SU1124095A1 - Deep-water drilling base - Google Patents

Abstract

A deep-water foundation for drilling, including a working platform of a polygonal shape in plan, mounted on pontoons, and supports that rotate by means of a hinge, whose axis is horizontal, characterized in that, in order to simplify installation work when installed on the seabed, each of the rotary supports is installed outside the contour of the working platform, the hinged fasteners of the supports being made at least in two levels on the pontoons, the upper ends of the supports and the corner zones of the platform are provided with devices for their mutual rigid fixation. yu jiai. A: & : d

Description

1 The invention relates to the construction and can be used in the design of deep-sea bases for drilling wells in the sea. A well-known platform for drilling wells in the sea, including a pontoon, a surface working platform with technological equipment placed on it, and supports moving from height through guides. devices in the platform. During the period when the platform is transported afloat, the supports rise up above the floating hull. After it arrives at the support installation site, the guide devices descend to the seabed lj. However, this deepwater base is characterized by a lack of stability of the entire system during transportation, as well as a complex system of lowering and raising the supports. A deep-water drilling base is known, including a working plane of a polygonal shape in plan, fixed on the pontoons, and supports that rotate by means of a hinge whose axis is horizontal 2j. The presence of sectional pivotally hinged supports (the fracture site is located under the pontoons) during the installation of the base to the bottom is determined by the need for complex ones. work on the hinge cap to the depths of the sea. In addition, since the hinge joint of the joint of the support sections, which must be turned into rigid during operation, is found at a great depth, the installation and disassembly of the deepwater base is made more difficult. The purpose of the invention is to simplify installation work when installing a deep-water base on the seabed. The goal is achieved by the fact that in a deep-water base for drilling, including a working platform of a polygonal shape in the plane, mounted on the pontoons, and supports turning by means of a hinge, the axis of which is horizontal , each of the pivot bearings is mounted outside the contour of the working platform, with the pivot bearing of the supports being at least 5 in two levels on the pontoons, and the upper ends of the supports and the corner zones The working platform is equipped with devices for their mutual rigid fixation. FIG. 1 shows a deepwater base mounted on a ground in FIG. 2 shows section A-A in FIG. 1j in fig. 3 - section bb in fig. 1 (during the period of transportation of a deepwater base) j in FIG. 4 shows a section B-B in FIG. 3, in FIG. 5 shows a base variant with a trapezoidal shape of the working platform. Deep-water oceans for drilling in the sea include a surface working platform 1 with technological equipment 2 installed on it, fixed by means of supporting structure 3 on the pontoon 4 with ballast tanks located in the pontoon. By means of the hinge 5 (of any of the known types), the pivot bearings 6, located in the corners of the base outside the contour of the working platform, can be freely rotated during the transportation period. The hinge fasteners are made in two levels, which allows the support to take a horizontal position during the transportation period. At the ends of the supports, disk gravity supports 7 can be fixed. To ensure the rigidity of the support structure, the truss structure 8 can be interconnected. For the rigidity of fixing the supports 6 and platform 1, the corner zones of the platform are provided. locking devices 9. The height of the top of the support from the hinge is received close to the height of the supporting structure 3, which allows the support to be fixed to the working platform not at the depth of the sea, but on the surface. During the transportation period, the pivot bearings located horizontally at the lower level can be attached to the pontoons with temporary fortifications 10. The deepwater base works as follows. Upon arrival of the deepwater base to the installation site, the temporary attachments 10 are removed, the supports due to water injection into the reservoirs (the components in their composition ballast tanks are rotated vertically and installed on the bottom. The platform is adjusted in height by matching the pontoon 4 with water.

After the base is installed, the supports 6 are rigidly fixed to platform 1 by means of locking

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Devices 9. Dismantling of platforms is performed in reverse order.

The advantage of the proposed structure in comparison with the known ones is a considerable simplification of installation and disassembly due to the possibility of rigid attachment of the supports to the working platform in the surface position.

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FIG.

Claims (1)

DEEP WATER BASIS FOR DRILLING, including a working platform of a polygonal shape in plan, mounted on pontoons, and supports turning by a hinge, the axis of which is horizontal, characterized in that, in order to simplify installation work when installed on the seabed, each of the rotary supports is installed outside the contour of the working platform, and the hinge fastenings of the supports are made at least in two levels on the pontoons, and the upper ends of the supports and the corner zones of the platform are equipped with devices for their mutual rigid fixation. S3 ABOUT