Ship capable of simultaneously producing offshore crude oil and sealing carbon dioxide

Abstract

A ship capable of simultaneously producing crude oil and sealing carbon dioxide at sea is characterized in that a liquid carbon dioxide receiving module, a liquid carbon dioxide pumping module, a liquid carbon dioxide heating module, a gas-liquid mixed carbon dioxide pressurizing module and a supercritical carbon dioxide injection module are arranged above a main deck of a ship body; a plurality of crude oil storage cabins and a plurality of liquid carbon dioxide storage cabins are arranged below a main deck of the ship body and are alternately arranged in the length direction and the width direction of the ship body. A living building is arranged on a main deck at the tail of the ship body, a crude oil output device and a crude oil metering pry are arranged behind the living building, and the crude oil output device is connected with a conveying device of a crude oil ship. Crude oil extraction and carbon sequestration are synchronously carried out, seabed oil wells and related pipelines are utilized to the maximum degree, and the economical efficiency of offshore carbon sequestration operation is improved. The risk caused by secondary drilling of the abandoned oil well is avoided, and the safety of offshore carbon sequestration operation is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of offshore ship design and construction, and particularly relates to a ship capable of simultaneously carrying out offshore crude oil production and carbon dioxide storage. BACKGROUND

[0002] Offshore carbon storage has the following advantages: the sealing property and safety are higher due to the seawater pressure and the barrier of the rock cap; the application potential is great due to the wide distribution of seabed reservoirs that can be used for carbon storage; it is easy to select a storage site; the seabed storage is far away from fresh water storage and human settlements, and has less local risk and more environmental friendliness; and the comprehensive cost of geological survey and drilling and mining can be greatly reduced by using offshore abandoned oil fields for carbon storage.

[0003] China's first offshore carbon storage demonstration project has been officially put into use in June this year, and will store 300,000 tons of carbon dioxide annually. However, the project collects and stores the associated carbon dioxide generated during natural gas extraction, only solving its own carbon emission problem and cannot perform additional carbon storage work.

[0004] At present, the research on offshore CCUS focuses more on the process method of carbon storage. Patent CN219655826U discloses a same-well injection and extraction system for storing carbon dioxide in a seabed saltwater layer; and patent CN114278257A discloses a synchronous device and method for offshore oilfield exploitation and supercritical carbon dioxide storage, both of which are innovations in the CCUS process.

[0005] However, the research on offshore CCUS equipment is still in its early stages. Patent CN116480934A discloses a floating offshore carbon dioxide storage and methanol production equipment, which mentions storing carbon dioxide in old oil fields, but does not mention how to open the old oil fields that have been abandoned.

[0006] In order to store carbon dioxide in offshore old oil fields, it is necessary to drill new wells in offshore old oil fields that have been abandoned, which greatly increases the cost of carbon storage. At the same time, the pressure, composition, and geology of old oil fields are all unstable, and reopening old oil wells may cause accidents such as wellhead collapse or well liquid (gas) eruption.

[0007] The most safe and ideal way of offshore carbon dioxide storage is to simultaneously carry out offshore oil and gas exploitation and carbon dioxide storage, that is, to carry out the two operations in a complementary and synchronous mode. However, there is no patent that discloses a floating device for such an operation mode. SUMMARY

[0008] To solve the above problems, the present application provides a ship capable of simultaneously carrying out offshore crude oil production and carbon dioxide storage, which adopts the following technical solution:

[0009] A ship for offshore crude oil production and carbon dioxide storage simultaneously, a plurality of modules are arranged above the main deck of the ship body, a plurality of crude oil storage cabins and a plurality of liquid carbon dioxide storage cabins are arranged below the main deck of the ship body, and the plurality of crude oil storage cabins and the plurality of liquid carbon dioxide storage cabins are arranged alternately along the length and width directions of the ship body.

[0010] The crude oil extraction module collects crude oil in the seabed oil well through the crude oil pipeline of the offshore riser and sends it to the crude oil separation module. When the pressure in the seabed oil well is insufficient, the crude oil extraction module injects supercritical carbon dioxide into the well to increase the pressure in the well. The crude oil separation module performs preliminary physical separation on the extracted crude oil, and sends the physically separated crude oil to the crude oil purification module. The crude oil purification module injects chemical reagents into the crude oil to remove harmful liquid impurities in the crude oil, thereby obtaining qualified crude oil which is sent to the crude oil detection and distribution module. The crude oil that passes the detection of the crude oil detection and distribution module enters the crude oil storage cabin, and the unqualified crude oil returns to the crude oil purification module for further purification. After the extraction of a certain oil well is completed, the oil well will be used as a carbon dioxide storage well.

[0011] The liquid carbon dioxide receiving module receives the liquid carbon dioxide transported by the liquid carbon dioxide transport ship through the liquid carbon dioxide pump. After receiving, the liquid carbon dioxide is first subjected to pressurization treatment and pressurized to 12 MPa. After pressurization, the liquid carbon dioxide is distributed to each liquid carbon dioxide storage cabin through pipe valve control. The liquid carbon dioxide pumping module is connected to the liquid carbon dioxide storage cabin, pumps the liquid carbon dioxide out of the liquid carbon dioxide storage cabin, pressurizes it to 12 MPa, and then sends it to the liquid carbon dioxide heating module for heating to 31.26℃. While heating in the liquid carbon dioxide heating module, the pressure is reduced to 8 MPa. At this time, the state of carbon dioxide is gas-liquid mixture. The gas-liquid mixed carbon dioxide is sent to the gas-liquid mixed carbon dioxide pressurization module for pressurization and heating operation, so that the carbon dioxide pressure reaches 20 MPa and the temperature reaches 60℃, forming supercritical carbon dioxide, which is then sent to the supercritical carbon dioxide injection module. The supercritical carbon dioxide injection module distributes the supercritical carbon dioxide and injects it into the seabed carbon dioxide storage well.

[0012] The above-mentioned ship for offshore crude oil production and carbon dioxide storage simultaneously is further provided with a crude oil extraction module, a crude oil separation module, a crude oil purification module, a crude oil detection and distribution module, and a crude oil manifold valve group module arranged above the main deck and sequentially connected and arranged along the length direction of the ship body.

[0013] The liquid carbon dioxide receiving module, the liquid carbon dioxide pumping module, the liquid carbon dioxide heating module, the gas-liquid mixed carbon dioxide pressurization module, and the supercritical carbon dioxide injection module are arranged above the main deck and sequentially connected and arranged along the length direction of the ship body.

[0014] The stern main deck of the hull is provided with a living tower, the bow main deck of the hull is provided with a bow tower, and the rear of the living tower is provided with a crude oil output device and a crude oil metering pry.

[0015] A generator module is arranged between the living tower and the crude oil extraction module and between the living tower and the liquid carbon dioxide receiving module.

[0016] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that qualified crude oil is sub-packed into each carbon dioxide storage cabin through the crude oil manifold valve group.

[0017] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the crude oil separation module separates associated gas in crude oil by means of standing and sedimentation, re-injects toxic gas and carbon dioxide in the associated gas back into an oil well, and combusts or stores non-toxic gas in the associated gas as fuel.

[0018] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the stern of the hull is provided with a liquid carbon dioxide input device, and the liquid carbon dioxide receiving module is connected with unloading devices of a berthed carbon dioxide transport ship through the liquid carbon dioxide input device.

[0019] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the chemical reagent in the crude oil purification module is.

[0020] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the combustible non-toxic gas in the associated gas is natural gas.

[0021] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the liquid carbon dioxide storage cabin is a pressure cabin, the pressure in the cabin cannot be less than 7.3 MPa at any time, and is 10 MPa in a normal state.

[0022] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that pipelines and valves for liquid carbon dioxide to enter or exit the liquid carbon dioxide storage cabin are arranged on the main deck, and the outer surfaces of the pipelines and the valves are wrapped with a thermal insulation layer.

[0023] The offshore crude oil production and carbon dioxide storage simultaneous ship further comprises that the temperature of the liquid carbon dioxide in the pipelines and the valves cannot be increased by more than 0.3℃.

[0024] The offshore crude oil production and carbon dioxide storage simultaneous ship further has a ship cabin inside below the main deck, and a marine bow machine room is arranged at the bow of the ship, and a marine stern machine room is arranged at the stern of the ship.

[0025] The beneficial effects of the present application are:

[0026] 1. The crude oil exploitation and carbon storage are simultaneously carried out, the submarine oil well and related pipelines are maximized, and the economy of offshore carbon storage operation is improved.

[0027] 2. The risk of secondary drilling of abandoned oil wells is avoided, and the safety of offshore carbon storage operation is improved.

[0028] 3. In the crude oil exploitation process, the oil field can be pressurized by injecting carbon dioxide into the oil field, the carbon dioxide injection is assisted by the crude oil exploitation, the crude oil exploitation operation and the carbon dioxide injection operation are complementary, and the economy of the whole device is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the upper part of the main deck of the present application;

[0030] Figure 2 is a schematic view of the lower part of the main deck of the present application;

[0031] Figure 3 is a schematic view of the present application;

[0032] Figure 4 is a flow chart of the present application;

[0033] Wherein: 111 is a crude oil storage cabin, 121 is a crude oil output device, 122 is a crude oil metering pry, 13 is a crude oil exploitation module, 14 is a crude oil separation module, 15 is a crude oil purification module, 16 is a crude oil detection and shunting module, 17 is a crude oil manifold valve group module, 211 is a liquid carbon dioxide storage cabin, 221 is a liquid carbon dioxide input device, 222 is a liquid carbon dioxide metering pry, 23 is a liquid carbon dioxide receiving module, 24 is a liquid carbon dioxide pumping module, 25 is a liquid carbon dioxide heating module, 26 is a gas-liquid mixed carbon dioxide pressurizing module, 27 is a supercritical carbon dioxide injection module, 311 is a ballast cabin, 321 is a marine stern machine room, 322 is a marine bow machine room, 331 is a multi-point mooring device, 34 is a living tower, 35 is a bow tower, 361 is a generator module, 37 is an overboard standpipe, A is a main deck, and B is a ship body. DETAILED DESCRIPTION

[0034] The present application is further described in conjunction with the drawings.

[0035] A ship capable of simultaneously carrying out offshore crude oil production and carbon dioxide storage, as shown in the drawings Figures 1-3 As shown in the drawings, a plurality of modules are arranged above the main deck of the hull, a plurality of crude oil storage cabins and a plurality of liquid carbon dioxide storage cabins are arranged below the main deck of the hull, and the plurality of crude oil storage cabins and the plurality of liquid carbon dioxide storage cabins are arranged alternately along the length and width directions of the hull.

[0036] The crude oil production module, the crude oil separation module, the crude oil purification module, the crude oil detection and shunting module, and the crude oil manifold valve group module are arranged above the main deck and sequentially connected and arranged along the length direction of the hull. The liquid carbon dioxide receiving module, the liquid carbon dioxide pumping module, the liquid carbon dioxide heating module, the gas-liquid mixed carbon dioxide pressurizing module, and the supercritical carbon dioxide injection module are arranged above the main deck and sequentially connected and arranged along the length direction of the hull. A living tower is arranged on the tail main deck of the hull, a bow tower is arranged on the head main deck of the hull, a crude oil output device and a crude oil metering pry are arranged behind the living tower, the crude oil output device is connected with the conveying device of the crude oil ship, a generator module is arranged between the living tower and the crude oil production module and between the living tower and the liquid carbon dioxide receiving module, ballast tanks are arranged on both sides of the ship, and multi-point anchoring devices are arranged on the sides of the head and tail ends of the ship.

[0037] The ship has the functions of offshore crude oil production, storage, and transportation, and also has the functions of offshore liquid carbon dioxide receiving and storage. While each oil well is being extracted one by one, supercritical carbon dioxide is injected into the well according to the degree of crude oil extraction in the well, thereby achieving permanent storage of carbon dioxide in offshore oil and gas fields.

[0038] The crude oil storage cabin is arranged in the hull and is arranged alternately with the liquid carbon dioxide storage cabin. The pipelines and valves for the entry and exit of crude oil into and out of the crude oil storage cabin are arranged on the deck, and the pump is arranged in the cabin and uses a deep-sea pump. The pipelines and valves for the entry and exit of liquid carbon dioxide into and out of the liquid carbon dioxide storage cabin are arranged on the deck and are wrapped with an insulating layer to keep the temperature rise of the liquid carbon dioxide in the pipelines within a controllable range, and the temperature rise should not exceed 0.3℃. The pump is arranged in the cabin and uses a low-temperature deep-sea pump.

[0039] As shown in the drawings Figure 4 During the process of continuously entering crude oil from the oil field into the crude oil storage cabin in the hull and continuously injecting carbon dioxide from the carbon dioxide storage cabin in the hull into the oil well, the operation mode of entering and exiting ensures that the weight balance of the hull is guaranteed to the maximum extent, and a large lateral inclination does not occur.

[0040] Each crude oil storage cabin is provided with a dedicated oil pump for pumping crude oil to the crude oil output device through the crude oil metering pry. The oil pump is a deep-sea pump, which is controlled by the central control system. The flow rate of the oil pump not only needs to consider the output of the crude oil, but also needs to consider the sealing rate of the liquid carbon dioxide, so as to ensure that the weight of the output crude oil and the liquid carbon dioxide injected into the sealing well is the same, and to avoid the inclination of the platform.

[0041] The crude oil output device is located at the tail of the hull. The crude oil in the crude oil storage cabin is pumped to the crude oil output device, and then unloaded to the crude oil tanker by the crude oil output device. The crude oil output device is provided with a hose with a length not less than 200 m for connecting the ship and the crude oil receiving ship.

[0042] The crude oil metering pry is located between the crude oil output device and the crude oil storage cabin, and is used for metering the amount of crude oil unloaded to the crude oil tanker through the crude oil output device, so as to meter and charge.

[0043] The crude oil production module is responsible for the production of crude oil. The crude oil in the subsea well is collected to the device through the overboard riser pipeline. When the pressure in the well is insufficient, the crude oil production module needs to inject chemicals into the well to increase the pressure in the well. The chemicals are mainly supercritical carbon dioxide, and the selection of the medium injected into the well is realized through different medium pipelines and control valves in the crude oil production module.

[0044] Further, the crude oil production module can control the production progress of different wells according to the conditions of the oil wells corresponding to different crude oil pipelines. When the production of one of the wells is completed, the well will be used as a carbon dioxide sealing well. The valve is opened and closed to control the oil pipeline to be closed, the chemical injection pipeline is kept open to balance the pressure, and the carbon dioxide injection pipeline starts to inject a large amount of supercritical carbon dioxide into the well for sealing.

[0045] The crude oil separation module preliminarily physically separates the crude oil produced by the crude oil production module. The associated gas in the oil is first separated by standing and sedimentation, and then the toxic gas and carbon dioxide in the associated gas are re-injected into the well. The non-toxic gas, which can be combusted (such as natural gas, etc.), is combusted or stored as fuel, and the non-combustible gas (such as nitrogen, etc.) is vented. The separated liquid crude oil enters the crude oil purification module.

[0046] The crude oil purification module receives the crude oil provided by the crude oil separation module and the unqualified crude oil screened out by the crude oil detection and shunting module, and performs impurity removal and purification operation on the crude oil. By adding chemical reagents, harmful liquid impurities in the crude oil are removed, so as to obtain qualified crude oil.

[0047] The crude oil detection and shunting module is responsible for detecting the crude oil delivered by the crude oil purification module, delivering qualified crude oil to the crude oil manifold valve group module, and returning unqualified crude oil to the crude oil purification module for re-purification.

[0048] The crude oil manifold valve group module receives qualified crude oil provided by the crude oil detection and shunting module, and shunts it to each crude oil storage cabin according to the actual situation. The shunting principle first considers filling a certain crude oil storage cabin as much as possible to avoid the situation of crude oil sloshing in the crude oil storage cabin, and then considers the head-tail weight distribution, which requires alternating oil injection to the head-tail crude oil storage cabin in the order of crude oil storage cabin, crude oil storage cabin, crude oil storage cabin, crude oil storage cabin, crude oil storage cabin, and crude oil storage cabin.

[0049] The liquid carbon dioxide storage cabin is located in the ship body and is arranged in a left-right cross manner with the crude oil storage cabin. During the process of continuously outputting liquid carbon dioxide from the liquid carbon dioxide storage cabin and continuously inputting crude oil into the crude oil storage cabin, this cross arrangement can basically ensure the weight balance of the ship body and prevent large lateral tilting.

[0050] The liquid carbon dioxide storage cabin is a pressure cabin, and the pressure in the cabin should not be less than 7.3 MPa at any time, and should be maintained at about 10 MPa under normal conditions.

[0051] The liquid carbon dioxide input device can be connected with the unloading device of the berthed carbon dioxide transport ship to receive the liquid carbon dioxide transported by the liquid carbon dioxide transport ship and pump the liquid carbon dioxide to the liquid carbon dioxide receiving module.

[0052] The liquid carbon dioxide metering pry is located between the liquid carbon dioxide input device and the liquid carbon dioxide receiving module, and is used to meter the received liquid carbon dioxide and serve as the basis for charging for sealing these carbon dioxide.

[0053] The liquid carbon dioxide receiving module receives the liquid carbon dioxide provided by the liquid carbon dioxide input device and metered by the liquid carbon dioxide metering pry. After receiving, the liquid carbon dioxide is first subjected to pressurization treatment to 12 MPa, thereby making up for the pressure loss of the liquid carbon dioxide in the pipeline, providing a margin for the pressure loss of the pipeline during the process of the liquid carbon dioxide from the liquid carbon dioxide receiving module to the liquid carbon dioxide storage cabin, and ensuring that the carbon dioxide remains in a liquid state without gasification when entering the liquid carbon dioxide storage cabin.

[0054] The liquid carbon dioxide receiving module controls the distribution of liquid carbon dioxide in each liquid carbon dioxide storage tank through the pipe valve. When filling the liquid carbon dioxide into the liquid carbon dioxide storage tank, the single tank should be filled first to avoid the liquid carbon dioxide sloshing phenomenon in the liquid carbon dioxide storage tank. Then the head and tail liquid carbon dioxide are filled alternately to balance the weight distribution of the head and tail. The sequence is liquid carbon dioxide storage tank, liquid carbon dioxide storage tank, liquid carbon dioxide storage tank, liquid carbon dioxide storage tank, liquid carbon dioxide storage tank, liquid carbon dioxide storage tank.

[0055] The liquid carbon dioxide pumping module is connected with the liquid carbon dioxide storage tank, pumps out the liquid carbon dioxide from the liquid carbon dioxide storage tank, and pressurizes it to 12 MPa to make up for the pressure loss of the pipeline and valve, and at the same time to ensure that the liquid carbon dioxide will not gasify due to pressure drop in the subsequent pipeline transportation. The liquid carbon dioxide pumping module delivers the liquid carbon dioxide to the liquid carbon dioxide heating module.

[0056] The liquid carbon dioxide heating module receives the liquid carbon dioxide from the liquid carbon dioxide pumping module, and performs heating operation on the liquid carbon dioxide, so that the liquid carbon dioxide in the pipeline reaches the temperature requirement of supercritical carbon dioxide, which is 31.26℃. This temperature is also the highest temperature at which carbon dioxide can remain liquid under a pressure of 12 MPa. The heating operation is realized by heating resistance wires wound outside the pipeline, which should be uniformly arranged to avoid local overheating. During the heating process, a small amount of liquid carbon dioxide will inevitably gasify, so the carbon dioxide is in a gas-liquid mixed state at this stage. While heating, the liquid carbon dioxide heating module performs pressure reduction operation to ensure that the carbon dioxide pressure does not increase due to heating, and finally makes the carbon dioxide pressure uniformly reduce to 8 MPa. The carbon dioxide from the outlet of the liquid carbon dioxide module is in a gas-liquid mixed state, with a temperature of 31.26℃ and a pressure of 8 MPa.

[0057] The gas-liquid mixed carbon dioxide pressurizing module receives the gas-liquid mixed carbon dioxide from the liquid carbon dioxide heating module, and performs pressurization operation to make the carbon dioxide pressure reach 20 MPa, and at the same time performs heating to make the carbon dioxide temperature reach 60℃. At this time, the carbon dioxide enters the supercritical state between the gaseous and liquid states.

[0058] The supercritical carbon dioxide injection module receives the supercritical carbon dioxide from the gas-liquid mixed carbon dioxide pressurizing module, and distributes the supercritical carbon dioxide through the operation of the pipeline and valve, and injects it into the subsea oil well. It can be injected into the oil well being developed as a recovery aid to balance the pressure in the well and provide assistance for oil production. It can also be injected into the oil well that has been developed.

[0059] The ballast tanks are used for adjusting the floating state of the device, and the number thereof should be as few as possible to reduce the use of pipeline valves and bulkheads and to reduce the weight of the empty ship under the condition that the floating state of the ship under various working conditions is adjusted. The ship stern machinery house is internally provided with a ship generator cabin, a pump cabin, an air conditioner room, a fan room, a machine repair room, an auxiliary equipment room, a fire pump room and the like, which provide the device with auxiliary functions such as power supply, ventilation, power supply and fire fighting; the ship bow machinery house is internally provided with a fire pump room and a warehouse, which provide the device with auxiliary functions such as fire fighting; the multi-point anchoring device includes an anchor chain lifting device, a chain stopper and a chain guide, and anchors the device at a fixed position; the living building provides personnel accommodation and supporting facilities such as a dining room, a kitchen and a laundry room; the generator module has two, which respectively provide power supply services for the crude oil production and storage related module and the carbon dioxide storage related module; the offshore riser is located on one side of the device, and the number thereof is determined according to the number of subsea wellheads, and the principle is that there are at least three risers for each oil well, which are a crude oil production pipe, a chemical injection pipe and a supercritical carbon dioxide injection pipe, in addition to a umbilical protection pipe for power supply of subsea related equipment, usually not less than 60. After the riser is connected, the crude oil production operation starts, and the carbon dioxide storage operation can be carried out simultaneously with the crude oil production operation.

Claims

1. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration, characterized in that, The hull main deck is provided with a plurality of modules above the hull main deck, a plurality of crude oil storage cabins and a plurality of liquid carbon dioxide storage cabins below the hull main deck, and the plurality of crude oil storage cabins and the plurality of liquid carbon dioxide storage cabins are arranged alternately along the length and width directions of the hull; The hull main deck is provided with a crude oil extraction module, a crude oil separation module, a crude oil purification module, a crude oil detection and shunting module, and a crude oil manifold valve group module arranged above the main deck and sequentially connected and arranged along the length direction of the hull; The hull main deck is provided with a liquid carbon dioxide receiving module, a liquid carbon dioxide pumping module, a liquid carbon dioxide heating module, a gas-liquid mixed carbon dioxide pressurizing module, and a supercritical carbon dioxide injection module arranged above the main deck and sequentially connected and arranged along the length direction of the hull; The hull tail main deck is provided with a living tower, and the hull bow main deck is provided with a bow tower, and the rear of the living tower is provided with a crude oil output device and a crude oil metering pry, and the crude oil output device is connected with the conveying device of the crude oil tanker. A generator module is arranged between the living tower and the crude oil extraction module and between the living tower and the liquid carbon dioxide receiving module, and a ballast tank is arranged on both sides of the ship, and a multiple anchor mooring device is arranged on the bow and tail ends of the ship.

2. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration according to claim 1, characterized in that The hull tail is provided with a liquid carbon dioxide input device, and the liquid carbon dioxide receiving module is connected with the unloading device of the berthed carbon dioxide transport ship through the liquid carbon dioxide input device.

3. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration according to claim 1, characterized in that, The pipeline and valve for liquid carbon dioxide to enter and exit the liquid carbon dioxide storage cabin are arranged on the main deck, and the outer surface of the pipeline and valve is wrapped with a thermal insulation layer.

4. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration according to claim 1, characterized in that, The liquid carbon dioxide storage cabin is a pressure cabin, and the pressure in the cabin at any time cannot be less than 7.3 MPa, and under normal conditions, the pressure is 10 MPa.

5. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration according to claim 3, characterized in that, The temperature of the liquid carbon dioxide in the pipeline and valve cannot be increased by more than 0.3℃.

6. A vessel for simultaneous offshore crude oil production and carbon dioxide sequestration according to claim 1, characterized in that, Inside the cabin below the main deck, the bow of the ship is provided with a marine bow machine room, and the tail of the ship is provided with a marine stern machine room.

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