JPS5820327B2 - Ice drilling platform - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil drilling platform to be installed in an icy area, and more specifically, to an oil drilling platform installed in a water ocean where the movement of fast ice or drift ice during an oil drilling period is on the order of several to several Iom. Regarding oil drilling workbench suitable for.

For example, in fast ice areas such as the Arctic Ocean, the movement of fast ice is small (up to about 20 m during winter).

Conventionally, when drilling for oil in areas with fast ice and shallow water depth (approximately 20 m or less), sand,
An artificial island is constructed using gravel or a basin of water, and oil drilling equipment is installed on this artificial island.

However, in this case, all oil drilling equipment and materials would have to be transported from land after the artificial island is constructed.

(b) It will take one to two months to construct an artificial island.

←J Applicable only to shallow waters.

2) The structure must be designed to withstand running water and hydraulic forces.

(Residence) If an artificial island is constructed using sand or gravel, it is difficult to remove it after excavation is completed, and there is a problem of environmental pollution.

(f) When an artificial island is constructed using a water basin, the period during which excavation is possible is limited to one to two months during the winter season.

There are many problems that need to be solved.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide an oil drilling workbench for ice seas, which enables oil drilling to be carried out safely and economically in winter and summer, regardless of the water depth, in fast ice sea areas.

Examples will be described below with reference to the drawings.

FIGS. 1 and 2 show an oil drilling platform (first embodiment) suitable for deep icy areas.

In the figure, one end of a floating square platform 1 is wrapped around a winch 2 fixed on its upper surface.
It is moored to the seabed A by a wire (or chain) 4 with an anchor 3 attached to the other end.

Tower 5 and other excavation equipment (
(not shown) is installed, and a vibro for drilling is inserted into the seabed A from this device.

A space is provided around the four peripheries of the platform 1 in the direction of the sea surface, and a floating frame 7° 8. Floating anti-icing frame 10
are arranged surrounding the platform 1, and this anti-icing frame 10 is also equipped with a wire (or chain) 11 and an anchor 1.
2, it is moored to seabed A.

Plan ``The space between the form 1 and the anti-icing frame 10 is covered with sheets made of cushioning material or flexible material such as cloth or rubber in a double layer 13 and 14, and the sea level in this space is and air to be shielded or insulated.

If necessary, a heating device (not shown) for supplying warm air or hot air to the interior of the double seas N3, 14 is provided.

The method of constructing the above-mentioned oil drilling platform for ice-cold waters is to load the oil drilling equipment onto platform 1 at another dock or other location,
This is towed to its destination, an icy area, and moored with a wire 4.

Similarly, the separately constructed separate frames 5 and 6 are transported by tow or ship, and at the destination, they are connected around the platform 1 with joints 9 to form an anti-icing frame 10.
is constructed and moored with wire 11.

Next, in the space between the platform 1 and the anti-icing frame 10,
Two layers of upper and lower seeds 13 and 14 are stretched to cover the space.

The best time to construct is in the summer when the ice is melting, but depending on the size of the equipment itself, the thickness of the ice in the target area, and other conditions, it may not be possible to construct the equipment even in the winter when there is ice by crushing the ice as appropriate. It is possible.

The operation or function of the device is as follows: First, the upper and lower double flexible sheets 13 and 14 are used to shield the sea surface from the air, or to provide insulation between the platform 1 and the anti-icing frame 10.
The key is to not let ice build up even in the winter.

In this case, if necessary, warm air or hot air can be supplied to the inside of the double flexible seams H3 and 14 using a heating device.
Ice formation can be completely prevented.

Second, when the excavation work is carried out in the winter and there is fast ice or drift ice B around, the movement of the fast ice or drift ice in the direction along the sea surface causes this hydraulic force to be applied to the side surface of the outer periphery of the anti-icing frame 10. This hydraulic force is absorbed by the flexible sheet 13.14 due to its deflection and the fact that ice does not form on the sheet 13.14 as described above, and therefore the influence of the hydraulic force is reduced to the platform. This is not even close to 1.

Therefore, no bending force is applied to the equipment installed on the platform 1, especially the excavation pipe 6, and the excavation work can be carried out safely without damaging the vibro or the like.

Note that the water pressure p applied from the sea surface is received by the lower sheet 14.

In this case, the size of the space between the platform 1 and the anti-icing frame 10, the degree of flexibility and amount of deflection of the seams N3 and 14, etc. will depend on the oil drilling period (usually 2 to 3 months) and the amount of ice formed during that period. displacement (e.g. in Arctic waters - up to 20 m during winter)
That's about it.

), etc.

If the direction and amount of ice movement are known in advance,
Each time the platform 1 moves from one end to the opposite end in the movement direction with respect to the anti-icing frame 10 (this can be considered).

The second embodiment will be described with reference to FIG. 3. Between the platform 1 and the anti-icing frame 10, double-layered bellows members 15 and 16, which are vertically expandable and contractible, are stretched.

The bellows material is preferably made of cloth or rubber, but the material is not particularly limited, and may be made of a steel plate or the like with a stretchable bellows-like structure.

For the rest of the configuration, the configuration of the first embodiment described above can be applied as is, and the construction method of the entire device and the function and function of the bellows member are also almost the same.

FIG. 4 shows a work platform (third embodiment) installed in an icy area with shallow water depth, in which the height of the platform 17 is set according to the water depth, and a skirt or protrusion 18 is provided at the bottom of the platform 17.
This skirt 18 is inserted into the seabed A, and the platform 17 is brought to the bottom and fixed.

On the other hand, the floating anti-icing frame 19 is floated on the sea surface, and the wire 20
mooring.

As the flexible member, the flexible seams N3 and 14 or the bellows members 15 and 16 described in the front box 1 and the second embodiment are applied.

Other configurations, construction methods, functions, and functions are also almost the same.

FIG. 5 shows a fourth embodiment, in which the platform 21 is made circular, and the floating anti-icing frame 22 is also formed into an annular shape, for example, by connecting four semicircular frame bodies 23 divided into four parts by a joint 24, Spread the upper and lower seams (25.26) or bellows material in the space between the two.

The platform 21 may be of a moored type or a fixed type.

The fifth embodiment will be described with reference to FIGS. 6 and 7. A plurality of sealed air bags 27 to 34 degrees 27' to 34' are spread on the sea surface between the platform 1 and the anti-icing frame 10.

Each air bag suspends weights 39 to 42 that balance its buoyancy, and is fitted with a valve 43 that adjusts the internal nitrogen pressure or opens when the internal pressure exceeds a certain value to release the air inside.

In the initial state of installation of the device, the air bag applies an appropriate internal pressure 1 to cause a certain deformation or deflection in the direction along the sea surface between the outer surface of the plant form 1 and the inner surface a of the anti-icing frame 10. I'll keep it.

The function of this air bag is to prevent ice from forming in the space between the platform 1 and the anti-icing frame 10, and to prevent ice from forming in the space between the platform 1 and the anti-icing frame 10, and to prevent ice from forming on the upstream side of the platform 1 in the direction of ice movement when the surrounding ice moves in a certain direction. The air bag (for example 27-30) is the anti-icing frame 1
0 and the internal pressure exceeds a certain value, the valve 43 opens and releases the internal air, the air bag itself contracts, and the anti-icing frame 10 is moved by the amount of ice movement. The amount is absorbed by the air bag, eliminating the influence on the platform 1.

At this time, the air bladders (27' to 3σ) on the downstream side of the platform 1 in the direction of ice movement expand toward the sea surface to cover the increased area of the sea surface due to the movement of the anti-icing frame 10.

In the fifth embodiment, the platform 1 is moored by the wire 4 when the water depth is deep, but in the sixth embodiment shown in FIG. This figure shows a case in which the platform 17 is brought to the bottom by means of a skirt 18 in a shallow icy sea area.

In addition, the seventh embodiment shown in FIG. 9 shows a case where the platform and anti-icing frame are circular, for example, four semicircular shapes, whereas the platform and anti-icing frame are square in the fifth and sixth embodiments. The air bags 45 to 47 are laid out as shown in the figure.

According to the above-described oil drilling platform for ice-cold seas of the present invention, the following effects can be obtained.

In other words, ■ The space between the platform on which oil drilling equipment is mounted and the floating ice protection frame surrounding it is covered by a flexible member that shields or insulates the sea surface and air in that space, and By preventing ice from building up and absorbing the movement of surrounding ice using flexible members, hydraulic power is prevented from affecting the platform and oil drilling equipment, especially drilling pipes, thereby preventing breakage or damage to pipes and other drilling equipment. It is safe.

■ Oil drilling equipment can be mounted on a separate platform and towed to the destination, moored or brought to the bottom at the site, and the anti-icing frame and flexible members installed on site, making it possible to construct the entire equipment on site. Installation is extremely easy and the construction period is extremely short.

■ Dismantling the equipment can be done extremely easily and in a short period of time, and after dismantling, the same equipment can be moved to another destination and used in the same way, and the total number of equipment can be small. Moreover, there is no problem of environmental pollution at the site during installation or especially after demolition.

■ Equipment installation, oil drilling, and demolition work can be carried out regardless of the presence or absence of ice, allowing continuous work to be carried out throughout the winter and summer.

■ Installation, excavation and demolition work can be carried out regardless of the water depth.

■ Overall, it is highly safe and inexpensive, not affected by seasons or water depth.

[Brief explanation of drawings]

The figures show an embodiment of the oil drilling workbench for ice-covered seas according to the present invention. Fig. 1 is an overall plan view of the first embodiment, Fig. 2 is an overall longitudinal sectional front view taken along the line ■-■ in Fig. 1, and Fig. 3 is a partially enlarged longitudinal sectional front view showing the flexible member according to the second embodiment, FIG. 4 is an overall longitudinal sectional front view of the third embodiment, FIG. 5 is an overall plan view of the fourth embodiment, and FIG. 5 is an overall plan view of the fifth embodiment, FIG. 7 is an overall longitudinal sectional front view taken along line ■-■ in FIG. 6, FIG. 8 is an overall longitudinal sectional front view of the sixth embodiment, and FIG. 9 is an overall longitudinal sectional front view of the seventh embodiment. FIG. Li2,21...Platform, 4, 11゜2
0... wire or chain, 5... tower, 6...
・Pipe, 10, 19, 22... Anti-icing frame, 13, 14
゜'25.26... Sheet, 15.16... Bellows part material, 27-42, 27'-42', 44-47...
Air bladder, 43... Valve, A... Seabed, B... Ice.

Claims (1)

[Claims] 1. Oil drilling for ice-cold seas, in which a platform equipped with oil drilling equipment is surrounded by a floating anti-icing frame with a space interposed all around it in the sea direction, and the space is covered with a flexible member that shields the air in the space from the sea surface. Workbench.