Underwater storage tank

Abstract

The utility model provides an underwater storage tank. The underwater storage tank comprises a structural cabin, a flexible storage bag and an oil guide protection cylinder. The flexible storage bag is located in the structural cabin and can deform under the action of external force, the oil guide protection barrel is arranged in the flexible storage bag in a penetrating mode, and an oil inlet pipeline and an oil outlet pipeline are arranged in the oil guide protection barrel. The bottom of the oil guide protection cylinder is through, a plurality of through holes are formed in the side wall of the oil guide protection cylinder, an outlet of the oil inlet pipeline is communicated with an inner cavity of the flexible storage bag through the through holes, and an inlet of the oil outlet pipeline is communicated with the inner cavity of the flexible storage bag through the bottom of the oil guide protection cylinder and the through holes; an inlet of the oil inlet pipeline and an outlet of the oil outlet pipeline are both located outside the structural cabin. A water inlet and a water outlet are formed in the side wall of the structural cabin. The problems of seawater pollution and resource waste easily caused in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the field of offshore energy exploitation and storage, in particular to an underwater storage tank. Background Art

[0002] Crude oil storage is related to the national energy strategic security, and the reception and storage of crude oil rely on large oil depots, which are generally built at docks near the coastline to facilitate the reception and transportation of crude oil at sea. At present, there is a lack of dock resources for the construction of large oil depots in China. At the same time, the construction of oil depots occupies a large area, the administrative approval time is long, the construction period is long, and the investment is huge. These problems have hindered the pace of construction of large oil depots. Therefore, the concept of offshore oil depots came into being. Crude oil produced and transported at sea can be stored in offshore oil depots, saving dock and land construction resources.

[0003] In the prior art, underwater oil storage solutions are mostly based on large oil storage tanks placed in seawater. However, crude oil stored in tanks can easily come into direct contact with seawater, causing seawater pollution, and crude oil leakage causes waste of resources. Utility Model Content

[0004] The utility model provides an underwater storage tank, which solves the problems of seawater pollution and resource waste in the prior art.

[0005] The utility model provides an underwater storage tank, comprising a structural cabin, a flexible storage bag and an oil guide casing;

[0006] The flexible storage bag is located in the structural cabin and can be deformed under the action of external force. The oil guide casing is passed through the flexible storage bag, and an oil inlet pipeline and an oil outlet pipeline are arranged in the oil guide casing.

[0007] The bottom of the oil guide casing is through-hole, and the side wall of the oil guide casing is provided with a plurality of through holes. The outlet of the oil inlet pipeline is connected to the inner cavity of the flexible storage bag through the bottom of the oil guide casing and the plurality of through holes, and the inlet of the oil outlet pipeline is connected to the inner cavity of the flexible storage bag through the plurality of through holes; the inlet of the oil inlet pipeline and the outlet of the oil outlet pipeline are both located outside the structural cabin;

[0008] The side wall of the structural cabin is provided with a water inlet and a water outlet.

[0009] The utility model can realize the oil-water replacement under seawater by cleverly utilizing the oil-water density difference through the deformation ability of the flexible storage bag, which can avoid the contact and leakage of seawater and crude oil, complete the storage and loading and unloading of crude oil, and thus avoid seawater pollution and waste of resources. In addition, the utility model can effectively alleviate the impact force of crude oil on the flexible storage bag during the loading and unloading process by setting the oil guide casing, which helps to extend the service life of the flexible storage bag, and the oil guide casing, as a rigid component set in the flexible storage bag, can improve the assembly stability of each pipeline (such as the oil inlet pipeline and the oil outlet pipeline) and simplify the assembly difficulty.

[0010] Optionally, when crude oil is loaded, the crude oil enters the inner cavity of the flexible storage bag through the oil inlet pipeline and the bottom of the oil guide casing and the multiple through holes, and the flexible storage bag is deformed and expanded to discharge the seawater between the inner wall of the structural cabin and the outer wall of the flexible storage bag out of the structural cabin through the drain port;

[0011] When crude oil is unloaded, seawater enters between the inner wall of the structural cabin and the outer wall of the flexible storage bag through the water inlet, and the flexible storage bag is squeezed and deformed, so that the crude oil is discharged through the bottom of the oil guide casing, multiple through holes and the oil outlet pipeline.

[0012] Optionally, the cross-sectional diameter of the oil guiding casing segment where the through hole in the oil guiding casing is located is larger than the cross-sectional diameters of the remaining oil guiding casing segments.

[0013] In the embodiment of the utility model, the cross-sectional area of ​​the casing section where the through hole in the oil guiding casing is located is relatively large. Such a structure can make the crude oil flow more smoothly when entering and exiting the oil guiding casing through the through hole, and can also compensate for the rigidity of the opening position to a certain extent, so as to improve the service life of the oil guiding casing.

[0014] Optionally, the underwater storage tank further includes a first delivery pipe, a second delivery pipe and a third delivery pipe; the first delivery pipe is provided with a first delivery valve, and the first delivery pipe is connected to the second delivery pipe through the first delivery valve to form a double-pipe loop;

[0015] A second delivery valve is provided on the oil inlet pipeline, and the oil inlet pipeline is connected to the second delivery pipe through the second delivery valve. A third delivery valve is provided on the third delivery pipe, and the third delivery pipe is connected to the first delivery valve and the second delivery valve through the third delivery valve.

[0016] The embodiments of the utility model enrich the functions of the oil inlet pipeline by setting up multiple delivery pipes and corresponding valves. For example, the functions of pipeline preheating, pipeline cleaning, replacement and anti-blocking can be realized through the cooperation of various pipelines and valves, which helps to extend the service life of the oil inlet pipeline, reduce failures, and improve the operating efficiency of the underwater storage tank.

[0017] Optionally, the underwater storage tank further includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe;

[0018] A first connecting pipe is provided with a first connecting valve, and the first connecting pipe is connected to the second connecting pipe through the first connecting valve to form a double-pipe loop;

[0019] A second connecting valve is provided on the oil outlet pipeline, and the oil outlet pipeline is connected to the second connecting pipe through the second connecting valve; a third connecting valve is provided on the third connecting pipe, and the third connecting pipe is connected to the first connecting pipe and the oil outlet pipeline through the third connecting valve; a fourth connecting valve is provided on the fourth connecting pipe, and the fourth connecting pipe is connected to the second connecting pipe and the oil guide casing through the fourth connecting valve; a fifth connecting valve is provided on the fifth connecting pipe, and the fifth connecting pipe is connected to the first connecting pipe and the fourth connecting pipe through the fifth connecting valve.

[0020] The embodiments of the utility model enrich the functions of the oil outlet pipeline by setting a plurality of connecting pipes and corresponding valves. For example, the functions of pipeline preheating, pipeline cleaning, replacement and anti-blocking can be realized through the cooperation of various pipelines and valves, which helps to extend the service life of the oil outlet pipeline, reduce failures, and improve the operating efficiency of the underwater storage tank.

[0021] Optionally, the material of the flexible storage bag is at least one of the following: silicone, rubber, and multi-layer composite polyurethane.

[0022] Optionally, the top of the flexible storage bag, the top of the oil guide casing and the top of the structural cabin are connected together through a flange structure.

[0023] Optionally, studs are provided at the bottom of the flexible storage bag, and the bottom of the flexible storage bag is fixed to the bottom of the structural cabin through the studs.

[0024] Optionally, the underwater storage tank further includes a delivery pump, which is connected to the inlet of the oil outlet pipeline and is located in the flexible storage bag to deliver the oil in the flexible storage bag to the outside of the structural cabin.

[0025] Optionally, the underwater storage tank further includes a liquid level sensor, a pressure sensor and a temperature sensor, and the liquid level sensor, the pressure sensor and the temperature sensor are all arranged in the oil guide casing to detect the oil storage status in the flexible storage bag.

[0026] Optionally, there are multiple water inlets and multiple drainage outlets, the multiple water inlets are located on one side wall of the structural cabin, and the multiple drainage outlets are located on the other side wall of the structural cabin.

[0027] Optionally, a water inlet pipe and a water outlet pipe are provided on the side wall of the structural cabin, the water inlet pipe is connected to the water inlet, and the water outlet pipe is connected to the water outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the underwater storage tank of an embodiment of the utility model, wherein the flexible storage bag is in an expanded state;

[0029] Figure 2 It is a schematic diagram of the structure of the underwater storage tank of an embodiment of the utility model, wherein the flexible storage bag is in an extruded deformation state;

[0030] Figure 3 It is a structural schematic diagram of an underwater storage tank according to an embodiment of the utility model, wherein the side wall of the oil guide casing is serrated;

[0031] Figure 4 This is a schematic diagram of the structure of an underwater storage tank according to an embodiment of the utility model, wherein a delivery pump is provided at the inlet of the oil outlet pipeline;

[0032] Figure 5 It is a schematic diagram of the structure of an underwater storage tank according to an embodiment of the utility model, wherein both the oil inlet pipeline and the oil outlet pipeline are provided with a double-tube loop;

[0033] Figure 6 This is a schematic diagram of the pipeline design structure at the oil inlet pipeline in the underwater storage tank of the utility model embodiment;

[0034] Figure 7 This is a schematic diagram of the pipeline design structure at the oil outlet pipeline in the underwater storage tank of the utility model embodiment.

[0035] Description of reference numerals:

[0036] 1: Underwater storage tank;

[0037] 11: structural cabin; 111: water inlet; 112: drain outlet; 113: pump well; 12: flexible storage bag; 121: stud; 122: flange structure; 13: oil guide casing; 131: through hole; 132: oil inlet pipeline; 133: oil outlet pipeline; 14: delivery pump; 15: water inlet pipeline; 16: water outlet pipeline;

[0038] 171: first delivery pipe; 172: second delivery pipe; 173: third delivery pipe;

[0039] 181: first connecting pipe; 182: second connecting pipe; 183: third connecting pipe;

[0040] A: first delivery valve; B: second delivery valve; C: third delivery valve;

[0041] D: first connecting valve; E: second connecting valve; F: third connecting valve; G: fourth connecting valve; H: fifth connecting valve. DETAILED DESCRIPTION

[0042] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0043] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0044] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0045] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0046] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0047] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] The underwater storage tank 1 of the embodiment of the utility model can be used to store oil products such as crude oil, diesel, gasoline, liquefied petroleum gas, condensate oil, etc., and can also be used to store new energy products such as methanol, liquid ammonia, liquid CO2, etc.

[0049] It can be used as an independent storage unit or can be combined and arranged as an underwater storage tank group as a joint storage unit.

[0050] Specifically, the utility model provides an underwater storage tank 1, see Figure 1 and Figure 2 , including a structural cabin 11, a flexible storage bag 12 and an oil guiding sleeve 13.

[0051] The flexible storage bag 12 is located in the structural cabin 11 and can be deformed under the action of external force. The oil guide sleeve 13 is passed through the flexible storage bag 12. The oil guide sleeve 13 is provided with an oil inlet pipe 132 and an oil outlet pipe 133.

[0052] The bottom of the oil guiding casing 13 is through-connected, and a plurality of through holes 131 are provided on the side wall of the oil guiding casing 13; the outlet of the oil inlet pipe 132 is connected to the inner cavity of the flexible storage bag 12 through the bottom of the oil guiding casing and the plurality of through holes 131; the inlet of the oil outlet pipe 133 is connected to the inner cavity of the flexible storage bag 12 through the plurality of through holes 131; the inlet of the oil inlet pipe 132 and the outlet of the oil outlet pipe 133 are both located outside the structural cabin 11.

[0053] A water inlet 111 and a water outlet 112 are formed on the side wall of the structural cabin 11 .

[0054] The utility model can realize the oil-water replacement under seawater by ingeniously utilizing the oil-water density difference through the deformation ability of the flexible storage bag 12, which can avoid the contact and leakage of seawater and crude oil, complete the storage and loading and unloading of crude oil, and avoid seawater pollution and waste of resources. In addition, the utility model can effectively alleviate the impact force of crude oil on the flexible storage bag 12 during the loading and unloading process by setting the oil guide sleeve 13, which helps to extend the service life of the flexible storage bag 12, and the oil guide sleeve 13, as a rigid component set in the flexible storage bag 12, can improve the assembly stability of each pipeline (such as the oil inlet pipeline 132 and the oil outlet pipeline 133), and simplify the assembly difficulty.

[0055] The material of the flexible storage bag 12 is at least one of the following: silicone, rubber, and multi-layer composite polyurethane. At least one of the following can be understood as the material of the flexible storage bag 12 can be composed of any of the above materials alone, or a composite material formed by multiple of the above materials.

[0056] Specifically, Figure 1 As shown, when crude oil is loaded, the crude oil enters the inner cavity of the flexible storage bag 12 through the oil inlet pipe 132 and the bottom of the oil guide sleeve 13 and the multiple through holes 131, and the flexible storage bag 12 is deformed and expanded to discharge the seawater between the inner wall of the structural cabin 11 and the outer wall of the flexible storage bag 12 out of the structural cabin 11 through the drain port 112;

[0057] like Figure 2 As shown, when crude oil is unloaded, seawater enters between the inner wall of the structural cabin 11 and the outer wall of the flexible storage bag 12 through the water inlet 111, and the flexible storage bag 12 is squeezed and deformed, so that the crude oil is discharged through the bottom of the oil guide casing 13, multiple through holes 131 and the oil outlet pipeline 133.

[0058] The number of the through holes 131 is not limited. Furthermore, the arrangement of the through holes 131 is not limited. For example, the through holes 131 may be evenly distributed on the side wall of the oil guide casing 13 or may be unevenly distributed.

[0059] In one embodiment, along the extension direction of the oil guiding casing 13, the diameter of the through hole 131 near the top of the oil guiding casing 13 is greater than the diameter of the through hole 131 near the bottom of the oil guiding casing 13. Such a structure enables the through hole 131 in the upper part of the oil guiding casing 13 to still ensure a certain amount of crude oil flow when the flexible storage bag 12 is squeezed and deformed (or can be understood as contracted) to cover and block the through hole 131 at the lower part of the oil guiding casing 13 during crude oil unloading, so as to ensure the crude oil unloading efficiency.

[0060] In addition, the number of the oil guiding casing 13, the oil inlet pipeline 132 and the oil outlet pipeline 133 is not limited. For example, multiple oil inlet pipelines 132 and multiple oil outlet pipelines 133 can be arranged in the same oil guiding casing 13, or there can be multiple oil guiding casings 13, each of which can be provided with an oil inlet pipeline 132 and an oil outlet pipeline 133, or multiple oil inlet pipelines 132 and multiple oil outlet pipelines 133 can be arranged in each oil guiding casing 13.

[0061] In one implementation, see Figure 3 The cross-sectional diameter of the oil guide casing section where the through hole 131 in the oil guide casing 13 is located (eg Figure 3 d2) is larger than the cross-sectional diameter of the remaining oil guide casing sections (such as Figure 3 As shown in d1). In one embodiment, Figure 3 As shown, the side wall of the oil guiding casing 13 is serrated. In other alternative implementations, the side wall of the oil guiding casing 13 may also be wavy or convex.

[0062] In the embodiment of the utility model, the cross-sectional area of ​​the casing section where the through hole 131 in the oil guiding casing 13 is located is relatively large. Such a structure can make the crude oil flow more smoothly when passing through the through hole 131 into and out of the oil guiding casing 13, thereby improving the replacement speed of the density difference between the crude oil and seawater, thereby improving the loading and unloading efficiency of the crude oil, and can also compensate for the rigidity of the opening position to a certain extent, so as to increase the service life of the oil guiding casing 13.

[0063] The structural cabin 11 can be used as a second layer of protective shield to prevent seawater from entering and exiting the flexible storage capsule 12. The shape of the structural cabin 11 is not limited, and can be a round cylindrical flat bottom, a rectangular cylindrical flat bottom, an elliptical head round cylindrical flat, a hemispherical head round cylindrical flat bottom, a sphere, etc. The material of the structural cabin 11 is not limited, and can be a steel structure material, such as fiberglass, or a fiber-reinforced composite material or cement, etc.

[0064] There are multiple water inlets 111 and multiple water outlets 112 on the structural cabin 11. The multiple water inlets 111 are located on one side wall of the structural cabin 11, and the multiple water outlets 112 are located on the other side wall of the structural cabin 11. In one embodiment, Figure 1 and Figure 2 As shown, a plurality of water inlets 111 are sequentially arranged on one side wall of the structural cabin 11 along the direction of gravity, and a plurality of water outlets 112 are sequentially arranged on the other side wall of the structural cabin 11 along the direction of gravity. The water inlets 111 and the water outlets 112 can be respectively arranged on two opposite side walls of the structural cabin, or on two adjacent side walls. The side wall of the structural cabin 11 is also provided with a water inlet pipe 15 and a water outlet pipe 16, the water inlet pipe 15 is connected to the water inlet 111, and the water outlet pipe is connected to the water outlet 112.

[0065] In one embodiment, the top of the flexible storage bag 12, the top of the oil guide sleeve 13 and the top of the structural cabin 11 are connected together by a flange structure. The flange structure can enhance the tightness of the connection between the flexible storage bag 12, the oil guide sleeve 13 and the structural cabin 11, and effectively improve the sealing performance of the flexible storage bag 12. In one embodiment, the top of the flexible storage bag 12 is provided with a first flange, the top of the structural cabin 11 is provided with a second flange, and the top of the oil guide sleeve 13 is provided with a third flange. The first flange, the second flange and the third flange are fixed together by screws and studs, so that the top of the flexible storage bag 12, the top of the oil guide sleeve 13 and the top of the structural cabin 11 are fixed together. Further, in one embodiment, a plurality of mounting holes are opened at the top of the flexible storage bag 12, and the first flange is fixed to the flexible storage bag by a connector in the plurality of mounting holes. In other alternative embodiments, the first flange can also be bonded to the top of the flexible storage bag 12.

[0066] See also Figure 1 and Figure 2 In one embodiment, a stud 121 is provided at the bottom of the flexible storage bag 12, and the bottom of the flexible storage bag 12 is fixed to the bottom of the structural cabin 11 through the stud 121. In an exemplary embodiment, the stud 121 is bonded to the bottom of the flexible storage bag 12. In one embodiment, a hole is opened at the bottom of the flexible storage bag 12, and the stud 121 extends from the hole at the bottom of the flexible storage bag. An annular steel plate is provided on the outer wall of the stud, and the annular steel plate is stuck inside the oil bag to cut and seal the hole. In one embodiment, the structure of the stud combined with the annular steel plate can also be replaced by screws.

[0067] In other alternative implementations, the bottom of the flexible storage bag 12 may also be connected to the bottom of the structural cabin 11 by using a flange structure. The specific connection method is similar to the top flange structure and will not be repeated here.

[0068] The flexible storage bag 12 of the embodiment of the utility model is detachably connected to the structural cabin 11 through a flange structure at the top and a stud structure at the bottom, so that the flexible storage bag has a strong anti-swaying ability and is easy to maintain.

[0069] For further information, see Figure 4 In one embodiment, the underwater storage tank 1 further comprises a delivery pump 14, which is connected to the inlet of the oil outlet pipeline 133 and is located in the flexible storage bag 12 to deliver the oil in the flexible storage bag 12 to the outside of the structural cabin 11. The utility model is not limited to the type of the delivery pump 14, as long as it is a device that can deliver crude oil to the outside through the oil outlet pipeline, it does not depart from the scope of the embodiment of the utility model. In one embodiment, the bottom of the structural cabin 11 is provided with a pump well 113 (such as Figure 3 As shown), the pump well 113 may be formed by, for example, a groove at the bottom of the structural cabin 11 , and a portion of the flexible storage bag 12 and the delivery pump 14 are disposed in the pump well 113 .

[0070] Furthermore, the underwater storage tank also includes a liquid level sensor, a pressure sensor and a temperature sensor, and the liquid level sensor, the pressure sensor and the temperature sensor are all arranged in the oil guide casing to detect the oil storage state in the flexible storage bag.

[0071] The following is an example of a crude oil loading and unloading process in one embodiment:

[0072] When the crude oil is loaded, the crude oil passes through the oil inlet pipe 132 on the underwater storage tank, and then enters the oil guide casing 13 through the upper channel flange connected to the oil inlet pipe 132, and finally enters the flexible storage bag 12 through the through hole 131 on the oil guide casing 13. The flexible storage bag 12 will continue to expand to store crude oil, thereby squeezing the volume of seawater in the structural cabin 11. The seawater is discharged from the structural cabin 11 through the drain port 112 and discharged through the water outlet pipe 16. The discharge port of the water outlet pipe 16 is equipped with an oil-water monitor to monitor the oil content of the drainage in real time to determine whether there is a leak in the flexible storage bag 12, so as to facilitate timely replacement and maintenance of the corresponding underwater storage tank. The oil guide casing 13 inside the flexible storage bag 12 is equipped with a crude oil level monitor to determine the loading capacity of the flexible storage bag 12 and provide real-time monitoring of crude oil loading.

[0073] When crude oil is unloaded, the unloading oil pump (such as the delivery pump 14) is started, the seawater inlet pipe 15 is opened, and the seawater enters the structural cabin 11 through the inlet pipe 15 and the water inlet 111. The seawater continuously squeezes the volume of the flexible storage capsule 12, and the crude oil in the flexible storage capsule 12 enters the oil guide casing 13 through the through hole 131 on the oil guide casing 13, and is squeezed out of the flexible storage capsule 12 through the oil outlet pipe 133 in the oil guide casing 13, and the crude oil is transported out of the underwater storage tank through the upper channel flange. The oil guide casing 13 inside the flexible storage capsule 12 is equipped with a crude oil level monitor to determine the loading amount of the flexible storage capsule 12 and provide real-time monitoring of crude oil unloading.

[0074] In one embodiment, see Figures and Figure 6The underwater storage tank 1 further includes a first delivery pipe 171, a second delivery pipe 172 and a third delivery pipe 173. The first delivery pipe 171 is provided with a first delivery valve A, and the first delivery pipe 171 is connected to the second delivery pipe 172 through the first delivery valve A to form a double-tube loop.

[0075] A second delivery valve B is provided on the oil inlet pipeline 132, and the oil inlet pipeline 132 is connected to the second delivery pipe 172 through the second delivery valve B. A third delivery valve C is provided on the third delivery pipe 173, and the third delivery pipe 173 is connected to the first delivery pipe 171 and the second delivery pipe 172 through the third delivery valve C. Or it can be understood that: the inlet of the third delivery pipe 173 is connected to the pipe section of the first delivery pipe 171 located before the first delivery valve A, and the outlet of the third delivery pipe 173 is connected to the pipe section of the oil inlet pipeline 132 located after the second delivery valve B.

[0076] Through the above structure, the embodiment of the utility model can realize various working conditions of the oil inlet pipeline 132 end. For example, the preheating operation condition can be specifically as follows: open the first delivery valve A, close the second delivery valve B and the third delivery valve C, input hot water from the oil delivery end into the pipeline, and the hot water passes through the double-tube loop formed by the first delivery pipe 171 and the second delivery pipe 172 to form a circulation loop and return to the oil delivery end, completing the circulation of hot water in the pipeline, and finally completing the preheating operation of the pipeline. For example, the production operation condition can be specifically as follows: after completing the pipeline preheating, close the first delivery valve A, open the second delivery valve B and the third delivery valve C, and start the crude oil delivery pump at the oil delivery end to deliver crude oil, which enters the underwater storage tank through the oil inlet pipeline 132 to complete the delivery and storage operation. For example, the cleaning operation condition can be specifically as follows: when the pipeline needs to be replaced and cleaned, the first delivery valve A is opened, the third delivery valve C is closed, and a cleaning ball is introduced from the oil delivery end, passing through the submarine pipeline to the first delivery pipe 171, and the cleaning ball passes through the double-pipe loop of the first delivery pipe 171 and the second delivery pipe 172, and returns to the second delivery pipe 172, and finally returns to the oil delivery end, completing the replacement and cleaning of the oil delivery pipeline, achieving uninterrupted normal production of crude oil and synchronous cleaning. For example, the replacement operation condition can be specifically as follows: the first delivery pipe 171 is in normal production and oil delivery operation, the second delivery valve B is opened, and hot water is input from the oil delivery end into the second delivery pipe 172 to replace the remaining crude oil in the second delivery pipe 172 into the underwater storage tank, to prevent crude oil solidification and clogging the pipeline, and complete the replacement operation of the crude oil pipeline.

[0077] It can be seen that the above structure enriches the functions of the oil inlet pipeline through the arrangement of multiple delivery pipes and corresponding valves. For example, the cooperation of various pipelines and valves can realize functions such as pipeline preheating, pipeline cleaning, replacement and anti-blocking, which helps to extend the service life of the oil inlet pipeline, reduce failures, and improve the operating efficiency of the underwater storage tank.

[0078] For further information, see Figure 5 and Figure 7 The underwater storage tank further includes a first connecting pipe 181, a second connecting pipe 182, a third connecting pipe 183, a fourth connecting pipe 184 and a fifth connecting pipe 185. The first connecting pipe 181 is provided with a first connecting valve D, and the first connecting pipe 181 is connected to the second connecting pipe 182 through the first connecting valve D to form a double-tube loop.

[0079] The oil outlet pipeline 133 is provided with a second connecting valve E, and the oil outlet pipeline 133 is connected to the second connecting pipe 182 through the second connecting valve E. The third connecting pipe 183 is provided with a third connecting valve F, and the third connecting pipe 183 is connected to the first connecting pipe 181 and the oil outlet pipeline 133 through the third connecting valve F. The fourth connecting pipe 184 is provided with a fourth connecting valve G, and the fourth connecting pipe 184 is connected to the second connecting pipe 182 and the oil guide casing 13 through the fourth connecting valve G. The fifth connecting pipe 185 is provided with a fifth connecting valve H, and the fifth connecting pipe 185 is connected to the first connecting pipe 181 and the fourth connecting pipe 184 through the fifth connecting valve H.

[0080] Through the above structure, the embodiment of the utility model can realize various working conditions of the oil outlet pipeline 133 end, for example, the preheating operation condition can be specifically as follows: open the first connecting valve D, close the second connecting valve E and the third connecting valve F, input hot water from the oil delivery end to preheat the pipeline, and the hot water returns to the second connecting pipe 182 through the double-pipe loop formed by the first connecting pipe 182 and the second connecting pipe 182, forming a circulation loop to return to the oil delivery end, and finally completing the preheating operation of the pipeline. For example, the crude oil unloading operation condition can be specifically as follows: due to the huge amount of unloading crude oil, start the double-pipe to transport crude oil to the receiving end, that is, the first connecting pipe 181 and the second connecting pipe 182 are used to transport crude oil, close the first connecting valve D, open the second connecting valve E and the third connecting valve F, start the delivery pump 14, and the crude oil is output through the oil outlet pipeline 133, the first connecting pipe 181 and the second connecting pipe 183, and the unloading of crude oil is completed. For example, the replacement operation condition can be specifically as follows: after the unloading of crude oil is completed, the second connecting valve E and the second connecting valve F are closed, the fifth connecting valve G and the fourth connecting valve H are opened, and hot water is input from the receiving end to enter the first connecting pipe 181 and the second connecting pipe 182 to replace the crude oil in the pipeline and enter the underwater storage tank, so as to avoid the crude oil solidification and blocking the pipeline, and complete the replacement and cleaning operation of the crude oil export pipeline. For example, the circulating heating operation condition can be specifically as follows: when the temperature of the crude oil in the underwater storage tank decreases and needs to be heated, the second connecting valve E and the fifth connecting valve G are opened, the fourth connecting valve H and the third connecting valve F are closed, and the delivery pump 14 in the underwater storage tank is started. After the crude oil is delivered to the receiving end through the oil outlet pipeline 133 and the second connecting pipe 182 for heating, it is returned to the underwater storage tank through the first connecting pipe 181, the fifth connecting pipe 185, and the fourth connecting pipe 184 to form a heating cycle, and finally the heating operation of the crude oil in the underwater storage tank is completed to meet the crude oil storage temperature requirements.

[0081] It can be seen that the above structure enriches the functions of the oil outlet pipeline through the multiple connecting pipes and corresponding valve settings. For example, the cooperation of various pipes and valves can realize functions such as pipeline preheating, pipeline cleaning, replacement and anti-blocking, and crude oil heating, which helps to extend the service life of the oil outlet pipeline, reduce failures, and improve the operating efficiency of the underwater storage tank.

[0082] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An underwater storage tank, characterized in that: It includes a structural cabin, a flexible storage bag and an oil-conducting casing; The flexible storage bag is located in the structural cabin and can be deformed under the action of external force, the oil guide casing is passed through the flexible storage bag, and an oil inlet pipeline and an oil outlet pipeline are arranged in the oil guide casing; The bottom of the oil guide casing is through-through, and a plurality of through holes are arranged on the side wall of the oil guide casing. The outlet of the oil inlet pipeline is connected to the inner cavity of the flexible storage bag through the bottom of the oil guide casing and the plurality of through holes, and the inlet of the oil outlet pipeline is connected to the inner cavity of the flexible storage bag through the plurality of through holes; the inlet of the oil inlet pipeline and the outlet of the oil outlet pipeline are both located outside the structural cabin; The side wall of the structural cabin is provided with a water inlet and a water outlet.

2. The underwater storage tank according to claim 1, characterized in that: When crude oil is loaded, the crude oil enters the inner cavity of the flexible storage bag through the oil inlet pipeline and the bottom of the oil guide casing and the multiple through holes, and the flexible storage bag is deformed and expanded to discharge the seawater between the inner wall of the structural cabin and the outer wall of the flexible storage bag out of the structural cabin through the drain port; When crude oil is unloaded, seawater enters between the inner wall of the structural cabin and the outer wall of the flexible storage bag through the water inlet, and the flexible storage bag is squeezed and deformed, so that the crude oil is discharged through the bottom of the oil guide casing, the multiple through holes and the oil outlet pipeline.

3. The underwater storage tank according to claim 1 or 2, characterized in that: The cross-sectional diameter of the oil guiding casing section where the through hole is located in the oil guiding casing is larger than the cross-sectional diameters of the other oil guiding casing sections.

4. The underwater storage tank according to claim 1 or 2, characterized in that: It also includes a first delivery pipe, a second delivery pipe and a third delivery pipe; the first delivery pipe is provided with a first delivery valve, and the first delivery pipe is connected to the second delivery pipe through the first delivery valve to form a double-pipe loop; The oil inlet pipeline is provided with a second delivery valve, and the oil inlet pipeline is connected to the second delivery pipe through the second delivery valve. The third delivery pipe is provided with a third delivery valve, and the third delivery pipe is connected to the first delivery pipe and the second delivery pipe through the third delivery valve.

5. The underwater storage tank according to claim 1 or 2, characterized in that: It also includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe; The first communicating pipe is provided with a first communicating valve, and the first communicating pipe is connected to the second communicating pipe through the first communicating valve to form a double-pipe loop; The oil outlet pipeline is provided with a second connecting valve, and the oil outlet pipeline is connected to the second connecting pipe through the second connecting valve; the third connecting pipe is provided with a third connecting valve, and the third connecting pipe is connected to the first connecting pipe and the oil outlet pipeline through the third connecting valve; the fourth connecting pipe is provided with a fourth connecting valve, and the fourth connecting pipe is connected to the second connecting pipe and the oil guide casing through the fourth connecting valve; the fifth connecting pipe is provided with a fifth connecting valve, and the fifth connecting pipe is connected to the first connecting pipe and the fourth connecting pipe through the fifth connecting valve.

6. The underwater storage tank according to claim 1 or 2, characterized in that: The material of the flexible storage bag is at least one of the following: silicone, rubber, and multi-layer composite polyurethane.

7. The underwater storage tank according to claim 1 or 2, characterized in that: The top of the flexible storage bag, the top of the oil guide sleeve and the top of the structural cabin are connected together through a flange structure, and the bottom of the flexible storage bag is fixed to the bottom of the structural cabin.

8. The underwater storage tank according to claim 1 or 2, characterized in that: It also includes a delivery pump, which is connected to the inlet of the oil outlet pipeline and is located in the flexible storage bag to deliver the oil in the flexible storage bag to the outside of the structural cabin.

9. The underwater storage tank according to claim 1 or 2, characterized in that: It also includes a liquid level sensor, a pressure sensor and a temperature sensor. The liquid level sensor, the pressure sensor and the temperature sensor are all arranged in the oil guide sleeve to detect the oil storage state in the flexible storage bag.

10. The underwater storage tank according to claim 1 or 2, characterized in that: There are multiple water inlets and multiple drainage outlets, and the multiple water inlets are located on one side wall of the structural cabin, and the multiple drainage outlets are located on the other side wall of the structural cabin.

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