilling riser according to claim 2, Features: A plurality of pairs of wedge blocks (9) are arranged opposite to each other in the middle of the protrusion (1-1), and the plurality of pairs of wedge blocks (9) are located in the centering mechanism (10).

5. The anti-platform hard suspension device for drilling riser according to claim 4, Features: The number of the wedge blocks (9) is two pairs, and the two pairs of wedge blocks (9) are distributed in a cross shape.

6. The anti-platform hard suspension device for drilling riser according to any one of claims 1 to 5, Features: The centering mechanism (10) is fixedly connected to a nozzle housing (6) outside, and the nozzle housing (6) is fixedly connected to the drilling platform (5).

7. The anti-platform hard suspension device for drilling riser according to any one of claims 1 to 5, Features: A chuck (3) is mounted on the drilling platform (5) via a universal joint (4), a compensating hydraulic cylinder (2) is mounted on the chuck (3), the compensating hydraulic cylinder (2) is sleeved outside the suspension short section (1), and a telescopic end of the compensating hydraulic cylinder is fixedly connected to the suspension short section (1).

8. The anti-platform hard suspension device for drilling riser according to claim 7, Features: The compensating hydraulic cylinder (2) is connected to the chuck (3) via a flange (8).

9. The anti-platform hard suspension device for drilling riser according to any one of claims 1 to 5, Features: The platform body (12) is in a cylindrical structure.

10. The anti-platform hard suspension device for drilling riser according to any one of claims 1 to 5, Features: A plurality of sensors (11) for detecting relevant parameters of the platform's navigation in the ocean are evenly spaced and installed on the platform body (12).

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