CN112594466A

CN112594466A - Flexible riser bending reinforcement device with rubber protection socket

Info

Publication number: CN112594466A
Application number: CN202011410345.6A
Authority: CN
Inventors: 吴凡蕾; 余杨; 余建星; 傅一钦; 尤敏杰; 江思萱
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-04-02

Abstract

The invention provides a flexible riser bending strengthener with a rubber protective sleeve interface, comprising a main body sleeve for wrapping the outer wall of the flexible riser and a rubber protective sleeve interface. The ends are the A end with a larger cross-sectional size and the B end with a smaller cross-sectional size; the A end of the main body sleeve has an annular bottom surface, and a plurality of first notches are distributed at intervals around the annular bottom surface. There is an A-end through hole for convenient screw penetration, and a concave platform is arranged at the annular bottom of the A-end to fix the flexible riser; a plurality of second notches are distributed on the outer surface of the B-end at intervals. There is a B-end through hole for convenient screw penetration; the rubber protective sleeve interface is a hollow cylinder structure, and the outer wall of the rubber protective sleeve interface is close to the B end according to the same interval and size as the second notch of the B end. The corresponding protective sleeves are distributed The notch, the through hole on the protective sleeve notch corresponds to the through hole on the second notch. The present invention can avoid bending damage of the connecting portion of the riser.

Description

Flexible riser bending reinforcement device with rubber protection socket

Technical Field

The invention relates to a deep sea flexible riser bending reinforcer with a rubber protective sleeve, and belongs to the field of marine engineering flexible hose protection.

Background

The deep sea flexible riser is a key part in a deep sea oil and gas exploitation system and is a bridge between an ocean platform and a seabed oil field. The flexible vertical pipe has strong plasticity and can adapt to severe environmental loads, so the flexible vertical pipe is often applied to deep sea oil and gas exploitation. The bending capacity is strong, and the joint with the floating body or the pipeline joint is easy to bend and is locally damaged, so a bending reinforcer is required to be arranged at a locally vulnerable position to avoid damage. The traditional bending reinforcer has slightly higher rigidity at the outlet of the pipeline, is easy to abrade the outer surface of the vertical pipe, and the pipeline is also easy to generate stress concentration at the point, so that bending or extrusion occurs, and the fatigue life of the pipeline is shortened.

Therefore, a new bend stiffener with a stiffness transition exit is needed to solve the above problems.

Disclosure of Invention

The invention provides a deep sea flexible riser bending reinforcer with a rubber protection socket, which can reduce stress concentration generated by abrupt rigidity change at an outlet of the reinforcer and reduce the probability of abrasion of a riser. The technical scheme is as follows:

a flexible riser bending reinforcer with a rubber protection sleeve joint comprises a main body sleeve 1 and a rubber protection sleeve joint 2, wherein the main body sleeve 1 is used for wrapping the outer wall of a flexible riser, and is characterized in that the main body sleeve 1 is of a three-section type hollow structure, the middle section of the main body sleeve is in a round table shape, and two ends of the main body sleeve are respectively an A end with a larger cross-sectional size and a B end with a smaller cross-sectional size; the end A of the main body sleeve 1 is provided with an annular bottom surface, a plurality of first notches 101 are distributed at intervals on the periphery of the annular bottom surface, end A through holes for facilitating penetration of screws are formed in the first notches, a concave table 103 is arranged at the annular bottom of the end A, and the inner diameter of the concave table 103 is determined according to the outer diameter of the flexible vertical pipe and is used for fixing the flexible vertical pipe; a plurality of second notches 104 are distributed on the outer surface of the end B at intervals, and a through hole 105 at the end B for facilitating the penetration of a screw is arranged in each second notch 104;

rubber protection cover interface 2 is the hollow cylinder structure, and its internal diameter size is confirmed according to flexible riser, and the outer wall of rubber protection cover interface 2 is close to B end and has corresponding protection cover notch 201 according to interval and the size distribution the same with B end second notch 104, and through-hole 202 on the protection cover notch 201 is corresponding with through-hole 105 on the second notch 104 to ensure that the screw can pass smoothly and link together rubber protection cover interface 2 and main part cover 1.

Preferably, the wall thickness of one end of the rubber protective sleeve joint 2 connected with the end A of the main body sleeve 1 is the maximum value, gradually decreases along the outlet wall thickness, and the wall thickness of the other end is the thinnest.

Preferably, the first notch at the A end and the second notch at the B end of the main body sleeve are uniformly arranged at intervals along the outer wall.

Preferably, the main body cover 1 is made of polyurethane.

The invention relates to a deep sea flexible riser bending reinforcer with a rubber protection socket, which has the following advantages:

1) the deep sea flexible riser bending reinforcer main body is simple to manufacture, adopts the three-section polyurethane main body formed by integral casting, has no fittings at the fixed end or the outlet end, does not consider the problems of stress concentration and the like caused by improper installation of fittings during casting, and improves the casting success rate.

2) The invention has simple installation and convenient disassembly. The fixed end and the outlet end of the bending reinforcing device are provided with notches which are uniformly arranged at intervals along the outer wall, and the reinforcing device or the rubber protective sleeve is fixed by passing through the notches through screws, so that the process is simple, time and labor are saved.

3) The fixed end of the reinforcing device is provided with the notches which are evenly spaced by 90 degrees, the thickness of the notches from the bottom of the reinforcing device is 10 centimeters, the bending reinforcing device can be fixed on the riser connector of the upper floating body through the design, and the two bending reinforcing devices can be connected in a mirror image mode at the connecting position of two sections of risers, so that the bending damage of the connecting part of the risers is avoided.

4) The wall thickness of the rubber protective sleeve joint is gradually reduced, so that the protective sleeve is ensured to be more consistent with the surface of the vertical pipe, the pressure of the wall thickness to the outer surface when the vertical pipe moves is reduced, and the abrasion of the outlet end to the vertical pipe is reduced.

Drawings

FIG. 1 is a schematic view of a rubber boot socket mounted on a bend stiffener;

FIG. 2 is a schematic bottom view of the bend stiffener;

fig. 3 is a schematic structural diagram of a rubber protective socket.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-2, the bending stiffener for deep sea flexible riser with rubber protective sleeve joint of the present invention includes an integrally cast three-section polyurethane main body sleeve 1 attached to and wrapping the outer wall of the flexible riser, and a rubber protective sleeve joint 2. The main body sleeve 1 is of a three-section hollow structure, the two ends of the main body sleeve are respectively an A end and a B end, 104 is a notch with 120-degree interval on the outer surface of the B end, as shown in fig. 2, a through hole 105 is arranged in the notch, and a screw can conveniently penetrate through the rubber protective sleeve interface 2 and the B end to be connected together through the screw. The A end of the bend stiffener body cover 1 is also evenly distributed with notches 101 spaced 90 degrees apart. The through holes 102 are formed in the notches to facilitate penetration of screws, the bending reinforcer is integrally fixed at the riser joint, and due to the sinking design of the through holes 102, the screws are less prone to damage caused by erosion corrosion of sea currents. In fig. 1 and 2, a recessed portion 103 is provided at the bottom of the a end of the bend stiffener body cover 1 for fixing the position.

In the invention, the rubber protective sleeve interface 2 is a key accessory for reforming an integral bending reinforcer and protecting a flexible vertical pipe. Rubber protective sheath interface 2 is solid rubber material, and the hollow cylinder structure, the wall thickness of being connected with A end is the maximum value, descends along export wall thickness gradually, so the total wall presents and descends progressively. The gradual thinning design of the wall thickness is to reduce the abrasion and extrusion of the stand pipe at the outlet end, ensure that the protective sleeve is more consistent with the surface of the stand pipe, reduce the pressure of the wall thickness to the outer surface when the stand pipe moves, and further reduce the abrasion of the outlet end to the stand pipe. The outer wall of the rubber protective sleeve interface 2 is also provided with three notches 201 at intervals of 120 degrees near the end B, the notches 104 at the end A are the same in size, and the through holes 202 on the notches 201 are communicated with the through holes 105 on the notches 104, so that screws can smoothly pass through the through holes to connect two components together.

When the device is installed, firstly, the bending reinforcer main body sleeve 1 and the rubber protective sleeve joint 2 are connected through the through hole 105 and the through hole 202 by three screws, the bending reinforcer is integrally sleeved outside the flexible vertical pipe, and the bending reinforcer is moved to a required position, such as the position between the vertical pipe and the upper floating body or the position between the two vertical pipes. The bend stiffener is integrally fixed by screws through holes 102 in the notch 101, completing the installation of the bend stiffener.

The installation position and the component size of the invention are determined according to actual working conditions.

Claims

1. A flexible riser bending stiffener with a rubber protection sleeve joint comprises a main body sleeve (1) and a rubber protection sleeve joint (2), wherein the main body sleeve (1) is used for wrapping the outer wall of a flexible riser and is characterized in that the main body sleeve (1) is of a three-section type hollow structure, the middle section of the main body sleeve is of a round table shape, and two ends of the main body sleeve are respectively an A end with a larger cross-sectional size and a B end with a smaller cross-sectional size; the A end of the main body sleeve (1) is provided with an annular bottom surface, a plurality of first notches (101) are distributed at intervals on the periphery of the annular bottom surface, an A end through hole for facilitating penetration of a screw is formed in each first notch, a concave table (103) is arranged at the annular bottom of the A end, and the inner diameter of each concave table (103) is determined according to the outer diameter of the flexible vertical pipe and used for fixing the flexible vertical pipe; a plurality of second notches (104) are distributed on the outer surface of the end B at intervals, and a through hole (105) at the end B for facilitating the penetration of a screw is arranged in each second notch (104);

rubber protection socket joint (2) are the hollow cylinder structure, and its internal diameter size is confirmed according to flexible riser, and rubber protection socket joint (2) outer wall is close to the B end and has corresponding protective sheath notch (201) according to interval and size distribution the same with B end second notch (104), and through-hole (202) on protective sheath notch (201) are corresponding with through-hole (105) on second notch (104) to ensure that the screw can pass smoothly and link together rubber protection socket joint (2) and main part cover (1).

2. A flexible riser bend stiffener according to claim 1 where the wall thickness of the end of the rubber protection socket (2) connected to the a-end of the body sleeve (1) is at its maximum, gradually decreasing along the outlet wall thickness and at its other end being at its thinnest.

3. The flexible riser bend stiffener of claim 1, wherein the first notch at the a end of the body sleeve is evenly spaced from the second notch at the B end along the outer wall.

4. Flexible riser bend stiffener according to claim 1 characterized by that the body casing (1) is made of polyurethane.