CN113884289B - End part restraint device for deep water steel catenary riser contact section test platform - Google Patents

Abstract

The embodiment of the invention discloses an end part restraint device for a deepwater steel catenary riser contact section test platform, which comprises an installation frame, an installation block and a fixture block, wherein the fixture block is rotatably connected to the installation block along the circumferential direction, and an installation flange is arranged on one side of the fixture block, which is far away from the installation block; the mounting block is connected with the inner wall of the mounting frame through a plurality of linear springs, and the axial directions of at least two linear springs are different; a plurality of sections of arc-shaped slotted holes are formed in the end face, used for mounting the clamping block, of the mounting block along the circumferential direction, bending springs with elastic directions identical to the extending directions of the arc-shaped slotted holes are detachably embedded in the arc-shaped slotted holes, one end of each bending spring abuts against one end face of each arc-shaped slotted hole, and the other end of each bending spring abuts against the side face, located in each arc-shaped slotted hole, of the clamping block. Through the arrangement, specificity adjustment can be carried out on different stand pipes, pertinence simulation is effectively realized, the difference between a simulation result and an actual result is greatly reduced, and the accuracy is improved.

Description

End restraint for deepwater steel catenary riser touchdown test platform

technical field

Embodiments of the present invention relate to the field of experimental devices for steel catenary risers for offshore oil and gas development, in particular to an end restraint device used for a test platform of a deep-water steel catenary riser touching the ground.

Background technique

With the increasing demand for energy in various countries, people have turned their attention to offshore oil and gas resources since the last century. As a key part of the development of offshore oil and gas resources, my country's current research on steel catenary risers is still in its infancy. Due to the complex marine environment, steel catenary risers may be damaged during installation and service, resulting in severe environmental disasters and huge economic losses. It is of great significance to carry out relevant tests on deepwater steel catenary risers.

During the test, in order to study the actual motion and stress state of the riser, the riser needs to move with multiple degrees of freedom. However, the steel catenary riser has a long contact section, and the riser must be truncated during the test. Therefore, it is necessary to simulate the restraint of the riser at the truncation to better conform to the reality and ensure the accuracy of the test results.

SUMMARY OF THE INVENTION

To this end, the embodiments of the present invention provide an end restraint device for a test platform of a deep-water steel catenary riser at the ground contact section, which simulates restraint on multiple degrees of freedom by using a combination of linear springs and bending springs, and According to different touchdown lengths and material properties, targeted adjustments are made to achieve specific adjustment of different risers, effectively realizing targeted simulation, greatly reducing the difference between simulation results and actual results, and improving accuracy.

In order to achieve the above object, embodiments of the present invention provide the following technical solutions:

An embodiment of the present invention provides an end restraint device for a test platform of a deep-water steel catenary riser contacting the ground, comprising a mounting frame, and a mounting block arranged in the mounting frame and rotatably connected to the A clamping block on the installation block, and a side of the clamping block away from the installation block is provided with an installation flange for connecting the end of the deep-water steel catenary riser; wherein,

The mounting block and the inner wall of the mounting frame are connected by a plurality of linear springs, and at least two of the linear springs have different axial directions;

A plurality of arc-shaped slot holes are formed along the circumferential direction on the end surface of the installation block for installing the clamping block, and the arc-shaped slot holes are detachably fitted with elastic direction and the arc-shaped slot holes. A bending spring with the same extension direction, one end of the bending spring abuts on one end surface of the arc-shaped slot hole, and the other end abuts on the side surface of the clamping block located in the arc-shaped slot hole.

As a preferred solution of the present invention, the mounting frame includes a backing plate located on a side of the mounting block away from the clamping block, and extending from both ends of the backing plate along the axis of the mounting flange the side panels; and,

The back plate and the two side plates are respectively connected with the mounting block by a linear spring, and the axis of the linear spring is parallel or perpendicular to the axis of the mounting flange.

As a preferred solution of the present invention, the mounting block includes a coaxial connecting portion and a clamping portion arranged in sequence from a side close to the back plate, the connecting portion is formed into a block structure, and the clamping portion formed into a disc-like structure; and,

the linear spring is connected to the connecting portion;

The arc-shaped slot hole is formed on the end surface of the clipping portion facing away from the connecting portion.

As a preferred solution of the present invention, the clamping block includes a clamping segment for clamping into the arc-shaped slot hole, and an installation segment extending from the clamping segment away from the installation block, so The mounting flange is arranged on the mounting section; wherein,

The clamping segment includes clamping plates arranged opposite to each other and formed with a gap, a fitting groove is formed on the opposite sides of the two clamping plates, and one of the arc-shaped groove holes is close to the central axis of the clamping block. The end surface of the side close to the clamping block is formed to protrude outward in the radial direction as an arc-shaped clamping protrusion, and the fitting groove is fitted in the arc-shaped clamping protrusion.

As a preferred solution of the present invention, the end face of the mounting block formed with the arc-shaped slot hole is recessed inward along the radial direction to form a accommodating cavity, and a set of opposite arc-shaped convex plates are arranged in the accommodating cavity, and two The arc-shaped convex plates are connected by a telescopic piece, so that the two arc-shaped convex plates can approach or move away from each other, and the two arc-shaped convex plates can be moved in the radial direction until the ends are located in the in the arc-shaped slot hole and formed into the arc-shaped snap protrusion;

The end face of the arc-shaped convex plate is concavely formed with a plurality of clamping grooves for clamping the fitting grooves.

As a preferred solution of the present invention, the telescopic element comprises a rotating tube which is rotatably arranged in the receiving cavity and whose inner wall is formed with an internal thread, and a group of externally threaded pipes screwed into the rotating tube, and a guide bar disposed in the accommodating cavity for restricting the rotation of the externally threaded pipe, and the two externally threaded pipes respectively extend from one end of the rotating pipe to a part located outside the rotating pipe, and the two externally threaded pipes The arc-shaped convex plates are respectively connected to one of the externally threaded pipes.

As a preferred solution of the present invention, the helical directions of the external threads on the two externally threaded pipes are opposite.

Embodiments of the present invention have the following advantages:

1. The end restraint device provided by the present invention can provide restraint with multiple degrees of freedom, and better simulate the actual restraint of the test pipe fittings;

2. When replacing different test pipe fittings, the stiffness and length of the linear spring and bending spring can be adjusted in a targeted manner to realize the degeneration simulation of the restraint at the end, and better target the different test pipe fittings. Simulation, improve accuracy, and the overall replacement is relatively simple, can be easily operated;

3. When the overall test conditions and purposes are changed, the end restraint device can be adjusted or replaced as a whole, which is convenient for the convenient replacement and adjustment of the actual test operation process.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning above, any modification of the structure, the change of the proportional relationship or the adjustment of the size should still fall within the technical content disclosed in the present invention without affecting the effect and the purpose that the present invention can produce. within the range that can be covered.

FIG. 1 is a schematic structural diagram of an end restraint device provided by an embodiment of the present invention;

2 is a front view of an end restraint device provided by an embodiment of the present invention;

3 is a schematic diagram of a partial structure of an end restraint device provided by an embodiment of the present invention;

4 is a schematic diagram of a partial structure of a mounting block and a clamping block provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of one of the clamping segments provided by an embodiment of the present invention;

6 is a schematic structural diagram of a mounting flange provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a partial internal structure of a clamping portion provided by an embodiment of the present invention.

In the picture:

1- Concrete platform; 2- Test pipe fitting; 3- Bottom plate; 4- Bolt; 5- Pipe fitting flange; 6- Mounting flange; 7- Mounting block; 8- Clamp block; 9- Linear spring; 10- Bending spring; 11-back plate; 12-side plate; 13-connecting part; 14-clamping part; 15-arc slotted hole; 16-clamping section; 17-installation section;

141-arc convex plate; 142-card slot; 143-rotating pipe; 144-external thread pipe; 145-guide bar;

161-card plate; 162-fitting groove.

Detailed ways

The embodiments of the present invention are described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The following is further elaborated through specific embodiments.

As shown in Fig. 1-Fig. 7, the present invention provides an end restraint device for a test platform of a deep-water steel catenary riser contacting the ground, the end restraint device can be connected to the concrete platform 1 in a detachable manner , to facilitate the replacement and adjustment of the end restraint. For example, in a preferred embodiment, the end restraint device can be installed on the bottom plate 3, and the bottom plate 3 and the concrete platform 1 can be installed in a detachable manner through bolts 4, so that the entire end The restraint device is detachably arranged with respect to the concrete platform 1 .

Further, the end restraint device includes a mounting frame formed by the cooperation of the back plate 11 and the side plate 12 , a mounting block 7 connected to the inner wall of the mounting frame by a linear spring 9 , and a clamping block that is clamped on the mounting block 7 . 8, and the side of the clamping block 8 away from the mounting block 7 is provided with a mounting flange 6, and the mounting flange 6 is used to connect with the pipe fitting flange 5 at the end of the test pipe fitting 2 to realize the positioning and installation of the test pipe fitting 2. At the same time, a plurality of arc-shaped slot holes 15 are formed along the circumferential direction on the end surface of the mounting block 7 for installing the clamping block 8, and the arc-shaped slot holes 15 are detachably fitted with the extension of the elastic direction and the arc-shaped slot holes 15. For the bending springs 10 in the same direction, one end of the bending spring 10 abuts on one end surface of the arc-shaped slot 15 , and the other end abuts on the side of the clip 8 located in the arc-shaped slot 15 . Of course, the mounting flange 6 and the pipe fitting flange 5 can be connected by bolts 4 here. It should be further noted that the mounting block 7 formed with the arc-shaped slot 15 can provide torsional rigidity.

In a more preferred embodiment, the above-mentioned linear springs 9 and bending springs 10 are detachably arranged, so that the stiffness of the springs can be better selected according to the test requirements. The detachable arrangement of the linear spring 9 and the bending spring 10 here can be in any suitable manner, for example, it can be installed through a steel plate detachably installed in the mounting frame and the arc-shaped slot hole 15, and the above-mentioned springs can be welded with the steel plate. , the steel plate can be detachably installed in the installation frame and the arc-shaped slot hole 15 by means of screws or the like.

In order to better improve the stability of the overall structure, the structure of the part of the mounting block 7 formed with the arc-shaped slot holes 15 can be further specifically limited as follows: there are two arc-shaped slot holes 15, which are symmetrical with the midpoint of the mounting block 7 Arrangement, one end of the bending spring 10 is connected to one end wall of the arc-shaped slot 19 , and the other end is connected to the clamping block 8 . Of course, the connection method here can be further selected as welding.

At the same time, further, in order to enable the clamping block 8 to be better clamped and the length of the bending spring 10 to be adjusted according to the actual situation, so as to realize the adjustment of the torsion force, the end face of the installation block 10 formed with the arc-shaped slot hole 15 is radially A accommodating cavity is formed by concave inward in the direction, and a set of opposite arc-shaped convex plates 141 are arranged in the accommodating cavity. Close to or away from each other, and the two arc-shaped convex plates 141 can move in the radial direction until the ends are located in the arc-shaped slot holes 15 and are formed into arc-shaped snap protrusions; The engaging slot 142 of the engaging slot 162 is engaged. The telescopic element includes a rotating tube 143 which is rotatably disposed in the accommodating cavity and whose inner wall is formed as an internal thread, a group of externally threaded pipes 144 screwed into the rotating tube 143, and a set of externally threaded pipes 144 disposed in the accommodating cavity for constraining the externally threaded pipe. 144 is a self-rotating guide bar 145, and two externally threaded pipes 144 respectively extend from one end of the rotating pipe 143 to part of the outside of the rotating pipe 143, and two arc-shaped convex plates 141 are respectively connected to one of the externally threaded pipes 144. . The helical directions of the external threads on the two externally threaded pipes 144 are opposite. Of course, the end face provided with the telescopic element here can be formed to be open, and the installation section 17 can be connected with the clip section 16 while forming a certain gap, so as to facilitate the rotational adjustment of the rotating tube 143 . In the above setting method, during the adjustment process, by rotating the rotating tube 143, the arc-shaped convex plate 141 can be received into the accommodating cavity. At least part of it is moved to the outside of the accommodating cavity, and the positioning and engaging are effectively realized through the cooperation between the locking groove 142 and the locking block 8 . In addition, the length of the bending spring 10 can be adjusted by arranging a plurality of card slots 142 .

During the test, the test pipe fitting 2 floated on the soil. After numerical calculation, the movement displacement of the end restraint end of the test pipe fitting 2 was small, so the spring with stronger stiffness was sufficient to restrain it. The eight springs connected to the mounting block 7 limit the axial, radial and vertical displacement of the test tube 2 and the radial and vertical rotation around the test tube 2 . When the test tube 2 rotates around the axial direction, the bending spring 10 on the clamping portion 14 is either stretched or compressed, thus constraining the twist of the test tube 2 in this direction. When studying different test tubes 2 or different problems, the linear spring 9 and/or the bending spring 10 can be replaced, or the upper end restraint device can be disassembled or replaced as a whole to match the new test target.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (7)

1. an end restraint device for a test platform of a deep-water steel catenary riser touching the ground, it is characterized in that, comprise a mounting frame, be arranged on the mounting block (7) of the described mounting frame, rotatable along the circumferential direction A clamping block (8) connected to the mounting block (7), and the side of the clamping block (8) away from the mounting block (7) is provided with an end portion for connecting the deep-water steel catenary riser the mounting flange (6); of which, The mounting block (7) and the inner wall of the mounting frame are connected by a plurality of linear springs (9), and at least two of the linear springs (9) have different axial directions; A plurality of arc-shaped slot holes (15) are formed along the circumferential direction on the end surface of the mounting block (7) for mounting the clamping block (8), and the arc-shaped slot holes (15) are detachably embedded in the A bending spring (10) whose elastic direction is the same as the extending direction of the arc-shaped slot hole (15) is combined, and one end of the bending spring (10) abuts on one of the end surfaces of the arc-shaped slot hole (15) , and the other end abuts on the side surface of the clamping block (8) located in the arc-shaped slot hole (15). 2. An end restraint device according to claim 1, characterized in that the mounting frame comprises a back plate (11) located on the side of the mounting block (7) away from the clamping block (8) , and side plates (12) extending from both ends of the back plate (11) along the axial direction of the mounting flange (6); and, The back plate (11) and the two side plates (12) are respectively connected with the mounting block (7) by a linear spring (9), and the axis of the linear spring (9) is connected to the The axes of the mounting flanges (6) are parallel or perpendicular. 3. An end restraint device according to claim 2, characterized in that the mounting block (7) comprises a coaxial connecting portion (13) arranged in sequence from a side close to the back plate (11) ) and a clamping part (14), the connecting part (13) is formed into a block structure, and the clamping part (14) is formed into a disc-shaped structure; and, The linear spring (9) is connected to the connecting portion (13); The arc-shaped slot hole (15) is formed on the end surface of the clamping portion (14) away from the connecting portion (13). 4. An end restraint device according to any one of claims 1-3, characterized in that the clamping block (8) comprises a clamping block (8) for being clamped in the arc-shaped slot hole (15) A snap-fit section (16), and a mounting section (17) extending away from the mounting block (7) from the snap-fit section (16), the mounting flange (6) is arranged on the mounting section (17) ) on; in which, The clamping section (16) includes clamping plates (161) arranged opposite to each other and forming a gap, and a fitting groove (162) is formed on the opposite sides of the two clamping plates (161). The arc-shaped grooves The end face of the hole (15) close to the central axis of the clamping block (8) on the side close to the clamping block (8) protrudes outward in the radial direction to form an arc-shaped clamping protrusion, and the fitting groove (162) is fitted in the arc-shaped latching protrusion. 5. An end restraint device according to claim 4, characterized in that the end surface of the mounting block (7) formed with the arc-shaped slot hole (15) is recessed inward along the radial direction to form a accommodating cavity, so A set of opposite arc-shaped convex plates (141) are arranged in the accommodating cavity, and the two arc-shaped convex plates (141) are connected by a telescopic piece, so that the two arc-shaped convex plates (141) can be approaching or moving away from each other, and the two arc-shaped convex plates (141) can be moved in the radial direction until their ends are located in the arc-shaped slot holes (15) and formed into the arc-shaped snap-on protrusions; The end surface of the arc-shaped convex plate (141) is concavely formed with a plurality of engaging grooves (142) for engaging the fitting grooves (162). 6. An end restraint device according to claim 5, characterized in that, the telescopic member comprises a rotating tube (143) which is rotatably disposed in the accommodating cavity, and whose inner wall is formed as an internal thread, and the screw A set of externally threaded pipes (144) connected to the rotating pipe (143), and a guide bar (145) disposed in the accommodating cavity for restricting the rotation of the externally threaded pipe (144), and two Each of the externally threaded pipes (144) extends from one end of the rotating pipe (143) to a part that is located outside the rotating pipe (143), and the two arc-shaped convex plates (141) are respectively connected to one of them. root on the externally threaded pipe (144). 7. An end restraint device according to claim 6, characterized in that the helical directions of the external threads on the two externally threaded pipes (144) are opposite.

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