CN215290042U - Platform for offshore marginal oil field development - Google Patents
Platform for offshore marginal oil field development Download PDFInfo
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- CN215290042U CN215290042U CN202120984349.9U CN202120984349U CN215290042U CN 215290042 U CN215290042 U CN 215290042U CN 202120984349 U CN202120984349 U CN 202120984349U CN 215290042 U CN215290042 U CN 215290042U
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Abstract
The utility model provides a platform for offshore marginal oil field development, including upper portion chunk and lower part foundation structure, lower part foundation structure includes by lower supreme steel cylinder, concrete top cap and the concrete changeover portion that sets gradually, the concrete changeover portion with the upper portion chunk is connected, the steel cylinder includes steel section of thick bamboo wall, be provided with steel subdivision board in the inner space that steel section of thick bamboo wall encloses, steel section of thick bamboo wall top and steel subdivision board top all with concrete top cap fixed connection, steel section of thick bamboo wall the steel subdivision board with the concrete top cap constitutes a plurality of bottom open-ended sealed subdivision. The utility model discloses can strengthen the transportation by flotation stability of the marine air supporting of platform towing navigation in-process to anti the ability of sliding, toppling after the structure has sunk the seabed has been increased.
Description
Technical Field
The utility model relates to an offshore oil engineering technical field, more specifically relates to a platform for offshore marginal oil field development.
Background
The capacity of large and medium oil and gas fields in offshore in-service in China is gradually reduced year by year, newly discovered whole oil fields are fewer and fewer, and the acceleration of the development of offshore marginal oil fields becomes the key point of oil and gas development in China. With continuous exploration and practice in the field of marginal oil field development in recent years in China, a mode and equipment facilities for marginal oil field development are preliminarily formed, and for example, a pile foundation type or cylinder foundation type simple jacket platform is adopted to enable part of marginal oil fields to be economically developed. However, as the investment of the jacket platform is high, most marginal oil fields cannot be developed due to no economic benefit, the large-scale development of the marginal oil fields is difficult to realize, and the economic and efficient development of marine oil and gas resources in China is severely restricted.
Therefore, a technical scheme for inventing offshore marginal oil field oil and gas resources is urgently needed in the prior art to solve the problem that the conventional jacket platform cannot be applied to economic and large-scale development of the marginal oil field in China.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a platform for offshore marginal oil field development.
In order to achieve the above purpose, the utility model provides the following technical scheme.
The utility model provides a platform for offshore marginal oil field development, includes upper portion chunk and lower part foundation structure, lower part foundation structure includes by lower supreme steel cylinder, concrete top cap and the concrete changeover portion that sets gradually, the concrete changeover portion with the upper portion chunk is connected, the steel cylinder includes steel section of thick bamboo wall, steel section of thick bamboo wall comprises two rectangular steel plates and two semi-circular arc steel plates, and two rectangular steel plates set up relatively, and two semi-circular arc steel plates set up relatively, be provided with steel subdivision board in the inner space that steel section of thick bamboo wall encloses, steel section of thick bamboo wall top and steel subdivision board top all with concrete top cap fixed connection, steel section of thick bamboo wall, steel subdivision board with the concrete top cap constitutes a plurality of bottom open-ended sealed subdivision.
The sealed sub-cabin is divided into three areas comprising two semicircular areas at two sides and a middle rectangular area; the steel compartment plate comprises a circular compartment plate and a vertical compartment plate; the circular bulkhead plate is tangent to the steel cylinder wall, and the circular bulkhead plate is arranged in the middle rectangular area; a circular cabin is arranged in the center of the middle rectangular area and is communicated with the interior of the concrete transition section; the vertical cabin dividing plate is arranged between the circular cabin and the circular cabin dividing plate, and divides the space between the circular cabin and the circular cabin dividing plate into a plurality of intermediate cabins at equal angles; the semicircular areas on the two sides are symmetrically arranged relative to the middle rectangular area, and a side cabin is arranged in each semicircular area.
The middle cabin and the side cabins are provided with water pumping/draining pipeline interfaces which are connected with pipelines, and the pipelines are connected with valves; and air valves are arranged on the middle cabin and the side cabins.
The number of the middle cabins is six.
The number of the side cabins is eight, and four side cabins are arranged at four corners of the middle rectangular area respectively.
The height of the steel bulkhead plate is not more than that of the steel cylinder wall.
The utility model has the advantages that: the self-floating of the platform on water is realized by effectively utilizing the air flotation principle characteristic of the cylinder type foundation, the floating stability of the platform in the process of offshore air flotation towing is enhanced by utilizing the large-size oval steel cylinder structure, and the anti-sliding and anti-overturning capacity of the structure after sinking into the sea bottom is increased; meanwhile, the platform can be integrally built on land and integrally installed on the sea in a self-floating manner, and a large-scale crane ship and machines are not needed for offshore installation, so that the offshore construction cost and the construction period are greatly reduced; after the oil field is in service, the oil field can be moved to the next oil field for reuse, so that the disposal cost is saved, the project investment is shared, and the platform economy is improved; and a novel low-cost facility is provided for marginal oil field development.
Drawings
FIG. 1 is a front view of a platform for offshore marginal field development.
Fig. 2 is a top view of a concrete cap.
Fig. 3 is a diagram of a single cylinder capsule inside a steel cylinder.
In the figure: 1-a steel cylinder; 11-steel cylinder wall; 12-steel deck boards; 121-circular deckboard; 122-vertical deckboard; 13-a circular chamber; 14-a middle cabin; 15-side compartment; 2-concrete top cover; 3-concrete transition section; 4-upper block.
Detailed Description
The present invention will be further described with reference to the following examples.
The platform for offshore marginal oil field development as shown in fig. 1-3 comprises an upper block 4 and a lower base structure, wherein the lower base structure comprises a steel cylinder 1, a concrete top cover 2 and a concrete transition section 3 which are sequentially arranged from bottom to top, the concrete transition section 3 is connected with the upper block 4, the steel cylinder 1 comprises a steel cylinder wall 11, and the steel cylinder wall 11 is composed of two rectangular steel plates and two semicircular arc-shaped steel plates. The steel cylinder wall 11 has the length of 60-65m, the width of 28-32m, the height of 8-10m and the wall thickness of 10-50mm, and in the embodiment, the steel cylinder wall 11 has the length of 60m, the width of 30m, the height of 10m and the wall thickness of 25 mm.
The steel bulkhead 12 is arranged in the inner space surrounded by the steel cylinder wall 11, the height of the steel bulkhead 12 is not more than that of the steel cylinder wall 11, the wall thickness ranges from 10mm to 30mm, and the wall thickness is 10mm in the embodiment. The top of the steel cylinder wall 11 and the top of the steel subdivision plate 12 are both fixedly connected with the concrete top cover 2, the top of the steel cylinder wall 11 and the top of the steel subdivision plate 12 are both inserted into the concrete top cover 2 and are fixedly connected with the concrete top cover, the insertion depth range is 0.1-1m, and the insertion depth of the embodiment is 0.5 m; the thickness of the concrete top cover 2 is 0.2-0.6 m, and the middle part of the concrete top cover 2 is provided with a hole with the diameter of 6-10m and is communicated with the inner space of the concrete transition section 3 for an oil production line to penetrate through and enter mud.
The steel cylinder wall 11, the steel subdivision plate 12 and the concrete top cover 2 form a plurality of sealed subdivision with open bottoms. The sealed sub-cabin is divided into three areas comprising two semicircular areas at two sides and a middle rectangular area; the steel deck plate 12 includes a circular deck plate 121 and a vertical deck plate 122; the circular subdivision plate 121 is tangent to the steel cylinder wall 11, and the circular subdivision plate 121 is arranged in the middle rectangular area; the center of the middle rectangular area is provided with a circular chamber 13, the diameter of which is 10 m. The round cabin 13 is communicated with the interior of the concrete transition section 3; the vertical compartment plate 122 is arranged between the circular compartment 13 and the circular compartment plate 121, and divides the space between the circular compartment 13 and the circular compartment plate 121 into a plurality of intermediate compartments 14 at equal angles; in this embodiment, the number of the intermediate compartments 14 is six. The semicircular areas on the two sides are symmetrically arranged relative to the rectangular area in the middle, and each semicircular area on the two sides is provided with a side cabin 15, in the embodiment, the number of the side cabins 15 is eight, and four corners of the rectangular area in the middle are respectively provided with four side cabins 15.
The middle cabin 14 and the side cabin 15 are provided with water pumping/draining pipeline interfaces which are connected with pipelines, and the pipelines are connected with valves; air valves are arranged on the middle chamber 14 and the side chamber 15.
The construction method of the platform for offshore marginal oilfield development comprises the following steps:
a. assembling the steel cylinder wall 11, the steel bulkhead 12 and the prefabricated upper block 4 on land;
b. connecting the thin-wall profiled steel sheet to the top of the steel cylinder wall 11 and the steel bulkhead plate 12 to form a cylinder-shaped structure with an opening at the bottom;
c. integrally hoisting the cylindrical structure into water on the land bank, and checking the air tightness;
d. binding steel bars and pouring concrete on the thin-wall profiled steel plate at the top of the cylindrical structure, and constructing a concrete top cover 2 and a concrete transition section 3;
e. after the construction of the concrete top cover 2 and the concrete transition section 3 is completed and the design strength requirement is met, connecting the upper module 4 to the top of the concrete transition section 3 to form a platform whole, and transporting the platform to a construction site in a floating mode for sinking installation;
f. in the sinking installation process, the floating crane is used for assisting, the air valves on the middle cabin 14 and the side cabins 15 are opened, the platform is exhausted and sinks, when the bottom of the steel cylinder 1 contacts the seabed, water is pumped through the drain pipe, the platform sinks to the designed position under the negative pressure, and the installation construction of the platform is completed;
g. the drilling platform is positioned at a certain distance on the periphery of the steel cylinder 1, a cantilever beam of the drilling platform is moved to the center of the top of the concrete transition section 3, a connecting channel is established with the upper module 4 and a water-proof casing pipe in the concrete transition section 3, and drilling operation is implemented;
h. after the drilling operation is finished, the submarine cable, the submarine oil and water injection pipeline are laid from the outer wall of the concrete transition section 3 to the top of the upper module 4, and the wellhead is connected and debugged to produce oil and gas fields;
i. after the oil and gas field is in service, the oil and gas field is abandoned through the water-blocking sleeve in the concrete transition section 3, the submarine cable, the submarine oil transportation pipeline and the water injection pipeline at the bottom of the outer wall of the concrete transition section 3 are removed, then the middle cabin 14 and the side cabins 15 in the steel cylinder 1 are filled with water and inflated with air through the assistance of the floating crane, and the steel cylinder is used for jacking a platform developed in the offshore marginal oil field and is recovered or moved to the next construction site for installation.
The above is only the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (6)
1. The platform for offshore marginal oil field development comprises an upper portion block (4) and a lower portion base structure, and is characterized in that the lower portion base structure comprises a steel cylinder (1), a concrete top cover (2) and a concrete transition section (3) which are sequentially arranged from bottom to top, the concrete transition section (3) is connected with the upper portion block (4), the steel cylinder (1) comprises a steel cylinder wall (11), the steel cylinder wall (11) is composed of two rectangular steel plates and two semicircular arc-shaped steel plates, the two rectangular steel plates are oppositely arranged, the two semicircular arc-shaped steel plates are oppositely arranged, a steel cabin distribution plate (12) is arranged in an inner space defined by the steel cylinder wall (11), the top of the steel cylinder wall (11) and the top of the steel cabin distribution plate (12) are fixedly connected with the concrete top cover (2), and the steel cylinder wall (11), The steel subdivision plates (12) and the concrete top cover (2) form a plurality of sealed subdivision with bottom openings.
2. The platform for offshore marginal oilfield development as defined in claim 1, wherein the sealed sub-tank is divided into three regions in total, including two semi-circular regions on both sides and a rectangular region in the middle; the steel bulkhead plate (12) comprises a circular bulkhead plate (121) and a vertical bulkhead plate (122); the circular bulkhead (121) is tangent to the steel cylinder wall (11), and the circular bulkhead (121) is arranged in the middle rectangular area; a round cabin (13) is arranged at the center of the middle rectangular area, and the round cabin (13) is communicated with the interior of the concrete transition section (3); the vertical compartment plate (122) is arranged between the circular compartment (13) and the circular compartment plate (121), and divides a space between the circular compartment (13) and the circular compartment plate (121) into a plurality of intermediate compartments (14) at equal angles; the semicircular areas on both sides are arranged symmetrically with respect to the middle rectangular area, and a side compartment (15) is arranged in each semicircular area.
3. Platform for offshore marginal oilfield development according to claim 2, wherein the intermediate tank (14) and the side tanks (15) are each provided with a suction/drainage pipe connection, the suction/drainage pipe connection being connected with a pipe, the pipe being connected with a valve; and air valves are arranged on the middle cabin (14) and the side cabins (15).
4. Platform for offshore marginal field development according to claim 2, characterized in that the number of the intermediate cabins (14) is six.
5. Platform for offshore marginal oilfield development according to claim 2, wherein the number of sidecars (15) is eight, four sidecars (15) being provided at each of the four corners of the central rectangular area.
6. Platform for offshore marginal oilfield development according to claim 1, characterized in that the steel bulkhead (12) has a height not greater than the height of the steel cylinder wall (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120984349.9U CN215290042U (en) | 2021-05-10 | 2021-05-10 | Platform for offshore marginal oil field development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120984349.9U CN215290042U (en) | 2021-05-10 | 2021-05-10 | Platform for offshore marginal oil field development |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215290042U true CN215290042U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120984349.9U Active CN215290042U (en) | 2021-05-10 | 2021-05-10 | Platform for offshore marginal oil field development |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215290042U (en) |
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2021
- 2021-05-10 CN CN202120984349.9U patent/CN215290042U/en active Active
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