Shallow submerged ice platform

 

(57) Abstract:

Shallow submerged ice platform designed for operation in Arctic waters. The inventive within the platform sloping sides of its base above the water line is made into a domed shape to the upper deck and below the water line is made moveable in the plane of the non approaching to the bottom of the water area. This form of flanges prevents the concentration of large masses of ice on the upper deck substructure. 3 Il.

The invention relates to the development of the continental shelf, namely the artificial Islands, and with the greatest effect can be applied for operation in the Arctic latitudes.

The main problem of the use of the exploration and exploitation of offshore drilling platforms in the Northern latitudes is the continuity of its work in terms of contact with the ice field. The design of the platform must be able to effectively withstand the pressure of moving ice field.

Known operational offshore platform for polar latitudes (U.S. patent N 4260292, CL 405-217 from 1981), containing pricopoaea barge, upper deck which vozvyshaev is the possibility of heating of the walls mentioned pyramidal body.

The upper structure supported by columns on the deck of the barge, placed above the moving ice, and its dimensions do not exceed the dimensions of the barge.

For all the good qualities such shallow platform it is not devoid of drawbacks, the main of which is ineffective opposition to the pressure of the ice field. Sloping walls of the pyramidal housing facilitate the cracking of the ice, but his arm crawl against the deck of the barge. While the hummocking reaches a height of up to 8 ice thickness. It is easy to see that the accumulated layer of ice continues to move, reaches the supports of the upper structure and can destroy them.

Another important disadvantage is unreasonably high total mass of the platform due to the full upper surface of the housing. In this case posted by the engineering and technological equipment, residential and office space. All this affects the weight characteristics and, ultimately, affects the increase in precipitation. As a consequence, the platform cannot be used in shallow water (at depths of 3 to 10 m). There is a construction based on the bottom of the caisson for use in Arctic conditions (U.S. Patent N 4479742, CL 405-217 from 1984 - prototype). The caisson viarouge and contributes to the destruction of the impending ice fields.

Although this design is clearly improves performance (improving the ability of the opposition to the movement of the ice field by its destruction), but nevertheless it is obvious that this wall can not be infinitely high enough to eliminate the concentration of ice hummocks on the deck of the caisson. It is theoretically possible, but to ensure the strength characteristics in such wall, you need to invest so much scarce metal that exceeds reasonable limits.

The present invention is to prevent a dangerous concentration of large masses of ice on the upper deck substructure shallow submerged ice platform by forming referred to the upper deck.

The problem is solved in the shallow submerged ice platform containing the submersible to the bottom of the water area of the supporting base with inclined to the horizontal flanges on the upper deck hosts the surface of the structure, and the side above the water line is made into a domed shape to the upper deck and below the water line into the plane, asymptotically approaching the bottom.

The proposed solution preditah">

The ice platform, as it is represented in the drawing, includes upper structure 1 (drilling complex) and the support base 2, consisting of an upper deck 3 - its surface part and soles 4 - the underwater part. Upper deck 3 above the level of the ice field, in the longitudinal and transverse directions made dome 6, near water edge which merges into the plane 7. The platform is installed on the bottom 8 of the water. In addition to the drilling complex features a tower design 9 for home (office) premises and helipad.

To perform drilling operations in shallow water submersible ice platform in a floating state is transported to the place of registration. Known means, on the point of setting the platform ballustrade and its base is lowered to the bottom 8. This is partially plane 7 are above the water, and partially submerged in water and asymptotically approaching the bottom 8. This is done for the next goal. Ice fields in the Arctic reaches a thickness of up to 2 m of Course, most of the 5 ice is under water. In shallow water (platform, in particular, is designed for depths up to 10 m) as the ice moves 5 its underwater part, meeting with non approaching the bottom of the PLO is valuutta backwards, and sideways, nagromozhdenie each other, forming hummocks up to 8 ice thickness height. Reaching a certain weight and height, the ice begins to slide with a domed surface 6. Upper deck 3 has mentioned domed pogib 6, both longitudinal and transverse (Fig. 3) directions. Therefore overlapped blocks of ice falling on the dome deck, under its own weight roll overboard and thus, for the most part do not reach drilling facility and tower 9. A small mass of ice, reaching this complex cannot any serious threat to its integrity.

Thus, the proposed formation of the upper deck 3 allows to increase the effective confrontation of the platform moving ice field. This result contributes to the fact that steel structures 1 and 9, located above the level of the ice, are the minimum required sizes. This allows the lowest cost to ensure their strength properties. While most technological equipment transferred to the supporting base 2 and is almost not affected by ice.

Shallow submerged ice platform, containing the supporting base with a sloped the e side above the water line is made into a domed shape to the upper deck, and below the water line extend in a plane non approaching to the bottom.

 

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