WO2020019559A1

WO2020019559A1 - Buoyancy tower platform and installation method therefor

Info

Publication number: WO2020019559A1
Application number: PCT/CN2018/113314
Authority: WO
Inventors: 潘徐杰
Original assignee: 惠生（南通）重工有限公司
Priority date: 2018-07-25
Filing date: 2018-11-01
Publication date: 2020-01-30
Also published as: CN109094746B; CN109094746A

Abstract

A buoyancy tower platform, comprising a suction pile (1) and a first-stage tower body (2), wherein the first-stage tower body (2) comprises at least one column, the suction pile (1) is arranged at the bottom of the first-stage tower body (2); and further comprising a second-stage tower body (3), wherein a column of the second-stage tower body (3) corresponds to the column of the first-stage tower body (2), the centre at the top of the column of the first-stage tower body (2) is provided with a recessed groove, the cross-sectional specification of the recessed groove is matched with the cross-sectional specification of the column of the second-stage tower body (3), the lower part of the column of the second-stage tower body (3) is correspondingly embedded in the recessed groove in the column of the first-stage tower body (2), and the upper part of the second-stage tower body (3) is provided with a superstructure (4). The buoyancy tower platform is applicable to operating in sea areas with different water depths.

Description

Buoyancy tower platform and installation method of the platform

Technical field

The invention relates to a buoyancy tower platform and a method for adjusting water depth by the platform, and belongs to the field of marine engineering.

Background technique

The buoyancy tower platform is a platform that is also used to collect and store condensate or crude oil. The shape of the buoyancy tower platform is similar to the SPAR platform, but the difference is that the buoyancy tower platform cabin structure extends all the way to the sea floor and passes its own shallow The basic cylindrical suction pile fixes it on the sea floor and moves with the waves. A big advantage of the buoyancy tower platform is that it can be self-installed, no auxiliary and transportation and installation equipment is needed, and it is easy to install and disassemble, and it can be used in transition However, at present, the buoyancy tower platform is a platform with a fixed total height, such as the platforms covered by patents 2011800612002 and 2013104737690. These platforms are not suitable for water depth adjustment. Re-application requires the water depth to remain basically the same, and the application range is greatly restricted. If similar jack-up equipment is used to adjust the applicable water depth, this will make the platform cost a leap and change the original intention of the buoyancy tower platform to be cheap.

Summary of the Invention

The technical problem to be solved by the invention is to solve the disadvantage that the existing buoyancy tower platform can only adapt to a single water depth.

In order to solve the above problem, the buoyancy tower platform of the present invention includes a suction pile and a first-stage tower body. The first-stage tower body includes at least one column. The suction pile is disposed at the bottom of the first-stage tower body. Including a second-stage tower, the pillars of the second-stage tower correspond to the pillars of the first-stage tower, and the center of the top of the pillars of the first-stage tower is provided with a depression groove, and the depression groove The cross-section specifications match the cross-section of the column of the second-stage tower. The lower part of the column of the second-stage tower corresponds to the recessed groove embedded in the column of the first-stage tower. The upper part is provided with a superstructure.

The above technical solution is further optimized. The suction tower is a single cylinder or a multi-cylinder, and the multi-cylinder is at least two single-cylinders of the same specification arranged in parallel and the upper and lower ends are on the same horizontal plane.

The above technical solution is further optimized. The second-level tower body is split, and the applicable water depth can be changed by replacing the second-level tower body with a different height.

The above technical solution is further optimized, and the height of the second-stage tower does not exceed 5 times the depth of the recessed groove.

The buoyancy tower platform installation method described in the above solution includes the steps of launching the first-stage tower body, injecting the first-stage tower body, sinking the first-stage tower body, and ensuring that the top of the first-stage tower body is on the surface of the seawater. Above, move the first-level tower body close to the semi-submersible ship, place the first-level tower body directly below the second-level tower body of the outboard bracket on the semi-submersible ship, drain the first-level tower body, and make the first The first-level tower body floats up, the recessed groove on the first-level tower body is inserted into the second-level tower body, and then the buoyancy tower is filled with water, so that the upper end of the second-level tower body reaches the height of the installed superstructure, and the upper end of the second-level tower body Installation of superstructure.

In the above scheme, the height of the second-level tower can be selected according to the depth of the construction area.

The reverse process of the above installation method is the platform disassembly method.

Compared with the existing buoyancy tower platform, the buoyancy tower platform of the present invention can adapt to operations in different water depths and sea areas.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a buoyancy tower platform according to the present invention;

FIG. 2 is a comparison diagram of the existing buoyancy tower platform and the buoyancy tower platform of the present invention using second-level tower bodies of different specifications; FIG.

3 to 12 are schematic diagrams of a buoyancy tower platform installation process according to the present invention.

detailed description

The following describes embodiments of the buoyancy tower platform of the present invention with reference to FIGS. 1 and 2:

Existing buoyancy towers are composed of single or multiple cylinders, typically four-post buoyancy tower platforms. The cylindrical structure of the buoyancy tower tower is higher than the free surface, which is the sea level5. Fixed total height platform, the applicable water depth cannot be adjusted, which limits the scope of re-application in transition.

As shown in FIG. 1, the buoyancy tower platform includes a suction pile 1 and a first-stage tower body 2. The suction pile 1 is disposed at the bottom of the first-stage tower body 2, and the first-stage tower body has a four-column structure. The four cylinders are formed by four cylinders of the same specification arranged in parallel to ensure that the end faces of the four cylinders are at the same horizontal plane.

It also includes a second-level tower body 3, which is also a four-cylinder structure. The four-cylinder body is also formed by four cylinders of the same specification in parallel, and ensure that the end faces of the four cylinders are on the same horizontal plane.

The top center of the four cylinders of the first-stage tower body 2 is provided with a recessed groove, and the cross-sectional specifications of the recessed grooves match the cross-section of the cylinder body of the second-stage tower body 3. The lower part of each of the cylinders is correspondingly embedded in a recessed groove on the four cylinders of the first-stage tower 2, and the upper part of the second-stage tower 3 is provided with a superstructure 4.

As shown in Figure 2, by replacing the second-level tower body 3 with a different height, the applicable water depth can be adjusted, and no expensive jacking system is needed. This is positive for the re-application of the buoyancy tower platform in the marginal oilfield sea area. Meaning.

See Figure 3 to Figure 12 for the installation method of the buoyancy tower platform:

a. The buoyancy tower and its superstructure 4 are transported by semi-submersible vessels, where the first-level tower body 2 lies horizontally on the semi-submersible deck, and the second-level tower body 3 and the superstructure 4 are placed on a bracket 6 in turn. , And can slide on the bracket 6, the section of the bracket 6 extends to the outside of the ship's side;

b. The semi-submersible dives, the first-level tower 2 floats, and the tug pulls the first-level tower 2 away from the semi-submersible;

c. Fill the bottom of the first-stage tower 2 with water to sink the first-stage tower 2 and pay attention to ensure that the top of the first-stage tower 2 is above the free surface 5;

d. Push the first-level tower body 2 closer to the semi-submersible ship and place it on the semi-submersible ship to extend under the bracket 6 on the outside of the ship's side;

e. Slide the second-stage tower 3 on the bracket 6 directly above the first-stage tower 2;

f. The first stage tower 2 is drained and floated, at this time the first stage tower 2 is docked with the second stage tower 3, and the second stage tower 3 is embedded in the first stage tower 2 and riveted to fix;

g. Fill the first-stage tower 2 with water again, at this time, the first-stage tower 2 sinks, pay attention to ensure that the top of the second-stage tower 3 is above the free surface 5;

h. Slide the superstructure 4 on the bracket 6 directly above the second-level tower body 3;

i. The first-level tower body 2 is drained and floated, and the second-level tower body 3 is docked with the superstructure 4 at this time, and is riveted and fixed;

j. Drag the entire buoyancy tower to the target water area for installation.

The dismantling process of the buoyancy tower is the reverse process of the above-mentioned installation process, and the transition and re-installation can be conveniently implemented by the above method.

The limit length of the second-stage tower 3 depends on the structural strength and the depth of the second-stage tower 3 embedded in the first-stage tower 2. It is generally recommended that the total length of the second-stage tower 3 does not exceed 5 times the embedded length. .

Claims

The buoyancy tower platform includes a suction pile and a first-stage tower body. The first-stage tower body includes at least one column. The suction pile is disposed at the bottom of the first-stage tower body and is characterized in that it further includes a second-stage tower. The tower body, the pillars of the second-stage tower body correspond to the pillars of the first-stage tower body, and the center of the top of the pillar of the first-stage tower body is provided with a recessed groove, and the cross-sectional specifications of the recessed groove The cross-sections of the columns of the second-level tower are matched. The lower portion of the second-level tower is corresponding to the recessed groove embedded in the first-level tower. The upper part of the second-level tower is provided with Superstructure.
The buoyancy tower platform according to claim 1, further characterized in that the suction tower is a single cylinder or a multi-cylinder, and the multi-cylinder is at least two single-cylinders of the same specification arranged in parallel and the upper and lower ends are the same. level.
The buoyancy tower platform according to claim 1 or 2, further characterized in that the second-stage tower body is split.
The buoyancy tower platform according to claim 3, further characterized in that the height of the second-stage tower body does not exceed 5 times the depth of the recessed groove.
The method for installing a buoyancy tower platform according to any one of claims 1 to 4, further comprising the steps of: launching the first-stage tower body, injecting the first-stage tower body with water, and lowering the first-stage tower body. Sink, make sure that the top of the first-stage tower is above the surface of the seawater, move the first-stage tower close to the semi-submersible, and place the first-stage tower on the right of the second-stage tower of the outboard bracket on the semi-submersible Below, drain the first-level tower body to make the first-level tower body float, insert the recessed groove on the first-level tower body and the second-level tower body, and then fill the buoyancy tower with water to make the upper end of the second-level tower body reach Install the superstructure height, and install the superstructure on the upper end of the second-level tower.
The method for installing a buoyancy tower platform according to claim 5, wherein the height of the second-stage tower body is selected according to the depth of the construction sea area.