Interlayer inert gas heat preservation and pressure discharge liquid storage tank

Abstract

The utility model relates to an interlayer inert gas heat preservation and pressure discharge liquid storage tank, which relates to the technical field of oil-gas field development, and comprises a shell, an inner container arranged in the shell and used for storing liquid carbon dioxide, a carbon dioxide conveying pipe and an inert gas circulating cooling system, a gap between the shell and the inner container is a heat preservation cavity, the inert gas circulation cooling system is communicated with an input pipe and an output pipe, the input pipe and the output pipe are both communicated with the heat preservation cavity, the input pipe is communicated with a pressure discharge pipe, and the end, away from the input pipe, of the pressure discharge pipe is communicated with the top of the inner container. One end of the carbon dioxide conveying pipe extends into the bottom of the inner container, and the other end of the carbon dioxide conveying pipe extends out of the shell. The liquid carbon dioxide in the inner container is subjected to heat preservation and pressure discharge through inert gas circulation, the overall structure is simple, and the carbon dioxide storage cost is low.

Description

Technical Field

[0001] The present application relates to the field of oil and gas field development technology, and in particular to an interlayer inert gas insulation pressure discharge liquid storage tank. Background Art

[0002] The application of carbon dioxide in oil production primarily focuses on enhancing oil recovery and geological storage. Injecting carbon dioxide into oil reservoirs leverages its high solubility in crude oil to expand its volume, reduce its viscosity, and thus improve its fluidity. Storing carbon dioxide in oil reservoirs not only enhances oil recovery but also allows for geological storage, reducing greenhouse gas emissions. Furthermore, carbon dioxide flooding has the advantage of having a lower environmental impact than water flooding, leading to its increasing application.

[0003] However, existing carbon dioxide storage tanks have problems such as high insulation costs, complex structures, and difficult system maintenance, which makes the cost of carbon dioxide oil recovery high, thus limiting the application and development of carbon dioxide oil recovery. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a sandwich inert gas insulation pressure discharge liquid storage tank.

[0005] The present application provides a sandwich inert gas insulation pressure discharge liquid storage tank, which adopts the following technical solution:

[0006] A sandwich inert gas insulation pressure-discharge liquid storage tank comprises an outer shell, an inner liner arranged inside the outer shell for storing liquid carbon dioxide, a carbon dioxide delivery pipe and an inert gas circulation cooling system; the gap between the outer shell and the inner liner is an insulation cavity, the inert gas circulation cooling system is connected to an input pipe and an output pipe, both of which are connected to the insulation cavity, the input pipe is connected to a pressure-discharge pipe, one end of the pressure-discharge pipe away from the input pipe is connected to the top of the inner liner, the carbon dioxide delivery pipe is connected to the outer shell and the inner liner respectively, one end of the carbon dioxide delivery pipe extends into the bottom of the inner liner, and the other end extends out of the outer shell, and the liquid level of the liquid carbon dioxide in the inner liner is higher than the height of the bottom opening of the carbon dioxide delivery pipe.

[0007] By adopting the above technical solution, the inert gas circulation cooling system delivers cooled inert gas to the insulation cavity through the input pipe and the output pipe, so that the temperature of the liquid carbon dioxide in the liner is maintained within a preset range, and the inert gas pressure in the liner can be increased by delivering inert gas to the pressure discharge pipe, thereby pushing the liquid carbon dioxide in the liner to be discharged from the liner through the carbon dioxide delivery pipe. When it is necessary to deliver liquid carbon dioxide to the liner, liquid carbon dioxide can be injected into the liner through the carbon dioxide delivery pipe. The insulation and pressure discharge of liquid carbon dioxide are achieved by inert gas, making the carbon dioxide storage structure simple and low-cost, thereby facilitating the promotion of the use of carbon dioxide for oil recovery.

[0008] Preferably, a first valve is provided on the input pipe, a second valve is provided on the pressure discharge pipe, a third valve is provided on the output pipe, and a fourth valve is provided on the carbon dioxide delivery pipe.

[0009] By adopting the above technical solution, when it is necessary to circulate inert gas in the insulation cavity, the first valve and the third valve can be opened and the second valve and the fourth valve can be closed. When it is necessary to discharge liquid carbon dioxide in the inner liner, the second valve and the fourth valve can be opened and the first valve and the third valve can be closed, so that the inert gas is injected into the inner liner, and the liquid carbon dioxide is discharged through the carbon dioxide delivery pipe.

[0010] Preferably, the first valve, the second valve, the third valve and the fourth valve are all solenoid valves, the first valve is electrically connected to a controller, and the controller is electrically connected to the second valve, the third valve and the fourth valve respectively.

[0011] By adopting the above technical solution, the controller controls the opening and closing of the first valve, the second valve, the third valve and the fourth valve, thereby improving the convenience and efficiency of carbon dioxide insulation and discharge.

[0012] Preferably, a temperature sensor is provided in the inner container, and the temperature sensor is connected to the controller signal.

[0013] By adopting the above technical solution, the opening and closing of different valves are controlled according to the data of the temperature sensor. When the temperature in the inner tank is lower than the preset value, the first valve and the third valve are opened, and the second valve and the fourth valve are closed, thereby circulating the cooled inert gas into the insulation cavity.

[0014] Preferably, a liquid level sensor is provided in the inner container, and the liquid level sensor is connected to the controller signal.

[0015] By adopting the above technical solution, the discharge amount of liquid carbon dioxide is controlled according to the data changes of the liquid level sensor, and the storage amount of liquid carbon dioxide in the inner tank is monitored in real time, so that the liquid carbon dioxide can be replenished in the inner tank in time.

[0016] Preferably, the inert gas circulation cooling system also includes an inert gas cooling storage tank and a delivery pump, the air inlet end of the delivery pump is connected to the inert gas cooling storage tank, the air outlet end of the delivery pump is connected to the input pipe, the output pipe is connected to the inert gas cooling storage tank, and the delivery pump is electrically connected to the controller.

[0017] By adopting the above technical solution, the controller controls the delivery pump to deliver inert gas to the heat-insulating cavity or the inner liner, thereby achieving heat preservation or discharge of liquid carbon dioxide.

[0018] Preferably, a heat-insulating layer is provided on the outside of the shell.

[0019] By adopting the above technical solution, the provision of the insulation layer further improves the insulation effect of the liquid carbon dioxide in the liner, thereby reducing the circulation frequency of the inert gas in the insulation cavity and further reducing the storage cost of the liquid carbon dioxide.

[0020] Preferably, the inert gas is nitrogen.

[0021] By adopting the above technical solution, nitrogen has the advantages of stable properties, easy availability and low cost, which is conducive to further reducing the storage cost of liquid carbon dioxide.

[0022] In summary, this application has the following beneficial technical effects:

[0023] 1. This application achieves thermal insulation of the liquid carbon dioxide in the liner by circulating inert gas in the thermal insulation cavity, and promotes the discharge of the liquid carbon dioxide by transporting inert gas into the liner. This makes the liquid carbon dioxide storage structure simple, low-cost and easy to maintain, which is conducive to the promotion of the application of carbon dioxide flooding.

[0024] 2. The temperature in the inner tank is detected by a temperature sensor, and the opening and closing of different valves are automatically controlled by a controller, making the insulation and discharge process of liquid carbon dioxide simple, convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a sandwich inert gas insulation and pressure-discharging tank provided in an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of a partial cross-sectional structure of the sandwich inert gas insulation and pressure discharge tank provided in an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 1. Outer shell; 11. Insulation layer; 2. Inner liner; 3. Carbon dioxide delivery pipe; 31. Fourth valve; 4. Inert gas circulation cooling system; 41. Input pipe; 42. Output pipe; 43. Pressure discharge pipe; 44. First valve; 45. Second valve; 46. Third valve; 47. Inert gas cooling storage tank; 48. Delivery pump; 5. Insulation cavity; 6. Controller; 7. Temperature sensor; 8. Liquid level sensor. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-2 This application is described in further detail.

[0029] The embodiment of the present application discloses a sandwich inert gas insulation pressure discharge liquid storage tank.

[0030] Reference Figure 1 and Figure 2 A sandwich inert gas insulation pressure discharge liquid storage tank includes an outer shell 1, an inner liner 2 arranged inside the outer shell 1 for storing liquid carbon dioxide, a carbon dioxide delivery pipe 3 and an inert gas circulation cooling system 4.

[0031] The gap between the outer shell 1 and the inner liner 2 forms an insulating cavity 5. An inert gas circulation cooling system 4 is fixedly connected to an input pipe 41 and an output pipe 42. Both the input pipe 41 and the output pipe 42 are fixedly connected to the insulating cavity 5. The input pipe 41 is fixedly connected to a pressure relief pipe 43. The end of the pressure relief pipe 43, remote from the input pipe 41, is fixedly connected to the top of the inner liner 2. A carbon dioxide delivery pipe 3 is fixedly connected to the outer shell 1 and the inner liner 2, respectively. One end of the carbon dioxide delivery pipe 3 extends into the bottom of the inner liner 2, and the other end extends out of the outer shell 1. The liquid level of the liquid carbon dioxide in the inner liner 2 is higher than the height of the bottom opening of the carbon dioxide delivery pipe 3.

[0032] A heat-insulating layer 11 is fixedly provided on the outer side of the housing 1. The inert gas is preferably nitrogen.

[0033] A first valve 44 is fixedly provided on the input pipe 41 , a second valve 45 is fixedly provided on the pressure discharge pipe 43 , a third valve 46 is fixedly provided on the output pipe 42 , and a fourth valve 31 is fixedly provided on the carbon dioxide delivery pipe 3 .

[0034] The first valve 44 , the second valve 45 , the third valve 46 and the fourth valve 31 are all solenoid valves. The first valve 44 is electrically connected to the controller 6 , and the controller 6 is electrically connected to the second valve 45 , the third valve 46 and the fourth valve 31 , respectively.

[0035] The first valve 44 , the second valve 45 , the third valve 46 and the fourth valve 31 are all arranged outside the housing 1 , so that the first valve 44 , the second valve 45 , the third valve 46 and the fourth valve 31 can be easily repaired or replaced.

[0036] A temperature sensor 7 is fixedly provided in the inner container 2 and is connected to the controller 6. The temperature sensor 7 has two temperature probes for detecting the temperature in the heat preservation cavity 5 and the inner container 2 respectively.

[0037] A liquid level sensor 8 is fixedly provided in the inner liner 2 and is signal-connected to the controller 6. The liquid level sensor 8 is used to detect the liquid level of the liquid carbon dioxide in the inner liner 2, thereby facilitating timely replenishment of the liquid carbon dioxide in the inner liner 2.

[0038] The inert gas circulation cooling system 4 also includes an inert gas cooling storage tank 47 and a delivery pump 48. The air inlet end of the delivery pump 48 is fixedly connected to the inert gas cooling storage tank 47, the air outlet end of the delivery pump 48 is fixedly connected to the input pipe 41, and the output pipe 42 is fixedly connected to the inert gas cooling storage tank 47. The delivery pump 48 is electrically connected to the controller 6.

[0039] The implementation principle of a sandwich inert gas insulated pressure-discharge liquid storage tank in an embodiment of the present application is: when liquid carbon dioxide needs to be injected, the fourth valve 31 is opened, liquid carbon dioxide is input into the carbon dioxide delivery pipe 3, and the liquid carbon dioxide level in the inner tank 2 is detected by the liquid level sensor 8. When the liquid carbon dioxide reaches the high liquid level, the fourth valve 31 is closed and the injection is stopped.

[0040] The temperature in the inner liner 2 and the insulation cavity 5 is detected by the temperature sensor 7. When the temperature in the inner liner 2 and the insulation cavity 5 exceeds the preset temperature range of -5°C to -10°C, the controller 6 controls the first valve 44 and the third valve 46 to open, closes the second valve 45 and the fourth valve 31, and controls the delivery pump 48 to deliver the low-temperature inert gas in the inert gas cooling storage tank 47 into the insulation cavity 5, so that the temperature of the inner liner 2 and the insulation cavity 5 is maintained within the preset temperature range.

[0041] When liquid carbon dioxide needs to be discharged, the controller 6 controls the first valve 44 and the third valve 46 to close, opens the second valve 45 and delivers inert gas to the pressure discharge pipe 43 through the delivery pump 48, so that the inert gas enters the inner liner 2. The pressure of the inert gas in the inner liner 2 increases, thereby pushing the liquid carbon dioxide to be discharged from the inner liner 2 through the carbon dioxide delivery pipe 3 at the bottom of the inner liner 2. The discharge amount of liquid carbon dioxide is controlled by the liquid level sensor 8. When the liquid carbon dioxide reaches a low liquid level, the controller 6 controls the second valve 45 and the fourth valve 31 to close and stop discharging.

[0042] Then, liquid carbon dioxide needs to be added to the inner liner 2. The controller 6 controls the first valve 44, the second valve 45, the third valve 46, and the fourth valve 31 to open, and liquid carbon dioxide is injected into the inner liner 2 through the carbon dioxide delivery pipe 31. The inert gas in the inner liner 2 enters the input pipe 41 through the pressure discharge pipe 43, enters the insulation cavity 5 through the input pipe 41, circulates in the insulation cavity 5, and is discharged from the insulation cavity 5 through the output pipe 42, thereby reducing the pressure of the inert gas in the inner liner 2, making it easier to inject liquid carbon dioxide into the inner liner 2. When the liquid carbon dioxide in the inner liner 2 reaches the high liquid level, the controller 6 controls the first valve 44, the second valve 45, the third valve 46, and the fourth valve 31 to close.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sandwich inert gas insulation pressure discharge liquid storage tank, characterized by: The invention comprises an outer shell (1), an inner liner (2) arranged inside the outer shell (1) for storing liquid carbon dioxide, a carbon dioxide delivery pipe (3) and an inert gas circulation cooling system (4); the gap between the outer shell (1) and the inner liner (2) is a heat-insulating cavity (5); the inert gas circulation cooling system (4) is connected to an input pipe (41) and an output pipe (42); the input pipe (41) and the output pipe (42) are both connected to the heat-insulating cavity (5); the input pipe (41) is connected to a pressure-discharging pipe (43); one end of the pressure-discharging pipe (43) away from the input pipe (41) is connected to the top of the inner liner (2); the carbon dioxide delivery pipe (3) is connected to the outer shell (1) and the inner liner (2) respectively; one end of the carbon dioxide delivery pipe (3) extends into the bottom of the inner liner (2) and the other end extends out of the outer shell (1); the liquid level of the liquid carbon dioxide in the inner liner (2) is higher than the height of the bottom opening of the carbon dioxide delivery pipe (3).

2. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 1, characterized in that: The input pipe (41) is provided with a first valve (44), the pressure discharge pipe (43) is provided with a second valve (45), the output pipe (42) is provided with a third valve (46), and the carbon dioxide delivery pipe (3) is provided with a fourth valve (31).

3. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 2, characterized in that: The first valve (44), the second valve (45), the third valve (46) and the fourth valve (31) are all solenoid valves. The first valve (44) is electrically connected to a controller (6), and the controller (6) is electrically connected to the second valve (45), the third valve (46) and the fourth valve (31), respectively.

4. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 3, characterized in that: A temperature sensor (7) is provided in the inner container (2), and the temperature sensor (7) is connected to the controller (6) via a signal.

5. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 4, characterized in that: A liquid level sensor (8) is provided in the inner container (2), and the liquid level sensor (8) is connected to the controller (6) via a signal.

6. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 5, characterized in that: The inert gas circulation cooling system (4) further comprises an inert gas cooling storage tank (47) and a delivery pump (48), wherein an air inlet end of the delivery pump (48) is communicated with the inert gas cooling storage tank (47), an air outlet end of the delivery pump (48) is communicated with the input pipe (41), and the output pipe (42) is communicated with the inert gas cooling storage tank (47), and the delivery pump (48) is electrically connected to the controller (6).

7. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 1, characterized in that: A heat-insulating layer (11) is provided on the outside of the shell (1).

8. The sandwich inert gas insulation pressure discharge liquid storage tank according to claim 1, characterized in that: The inert gas is nitrogen.

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