SU1731901A1 - Ice-protection device for offshore platform - Google Patents

Abstract

The invention relates to the operation of hydraulic oil and gas facilities. The purpose of the invention is to increase the efficiency and reliability of the device in severe ice conditions. The annular float 5 is located below the surface of the water. By means of rigid elements 6, it is connected to a hinge 7 installed in the bottom part of the supporting column 2 with the possibility of inclined rotational movement and an emphasis of the structure on the base 1 of the platform under the influence of moving ice. 3 il.

Description

The invention relates to the field of operation of hydraulic oil and gas field facilities.

The purpose of the invention is to increase the efficiency and reliability of the device in severe ice conditions.

FIG. 1 shows schematically the device, a general view; figure 2 - the device interacting with the ice field; on fig.Z-device interacting with an iceberg:

The offshore platform consists of a base 1 fixed to the seabed and supported on the supporting column 2 of the working platform 3 with technical equipment 4. Around the supporting column 2 there is an annular float 5 attached by rigid hollow elements 6 to the universal joint 7 installed on the bottom . Availability universal

the hinge 7 allows the entire structure, under the influence of ice, not only to tilt, but also to rotate. To accelerate the rotation process, propellers 8 can be used. On the outer surface of the float 5 there are ice-breaking inclined surfaces 9 and 10 directly in contact with the ice field 11. The device is also equipped with elements 12, which impart greater rigidity to the entire structure as a whole.

The device works as follows.

When drifting ice appears in accordance with the direction of ice movement, the annular float 5 below the surface of the water begins to rise up one of its sides to make contact with the ice field 11. The initial inclination of the float takes place

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is a known method: either by injecting water into the float 5, or by means of a driven load and due to the presence of a universal joint 7. Breaking of ice occurs due to the impact of the body of the float 5 on the surface of the ice field 11 with its ice-breaking surfaces 9 and 10. Ice can be destroyed by bending both up and down to the required width. At the same time, the force of the ice effect on the float 5 is such that an even greater inclination of the latter occurs, while the horizontal component of the ice effect is transmitted through the universal joint 7 to the base 1 of the platform, without the load on the supporting column 2. And the vertical components of the ice load the float 5 is flooded when its surface 9 interacts with ice and tends to lift it out of the water when it is in contact with ice by the surface 10. Thus, the buoyancy force is used to increase the efficiency of no ice.

When interacting with heavy ice formations, such as an iceberg, which are difficult to technically and economically impractical to destroy, the structure first works as a damping device that converts the kinetic energy of the moving iceberg into the potential energy of the flooded volume of the ring float 5 and elements b. In this case, the float 5, under the action of ice, will begin to slope gsi and assume such a situation when one edge of it is pressed against the base 1, with the universal joint 7 serving as the second attachment point. The protective ring float 5, together with the rigid elements 6 and the outer ring of the universal joint 7, form a frame in the form of a truncated cone, which can roll along the base 1 of its generator.

The entire truncated cone-iceberg system is in an unstable position and upon further interaction a component appears, rolling the cone over the base 1, while the float 5 will roll along the iceberg, as a result of which it will be retracted from the structure and continue its drift. Contact with an iceberg can be cleared faster by using propellers 8 before and during interaction with it.

Thus, the location of the device below the water surface, the installation of a universal joint in the lower part of the supporting column and the presence of rigid elements will significantly improve the efficiency and reliability of the device when protecting against heavy moving ice such as toros, icebergs. Invention Formula

A device for protecting the offshore platform from moving ice, including an annular float with ice-breaking surfaces, connected by means of a spatial hinge to a supporting column with the possibility of oblique-rotational movement, in order to increase the efficiency and reliability of the device operation in heavy ice conditions, it is provided with rigid elements, an annular float is made submerged and connected to a spatial hinge located in the lower part of the support shaft by means of rigid elements At the same time, the ice-breaking surfaces are formed by the beveled edges of the float, and the outer diameter of the float along the ice-breaking surfaces is larger than the depth of the water area at the installation site.

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Claims (1)

Claim A device for protecting the offshore platform from moving ice, including an annular float with ice surfaces, connected by a spatial hinge with a support column with the possibility of oblique-rotational movement, characterized in that, in order to increase the efficiency and reliability of the device in severe ice conditions, it equipped with rigid elements, the annular float is made flooded and by means of rigid elements connected to a spatial hinge located in the lower part of the support column s, wherein ledolomnye surface formed by beveled edges of the float, and the outer diameter of the float ledolomnym surfaces made larger than the depth of the waters at the place of installation. ου /