Liquid carbon dioxide offshore jacket type injection and storage method

Abstract

The invention discloses a liquid carbon dioxide offshore jacket type injection and storage method. The liquid carbon dioxide offshore jacket type injection and storage method comprises the steps that S1, carbon dioxide captured by an industrial emission source is purified; s2, pressurizing and cooling the purified carbon dioxide to convert the carbon dioxide into liquid carbon dioxide; s3, the liquid carbon dioxide is conveyed to the offshore jacket platform through a transport ship, and the liquid carbon dioxide is stored in the offshore jacket platform; s4, pressurizing the liquid carbon dioxide to enable the pressure of the liquid carbon dioxide to be increased to 30-100 MPa; s5, the pressurized liquid carbon dioxide is stably injected into the seabed deep reservoir, so that the carbon dioxide is sealed and stored in the seabed deep reservoir; and S6, full-period monitoring is carried out on the sealed and stored products, and the leakage risk is early warned in advance. The liquid carbon dioxide offshore jacket type injection and storage method has the advantages of being simple in step, high in transportation efficiency and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide, in particular to a liquid carbon dioxide offshore jacket type injection and storage method. BACKGROUND

[0002] The liquid carbon dioxide offshore jacket type injection and storage technology is a key technology for long-term storage of captured carbon dioxide by processing and transporting it to offshore platforms, injecting it into suitable geological reservoirs in deep seabed, such as saline aquifers, depleted oil and gas reservoirs, etc., through the injection system supported by the jacket, and is one of the mainstream solutions in the field of marine carbon storage.

[0003] In related technologies, the liquid carbon dioxide offshore jacket type injection and storage system is not reasonably arranged, the transportation pipeline is prone to blockage, the low-pressure liquid carbon dioxide storage tank is located at the top of the jacket, and is affected by waves and wind for a long time, the storage tank shakes greatly, which seriously affects the stability of the storage tank. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, an embodiment of the present application proposes a liquid carbon dioxide offshore jacket type injection and storage method with simple structure, simple steps and long service life.

[0006] The liquid carbon dioxide offshore jacket type injection and storage method according to the embodiment of the present application comprises: S1: capturing carbon dioxide from an industrial emission source, removing heavy impurities in the carbon dioxide through low-temperature rectification, and then separating and purifying the carbon dioxide through a nano membrane, while introducing microwave-assisted molecular sieve adsorption in the dehydration link to reduce the water content of the carbon dioxide; S2: pressurizing and cooling the purified carbon dioxide to convert it into liquid carbon dioxide; S3: using a transport ship to transport the liquid carbon dioxide to an offshore jacket platform and storing the liquid carbon dioxide on the offshore jacket platform; S4: pressurizing the liquid carbon dioxide to increase the pressure of the liquid carbon dioxide to 30MPa-100MPa;

[0007] S5: injecting the pressurized liquid carbon dioxide into a stable injection seabed deep reservoir, so that the carbon dioxide is stored in the seabed deep reservoir; S6: monitoring the whole cycle after storage and early warning of leakage risk.

[0008] The liquid carbon dioxide offshore jacket type injection and storage method according to the embodiment of the present application, through steps S1-S6, adopts low-temperature rectification, nano membrane and microwave-assisted molecular sieve adsorption technologies, improves the purity of carbon dioxide, reduces the water content, prevents the transportation pipeline from being blocked, improves the transportation efficiency, and provides important technical support and solutions for the field of marine carbon storage.

[0009] In some embodiments, the offshore jacket platform comprises: a jacket body; a storage member disposed on an upper end of the jacket body, the storage member being adapted to store liquid carbon dioxide transported by the transport ship; a pressurization member disposed on the jacket body and in communication with the storage member, such that the liquid carbon dioxide in the storage member flows into the pressurization member, the pressurization member being used to pressurize the liquid carbon dioxide; and a delivery member disposed on the jacket body and extending in a vertical direction, an upper end of the delivery member being in communication with the pressurization member, and a lower end of the delivery member being adapted to be disposed in a geological reservoir at a deep depth of the seabed, such that the pressurized carbon dioxide is delivered into the geological reservoir through the delivery member.

[0010] In some embodiments, the storage member is a plurality of storage members, the plurality of storage members being disposed on the jacket body and spaced apart along a length direction of the jacket body, each of the storage members comprising: a tank body having a storage cavity, an inner circumferential surface of the storage cavity being cylindrical; a plurality of guard hole disks disposed in the storage cavity and spaced apart along an axial direction of the storage cavity to divide the storage cavity into a plurality of sub-cavities, each of the guard hole disks having a first through hole penetrating through the guard hole disk; and a plurality of adjustment hole disks, at least one of the adjustment hole disks being disposed in each of the sub-cavities, each of the adjustment hole disks being in abutment with the guard hole disk and having a second through hole penetrating through the adjustment hole disk, each of the adjustment hole disks being rotatable within the tank body about an axial direction of the tank body between a first position and a second position, in the first position, at least part of the first through hole and the second through hole being in communication, such that adjacent ones of the sub-cavities are in communication through the first through hole and the second through hole, in the second position, the adjustment hole disk blocks the first through hole and the second through hole, such that adjacent ones of the adjustment hole disks are disconnected from each other.

[0011] In some embodiments, the storage member further comprises a first driving device disposed in the tank body, the first driving device comprising: a transmission box disposed in the tank body; an electric motor disposed in the transmission box; a rotating shaft penetrating through the transmission box and extending along an axial direction of the transmission box, one end of the rotating shaft being connected to the electric motor, such that the electric motor drives the rotating shaft to rotate, each of the adjustment hole disks penetrating through the rotating shaft, such that the electric motor drives the adjustment hole disks to rotate between the first position and the second position through the rotating shaft.

[0012] In some embodiments, the transmission box and the rotating shaft are sealed by a sealing ring.

[0013] In some embodiments, the first driving device further comprises a pair of first and second gears meshing with each other, the first gear being connected with the motor, the diameter of the first gear being smaller than that of the second gear; a first shaft and a second shaft, both of which are rotatably arranged in the transmission box, the first shaft and the second shaft being axially spaced apart along the transmission box, the second gear being connected with the first shaft so that the second gear drives the first shaft to rotate; a first pulley, a second pulley and a conveying belt, the first pulley being connected with the first shaft, the second pulley being connected with the second shaft, the diameter of the first pulley being smaller than that of the second pulley, the conveying belt being sleeved on the first pulley and the second pulley so that the first shaft drives the second shaft to rotate through the first pulley, the second pulley and the conveying belt; a pair of third and fourth gears meshing with each other, the third gear being connected with the second shaft, the fourth gear being connected with the rotating shaft so that the second shaft drives the rotating shaft to rotate through the third and fourth gears.

[0014] In some embodiments, the liquid carbon dioxide offshore jacket injection and storage method further comprises a protective shell arranged on the jacket body and sleeved on the storage member, the protective shell comprising a shell body arranged on the jacket body and a door plate arranged above the shell body to close the shell body, the door plate being rotatable relative to the shell body along the length direction of the jacket body.

[0015] In some embodiments, the liquid carbon dioxide offshore jacket injection and storage method further comprises a second driving device connected with the door plate so that the second driving device drives the door plate to rotate.

[0016] In some embodiments, the booster comprises a plurality of booster pumps connected in series so that the plurality of booster pumps boost the liquid carbon dioxide.

[0017] In some embodiments, in S5, the deep-sea reservoir is intermittently injected with a catalyst solution with a concentration of 0.1%-0.5% synchronously, and a pulse injection method is adopted, pressure pulse is formed by periodically adjusting the injection pressure and flow rate every 2-4 hours to accelerate the diffusion and dissolution of the pressurized carbon dioxide in the reservoir pores. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of an offshore jacket platform according to an embodiment of the present application.

[0019] Figure 2 is a structural schematic diagram of a storage member of an offshore jacket platform according to an embodiment of the present application.

[0020] Figure 3 This is a schematic diagram of the structure of the first drive device of the offshore jacket platform according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the second drive device of the offshore jacket platform according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the protective orifice plate and the adjustment orifice plate of the offshore jacket platform according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the second drive device of the offshore jacket platform according to an embodiment of the present invention.

[0024] Figure 7 This is a flowchart of the liquid carbon dioxide offshore jacketed injection and storage method according to an embodiment of the present invention.

[0025] 100. Liquid carbon dioxide offshore jacket-type injection and storage method;

[0026] 10. Offshore jacket platform;

[0027] 1. Storage component; 11. Tank body; 111. Sub-cavity; 12. Protective perforation plate; 121. First through hole; 13. Adjustment perforation plate; 131. Second through hole; 14. First drive unit; 141. Transmission box; 142. Motor; 143. Rotating shaft; 144. First gear; 145. Second gear; 146. First shaft; 147. Second shaft; 148. First pulley; 149. Second pulley; 150. Conveyor belt; 151. Third gear; 152. Fourth gear; 2. Pressurizing component; 3. Conveying component; 4. Protective shell; 41. Shell; 42. Door panel; 5. Second drive unit; 51. Electric pusher cylinder; 52. Sliding bar; 53. Hinge rod; 54. Transmission rod; 55. Slider; 56. Rack; 57. Pinion; 58. Transmission box; 6. Guide plate; 7. Frame; 8. Guide cylinder. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following describes a liquid carbon dioxide offshore jacketed injection and storage method 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0030] like Figures 1-7 As shown, the liquid carbon dioxide offshore jacketed injection and storage method 100 according to an embodiment of the present invention includes steps S1-S6.

[0031] S1: Purification of carbon dioxide captured from industrial emission sources, first by low-temperature rectification to remove heavy impurities in carbon dioxide, then by nanomembrane separation and purification of carbon dioxide, and simultaneously introducing microwave-assisted molecular sieve adsorption in the dehydration link to reduce the water content of carbon dioxide. Specifically, as shown in Figure 7 , first, the low-temperature rectification treatment is performed on the carbon dioxide captured from the industrial emission sources to remove the heavy impurities therein, and then the nanomembrane technology is used for further separation and purification. The nanomembrane adopts a gradient pore size composite membrane structure, which is composed of a surface layer with a pore size of 5-10 nm, a transition layer with a pore size of 20-50 nm, and a support layer with a pore size of 100-200 nm, to ensure that the carbon dioxide purity is improved to more than 99.95%, and the rejection rate of hydrogen sulfide is ≥99.9%. In the dehydration link, microwave-assisted molecular sieve adsorption technology is introduced to reduce the water content in carbon dioxide to less than 5 ppm. During the purification process, real-time phase simulation technology is used to match the pressure parameters required for subsequent transportation in advance.

[0032] S2: Pressurization and cooling of the purified carbon dioxide to convert it into liquid carbon dioxide. Specifically, as shown in Figure 7 , the purified carbon dioxide is introduced into the supercritical transition zone for phase stabilization treatment. By pressurizing to 5-7 MPa and cooling to -20°C, it is converted into liquid carbon dioxide, ensuring the stability and safety of carbon dioxide during subsequent transportation and storage.

[0033] S3: Using a transport ship to transport liquid carbon dioxide to an offshore jacket platform 10 and store it in the offshore jacket platform 10. Specifically, as shown in Figure 7 , a dedicated transport ship is used to transport liquid carbon dioxide to a predetermined offshore jacket platform 10. During transportation, the liquid phase of carbon dioxide must be strictly maintained to prevent phase change due to changes in temperature or pressure. The offshore jacket platform 10 is equipped with a special carbon dioxide temporary storage tank for receiving and temporarily storing liquid carbon dioxide.

[0034] S4: Pressurization of liquid carbon dioxide to increase the pressure of liquid carbon dioxide to 30-100 MPa. Specifically, as shown in Figure 7 , the liquid carbon dioxide temporarily stored in the carbon dioxide temporary storage tank is pressurized by a multi-stage plunger type booster pump to increase its pressure to 30-100 MPa, and simultaneously cooled to ensure the stability and flowability of carbon dioxide under high pressure.

[0035] S5: Injecting pressurized liquid carbon dioxide into a deep seabed reservoir to store carbon dioxide in the deep seabed reservoir. Specifically, as shown in Figure 7As shown, the pressurized liquid carbon dioxide is transported to the preset injection well through the injection pipe, and injected into the deep seabed reservoir at a steady flow rate. The reservoir is usually selected from a saline layer or a depleted oil and gas reservoir with suitable geological conditions to ensure long-term stable storage of carbon dioxide.

[0036] S6: Implementing full-cycle monitoring and early warning of leakage risk after sealing. Specifically, as shown in Figure 7 the injection process and subsequent sealing state are monitored throughout the cycle, including downhole parameter monitoring, surface or seabed environment monitoring, and geophysical monitoring. During the monitoring process, a combination of optical fiber sensing network and seismic monitoring is used. The optical fiber sensing network is arranged along the injection well and the reservoir boundary to monitor the diffusion front of carbon dioxide in real time. The three-dimensional time lapse seismic technology is used for periodic acquisition of carbon dioxide distribution images in the reservoir. At the same time, during the injection of liquid carbon dioxide, 0.1%-0.5% of a catalyst solution (containing metal ion chelating agent and pH adjuster) is intermittently injected to promote the diffusion and dissolution of carbon dioxide in the reservoir pores. The full-cycle monitoring system can track the diffusion path of carbon dioxide in real time and provide early warning of leakage risk, with a response speed improved by more than 30% compared to traditional monitoring methods.

[0037] The liquid carbon dioxide offshore jacket injection and sealing method 100 of the embodiment of the present application, through steps S1-S6, uses low-temperature rectification, nanomembrane, and microwave-assisted molecular sieve adsorption technologies to improve the purity of carbon dioxide and reduce the water content. In addition, the pressure parameters are matched in advance to ensure stable and safe transportation and storage in liquid state, prevent transportation pipeline blockage, and improve transportation efficiency. Furthermore, through full-cycle monitoring using a combination of multiple methods, the diffusion path can be tracked in real time, the leakage risk can be warned in advance, the response speed is improved, the efficiency and safety of carbon dioxide sealing are ensured, and important technical support and solutions are provided for the field of marine carbon sealing.

[0038] In some embodiments, the offshore jacket platform 10 includes a frame body 7, a storage member 1, a pressurizing member 2, and a conveying member 3.

[0039] The storage member 1 is arranged at the upper end of the frame body 7, and the storage member 1 is adapted to store liquid carbon dioxide transported by a transport ship. Specifically, as shown in Figure 1 the frame body 7 is made of high-strength steel to withstand the complex forces and moments of the marine environment, including wind waves, ocean currents, tides, and other natural factors. The bottom of the frame body 7 is fixed to the seabed by a pile foundation to provide a stable support foundation. The upper part of the frame body 7 extends above the sea surface to provide installation space for the storage member 1, the pressurizing member 2, and the conveying member 3.

[0040] The storage member 1 is arranged at the upper end of the frame body 7, and is usually made of special steel material with pressure resistance and low-temperature resistance, and is internally provided with a heat preservation layer to reduce heat transfer and maintain the liquid state of the carbon dioxide. The storage member 1 is used for storing liquid carbon dioxide, and can be connected with the docking device and the transport ship to realize the transfer of the liquid carbon dioxide.

[0041] The booster 2 is arranged on the frame body 7 and communicates with the storage member 1, so that the carbon dioxide in the storage member 1 flows into the booster 2. The booster 2 is used for boosting the hydraulic carbon dioxide. Specifically, as shown in Figure 1 , the booster 2 is arranged on the frame body 7, the inlet of the booster 2 communicates with the outlet of the storage member 1, and the liquid carbon dioxide in the storage member 1 flows into the delivery member 3, so that the booster 2 boosts the liquid carbon dioxide flowing out of the storage member 1 to meet the high pressure condition required for injecting the deep seabed reservoir.

[0042] The delivery member 3 is arranged on the frame body 7 and extends in the up-down direction, the upper end of the delivery member 3 communicates with the booster 2, and the lower end of the delivery member 3 is adapted to be arranged in the deep seabed geological reservoir, so that the pressurized carbon dioxide is input into the geological reservoir through the delivery member 3. Specifically, as shown in Figure 1 , the delivery member 3 can be a delivery pipe and extend in the up-down direction, the upper end of the delivery member 3 communicates with the outlet of the booster 2, and the lower end of the delivery member 3 is arranged in the deep seabed geological reservoir, so that the pressurized liquid carbon dioxide is delivered to the designated reservoir through the delivery member 3 to realize the carbon dioxide storage.

[0043] In some embodiments, the storage member 1 is a plurality of storage members 1 arranged on the frame body 7 and spaced apart along the length direction of the frame body 7. The storage member 1 includes a tank body 11, a plurality of protective hole discs 12 and a plurality of adjusting hole discs 13.

[0044] The tank body 11 has a storage cavity, and the inner circumferential surface of the storage cavity is cylindrical. Specifically, as shown in Figure 2 , the tank body 11 is a plurality of tank bodies 11 arranged spaced apart in the left-right direction, and the tank body 11 is internally provided with a storage cavity, and the inner circumferential surface of the storage cavity is designed to be cylindrical.

[0045] The plurality of protective hole discs 12 are arranged in the storage cavity and spaced apart along the axial direction of the storage cavity to divide the storage cavity into a plurality of sub-cavities 111. The protective hole disc 12 has a first through hole 121 penetrating the protective hole disc 12. Specifically, as shown in Figure 2 , Figure 3 , and Figure 5As shown, each tank body 11 is provided with a plurality of protective hole plates 12, the protective hole plates 12 are circular and the outer circumferential surface of the protective hole plates 12 is fixedly connected with the inner circumferential surface of the storage cavity, the plurality of protective hole plates are arranged in the left-right direction to divide the storage cavity into a plurality of sub-cavities 111, the protective hole plates are provided with a plurality of first through holes 121 penetrating the protective hole plates 12 in the inner-outer direction, the plurality of second through holes 131 are arranged in the circumferential direction of the protective hole plates 12.

[0046] Each sub-cavity 111 is provided with at least one adjusting hole plate 13, the adjusting hole plate 13 is attached to the protective hole plate 12 and the adjusting hole plate 13 has a second through hole 131 penetrating the adjusting hole plate 13, the adjusting hole plate 13 is rotatable in the tank body 11 relative to the tank body 11 about the axial direction of the tank body 11 between a first position and a second position, in the first position, at least part of the first through hole 121 and the second through hole 131 are communicated, so that the adjacent sub-cavities 111 are communicated through the first through hole 121 and the second through hole 131, in the second position, the adjusting hole plate 13 blocks the first through hole 121 and the second through hole 131, so that the adjacent adjusting hole plates 13 are disconnected. Specifically, as shown in Figure 2 、 Figure 3 and Figure 5 Each sub-cavity 111 is provided with one adjusting hole plate 13, the adjusting hole plate 13 is arranged on the right side of the protective hole plate 12 and attached to the protective hole plate 12, the adjusting hole plate 13 is provided with a plurality of second through holes 131 penetrating the adjusting hole plate 13 in the left-right direction, the plurality of second through holes 131 are arranged in the circumferential direction of the adjusting hole plate 13, the adjusting hole plate 13 is rotatable in the tank body 11 about the left-right direction between a first position and a second position, in the first position, at least part of the first through hole 121 and the second through hole 131 are communicated, allowing the adjacent sub-cavities 111 to be communicated through the first through hole 121 and the second through hole 131, at this time, the flow resistance of the liquid carbon dioxide between the cavities formed by the protective hole plates 12 is the smallest, the buffering effect is weakened at this time, which is suitable for fast fluid transmission in the stable state of the temporary storage tank. In the second position, the adjusting hole plate 13 blocks the first through hole 121 and the second through hole 131, so that the adjacent sub-cavities 111 are disconnected, at this time, the adjusting hole plate 13 and the protective hole plate 12 form a sealed isolation effect, the buffering effect is the strongest at this time, which can effectively inhibit the liquid impact caused by the shaking. Thus, when the rack body 7 shakes, the adjusting hole plate 13 rotates to the second position and is completely misaligned with the protective hole plate 12, blocking the flow of liquid carbon dioxide and forming an independent liquid cavity to inhibit inertial impact, and also allowing part of the first through hole 121 and the second through hole 131 to be partially communicated, generating a gradient resistance by controlling the hole area of the first through hole 121 and the second through hole 131, consuming the shaking energy, thereby reducing the fluctuation amplitude of the liquid carbon dioxide, ensuring the stability of the tank body 11 and improving the service life of the tank body 11.

[0047] In some embodiments, the storage device 1 further comprises a first driving device 14 arranged in the tank 11, the first driving device 14 comprising a transmission box 141, a motor 142 and a rotating shaft 143.

[0048] The transmission box 141 is arranged in the tank 11. Specifically, as shown in Figure 3 the transmission box 141 is arranged in the tank 11 and connected with the right end surface of the tank 11.

[0049] The motor 142 is arranged in the transmission box 141, the rotating shaft 143 is arranged in the transmission box 141 and extends along the axial direction of the transmission box 141, one end of the rotating shaft 143 is connected with the motor 142 so that the motor 142 drives the rotating shaft 143 to rotate, and a plurality of adjusting hole discs 13 are arranged on the rotating shaft 143 so that the motor 142 drives the adjusting hole discs 13 to rotate between the first position and the second position through the rotating shaft 143. Specifically, as shown in Figure 3 the motor 142 is fixed in the transmission box 141, the rotating shaft 143 extends along the left-right direction and the right end of the rotating shaft 143 is connected with the motor 142, the left end of the rotating shaft 143 is arranged outside the transmission box 141, and a plurality of adjusting hole discs 13 are arranged on the rotating shaft 143, so that the motor 142 drives the adjusting hole discs 13 to rotate in the tank 11 through the rotating shaft 143.

[0050] In some embodiments, the storage device 1 further comprises a sealing ring, the transmission box 141 and the rotating shaft 143 are sealed by the sealing ring. Specifically, the sealing ring is sleeved on the outer circumferential surface of the rotating shaft 143 and filled in the transmission box 141, so that the gap between the transmission box 141 and the rotating shaft 143 is sealed by the sealing ring, and the liquid carbon dioxide in the tank 11 flows into the transmission box 141.

[0051] In some embodiments, the first driving device 14 further comprises a pair of first gear 144 and second gear 145 meshing with each other, a first shaft 146, a second shaft 147, a first pulley 148, a second pulley 149, a conveying belt 150 and a pair of third gear 151 and fourth gear 152 meshing with each other.

[0052] The first gear 144 is connected with the motor 142, and the diameter of the first gear 144 is smaller than the diameter of the second gear 145. Specifically, as shown in Figure 3 the first gear 144 and the second gear 145 can be bevel gears and are primary reduction mechanisms, the first gear 144 is installed on the output shaft of the motor 142, the motor 142 drives the first gear 144 to rotate, the diameter of the first gear 144 is smaller than the diameter of the second gear 145, the rotating speed of the first gear 144 can be greater than the rotating speed of the second gear 145, and the primary reduction and torque increase of power are realized.

[0053] The first shaft 146 and the second shaft 147 are rotatably arranged in the transmission box 141, the first shaft 146 and the second shaft 147 are axially spaced apart along the transmission box 141, the second gear 145 is connected with the first shaft 146, so that the second gear 145 drives the first shaft 146 to rotate. Specifically, as shown in Figure 3 The first shaft 146 and the second shaft 147 are both horizontally extending shafts in the front-rear direction, and the first shaft 146 and the second shaft 147 are rotatably arranged in the transmission box 141 through bearings, and the second gear 145 is mounted on the first shaft 146, so that the first shaft 146 is driven to rotate by the second gear 145.

[0054] The first pulley 148 is connected with the first shaft 146, the second pulley 149 is connected with the second shaft 147, the diameter of the first pulley 148 is smaller than the diameter of the second pulley 149, and the conveying belt 150 is sleeved on the first pulley 148 and the pulley, so that the first shaft 146 drives the second shaft 147 to rotate through the first pulley 148, the second pulley 149 and the conveying belt 150. Specifically, as shown in Figure 3 The first pulley 148 and the second pulley 149 are respectively mounted on the first shaft 146 and the second shaft 147, the conveying belt 150 is sleeved on the first pulley 148 and the second pulley 149 to form a closed transmission loop, the second gear 145 drives the first shaft 146 to rotate, the first shaft 146 drives the first pulley 148 to rotate, the first pulley 148 drives the conveying belt 150 to rotate, the conveying belt 150 drives the second pulley 149 to rotate, and the second pulley 149 drives the second shaft 147 to rotate. The diameter of the first pulley 148 is smaller than the diameter of the second pulley 149, so that the rotation speed of the first shaft 146 is greater than the rotation speed of the second shaft 147.

[0055] The third gear 151 is connected with the second shaft 147, and the fourth gear 152 is connected with the rotating shaft 143, so that the second shaft 147 drives the rotating shaft 143 to rotate through the third gear 151 and the fourth gear 152. The third gear 151 and the fourth gear 152 are bevel gears, the third gear 151 is arranged on the second shaft 147 to rotate synchronously with the second shaft 147, the fourth gear 152 is arranged on the rotating shaft 143 and rotates synchronously with the rotating shaft 143, so as to ensure that the rotating shaft 143 can rotate at a proper speed and torque, thereby driving the adjusting hole disc 13 to accurately rotate between the first position and the second position.

[0056] When the motor 142 is started, the first gear 144 is driven to rotate at a high speed. The first gear 144 is engaged with the second gear 145 with a larger diameter to achieve initial speed reduction and torque increase. The second gear 145 drives the first shaft 146 to rotate, and in turn drives the first pulley 148 to rotate synchronously. The first pulley 148 transmits power to the second pulley 149 with a larger diameter through the conveying belt 150 to achieve further speed reduction and torque increase. The second pulley 149 drives the second shaft 147 to rotate, and the second shaft 147 transmits power to the rotating shaft 143 through the engagement of the third gear 151 and the fourth gear 152. Finally, the rotating shaft 143 drives the adjustment hole disc 13 to rotate accurately between the first position and the second position, achieving flexible control of the flow of liquid carbon dioxide.

[0057] In some embodiments, the offshore jacket injection and storage method 100 of liquid carbon dioxide further comprises a protective shell 4 arranged on the frame 7 and sleeved on the storage element 1, the protective shell 4 comprising a shell body 41 arranged on the frame 7 and a door plate 42 arranged above the shell body 41 to close the shell body 41, the door plate 42 being rotatable relative to the shell body 41 along the length direction of the frame 7. Specifically, as shown in Figure 1 and Figure 4 The shell body 41 is a topless shell body 41 fixed on the frame 7, a plurality of storage elements 1 are arranged in the shell body 41, and the door plate 42 is installed on the upper end surface of the shell body 41 and hinged with the right end of the door plate 42 and the right end of the shell body 41, so that the door plate 42 can be lifted up from the shell body 41 or closed to the shell body 41. Thus, the door plate 42 can be easily opened when the storage element 1 needs to be repaired or maintained, providing sufficient operation space for the staff, and the door plate 42 can be tightly closed in the normal working state, effectively preventing external factors from interfering with or damaging the storage element 1.

[0058] In some embodiments, the offshore jacket injection and storage method 100 of liquid carbon dioxide further comprises a second driving device 5 connected with the door plate 42 to drive the door plate 42 to rotate. Specifically, as shown in Figure 4 The second driving device 5 can be a motor 142 connected with the door plate 42 through a speed reduction mechanism to drive the door plate 42 to rotate.

[0059] It is worth noting that the speed reduction mechanism is not limited in the embodiments of the present application, and can be a gear reducer, a worm reducer, etc.

[0060] In some embodiments, the booster 2 comprises a plurality of booster pumps connected in series to pressurize the liquid carbon dioxide. Specifically, the plurality of booster pumps are arranged in series along the left-right direction on the rack body 7 and are connected in series through the communication pipes. The leftmost booster pump is connected to the tank body 11 storing the liquid carbon dioxide through a pipeline. The tank body 11 is usually maintained at a certain pressure. Under the action of this pressure difference, the liquid carbon dioxide will naturally flow into the leftmost booster pump to provide raw materials for the subsequent pressurization process. The rightmost booster pump is connected to the delivery device 3, so that the high-pressure liquid carbon dioxide after multi-stage pressurization is delivered to the deep seabed reservoir.

[0061] In some embodiments, in S5, a catalyst solution with a concentration of 0.1%-0.5% is intermittently injected into the deep seabed reservoir, and a pulse injection method is adopted. By periodically adjusting the injection pressure and flow rate every 2-4 hours to form pressure pulses, the diffusion and dissolution of pressurized carbon dioxide in the reservoir pores are accelerated. Specifically, for the injection process and subsequent storage state, full-cycle monitoring is performed, including downhole parameter monitoring, surface or seabed environmental monitoring, and geophysical monitoring. While injecting liquid carbon dioxide, a 0.1%-0.5% concentration of catalyst solution containing metal ion chelating agents and pH adjusters is intermittently injected. A pulse injection method is adopted. By periodically adjusting the injection pressure and flow rate, pressure fluctuations are formed to promote the diffusion and dissolution of carbon dioxide in the reservoir pores. The pulse period is 2-4 hours, and the pressure fluctuation amplitude is 5%-10% of the baseline injection pressure to ensure the efficiency of the injection and reduce the risk.

[0062] The full-cycle monitoring adopts a method combining optical fiber sensing network and seismic monitoring. The optical fiber sensing network is arranged along the injection well and the reservoir boundary for real-time monitoring of the carbon dioxide diffusion front. The seismic monitoring adopts three-dimensional time lapse seismic technology to periodically obtain the carbon dioxide distribution image in the reservoir, thereby improving the monitoring effect.

[0063] Reference Figures 1-7 The present embodiment proposes a liquid carbon dioxide offshore jacket injection and storage method 100, comprising the following steps:

[0064] S1: For the carbon dioxide captured from industrial emission sources, first remove heavy impurities by low-temperature rectification, then separate and purify the carbon dioxide to more than 99.95% through nanometer membrane, and simultaneously introduce microwave-assisted molecular sieve adsorption in the dehydration link to reduce the water content to less than 5ppm. During the purification process, real-time phase simulation is used to match the subsequent transportation pressure parameters in advance. The nanometer membrane separation adopts a gradient pore size composite membrane composed of a surface layer with a pore size of 5nm-10nm, a transition layer with a pore size of nm-50nm, and a support layer with a pore size of 100nm-0nm. The rejection rate of hydrogen sulfide is ≥99.9%.

[0065] S2: The purified carbon dioxide is subjected to phase stabilization treatment in the supercritical transition zone, pressurized to 5-7 MPa and cooled to -℃, to convert it into liquid carbon dioxide;

[0066] S3: The liquid carbon dioxide is transported to the liquid carbon dioxide offshore jacket platform 10 by a dedicated transport ship, and the liquid phase of the carbon dioxide is maintained during the transportation process;

[0067] S4: The liquid carbon dioxide offshore jacket platform 10 receives the liquid carbon dioxide, which is filtered, separated and metered, and then temporarily stored;

[0068] S5: The pressure of the liquid carbon dioxide is increased to 30-100 MPa by the pressurizing device 2, and the cooling process is simultaneously performed;

[0069] S6: The high-pressure liquid carbon dioxide is transported to the injection well by the conveying device 3, and injected into the deep reservoir at a stable flow rate;

[0070] S7: The whole cycle of injection and subsequent storage is monitored, including downhole parameter monitoring, surface or seabed environment monitoring, and geophysical monitoring. While injecting liquid carbon dioxide, 0.1%-0.5% of a catalyst solution is intermittently injected, which contains metal ion chelating agents and pH adjusters. The catalyst solution is injected in a pulse mode, and by periodically adjusting the injection pressure and flow rate, pressure fluctuations are formed to promote the diffusion and dissolution of carbon dioxide in the reservoir pores. The pulse cycle is 2-4 hours, and the pressure fluctuation amplitude is 5%-10% of the baseline injection pressure. The whole cycle monitoring method combines optical fiber sensing network and seismic monitoring. The optical fiber sensing network is arranged along the injection well and the reservoir boundary to monitor the diffusion front of carbon dioxide in real time. Seismic monitoring uses three-dimensional time-lapse seismic technology to periodically obtain carbon dioxide distribution images in the reservoir.

[0071] The liquid carbon dioxide offshore jacket platform 10 comprises a frame body 7, the top of the frame body 7 is bolted with a protective shell 4, the inside of the protective shell 4 is bolted with a tank body 11, the liquid outlet end of the tank body 11 is communicated with a booster 2, the liquid outlet end of the booster 2 is communicated with a conveying part 3, the surface of the conveying part 3 is bolted with the side of the frame body 7, the inner wall of the tank body 11 is welded with a protective hole disc 12, the side of the protective hole disc 12 is rotatably connected with a rotating shaft 143, the surface of the rotating shaft 143 is key-connected with an adjusting hole disc 13, the adjusting hole disc 13 is close to the protective hole disc 12, the opening in the tank body 11 is welded with a transmission box 141, the rotating shaft 143 is rotatably sleeved with the transmission box 141, the opening in the front side of the protective shell 4 is hingedly connected with a door plate 42, one end of the rotating shaft 143 is key-connected with an adjusting mechanism, the shaft center of the door plate 42 is key-connected with a power mechanism, the protective hole disc 12 and the adjusting hole disc 13 are matched, the hole passage size between the two can be adjusted through the rotation of the adjusting hole disc 13, so that the flow of liquid carbon dioxide between different cavities can be added, the opening of the protective shell 4 can be closed through the door plate 42 to protect the tank body 11 inside;

[0072] The adjusting mechanism comprises a motor 142, a first gear 144 (the first gear 144 is a main bevel gear), a second gear 145 (the second gear 145 is a secondary bevel gear), a first shaft 146 and a second shaft 147, and a transmission assembly, the surface of the motor 142 is bolted with the top end inside the transmission box 141, the output end of the motor 142 is key-connected with the shaft center of the first gear 144, the gear teeth of the first gear 144 are engaged with the gear teeth of the second gear 145, the shaft center of the second gear 145 is key-connected with the top end of the surface of the first shaft 146 and the second shaft 147, the top end and the bottom end of the first shaft 146 and the second shaft 147 are rotatably sleeved with the inside of the transmission box 141, the first shaft 146 and the second shaft 147 are key-connected with the transmission assembly, the power supply of the motor 142 is connected, the power supply adopts an external power supply or a self-provided power supply, the motor 142 is controlled through a controller, the motor 142 can drive the first gear 144 to rotate, the first gear 144 can drive the second gear 145 to rotate, the size of the first gear 144 is smaller than the size of the second gear 145, so that the second gear 145 can be decelerated, the second gear 145 can drive the first shaft 146 and the second shaft 147 to rotate, the first shaft 146 and the second shaft 147 can drive the transmission assembly to rotate;

[0073] The transmission assembly comprises a first pulley 148, a conveying belt 150, a second pulley 149, a third gear 151 (the third gear 151 is a worm), and a fourth gear 152 (the fourth gear 152 is a worm wheel), the bottom end of the surface of the first shaft 146 and the second shaft 147 is in key connection with the shaft center of the first pulley 148, the teeth of the first pulley 148 are in mesh with the inner side of the conveying belt 150, the conveying belt 150 is in mesh with the second pulley 149, the shaft center of the second pulley 149 is in key connection with the bottom end of the surface of the third gear 151, the top end and the bottom end of the third gear 151 are in rotating sleeve connection with the hole in the inside of the transmission box 141, the surface of the third gear 151 is in mesh with the teeth of the fourth gear 152, the fourth gear 152 is in key connection with the rotating shaft 143, the first shaft 146 and the second shaft 147 can drive the first pulley 148 to rotate, the first pulley 148 can drive the conveying belt 150 to rotate, the conveying belt 150 can drive the second pulley 149 to rotate, the radius of the first pulley 148 is smaller than the size of the second pulley 149, so that the second pulley 149 can be decelerated, the second pulley 149 can drive the third gear 151 to rotate, the third gear 151 can drive the fourth gear 152 to rotate, and the fourth gear 152 can drive the rotating shaft 143 to rotate;

[0074] The power mechanism comprises a transmission box 58, an electric push cylinder 51, a sliding strip 52, a hinged rod 53 and a driving assembly, the left side of the transmission box 58 is in bolt connection with the top of the right side of the protective shell 4, the top end in the inside of the transmission box 58 is in bolt connection with the surface of the electric push cylinder 51, the output end of the electric push cylinder 51 is in bolt connection with the top of the sliding strip 52, the sliding strip 52 is in sliding connection with the transmission box 58, the surface of the sliding strip 52 is in hinged connection with the top end of the hinged rod 53, and the hinged rod 53 is in hinged connection with the driving assembly, the transmission box 58 can stabilize the electric push cylinder 51, the electric push cylinder 51 is connected with a power supply, the power supply adopts an external power supply or a self-provided power supply, the electric push cylinder 51 is controlled through a controller, the electric push cylinder 51 can drive the sliding strip 52 to move upwards, the sliding strip 52 is slidingly arranged with the transmission box 58 through a sliding rail, so as to guide the sliding strip 52, and the sliding strip 52 can drive the hinged rod 53 to move upwards, so that the hinged rod 53 can drive the driving assembly to rotate;

[0075] The driving assembly comprises a transmission rod 54, a sliding block 55, a rack 56 and a pinion 57, the bottom end of the articulated rod 53 is hinged to the surface of the transmission rod 54, the right end of the transmission rod 54 is hinged to the right side inside the transmission box 58, the left end of the transmission rod 54 is hinged to the surface of the sliding block 55, the surface of the sliding block 55 is slidably connected with the sliding groove of the rack 56, the back surface of the rack 56 is slidably connected with the inside of the transmission box 58, the teeth of the rack 56 are engaged with the teeth of the pinion 57, the shaft center of the pinion 57 is keyed to the shaft center on the right side of the door plate 42, the articulated rod 53 can drive the transmission rod 54 to rotate upward, the transmission rod 54 is rotatably arranged in the transmission box 58 through a bearing, so as to ensure the stability of the rotation of the transmission rod 54, the transmission rod 54 can drive the sliding block 55 to move upward, in the process of upward movement of the sliding block 55, the sliding block 55 can slide in the sliding groove of the rack 56 and drive the rack 56 to move upward, the rack 56 can drive the pinion 57 to rotate, and the pinion 57 can drive the door plate 42 to rotate downward, so as to close the protective shell 4;

[0076] The bearing hole of the transmission box 141 is welded with a guide cylinder 8, the inside of the guide cylinder 8 is rotatably sleeved with the surface of the rotating shaft 143, the feed end inside the tank body 11 is boltedly connected with a flow guide plate 6, the guide cylinder 8 seals and protects the rotating shaft 143 inside, avoids the leakage of liquid carbon dioxide through the gap between the rotating shaft 143 and the guide cylinder 8, and the flow guide plate 6 can disperse and buffer the liquid carbon dioxide entering the inside of the tank body 11.

[0077] Through the combined purification process, the purity of carbon dioxide can be improved to more than 99.9%, so as to avoid that the impurities in the carbon dioxide cause equipment corrosion and reservoir blockage, and through the cooperation of the protection hole disc 12 and the adjusting hole disc 13, better buffering can be formed, and the risk of the tank body 11 is reduced.

[0078] Working principle: the frame body 7 is installed in the position in the sea where carbon dioxide needs to be stored, the protection shell 4 can protect the tank body 11, the tank body 11 is connected with a carbon dioxide transport ship through the offshore gas pipe docking equipment commonly used in the prior art, liquid carbon dioxide is injected into the inside of the tank body 11, the booster 2 is connected with the power supply, the power supply adopts an external power supply or a self-provided power supply, the motor 142 is controlled through the controller, the motor 142 can drive the first gear 144 to rotate, the first gear 144 can drive the second gear 145 to rotate, the size of the first gear 144 is smaller than the size of the second gear 145, so that the second gear 145 can be decelerated, the second gear 145 can drive the first shaft 146 and the second shaft 147 to rotate, the first shaft 146 and the second shaft 147 can drive the first pulley 148 to rotate, the first pulley 148 can drive the conveying belt 150 to rotate, the conveying belt 150 can drive the second pulley 149 to rotate, the radius of the first pulley 148 is smaller than the size of the second pulley 149, so that the second pulley 149 can be decelerated, the second pulley 149 can drive the third gear 151 to rotate, the third gear 151 can drive the fourth gear 152 to rotate, the fourth gear 152 can drive the rotating shaft 143 to rotate, the rotating shaft 143 can drive the adjusting hole disc 13 to rotate, when the hole of the adjusting hole disc 13 is completely aligned with the hole of the protection hole disc 12, the buffering effect can be reduced, the flow of liquid carbon dioxide in the cavity formed by the protection hole disc 12 is accelerated, when the hole of the adjusting hole disc 13 is completely misaligned with the hole of the protection hole disc 12, the flow of liquid carbon dioxide is blocked, the buffering effect is greater, in this way, the buffering effect can be adjusted by adjusting the size of the hole of the protection hole disc 12 and the adjusting hole disc 13, the protection shell 4 can protect the tank body 11, the transmission box 58 can stabilize the electric push cylinder 51, the electric push cylinder 51 is connected with the power supply, the power supply adopts an external power supply or a self-provided power supply, the electric push cylinder 51 is controlled through the controller, the electric push cylinder 51 can drive the sliding bar 52 to move upwards, the sliding bar 52 is slidingly arranged with the transmission box 58 and guides the sliding bar 52, the sliding bar 52 can drive the hinged rod 53 to move upwards, the hinged rod 53 can drive the transmission rod 54 to rotate upwards, the transmission rod 54 is rotatably arranged with the transmission box 58, so that the stability of the rotation of the transmission rod 54 is guaranteed, the transmission rod 54 can drive the sliding block 55 to move upwards, in the process of moving upwards, the sliding block 55 can slide in the sliding groove of the rack 56 and drive the rack 56 to move upwards, the rack 56 can drive the pinion 57 to rotate, the pinion 57 can drive the door plate 42 to rotate downwards, so as to close the protection shell 4.

[0079] In summary, the beneficial effects of the present application are:

[0080] 1. The combination purification process of pressure swing adsorption and membrane separation can improve the purity of carbon dioxide to more than 99.9%, which can effectively avoid the corrosion of equipment and the plugging of reservoir caused by impurities; at the same time, the whole cycle monitoring system can track the diffusion path of carbon dioxide in real time, and early warning the leakage risk, which can improve the response speed by more than 30% compared with the traditional monitoring method;

[0081] 2. The protective hole disc 12 can separate multiple cavities in the carbon dioxide temporary storage tank, and the matching of the adjusting hole disc 13 can buffer when the carbon dioxide temporary storage tank shakes;

[0082] Through the combination purification process, the purity of carbon dioxide can be improved to more than 99.9%, which can avoid the corrosion of equipment and the plugging of reservoir caused by impurities in carbon dioxide, and through the cooperation of the protective hole disc 12 and the adjusting hole disc 13, a good buffer can be formed to reduce the risk of the carbon dioxide temporary storage tank.

[0083] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0084] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0085] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0087] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the present specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0088] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A method of offshore jacket injection sequestration of liquid carbon dioxide, characterised in that, The method comprises: S1: capturing carbon dioxide from an industrial emission source, removing heavy impurities in the carbon dioxide through low-temperature rectification, separating and purifying the carbon dioxide through a nano membrane, and simultaneously introducing microwave-assisted molecular sieve adsorption in the dehydration link to reduce the water content of the carbon dioxide; S2: pressurizing and cooling the purified carbon dioxide to convert it into liquid carbon dioxide; S3: transporting the liquid carbon dioxide to an offshore jacket platform using a transport ship and storing the liquid carbon dioxide on the offshore jacket platform; S4: pressurizing the liquid carbon dioxide to increase the pressure of the liquid carbon dioxide to 30-100 MPa; S5: injecting the pressurized liquid carbon dioxide into a deep seabed reservoir for carbon dioxide sequestration in the deep seabed reservoir; S6: monitoring the entire cycle after sequestration and early warning of leakage risks.

2. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 1, characterised in that, The offshore jacket platform comprises: a frame body; a storage member arranged on the upper end of the frame body, the storage member being adapted to store liquid carbon dioxide transported by the transport ship; a pressurizing member arranged on the frame body and in communication with the storage member, so that the carbon dioxide in the storage member flows into the pressurizing member, and the pressurizing member is used to pressurize the liquid carbon dioxide; a conveying member arranged on the frame body and extending in the up-down direction, the upper end of the conveying member being in communication with the pressurizing member, and the lower end of the conveying member being adapted to be arranged in a deep seabed geological reservoir, so that the pressurized carbon dioxide is input into the geological reservoir through the conveying member.

3. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 2, characterised in that, The storage member is a plurality of storage members arranged on the frame body and spaced apart along the length direction of the frame body, and the storage member comprises: a tank body having a storage cavity, and the inner circumferential surface of the storage cavity is cylindrical; a plurality of protective hole discs arranged in the storage cavity and spaced apart along the axial direction of the storage cavity to divide the storage cavity into a plurality of sub-cavities, the protective hole disc having a first through hole penetrating the protective hole disc, a plurality of adjusting hole discs, at least one adjusting hole disc is arranged in each sub-cavity, the adjusting hole disc is attached to the protective hole disc, the adjusting hole disc has a second through hole penetrating the adjusting hole disc, and the adjusting hole disc is rotatable in the tank body relative to the tank body about the axial direction of the tank body between a first position and a second position, in the first position, at least part of the first through hole and the second through hole are in communication, so that adjacent sub-cavities are in communication through the first through hole and the second through hole, and in the second position, the adjusting hole disc blocks the first through hole, and the adjusting hole disc blocks the second through hole, so that adjacent adjusting hole discs are disconnected from each other.

4. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 3, characterised in that, The storage member further comprises a first driving device arranged in the tank body, and the first driving device comprises: a transmission box arranged in the tank body; an electric motor arranged in the transmission box; A rotating shaft is arranged in the transmission box and extends along the axial direction of the transmission box, one end of the rotating shaft is connected with the motor so that the motor drives the rotating shaft to rotate, and a plurality of the adjusting hole plates are arranged on the rotating shaft so that the motor drives the adjusting hole plates to rotate between the first position and the second position through the rotating shaft.

5. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 3, wherein, The storage member further comprises a sealing ring, and the transmission box and the rotating shaft are sealed through the sealing ring.

6. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 2, wherein, The first driving device further comprises: a pair of first and second gears which are engaged with each other, the first gear is connected with the motor, and the diameter of the first gear is smaller than that of the second gear; first and second shafts which are rotatably arranged in the transmission box and are axially spaced apart from each other, the second gear is connected with the first shaft so that the second gear drives the first shaft to rotate; first and second pulleys and a conveying belt, the first pulley is connected with the first shaft, the second pulley is connected with the second shaft, the diameter of the first pulley is smaller than that of the second pulley, and the conveying belt is sleeved on the first and second pulleys so that the first shaft drives the second shaft to rotate through the first pulley, the second pulley and the conveying belt; a pair of third and fourth gears which are engaged with each other, the third gear is connected with the second shaft, and the fourth gear is connected with the rotating shaft so that the second shaft drives the rotating shaft to rotate through the third and fourth gears.

7. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 2, characterised in that, Further comprising a protective shell which is arranged on the frame body and sleeved on the storage member, the protective shell comprises a shell body and a door plate, the shell body is arranged on the frame body, and the door plate is arranged above the shell body to close the shell body, and the door plate is rotatable relative to the shell body along the length direction of the frame body.

8. A liquid carbon dioxide offshore jacket injection sequestration method according to claim 7, characterised in that, Further comprising a second driving device which is connected with the door plate so that the second driving device drives the door plate to rotate.

9. The liquid carbon dioxide offshore jacket injection sequestration method of claim 2, wherein, The booster comprises a plurality of booster pumps which are connected in series so that the plurality of booster pumps boost the liquid carbon dioxide.

10. A liquid carbon dioxide offshore jacket injection sequestration method according to any one of claims 1 to 9, characterised in that, In S5, a catalyst solution with a concentration of 0.1%-0.5% is intermittently injected into the deep seabed reservoir, and a pulse injection method is adopted, the injection pressure and flow rate are periodically adjusted every 2-4 hours to form pressure pulses, and the diffusion and dissolution of the pressurized carbon dioxide in the reservoir pores are accelerated.

Images