CN219886756U - Self-elevating oil storage system based on ocean drilling and oil production platform - Google Patents

Abstract

The utility model discloses a self-elevating oil storage system based on an ocean drilling and oil production platform, which comprises a platform main body (1), an upright post (2), a first elevating mechanism (3), a bracket (4), an oil storage tank (5) and a second elevating mechanism (6), wherein the platform main body (1) is erected on the upright post (2); the first lifting mechanism (3) is arranged on the platform main body (1), is connected with the upright post (2) and is used for driving the platform main body (1) to lift relative to the upright post (2); the bracket (4) is erected on the upright post (2) and is used for bearing the oil storage tank (5) and positioned below the platform main body (1); the second lifting mechanism (6) is arranged on the support (4), is connected with the upright post (2) and is used for driving the support (4) to lift relative to the upright post (2). According to the utility model, the lifting oil storage tank is arranged, so that the power requirement of crude oil unloading operation on the pump can be reduced, and disturbance of water surface waves on the oil storage tank can be avoided.

Description

Self-elevating oil storage system based on ocean drilling and oil production platform

Technical Field

The utility model relates to the field of offshore oilfield operation platforms. More particularly, the utility model relates to a self-elevating oil storage system based on a marine drilling and oil production platform.

Background

The oil storage tanks equipped on the offshore oilfield operation platform can be divided into three types of water, water surface and underwater oil storage tanks according to the positions of the oil storage tanks.

The above-water oil storage cabin is that an oil storage cabin is arranged on a platform above a water surface, for example, an oil storage platform for offshore oil and gas production is disclosed in the prior patent with the patent number of CN201043270Y, an upper deck, a middle deck and a lower deck are arranged above the water surface, and an oil storage tank is arranged on the lower deck. The arrangement occupies a large space for the operation platform, increases the bearing capacity of the pile legs of the platform, and leads to limited oil storage capacity.

The water surface oil storage cabin is a ship-shaped oil storage cabin and is fixed through a mooring device and floats on the water surface. Due to the existence of water surface disturbance such as sea waves, the stability of the water surface oil storage cabin is difficult to maintain.

The underwater oil storage cabin is a movable production platform with the underwater oil storage cabin, which is arranged below the water surface, for example, the movable production platform with the underwater oil storage cabin disclosed in the prior patent No. CN102051872A can be lowered to the sea surface through a lifting system and towed to a new operation place by a tugboat for continuous use, and the oil storage cabin is fixed on the sea bottom to accumulate crude oil, so that dependence on the tugboat is reduced. However, such tanks are located on the sea floor, with long pipes, and require a large pump power for loading or unloading the oil.

In addition, the underwater oil storage tank also comprises an oil storage tank floating below the water surface and above the sea floor, namely a suspension type oil storage tank, but the problem of fixing the oil storage tank is not solved yet.

In view of the foregoing, it is highly desirable to provide a working platform with an oil tank, which saves labor in loading and unloading oil, and has high stability.

Disclosure of Invention

In order to solve the problems, the utility model provides a self-elevating oil storage system based on an ocean drilling and oil extraction platform, which comprises a platform main body 1, an upright post 2, a first elevating mechanism 3, a bracket 4, an oil storage tank 5 and a second elevating mechanism 6, wherein the platform main body 1 is erected on the upright post 2; the first lifting mechanism 3 is arranged on the platform main body 1, connected with the upright post 2 and used for driving the platform main body 1 to lift relative to the upright post 2; the bracket 4 is erected on the upright post 2 and is used for bearing the oil storage tank 5 and positioned below the platform main body 1; the second lifting mechanism 6 is arranged on the support 4, connected with the upright post 2, and is used for driving the support 4 to lift relative to the upright post 2.

According to one embodiment of the present utility model, the support 4 includes a bearing portion 41 and a lifting portion 42, the bearing portion 41 bearing the oil tank 5, and the lifting portion 42 extends vertically and is connected to the second lifting mechanism 6.

According to one embodiment of the utility model, the oil storage tank 5 is provided with an oil port 51 and a sea water port 52; the oil port 51 is connected with an oil pipe 7 provided with an oil pump 71; the seawater port 52 is connected with a seawater pipeline 8 provided with a water pump 81; a first oil-insulating film 501 which separates an oil port 51 from a sea water port 52 is provided in the oil storage tank 5; the first oil-separating film 501 is an elastic film and is sized to fill the oil tank 5 with crude oil or seawater.

According to one embodiment of the utility model, the oil pump 71 is arranged on the support 4 and the water pump 81 is arranged on the housing of the oil reservoir 5.

According to one embodiment of the utility model, the oil tank 5 is further provided with a vent 53; the air vent 53 is connected with an air pipeline 9; an air pump 91 is arranged on the air pipeline 9; a second oil-insulating film 502 is disposed inside the oil tank 5, and the second oil-insulating film 502 is disposed around the air vent 53.

According to one embodiment of the utility model, the tank 5 is provided with a counterweight which is sized such that the average density of the tank 5 differs from the sea water density by less than 1% when the tank 5 is full of crude oil.

According to one embodiment of the utility model, a welded or detachable connection is fixedly provided between the support 4 and the oil reservoir 5.

According to one embodiment of the present utility model, racks are provided on the upright 2, and gears meshed with the racks are provided on the first lifting mechanism 3 and the second lifting mechanism 6, and are driven by a motor or an oil cylinder.

According to one embodiment of the utility model, the upright 2 is provided with a limiting block, and the limiting block is arranged below the bracket 4 and is used for bearing the bracket 4 when the bracket 4 descends to the lowest point.

According to one embodiment of the utility model, the oil tank 5 is provided with a through hole through which the upright 2 is arranged.

According to the utility model, the lifting oil storage tank is arranged, so that the power requirement of crude oil unloading operation on the pump can be reduced, and disturbance of water surface waves on the oil storage tank can be avoided. By arranging the structure of the crude oil and seawater replacement system, the oil storage tank is protected from larger pressure difference. Through the structure that sets up the air vent, realize the regulation of oil storage tank average density, reduce second elevating system's burden. The oil storage tank is enabled to float on the water surface through buoyancy by arranging the balancing weight, and the burden on the second lifting mechanism is reduced when crude oil is unloaded. And the second lifting mechanism is protected by arranging a limiting block.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 shows a schematic diagram of a jack-up oil storage system based on a marine drilling and production platform;

FIG. 2 shows a schematic view of a bracket;

FIG. 3 shows a schematic diagram of an oil storage tank;

FIG. 4 shows a schematic view of a vented oil storage tank;

fig. 5 shows a schematic view of a work platform comprising a stop block.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification and claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present specification and claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

Fig. 1 shows a schematic diagram of a jack-up oil storage system based on a marine drilling, production platform.

As shown in fig. 1, a self-elevating oil storage system based on a marine drilling and oil production platform comprises a platform main body 1, a stand column 2, a first elevating mechanism 3, a bracket 4, an oil storage tank 5 and a second elevating mechanism 6, wherein the platform main body 1 is erected on the stand column 2; the first lifting mechanism 3 is arranged on the platform main body 1, connected with the upright post 2 and used for driving the platform main body 1 to lift relative to the upright post 2; the bracket 4 is erected on the upright post 2 and is used for bearing the oil storage tank 5 and positioned below the platform main body 1; the second lifting mechanism 6 is arranged on the support 4, connected with the upright post 2, and is used for driving the support 4 to lift relative to the upright post 2.

The platform main body 1 is used for carrying living facilities, crude oil processing facilities and the like, the platform main body 1 is lifted by the first lifting mechanism 3, and the lifting equipment of the present utility model or the future utility model is adopted as a connecting structure, and the utility model is not limited. The first lifting mechanism 3 is arranged on the platform main body 1, which means that the first lifting mechanism 3 is fixedly connected with the platform main body 1, and the first lifting mechanism 3 can comprise power equipment such as an oil cylinder, a motor and the like, and can also comprise transmission equipment such as a traction rope or a gear and the like. For example, the first lifting mechanism 3 includes a gear driven by a cylinder, a rack meshed with the gear is vertically disposed on the upright post 2, the first lifting mechanism 3 is disposed around the upright post 2, so that the gear and the rack are in a meshed state, and the cylinder drives the gear to rotate, so that the first lifting mechanism 3 lifts along the upright post 2, thereby driving the platform main body 1 to lift. When the operation platform is towed to an operation position, the upright post 2 is fixed on the sea bottom, and the platform main body 1 is lifted to a certain height from the sea surface through the first lifting mechanism 3, so that the operation activity of unfolding is facilitated.

The stand columns 2 are generally arranged around the platform main body 1 to play a strong supporting and fixing role, and avoidance holes can be formed in the center of the platform or any position of the platform main body 1 according to requirements, so that the stand columns 2 penetrate.

A bracket 4 is arranged below the platform main body 1, and the bracket 4 has two functions, namely, a bearing oil storage tank 5 and a liftable connection with the upright post 2. The second lifting mechanism 6 is fixed on the bracket 4, and the second lifting mechanism 6 may have the same or different structure as the first lifting mechanism 3, and the present utility model is not limited thereto.

When the working platform is towed to the working position, the platform main body 1 is lifted to the working height, and the second lifting mechanism 6 controls the bracket 4 to lift, so that the oil storage tank 5 floats at the position of the water surface or the oil storage tank 5 is lowered below the water surface.

In the present utility model, the location of the oil storage tank 5 may be in three states, the first being above the water surface, the second being below the water surface, and the third being below the water surface. When the operation platform is used for oil extraction and processing, the oil storage tank 5 can be adjusted to be below the water surface, so that disturbance of waves to the oil storage tank 5 is reduced. In the case of the oil unloading operation, the oil storage tank 5 may be lifted above the water surface or above the water surface.

For example: when crude oil produced by the operation platform needs transportation of the oil tanker, and crude oil is conveyed from the oil storage tank 5 to the oil tanker, if the oil storage tank 5 is positioned below the water surface, the oil pump is required to have larger power, when the oil storage tank 5 is positioned on the water surface, the oil transportation has lower requirement on the output power of the oil pump, and meanwhile, the buoyancy of water to the oil storage tank 5 is fully utilized, so that the pressure to the second lifting mechanism 6 can be reduced.

Although the oil pump power required for delivering oil to the tanker is smaller when the oil storage tank 5 is above the water surface, and gravity can be relied on to realize the self-flow of crude oil, the pressure on the second lifting mechanism 6 is too high at this time, and the utility model can achieve the state, but is not the optimal use scheme of the utility model.

For another example: crude oil produced by the operation platform and the operation platform are jointly transferred, so that the platform main body 1 can be lowered to the water surface, the oil storage tank 5 is lifted to the position below the platform main body 1 and is close to the platform main body 1, the upright post 2 is retracted, and the whole operation platform is towed.

Also for example: when the wave is too big, can form horizontal and vertically disturbance at the surface of water, if oil storage tank 5 is located the surface of water, can cause great interference, descends the certain degree of depth below the less surface of water of wave influence with oil storage tank 5 this moment, not only can avoid the wave to the disturbance of oil storage tank 5, oil storage tank 5 can also be as steady solid, provides firm support to stand 2.

The bracket 4 is made of rigid materials, and can be fixedly connected with the oil storage tank 5 by welding, riveting and the like, or can be detachably fixedly connected by a bolt, for example.

The bracket 4 provides the installation position of the second lifting mechanism 6, so that the cylinder body can be prevented from being stressed. Preferably, the support 4 forms a tray structure, which supports the oil storage tank 5 from the bottom.

According to the working platform with the liftable oil storage tank, the oil storage tank 5 is fixed through the upright post 2 in the bearing state of the bracket 4, and the stability is high. The lifting adjustment can be carried out along the upright post 2 to be below the water surface, so that disturbance of waves to the operation platform is reduced. The lifting adjustment can be carried out along the upright post 2 to the water surface, so that the dependence on the output power of an oil pump when crude oil is unloaded is reduced.

Fig. 2 shows a schematic view of a stent.

As shown in fig. 2, the bracket 4 includes a bearing portion 41 and a lifting portion 42, the bearing portion 41 bears the oil tank 5, and the lifting portion 42 extends vertically and is connected to the second lifting mechanism 6.

The bearing part 41 and the lifting part 42 are different parts of the bracket 4, and can be integrally formed or assembled after being separately constructed.

The bearing portion 41 is used for bearing the oil tank 5, and may be configured as a planar structure as shown in fig. 2, or may be configured as a semi-or full-enclosed structure, so as to fit the outer shape of the oil tank 5. It may be provided in a truss structure so as to reduce the weight of the carrying portion 41.

The lifting portion 42 is used to connect the second lifting mechanism 6, and by setting the height of the vertical extension of the lifting portion 42, the distance between the second lifting mechanism 6 and the oil storage tank 5 can be controlled. For example, the vertically extending lifting portion 42 has a top end connected to the second lifting mechanism 6 and a bottom end connected to the bearing portion 41, so that the second lifting mechanism 6 maintains a level difference from the oil tank 5. When the oil storage tank 5 is regulated to descend below the water surface, the second lifting mechanism 6 can still be positioned above the water surface due to the height of the lifting part 42, so that the influence of seawater on the second lifting mechanism 6 is avoided.

Fig. 3 shows a schematic diagram of an oil storage tank.

As shown in fig. 3, the oil tank 5 is provided with an oil port 51 and a seawater port 52; the oil port 51 is connected with an oil pipe 7 provided with an oil pump 71; the seawater port 52 is connected with a seawater pipeline 8 provided with a water pump 81; a first oil-insulating film 501 which separates an oil port 51 from a sea water port 52 is provided in the oil storage tank 5; the first oil-separating film 501 is an elastic film, and is configured to fill the oil tank 5 with crude oil or seawater.

The oil storage tank 5 may have a structure of one integral chamber as shown in fig. 3, or may have a structure of a plurality of chambers combined, when a plurality of chambers are included, the first oil-separating film 501 is correspondingly provided in a plurality, the structure of each chamber is similar to that of a single chamber shown in fig. 3, the oil ports 51 are mutually communicated or independent, the seawater ports 52 are mutually communicated or independent, and the oil pipeline 7 and the seawater pipeline 8 are commonly or independently provided between the chambers.

As shown in fig. 3, the oil port 51 is used for loading and unloading crude oil, and is driven by the oil pump 71 through the oil pipe 7. The seawater port 52 is used for loading and unloading seawater, and is driven by a water pump 81 through a seawater pipe 8. The oil storage tank 5 is internally provided with a first oil-insulating film 501, which has a certain elasticity, and when the crude oil is loaded, the first oil-insulating film 501 is bent toward the sea water port 52 side until the crude oil is fully loaded. When unloading crude oil, the first oil-separating film 501 is bent toward the oil port 51 side until the seawater is filled. The oil port 51, the seawater port 52, and the first oil-separating film 501 form a crude oil and seawater replacement system, so as to protect the oil storage tank 5 from a large pressure difference.

The size, elastic coefficient, etc. of the first oil-separating film 501 are selected so that when the crude oil is fully loaded or the seawater is fully loaded, a certain pressure is formed on the oil port 51 or the seawater port 52, so that the oil or the seawater can be conveniently unloaded. For example, when the crude oil or sea water loading reaches 75% full, the first oil-separating film 501 remains in a relaxed state, and when it is greater than 75%, the first oil-separating film 501 is deformed by compression, providing a certain reaction force.

The oil pump 71 is disposed on the bracket 4, and the water pump 81 is disposed on the housing of the oil tank 5. The oil pump 71 is arranged on the bracket 4, and can be always kept above the water surface, so that the oil pump 71 is prevented from being corroded by seawater. The oil port 51 is provided on the side or bottom of the oil tank 5, and the seawater port 52 is provided on the side or bottom of the oil tank 5, so that the liquid in the oil tank 5 can be emptied.

Fig. 4 shows a schematic view of a vented oil storage tank.

As shown in fig. 4, the oil tank 5 is further provided with a vent 53; the air vent 53 is connected with an air pipeline 9; an air pump 91 is arranged on the air pipeline 9; a second oil-insulating film 502 is disposed inside the oil tank 5, and the second oil-insulating film 502 is disposed around the air vent 53.

The air vent 53 is arranged at the top of the oil storage tank 5, the air vent 53 is connected with the air pipeline 9, and air can enter the oil storage tank 5 through the driving of the air pump 91. The second oil-insulating film 502 is also an elastic film structure, and the second oil-insulating film 502 isolates air from crude oil. The second oil-insulating film 502 is formed inside the oil tank 5, and forms an air-bag structure around the air-vent 53, and the air-bag opening is the air-vent 53.

In the present utility model, the ventilation port 53 is provided to supplement a part of air during the replacement of the sea water and crude oil, so as to adjust the average density of the whole oil storage tank 5 to be equivalent to the sea water density, thereby reducing the burden of the second elevating mechanism 6. When crude oil is unloaded, air is continuously introduced, so that the oil storage tank 5 is continuously lifted, and the height difference between the oil storage tank 5 and the oil tanker is reduced.

Similarly, the air pump 91 is disposed on the support 4, and the air pump 91 is always located above the water surface by setting the height of the support 4, and the air pump 91 is connected to the air vent 53 through a hose.

According to one embodiment of the utility model, the tank 5 is provided with a counterweight which is sized such that the average density of the tank 5 differs from the sea water density by less than 1% when the tank 5 is full of crude oil.

The function of the balancing weight is to provide a balancing weight, so that the average density of the integral oil storage tank 5 is basically equal to that of the sea water when the integral oil storage tank is full of crude oil, and the integral oil storage tank can float on the water surface through the buoyancy of the integral oil storage tank. In this way, when unloading crude oil, the oil storage tank 5 is located on the water surface, and the burden on the second elevating mechanism 6 can be reduced. The balancing weight can be arranged independently, and can be arranged as a double-layer shell when the shell of the oil storage tank is arranged, and the interlayer of the double-layer shell is provided with proper weight.

According to one embodiment of the utility model, a fixedly welded or detachable connection is provided between the support 4 and the oil reservoir 5.

The support 4 may be provided separately from the tank 5 or may be part of the tank 5, for example, extending directly upwards from the tank 5 as a columnar structure. When the bracket 4 is provided separately from the oil tank 5, it is necessary to maintain a fixed connection therebetween during operation. When the detachable connection is adopted, different liquid storage tanks can be replaced according to the needs.

According to one embodiment of the utility model, racks are arranged on the upright 2, and gears meshed with the racks are arranged on the first lifting mechanism 3 and the second lifting mechanism 6 and driven by a motor or an oil cylinder.

The lifting transmission structure between the upright post 2 and the first lifting mechanism 3 and the lifting transmission structure between the upright post and the second lifting mechanism 6 can adopt a meshing structure between a gear and a rack, and also can adopt a steel rope hoisting structure.

Fig. 5 shows a schematic view of a work platform comprising a stop block.

As shown in fig. 5, a limiting block 21 is disposed on the upright 2, and the limiting block 21 is disposed below the support 4 and is used for bearing the support 4 when the support 4 descends to the lowest point.

The limiting block 21 is arranged at the lowest point of allowing the oil storage tank 5 or the bracket 4 to descend, and when the oil storage tank 5 or the bracket 4 descends to the lowest point, the limiting block 21 bears the weight of the bracket 4 and the oil storage tank 5, so that the protection of the second lifting mechanism 6 can be formed.

According to one embodiment of the utility model, the tank 5 is provided with a through hole through which the upright 2 is arranged.

Set up the through-hole on oil storage tank 5, the cover is established on stand 2, can increase the stability between oil storage tank 5 and the stand 2, when adjusting oil storage tank 5 below the surface of water, can play the stabilization effect to stand 2.

According to the utility model, the lifting oil storage tank is arranged, so that the power requirement of crude oil unloading operation on the pump can be reduced, and disturbance of water surface waves on the oil storage tank can be avoided. By arranging the structure of the crude oil and seawater replacement system, the oil storage tank is protected from larger pressure difference. Through the structure that sets up the air vent, realize the regulation of oil storage tank average density, reduce second elevating system's burden. The oil storage tank is enabled to float on the water surface through buoyancy by arranging the balancing weight, and the burden on the second lifting mechanism is reduced when crude oil is unloaded. And the second lifting mechanism is protected by arranging a limiting block.

The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification and claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present specification and claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and are therefore to cover all equivalents or alternatives falling within the scope of these claims.

Claims (9)

1. A self-elevating oil storage system based on an ocean drilling and oil production platform is characterized by comprising a platform main body (1), an upright post (2), a first elevating mechanism (3), a bracket (4), an oil storage tank (5) and a second elevating mechanism (6),

the platform main body (1) is erected on the upright post (2);

the first lifting mechanism (3) is arranged on the platform main body (1), connected with the upright post (2) and used for driving the platform main body (1) to lift relative to the upright post (2);

the support (4) is erected on the upright post (2) and is used for bearing the oil storage tank (5) and positioned below the platform main body (1);

the second lifting mechanism (6) is arranged on the support (4), connected with the upright post (2) and used for driving the support (4) to lift relative to the upright post (2).

2. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the support (4) comprises a bearing part (41) and a lifting part (42), the bearing part (41) bears the oil storage tank (5), and the lifting part (42) extends vertically and is connected with the second lifting mechanism (6).

3. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the oil storage tank (5) is provided with an oil port (51) and a seawater port (52);

the oil port (51) is connected with an oil pipeline (7) provided with an oil pump (71);

the seawater port (52) is connected with a seawater pipeline (8) provided with a water pump (81);

a first oil isolation film (501) for separating an oil port (51) from a seawater port (52) is arranged in the oil storage tank (5);

the first oil-insulating film (501) is an elastic film and is sized to fully load the oil storage tank (5) with crude oil or seawater.

4. A jack-up oil storage system based on a marine drilling and production platform as claimed in claim 3, wherein,

the oil pump (71) is arranged on the bracket (4), and the water pump (81) is arranged on the shell of the oil storage tank (5).

5. A jack-up oil storage system based on a marine drilling and production platform as claimed in claim 3, wherein,

the oil storage tank (5) is also provided with a vent (53);

the air vent (53) is connected with an air pipeline (9);

an air pump (91) is arranged on the air pipeline (9);

the oil storage tank (5) is internally provided with a second oil-insulating film (502), and the second oil-insulating film (502) is arranged around the air vent (53).

6. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the oil storage tank (5) is provided with a balancing weight, and the size of the balancing weight is set so that when the oil storage tank (5) is full of crude oil, the difference between the average density of the oil storage tank (5) and the density of seawater is less than 1%.

7. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the bracket (4) is fixedly welded or detachably connected with the oil storage tank (5).

8. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the vertical column (2) is provided with a rack, and the first lifting mechanism (3) and the second lifting mechanism (6) are provided with gears meshed with the rack and driven by a motor or an oil cylinder.

9. The self-elevating oil storage system based on marine drilling and production platform as claimed in claim 1, wherein,

the stand (2) is provided with a limiting block (21), and the limiting block (21) is arranged below the support (4) and used for bearing the support (4) when the support (4) descends to the lowest point.