CN112478050A

CN112478050A - A buffer stop for semi-submerged formula production platform center pillar oil tank

Info

Publication number: CN112478050A
Application number: CN202011447033.2A
Authority: CN
Inventors: 李达; 冯加果; 贾旭; 苏云龙; 易丛; 梁文洲; 赵晶瑞
Original assignee: Beijing Research Center of CNOOC China Ltd; CNOOC China Ltd
Current assignee: Beijing Research Center of CNOOC China Ltd; CNOOC China Ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-03-12
Anticipated expiration: 2040-12-09
Also published as: CN112478050B

Abstract

The invention discloses an anti-collision device for an oil tank of a middle upright column of a semi-submersible production platform. The anti-collision device comprises an oil cabin wall, an outer wall and a plurality of horizontal plates; the oil tank wall and the outer wall are sequentially arranged around the oil tank from inside to outside, and the oil tank wall and the outer wall are connected through the horizontal plates. The anti-collision device occupies less space, saves steel, and can stably prevent collision and protect oil substances stored in the column-stabilized platform columns with multiple columns.

Description

A buffer stop for semi-submerged formula production platform center pillar oil tank

Technical Field

The invention relates to an anti-collision device for a column oil tank in a semi-submersible production platform, and belongs to the field of structural design of floating platforms in ocean engineering.

Background

As the development of marine oil and gas moves to deeper and more distant areas, the problem of how to dispose of the oil products produced in the gas field production is faced, and the oil products produced need to be stored at the platform because it is uneconomical to build new pipelines for such oil products separately at an offshore distance or because the surrounding pipe network is not suitable for transporting oil. In the production of deepwater gas fields, a multi-column type column-stabilized platform is a better choice, such as a semi-submersible platform, but when oil products are stored on the semi-submersible platform, the oil products are required to meet the safety requirement, and the most basic requirement is that an anti-collision structure is required to be arranged around an oil tank.

The tank of a conventional ship-type tanker is also surrounded by crash-proof structures for the cofferdams, but the multi-column type spar platforms are somewhat different when storing oil products in the columns, and also suffer from problems. In the oil tank anti-collision structure of the traditional oil tanker, as the cabin and the surrounding space of the oil tanker are sufficient and the requirement of load regulation is met, a separation tank with relatively large space, such as more than 4.5m, is arranged around the oil tank of the traditional ship-type oil tanker, so that the oil tank wall and the outer wall of the separation tank can be respectively provided with the stiffening material and the truss material through the related structural design; and set up the oil tank in the stand, compare with the oil ship, the stand space is little, the width is generally just also 15-25m, if it is unrealistic to go both sides to set up the isolation tank according to the mode of oil ship, the space is not enough, consequently, need the innovation, reduce the interval of isolation tank, too big wasted space, too little the effect that can not play collision protection, simultaneously, because the space has reduced, the oil tank also needs the innovation with the relevant structural design of isolation tank outer wall, if set up the structure that the purlin can lead to the design respectively at oil cabin wall and isolation tank outer wall according to traditional mode and be close, be similar to "iron knot", it is uneconomical unreasonable, also be inconvenient for the aggregate to arrange, weld etc..

Therefore, aiming at the requirement of collision prevention at the periphery of the oil storage tank of the upright column and the characteristics of the oil storage tank, the traditional structural design mode can not meet the requirement, is obviously uneconomical or unreasonable, and provides a reasonable and economic design scheme of the collision prevention structure at the periphery of the oil storage tank of the upright column according to the characteristics that the space of the upright column is limited and collision protection is required, so that the storage safety of oil products is ensured.

Disclosure of Invention

The invention aims to provide an anti-collision device for an upright post oil tank in a semi-submersible production platform, which occupies less space, saves steel, and can stably prevent collision and protect oil substances stored in upright posts of a multi-upright post stable platform.

The invention provides an anti-collision device for a middle upright post oil tank of a semi-submersible production platform, which comprises an oil tank wall, an outer wall and a plurality of horizontal plates;

the oil tank wall and the outer wall are sequentially arranged around the oil tank from inside to outside, and the oil tank wall and the outer wall are connected through the horizontal plates.

In the invention, the oil tank wall and the outer wall are connected through the horizontal plate arranged in the horizontal direction, and the horizontal T-shaped steel arranged on the outer wall and the oil tank wall in the traditional design is replaced, so that the problems of insufficient oil storage space, mutual interference and increased steel plate thickness in the upright column are solved, and the steel is also saved.

In the above anti-collision device, a distance between the oil tank wall and the outer wall may be 1.5 to 2m, and specifically may be 1.8 m; the above-mentioned spacing enables a more stable connection between the tank wall and the outer wall and facilitates the arrangement of the horizontal plates.

In the above anti-collision device, the anti-collision device further includes a plurality of manholes, and the manholes are disposed between the tank wall and the outer wall and near the horizontal plate; the manhole is arranged to be used as an overhaul channel for facilitating structural overhaul and liquid flow between two layers of the horizontal plates, and the manhole also has the function of using the space as a ballast water tank.

In the above-described anti-collision device, the horizontal plate is provided in a horizontal direction between the tank wall and the outer wall;

more than one layer of the horizontal plates can be arranged in the vertical direction of the oil tank wall and the outer wall.

In the anti-collision device, a certain distance is vertically arranged between two layers of the horizontal plates, and the distance can be 1.8-2.4 m.

In the above-mentioned anti-collision device, the anti-collision device further comprises a plurality of reinforcing materials;

the strengthening materials are arranged on the opposite side walls of the oil bulkhead and the outer wall respectively along the longitudinal direction, and the strengthening materials are arranged at intervals along the circumferential direction of the oil bulkhead and the outer wall.

In the above-mentioned anti-collision device, the distance between the reinforcing materials may be 600mm to 750 mm.

In the above-mentioned anti-collision device, the anti-collision device further comprises a plurality of reinforcing ribs;

the reinforcing ribs are arranged between the oil tank wall and the outer wall at intervals; the ribs prevent the horizontal plate from buckling due to the compression of the tank wall 2 and the outer wall 1.

In the above anti-collision device, the anti-collision device further includes an isolation cabin structure, the isolation cabin structure is disposed around the oil tank and connected to the outer wall; the isolation cabin structure occupies less space and plays a role in protection.

The invention has the following advantages:

1. the invention can play a good collision protection role for oil substances stored in the upright post by the design technology of two layers of outer walls and 1.8m isolation space;

2. the space of the upright post is precious, the scheme of 1.8m of separation distance provided by the invention can not only effectively utilize the space to play a protection role, but also can replace bulkheads on two sides by the horizontal truss material to design the truss material at the same time, thereby not only fully utilizing the space, solving the problems of insufficient space, mutual interference and increased steel plate thickness when the T-shaped steel materials are arranged on two sides of a narrow space at the same time, but also saving the steel materials;

3. the scheme provided by the invention can effectively meet the requirements of the overhaul space and the channel of the structure, can meet the requirement of liquid flow, and has the function of a ballast water tank.

Drawings

Fig. 1 is a schematic cross-sectional view of a pillar type external-tank collision avoidance device according to the present invention.

The individual labels in the figure are as follows:

1, outer wall; 2 an oil tank wall; 3, horizontal plates; 4, strengthening the material; 5, a manhole; 6, reinforcing ribs; and 7. an oil tank.

Detailed Description

The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.

For a multi-upright-column stable platform, when oil substances need to be stored in the upright columns, the oil tank anti-collision device can be designed around the oil tank by adopting the following scheme. The implementation is described by taking one of the upright post anti-collision devices outside the oil tank as an example. Fig. 1 is a schematic cross-sectional view of a pillar outboard bumper of the present invention. The anti-collision device comprises an oil tank wall 2, an outer wall 1 and a plurality of horizontal plates 3; the oil tank wall 2 and the outer wall 1 are sequentially arranged around the oil tank 7 from inside to outside and are connected with each other through a horizontal plate 3.

Different from the oil storage device of other ship types, the oil storage device has more space in the cabin, the space is limited and valuable, because the width of the upright post is limited, the isolation cabin arranged around the oil cabin 7 is not too large, the occupation of too much space is avoided, and the protection effect is realized, a certain distance is arranged between the oil cabin wall 2 and the outer wall 1 in the design, the distance is specifically 1.5-2 m, and more specifically 1.8m, so that on one hand, the space can be designed without considering the oil cabin and the isolation cabin to break the cabin together when stability calculation is carried out, and the specification requirement is met; on the other hand, the interval of design is convenient for realize the design of connection structure between tank wall 2 and outer wall 1 like this, adopt horizontal panel 3 to connect tank wall 2 and outer wall 1, thereby can be in the horizontal direction of tank wall 2 and outer wall 1 not setting up purlin (Girder), adopt 1.8m wide horizontal panel 3 to replace the purlin that sets up respectively in tank wall 2 and outer wall 1 horizontal direction in traditional design in other words, solved narrow space both sides simultaneously and set up the purlin space not enough like this, the problem of mutual interference and the thick increase of steel board, steel has still been saved. Further, since a certain distance (width is 1.8m) is provided between the tank wall 2 and the outer wall 1, no strengthening material is required to be arranged on the horizontal plate 3, that is, the horizontal plate 3 is not required to be taken as a horizontal tank wall, and the reinforcing ribs 6 are arranged between the tank wall 2 and the outer wall 1 at certain intervals for preventing the horizontal plate 3 from buckling due to the extrusion of the tank wall 2 and the outer wall 1.

Further, a horizontal plate 3 is provided in the horizontal direction between the cargo tank wall 2 and the outer wall 1; more than one layer of the vertical upper horizontal plates 3 along the oil tank wall 2 and the outer wall 1 can be arranged. The horizontal plates 3 are vertically spaced at a predetermined distance. A layer is arranged at a certain height, the height can be selected by comprehensively considering the wall thickness of the oil bulkhead 2 and the outer wall 1 and other factors in a pressure head design mode, and the specification requirements can be met, specifically, the interval is 1.8m-2.4 m.

Further, in order to facilitate structural maintenance and liquid flow between the two layers of horizontal plates 3, a manhole 5 is arranged at a certain distance from the horizontal plates 3 to serve as a maintenance channel, and meanwhile, the function of taking the space as a ballast water tank is realized.

Further, the opposite side walls of the oil tank wall 2 and the outer wall 1 are respectively provided with strengthening materials in the longitudinal direction, the strengthening materials are arranged in the longitudinal direction and are arranged at intervals in the circumferential direction, and the distance between the strengthening materials can be 600-750 mm.

Through the design, thereby the isolation cabin structure with the interval of 1.8m is arranged around the oil cabin 7, the isolation cabin structure is arranged around the oil cabin 7 and is connected with the outer wall 1, the collision protection effect is achieved, meanwhile, the influence on cabin stability checking is also considered in the design, the design of the oil cabin wall 2 and the horizontal truss material of the outer wall 1 is ingeniously simplified, and the problem that the small-space structure design easily becomes the iron lump is solved.

The above embodiments are only for illustrating the present invention, and all equivalent changes and modifications made on the basis of the technical solutions of the present invention should not be excluded from the scope of the present invention.

Claims

1. The utility model provides an buffer stop for semi-submerged formula production platform center pillar oil tank which characterized in that: the anti-collision device comprises an oil cabin wall, an outer wall and a plurality of horizontal plates;

2. The crash structure as recited in claim 1, wherein: the distance between the oil tank wall and the outer wall is 1.5-2 m.

3. The crash structure as claimed in claim 1 or 2, wherein: the anti-collision structure further comprises a plurality of manholes, and the manholes are formed between the oil tank wall and the outer wall and are close to the horizontal plate.

4. A collision avoidance device according to any one of claims 1-3, wherein: the horizontal plate is arranged in a horizontal direction between the oil tank wall and the outer wall;

5. The bump guard of claim 4, wherein: the two layers of horizontal plates are vertically spaced at a certain distance, and the distance can be 1.8-2.4 m.

6. The bump guard of any of claims 1-5, wherein: the anti-collision device also comprises a plurality of strengthening materials;

7. The bump guard of claim 6, wherein: the distance between the reinforcing materials is 600 mm-750 mm.

8. The bump guard of any of claims 1-7, wherein: the anti-collision device also comprises a plurality of reinforcing ribs;

the reinforcing ribs are arranged between the oil tank wall and the outer wall at intervals.

9. The bump guard of any of claims 1-8, wherein: the anti-collision device further comprises an isolation cabin structure, wherein the isolation cabin structure is arranged around the oil cabin and is connected with the outer wall.