CN201151470Y

CN201151470Y - Semisubmersible drilling platform

Info

Publication number: CN201151470Y
Application number: CNU2008200785577U
Authority: CN
Inventors: 曾恒一; 谢彬; 林瑶生; 粟京; 李小平; 沈志平; 冯玮; 张海彬
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Research Center
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Research Institute Co Ltd
Priority date: 2008-01-15
Filing date: 2008-01-15
Publication date: 2008-11-19
Anticipated expiration: 2018-01-15

Abstract

The utility model discloses a semi-submersible drilling platform. The semi-submersible drilling platform provided by the utility model comprises two floating boxes, at least two columns are supported on each floating box, and a deck is supported on the column, wherein, the middle of the two floating boxes is connected with at least two wide-wing horizontal blanking level braces, and the junction of the horizontal blanking level brace and the floating box is positioned just below the column on the floating box. The two wide-wing horizontal blanking level braces are arranged between the floating boxes of the semi-submersible drilling platform of the utility model and just below the column so as to be connected with the floating boxes, and the junction of the horizontal blanking level brace and the floating box is positioned just below the column on the floating box, thus increasing the displacement weight of the platform, increasing the strength and the anti-wave ability of the platform, and ensuring that the platform can still be in work under a medium or even wicked ocean condition; secondly, the inner part of the wide-wing horizontal blanking level brace is separated into at least two watertight compartments, therefore, even when a lateral cabin is damaged, undamaged structures can still main sufficient carrying capacities.

Description

Semi-submersible drilling unit

Technical field

The utility model relates to a kind of marine semi-submersible drilling unit.

Background technology

Along with marine petroleum development constantly marches to deep water sea area, traditional fixed platform can't be competent at job requirements, and floating platform will become the main tool of following deep water hydrocarbon field exploratory development.Semi-submersible drilling unit is the class important member in the floating platform, as the disclosed semi-submersible drilling unit of WO9957011A1, shown in Figure 1A, by two buoyancy tanks 12,14 for it provides buoyancy, and each buoyancy tank supports two

vertical columns

20,22,24,26, topside four column apical support, between two root posts with a

tubulose stull

38,40 connect, to improve flat-bed intensity.But the intensity of these tubulose stulls is limited, will injure whole flat-bed safety in case suffer to destroy, thereby having relatively high expectations to deck intensity.The disclosed another kind of semi-submersible drilling unit of US6378450B1 is shown in Figure 1B, its structure is similar to Figure 1A, maximum difference is the tubulose stull quantity between the column is increased to 2, can improve redundancy like this when increasing the flat-bed bulk strength.

The utility model content

The purpose of this utility model provides a kind of can be used for medium and the semi-submersible drilling unit severe sea condition condition.

Semi-submersible drilling unit provided by the utility model, comprise two buoyancy tanks, all support at least two root posts on each buoyancy tank, described column upper support has the deck, wherein, be connected with the horizontal brace of at least two wide width wing types between described buoyancy tank, the junction of described horizontal brace and buoyancy tank be positioned at described the above column of buoyancy tank under.

Wherein, the cross-sectional plane of horizontal brace is the polygon of width greater than height, and its cross-sectional width is suitable with the column width.In order to improve redundancy, stull separates with axial bulkhead and is at least 2 watertight cabins.For reducing holder boat resistance, the cross-sectional profiles line outside chamfering or the cavetto of stull.

Environmental resitance when reducing positioning action, the cross-sectional plane of column are square, four jiaos of cavettos.Same, in order to reduce resistance, the bow of buoyancy tank and stern outer wall shrink and the top cavetto gradually with certain angle.

The utility model between the buoyancy tank of semi-submersible drilling unit, the horizontal brace of two wide width wing types is set under the column buoyancy tank is connected.Compare with the tubulose stull, the structural strength of wide width wing type stull own is bigger, has the ability of good opposing horizontal separation power and vertical moment of torsion, can improve the flat-bed bulk strength; The stull of wide width wing type has bigger displacement, can improve flat-bed workload ability; Wide width wing type stull in the vertical direction has bigger cross-sectional plane, can improve the flat-bed exercise performance, thereby improves the ability of platform Chinese People's Anti-Japanese Military and Political College stormy waves, and platform also can be worked under medium even abominable sea conditions; Wide width wing type stull inside is divided at least two watertight cabins, even when outboard cabin is damaged, damaged structure still can not keep enough load-carrying capacitys.

Description of drawings

Fig. 1 is the disclosed semi-submersible drilling unit structural representation of WO9957011A1 and US6378450B1;

Fig. 2 is the semi-submersible drilling unit structural representation;

Fig. 3 is the front view of semi-submersible drilling unit;

Fig. 4 is the cross sectional drawing of horizontal brace;

Fig. 5 is a flat-bed stern view;

Fig. 6 is the arrangement plan of main deck;

Fig. 7 is the horizontal cross of column;

Fig. 8 is the buoyancy tank arrangement plan.

The specific embodiment

As Fig. 2 and shown in Figure 8, the utility model semi-submersible drilling unit 10 is made of 20,22,24,26, two wide width wing type

horizontal braces

38,40 of 12,14,4 columns of 2 buoyancy tanks and box deck 30.

Column

20,22,24,26 is used for supporting equipment box decks 30 such as placing the drilling well facility, and

column

20,22,24,26 stands on respectively on 2 buoyancy tanks 12,14.Between buoyancy tank 12,14, a wide width wing type of configuration horizontal brace 38 under the

column

20,24, between buoyancy tank 12,14, another wide width wing type horizontal brace 40 of configuration under the column 22,26.Buoyancy tank 12,14 horizontal positioned and being parallel to each other, each buoyancy tank supports two root posts; Buoyancy tank 12,14 is connected by two wide width wing types

horizontal brace

38,40, and the junction of

horizontal brace

38,40 and buoyancy tank 12,14 is positioned at the buoyancy tank inboard under the column.Box deck 30 can be placed various device by 20,22,24,26 supports of four root posts on the box deck as required, as drill outfit (as derrick, drilling riser pipe etc.), marine equipment, electrical generator etc., and configuration life building and helicopter deck etc.Be understandable that, on buoyancy tank 12 at column 20, can support a root post again between 22, cooresponding, between

column

24,26, also supporting a root post on the buoyancy tank 14, under this two root post and buoyancy tank junction, be connected the horizontal brace of a wide width wing type again, can further improve the intensity of the utility model semi-submersible drilling unit like this, improve the ability of platform Chinese People's Anti-Japanese Military and Political College stormy waves.

The described semi-submersible drilling unit 10 of the utility model adopts box deck 30 (Fig. 5), and drill outfit, marine equipment, electrical generator etc. are placed by upright supports in the deck on it, and promenade deck 66 (Fig. 6) disposes life building and helicopter deck.Drilling riser pipe 84,86 (Fig. 6) is divided into two groups, wherein is positioned in a horizontal manner for one group 84 on the main deck, and another group 86 is placed on the riser jacket in vertical mode, so that transfer to rig floor 88 (Fig. 5) comparatively easily in operation.

Two

stulls

38,40 are arranged at respectively between the buoyancy tank 12,14, compare with the tubulose stull, the structural strength of wide width wing type stull own is bigger, ability with good opposing horizontal separation power and vertical moment of torsion, can reduce the stress level of column and topside connecting portion to a great extent, thereby guarantee platform and integrally intensity and improve fatigue property; The stull of wide width wing type has bigger displacement, can improve flat-bed workload ability; Shown in Fig. 4 A-Fig. 4 C, two stulls [38,40] cross-sectional plane is polygon or oblong, the stull cross-sectional plane can be about horizontal midship section or vertical midship section symmetry, also can be asymmetric, its width is suitable with the column width, in the vertical direction can provide bigger cross-sectional area to increase the resistance on the platform vertical direction, help improving the exercise performance of platform in the vertical direction, thereby improve the ability of platform Chinese People's Anti-Japanese Military and Political College stormy waves, platform also can be worked under medium even abominable sea conditions; Two

stulls

38,40 possess redundant ability, be divided at least 2

watertight cabins

44,46 by axial bulkhead 42 respectively, inboard cabin 44 is used for place apparatus and as passage, outboard cabin 46 can be used as ballast tank, even when outboard cabin 46 was impaired, inboard cabin 44 still can keep the load-carrying capacity of stull self; Stull 38,40 cross-sectional profiles lines outside chamfering or cavetto are to reduce towage resistance.

Buoyancy tank 12,14 cross-sectional planes are rectangle, its bottom cavetto 16 (Fig. 3), buoyancy tank 12,14 bows and stern

outer wall

50,54 shrink gradually with certain angle, its

top

52,56 cavettos (Fig. 2), can reduce holder boat resistance, buoyancy tank 12,14 inside are carried out subdivision and are used to place ballast, drill fluid and other necessary facilities.8 propelling units 62 (Fig. 3) that are used for dynamic positioning of buoyancy tank 12,14 belows configuration.Column cross-section is a square (Fig. 7), and the environmental resitance of four jiaos of cavettos of cross-sectional plane when reducing positioning action, and inside is carried out subdivision and is used to place mud, ballast and anchoring equipment etc.The platform working condition is divided into operating draft 32 and survival draft 34 (Fig. 3).

Claims

1, a kind of semi-submersible drilling unit, comprise two buoyancy tanks, all support at least two root posts on each buoyancy tank, described column upper support has the deck, it is characterized in that: be connected with the horizontal brace of at least two wide width wing types between described buoyancy tank, the junction of described horizontal brace and buoyancy tank be positioned at described the above column of buoyancy tank under.

2, semi-submersible drilling unit according to claim 1 is characterized in that: the cross-sectional plane of described horizontal brace is polygon or the oblong of width greater than height.

3, semi-submersible drilling unit according to claim 2 is characterized in that: the width of the cross-sectional plane of described horizontal brace is suitable with the width of described column.

4, semi-submersible drilling unit according to claim 2 is characterized in that: the cross-sectional profiles line outside chamfering or the cavetto of described horizontal brace.

5, semi-submersible drilling unit according to claim 2 is characterized in that: described horizontal brace separates with axial bulkhead and is at least 2 watertight cabins.

6, according to the arbitrary described semi-submersible drilling unit of claim 1-5, it is characterized in that: the cross-sectional plane of described column is square, four jiaos of cavettos.

7, according to the arbitrary described semi-submersible drilling unit of claim 1-5, it is characterized in that: described buoyancy tank cross-sectional plane is a rectangle, four jiaos of cavettos.

8, semi-submersible drilling unit according to claim 7 is characterized in that: the bow of described buoyancy tank and stern outer wall shrink and the top cavetto gradually with certain angle.