Floating drilling/mining marine base with shallow draft (options)

 

(57) Abstract:

The invention relates to marine bases for drilling and oil production. Floating drilling/mining marine base with shallow draft contains a floating body, which can be placed one or more modules or decks to support maintenance of rig equipment, accessories and cabins for staff. Drilling and/or extraction is carried out through the Central hole in the housing. In case there is a fixed ballast, area, oil storage, voids and AC ballast to counterbalance the lighter weight of the stored oil. The case is designed so that it has a relatively small area of the waterline. The case is also designed so that it has periods of on-Board and pitching, which upset about waves in the area where it should be installed this design. Achieved reduction of project cost and reducing the period of its implementation, and also provides the possibility to perform drilling operations with less exposure to changing weather conditions. 2 S. and 2 C.p. f-crystals, 8 ill.

The invention relates to the creation of a naval base the operations.

When the oil in the open sea floating structures used in areas where large sea depth leads to an unacceptably high for practical implementation cost stationary support blocks mounted on the seabed, which does not allow to obtain a sufficient economic effect, even with significant oil reserves. Such well-known floating structures include semi-submersible underground drilling rigs, marine base, which is fastened in place by means of a set of anchors, marine base with a dynamic setting, in which used many movers to hold the barge in a specific location, as well as the marine base with a vertical anchor bracket (TLP).

In each of the structures have certain advantages and disadvantages. For example, although the marine base with dynamic installation does not have the anchors and moorings, but they have a large surface area for exposure to waves and currents, which can lead to significant energy to hold it in place. The large surface area also leads to the fact that the naval base under the influence of waves gets vertical keel and rolling. Polypore adversely keel and side rolling, however, they are still susceptible to vertical motion, in addition, they are not designed to store large quantities of oil.

Minimizing created the environment movement is desirable not only for reasons of safety and comfort, but also from operational considerations, as drilling and mining connections must be designed taking into account the displacements of the structure. The cost of designing and constructing connections is directly related to the magnitude of the vertical, pitching and rolling motion of the structure.

TLP makes it relatively successfully to minimize vertical keel and rolling. However, the TLP is a structure with a large draught, which is designed primarily for deep-water areas, where the sea can be relatively rapid.

Known floating drilling /mining marine base with a shallow draft that contains a floating body having a partition AC ballast inside and vertically passes through the bore /see U.S. patent N 3837309, publ. 24.09.74, class B 63 B 35/44/.

This floating drilling/mining marine base with shallow draft is selected as the closest analogue of the invention.

The technical result of the invention is to provide a floating marine base, where the hull and deck can be designed independently from each other and assembled on the spot, which is not necessarily the end point of production, which reduces the cost of the project and reduces the time of its introduction, as well as the creation of a floating offshore Foundation, which has favorable characteristics vertical, pitching and rolling motion that allows the use of steel riser column for drilling and production, as well as to perform drilling operations with less exposure to changing weather conditions.

It is achieved by the floating drilling/mining marine base with a shallow draft that contains a floating body having a partition AC ballast inside and vertically through the borehole, a floating frame includes end sections that limit at least one U-shaped section in the specified case, and the top of the U-shaped section is located above the waterline, and the base of the U-shaped section is under vodovar U-shaped section, and also contains a section of fixed ballast at the lower end of this casing section oil storage within the specified enclosure, and the storage section oil is balanced with sea pressure, and a partition in the lower part of the U-shaped sections of the specified body.

The invention is illustrated by drawings.

In Fig. 1 shows a view in isometric device in accordance with the present invention.

In Fig. 2 shows the outboard device profile with the established decks in accordance with the present invention.

In Fig. 3 shows bortovoy device profile with the established decks in accordance with the present invention.

In Fig. 4 shows a cross-section on the line 4-4 of Fig. 3.

In Fig. 5 shows a cross-section on the line 5-5 of Fig. 3.

In Fig. 6 shows a cross-section on the line 6-6 of Fig. 3.

In Fig. 7 shows a cross-section on the line 7-7 of Fig. 4.

In Fig. 8 shows a cross-section on the line 8-8 of Fig. 4.

We now turn to a consideration of Fig. 1, which shows an example of construction of the device in accordance with the present invention, which in General is indicated by position 10. Floating marine base with shallow draft 10 includes a floating body 12, to the frame of the ballast, and section 20 for receiving and installation of modules or decks operational equipment, drilling rig, accessories and cabins for staff. The housing 12 also has a bore 22, which passes vertically through the housing to install the riser columns used in the drilling and production of wells on the seabed.

In accordance with a preferred variant of the present invention, the section 14 of the fixed ballast is located on the lower end of the housing 12. When placing a fixed ballast at the lower end of construction the center of gravity below the center of buoyancy. Fixed ballast may be formed of any suitable material, such as concrete, which reduces construction costs. Needless to say, the thickness and weight of the fixed ballast will depend on the size, weight and displacement of the structure.

Section 16 for the storage of oil has a balanced pressure due to the intake it sea water from the base. This is shown in Fig. 3, where the position 17 shown equilibrating seawater in section 16. If you need to meet certain requirements for the design of oil tankers, the section 16 d 4, 5, 7 and 8 provide the buoyancy of the marine base 10. Plots of variable ballast 21 section 18, which can be seen in Fig. 3, 6 and 8, are used to counterbalance the lighter weight of the stored oil. To maintain a constant precipitation requires approximately one cubic foot (28,3 DM3) sea water to counterbalance the buoyancy of one barrel of oil. A constant rainfall is desirable, because the riser column is connected to the seabed and relative movement of the armature is limited.

As is best seen in Fig. 1-3, the housing 12 is designed in such a way and has such a shape that when it is in working draft, indicated by the line 24, the area of the waterline of the hull is much smaller than u, the lower area of the main part of the building. This is achieved by providing the cavities 19 in the center and on each end of the housing, which can be seen in Fig. 3, 4, 5 and 8 that are coming up from each of the end sections and the Central section of the body and are mainly formed by U-shaped or cut-away section at each end of the body and in the center. When working upsetting the top of the U-shaped section is located above the waterline, and the base of the U-shaped Seki area for the case of the working rainfall corps-level section 16 for the storage of oil, what is true for ships. The relatively small area of the waterline provides long natural period of heave corps, which is much longer than the period of the waves.

Periods of on-Board and pitching corps have the detuning relative to the waves so that the sea base makes a favorable move with side and pitching motion. Moving sea base can be further improved by providing a partition 26 in the U-shaped or cut-away sections at each end of the casing above the partition 21 AC ballast. Septum 26 is shown in Fig. 4 and is formed by means of vertical walls that come between the leaf cavities 19 and the Central section of the housing. When working draft partitions 26 reduce the effect during the free surface sea water moving between the walls of the housing, which support the deck. The Central U-shaped section is designed so that when a working draft it is above the waterline, allowing you to protect riser columns in the Central bore 22 from the impact of waves.

During operation of the section AC ballast 21 marine base 10 can be used for analena draught of 13.5 meters. When towing the marine base to the place of installation can be installed more stable sludge, from 15 to 21 meters. In the operations of drilling and/or production of oil, can be installed sediment 48 meters, as shown in Fig. 1 and 2. It should be borne in mind that shown in Fig. 1 and 2 size freeboard, component 9 meters, shown only as an example, under certain sea conditions, more preferably 13.5 metres.

Marine base 10 is designed so that it can be mounted in different locations of the base modules or decks for operational equipment, drilling rig, accessories and cabins for staff. This provides an advantage in the sequence of construction and installation, which significantly reduces the cost of the project and reduces the timeframe. Installation of decks can be carried out by immersing the structure 10 by means of ballast to precipitation, in which the barge, which has a deck, can swim on the slice of the body and can be installed above the support sections 20. After that the deck can be carried on the body or by immersion of the barge due to the increase in ballast, or substitution decks marine base 10 may be towed to the working location, where then produce the placing of ballast to obtain the desired working rainfall and moor in place.

Riser drilling and production columns that should be used at the marine base 10, can be selected from various types of columns, known in marine mining.

Another additional characteristic of the marine base 10 is shown in Fig. 3 the wall of the limitations of thread 28. The wall 28 prevents the resonance of the vertical fluctuations of the water level in the well 22, if their period coincides with the period of the wave. The dimensions of the wall is chosen in such a way as to ensure the total hole for the flow of water, comprising approximately twenty to thirty percent of the cross-sectional area of the bore 22.

Shown in the drawings, the sea base can have the following digital data. Marine base 10 may include deck construction weighing 10,000 tons, placed on her cargo 31900 t, that is, with the full weight of 41.900 so Section 16 oil storage allows you to store 1,500.000 barrels of oil. The weight of the steel structure of the housing 12 is approximately 60.000 t, when the displacement 514.000 t and at a fixed ballast 72100 so Well 22 can have 40 cutouts for BNY only as examples and do not limit the scope of patent claims.

1. Floating drilling/mining marine base with a shallow draft that contains a floating body having a partition AC ballast inside and vertically through the borehole, wherein the floating body includes end sections that limit at least one U-shaped section in the specified case, and the top of the U-shaped section is located above the waterline, and the base of the U-shaped section is under water in case of installation of casing with a working draft, with the specified enclosure adapted to receive the top deck of a U-shaped section, and also contains a section of fixed ballast at the lower end of the casing and the partition storage of oil within the specified enclosure.

2. Floating drilling/mining marine base on p. 1, characterized in that the storage section is oil is balanced with sea pressure.

3. Floating drilling/mining marine base on p. 1, characterized in that it additionally includes a partition in the lower part of the U-shaped sections of the specified body.

4. Floating drilling/mining marine base with a shallow draft that contains a floating body having a partition AC ballast inside it and Vitoria limit at least one U-shaped section in a specific case, the top of the U-shaped section is located above the waterline, and the base of the U-shaped section is under water in case of installation of casing with a working draft, with the specified enclosure adapted to receive the top deck of a U-shaped section, and also contains a section of fixed ballast at the lower end of this casing section oil storage within the specified enclosure, and the storage section oil is balanced with sea pressure, and a partition in the lower part of the U-shaped sections of the specified body.

 

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