Carbon dioxide oil displacement dry ice heating sublimation device and use method

Abstract

The application belongs to the technical field of oil exploitation, and particularly relates to a dry ice heating and sublimation device for carbon dioxide oil displacement and a use method. The device comprises a cylinder, a sealing assembly, a stacking assembly and a heating assembly. The sealing assembly comprises a round plug, a lower lug, a round rod and a motor. The round plug is in sealing connection with the lower end surface of the cylinder. The output end of the motor drives the round rod to drive the round plug to move up and down. The stacking assembly is located in the cylinder and comprises a support frame and a plurality of round net plates. The heating assembly comprises a peristaltic pump, an electromagnetic heating plate, an external steel pipe connected with the peristaltic pump in sequence, and an internal steel pipe. The internal steel pipe is in a spiral shape and is located between the inner wall of the cylinder and the outer side of the support frame. The outer side of the external steel pipe is provided with the electromagnetic heating plate. The device can concentrate the dry ice and has a circulating flow heating assembly, so that the dry ice can be uniformly heated, sublimated quickly, the water flow speed is fast, and the situation that the water flow speed is slow and the pipe body is blocked by ice can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of petroleum extraction technology, and specifically relates to a dry ice heating and sublimation device for carbon dioxide flooding and its usage method. Background Technology

[0002] Carbon dioxide flooding technology is a technique that injects carbon dioxide into the oil reservoir to improve the oil recovery rate of the oil field. When carbon dioxide first comes into contact with the formation crude oil, it cannot form a miscible phase. However, under suitable pressure, temperature and crude oil composition conditions, carbon dioxide can form a miscible front. Supercritical fluid will extract heavier hydrocarbons from the crude oil and continuously concentrate the gas at the displacement front. Thus, carbon dioxide and crude oil become a miscible liquid, forming a single liquid phase, which can effectively displace the formation crude oil to the production well.

[0003] Currently, among carbon dioxide enhanced oil recovery technologies in oil fields, liquid phase carbon dioxide injection technology is the most widely used. Existing technologies store compressed carbon dioxide in tanks. Compared to dry ice, this method has a smaller storage capacity and occupies more space. Dry ice offers larger storage capacity and is easier to transport, but its sublimation at room temperature takes a long time, and existing storage tanks lack the space structure to hold heated dry ice. Furthermore, the heat absorption during dry ice sublimation can cause slow-flowing liquids inside pipelines to freeze. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a dry ice heating and sublimation device and method for carbon dioxide flooding. This device can centrally store dry ice and has a circulating heating component, which facilitates centralized and uniform heating of dry ice for rapid sublimation. The fast water flow rate avoids the situation where slow water flow causes ice to form and block the pipe.

[0005] The technical solution of this invention is as follows: a dry ice heating sublimation device for carbon dioxide flooding, comprising a cylinder, a sealing assembly, a stacking assembly, and a heating assembly. The top of the cylinder is a closed end face, and a bent pipe is connected to the center of the closed end face. The sealing assembly includes a circular plug, two lower ear plates, two round rods, and two motors. The circular plug is sealed to the lower end face of the cylinder. Two lower ear plates are symmetrically installed on the annular side of the circular plug. The upper surfaces of the two lower ear plates are respectively fixedly connected to the round rods. The top surfaces of the two round rods are respectively provided with screw holes, and thin screws are provided in the screw holes. The top of the thin screws is connected to the output of the motors. The stacking assembly, located inside the cylinder, includes a support frame and multiple circular mesh plates. The support frame is U-shaped, with the U-shaped open end fixedly connected to the upper surface of the circular plug. The circular mesh plates are circular, with multiple mesh holes on their circular surfaces. The multiple circular mesh plates are equidistantly installed between the inner side walls of the support frame. The heating assembly includes a peristaltic pump, an electromagnetic heating plate, an external steel pipe connected in sequence to the peristaltic pump, and an internal steel pipe. The internal steel pipe is spiral-shaped and located between the inner wall of the cylinder and the outer side of the support frame. The external steel pipe is located on both sides of the annular side of the cylinder, and an electromagnetic heating plate is provided on the outer side of the external steel pipe.

[0006] An electric regulating valve is installed on the bend.

[0007] An upper ear plate is provided directly above the two lower ear plates and on the annular side of the circular plug, and the motor is fixedly installed on the upper part of the two upper ear plates respectively.

[0008] The lower opening of the cylinder is provided with a concave ring, and the top of the circular plug is provided with a circular protrusion that matches the shape of the concave ring.

[0009] The upper outer side of the cylinder is provided with a left round flat box and a right round flat box. The bottom of the left round flat box and the right round flat box are respectively provided with the electromagnetic heating plate. The external steel pipe is located inside the left round flat box and the right round flat box and above the electromagnetic heating plate.

[0010] The number of circular mesh plates is 5, and the height of the cylinder is greater than the length of the support frame.

[0011] A method of using a dry ice heating and sublimation apparatus for carbon dioxide flooding, comprising the following steps, using any of the dry ice heating and sublimation apparatuses for carbon dioxide flooding as described above:

[0012] S1: The motor drives the connected fine screw to rotate, which moves the round rod connected by the screw hole down. The round rod drives the round plug to disengage from the cylinder opening, and the round mesh plate moves out of the cylinder. Dry ice is placed on the round mesh plate. Then the motor reverses to close and seal the round plug with the cylinder opening.

[0013] S2: By installing spirally distributed internal steel pipes on the inner ring wall of the cylinder, the dry ice on the circular grid plate can be surrounded. The internal steel pipes and the external steel pipes on both sides form a circulation pipe. The water in the external steel pipes is heated by an electromagnetic heating plate. The water circulation is achieved by running a peristaltic pump, which accelerates the sublimation of dry ice.

[0014] S3: After the dry ice sublimates, it is discharged outward through the bend pipe by an electric regulating valve to carry out carbon dioxide oil displacement.

[0015] The technical advantages of this invention are as follows: 1. This invention uses a motor to drive a connected fine screw to rotate, thereby moving the round rod downwards or upwards. This achieves the effect of separating the round plug from the cylinder opening and closing it with the cylinder opening, which is beneficial for removing the circular mesh plate from the cylinder, facilitating the loading of dry ice, and realizing centralized and uniform heating and sublimation of the dry ice; 2. This invention uses spirally distributed internal steel pipes installed on the inner wall of the cylinder to surround the dry ice on the circular mesh plate. The internal steel pipes and the external steel pipes on both sides form a circulating pipe body, and the water in the external steel pipes is heated by an electromagnetic heating plate, which is beneficial for heating the circulating water, realizing the function of accelerating the sublimation of dry ice, and improving the processing efficiency; 3. This invention uses a peristaltic pump, which runs at a fast speed to realize the function of water circulation. The fast water flow speed can avoid the situation where the water flow is slow and ice forms and blocks the pipe body.

[0016] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of a cylinder in a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the right-hand round flat box of a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0020] Figure 4 This is a front view of the stacked component structure of a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0021] Figure 5 This is a top view of the stacked assembly structure of a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram showing the connection between the round rod and the thin screw in a dry ice heating and sublimation device for carbon dioxide flooding according to an embodiment of the present invention.

[0023] Reference numerals: 1. Cylinder, 2. Circular plug, 3. Lower ear plate, 4. Circular rod, 5. Right circular flat box, 6. Upper ear plate, 7. Bend, 8. Electric regulating valve, 9. Motor, 10. Left circular flat box, 11. Peristaltic pump, 12. Internal steel pipe, 13. Concave ring, 14. External steel pipe, 15. Electromagnetic heating plate, 16. Support frame, 17. Circular mesh plate, 18. Fine screw, 19. Screw hole. Detailed Implementation

[0024] Example 1

[0025] like Figures 1-6 As shown, a dry ice heating sublimation device for carbon dioxide flooding includes a cylinder 1, a sealing assembly, a stacking assembly, and a heating assembly. The top of the cylinder 1 is a closed end face, and a bent pipe 7 is connected to the center of the closed end face. The sealing assembly includes a circular plug 2, two lower ear plates 3, two circular rods 4, and two motors 9. The circular plug 2 is sealed to the lower end face of the cylinder 1. Two lower ear plates 3 are symmetrically installed on the annular side of the circular plug 2. The upper end faces of the two lower ear plates 3 are respectively fixedly connected to the circular rods 4. The top end faces of the two circular rods 4 are respectively provided with screw holes 19. A thin screw 18 is provided in the screw hole 19. The top of the thin screw 18 is connected to the output end of the motor 9. The stacking assembly... The component is located inside the cylinder 1 and includes a support frame 16 and multiple circular mesh plates 17. The support frame 16 is U-shaped, and the open end of the U-shape is fixedly connected to the upper end face of the circular plug 2. The circular mesh plates 17 are circular, and the circular surface is provided with multiple mesh holes. The multiple circular mesh plates 17 are equidistantly installed between the inner side walls of the support frame 16. The heating component includes a peristaltic pump 11, an electromagnetic heating plate 15, an external steel pipe 14 connected in sequence to the peristaltic pump 11, and an internal steel pipe 12. The internal steel pipe 12 is spiral-shaped and located between the inner wall of the cylinder 1 and the outer side of the support frame 16. The external steel pipe 14 is located on both sides of the annular side of the cylinder 1, and the electromagnetic heating plate 15 is provided on the outer side of the external steel pipe 14.

[0026] In actual use, the top end face of the round rod 4 of the present invention is provided with a screw hole 19, and a thin screw 18 is provided in the screw hole 19. The top of the thin screw 18 is connected to the output end of the motor 9. By running the motor 9 to drive the connected thin screw 18 to rotate, the round rod 4 connected by the screw hole 19 can be moved down or up, so as to achieve the effect of separating the round plug 2 connected by the lower ear plate 3 from the cylinder 1 opening and closing it with the cylinder 1 opening. This is beneficial to moving the round mesh plate 17 out of the cylinder, making it easier to put dry ice in and realize the centralized and uniform heating and sublimation of dry ice. Meanwhile, by installing spirally distributed internal steel pipes 12 on the inner ring wall of the cylinder 1, the dry ice on the circular mesh plate 17 can be surrounded. The internal steel pipes 12 and the external steel pipes 14 on both sides form a circulation pipe. The water in the external steel pipes 14 is heated by an electromagnetic heating plate 15, which is beneficial for heating the circulating water, realizing the function of accelerating the sublimation of dry ice and improving the processing efficiency. By running the peristaltic pump 11, the running speed is fast, realizing the function of water circulation. The fast water flow speed can avoid the situation where the water flow is slow and ice forms and blocks the pipe.

[0027] Example 2

[0028] Preferably, based on Embodiment 1, in this embodiment, the bend 7 is provided with an electric regulating valve 8.

[0029] In actual use, the bend 7 of the present invention is equipped with an electric regulating valve, which facilitates the rapid output of sublimated dry ice.

[0030] Example 3

[0031] Preferably, based on Embodiment 1 or Embodiment 2, in this embodiment, an upper ear plate 6 is provided directly above the two lower ear plates 3 and on the annular side of the circular plug block 2, and the motor 9 is fixedly installed on the upper part of the two upper ear plates 6 respectively.

[0032] In actual use, an upper ear plate 6 is provided directly above the two lower ear plates 3 and on the annular side of the round plug block 2. The motor 9 is fixedly installed on the upper part of the upper ear plate 6, ensuring that the output end of the motor 9 drives the round rod 4 in a concentric manner.

[0033] Example 4

[0034] Preferably, based on Embodiment 1 or Embodiment 4, in this embodiment, the lower opening of the cylinder 1 is provided with a concave ring 13, and the top of the circular plug 2 is provided with a circular protrusion that matches the shape of the concave ring 13.

[0035] In actual use, the lower opening of the cylinder 1 of the present invention is provided with a concave ring 13, and the top of the circular plug 2 is provided with a circular protrusion that matches the shape of the concave ring 13, so as to achieve a sealed connection between the circular plug 2 and the lower opening of the cylinder 1.

[0036] Example 5

[0037] Preferably, based on Embodiment 1 or Embodiment 5, in this embodiment, a left round flat box 10 and a right round flat box 5 are provided on the outer side of the upper part of the cylinder 1, and the electromagnetic heating plate 15 is provided at the bottom of the left round flat box 10 and the right round flat box 5, respectively. The external steel pipe 14 is located inside the left round flat box 10 and the right round flat box 5 and above the electromagnetic heating plate 15.

[0038] In actual use, the bottom of the left round flat box 10 and the right round flat box 5 of the present invention are respectively provided with electromagnetic heating plates 15, which are used to heat the water in the external steel pipe 14.

[0039] Example 6

[0040] Preferably, based on Embodiment 1 or Embodiment 6, in this embodiment, the number of the circular mesh plates 17 is 5, and the height of the cylinder 1 is greater than the length of the support frame 6.

[0041] In actual use, the height of the cylinder 1 of the present invention is greater than the length of the support frame 6, which can form a group with other cylinders 1 to increase the amount of dry ice processed.

[0042] Example 7

[0043] A method of using a dry ice heating and sublimation apparatus for carbon dioxide flooding, comprising the following steps, using any of the dry ice heating and sublimation apparatuses for carbon dioxide flooding as described above:

[0044] S1: The motor 9 drives the connected fine screw 18 to rotate, which moves the round rod 4 connected by the screw hole 19 downward. The round rod 4 drives the round plug 2 to disengage from the cylinder 1 opening, and the round mesh plate 17 is moved out of the cylinder 1. Dry ice is placed on the round mesh plate 17. Then the motor 9 reverses to close and seal the round plug 2 with the cylinder 1 opening.

[0045] S2: By installing spirally distributed built-in steel pipes 12 on the inner ring wall of the cylinder 1, the dry ice on the circular mesh plate 17 can be surrounded. The built-in steel pipes 12 and the external steel pipes 14 on both sides form a circulation pipe. The water in the external steel pipes 14 is heated by an electromagnetic heating plate 15. The water circulation is achieved by running the peristaltic pump 11, which accelerates the sublimation of dry ice.

[0046] S2: After the dry ice sublimates, it is discharged outward through the bend pipe 7 by the electric regulating valve 8 to carry out carbon dioxide oil displacement.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A dry ice heating and sublimation device for carbon dioxide flooding, characterized in that: The assembly includes a cylinder (1), a sealing component, a stacking component, and a heating component. The top of the cylinder (1) is a closed end face, and a bent pipe (7) is connected to the center of the closed end face. The sealing component includes a circular plug (2), two lower ear plates (3), two round rods (4), and two motors (9). The circular plug (2) is sealed to the lower end face of the cylinder (1). Two lower ear plates (3) are symmetrically installed on the annular side of the circular plug (2), and the round rods (4) are fixedly connected to the upper end faces of the two lower ear plates (3). The two round rods (4) have screw holes (19) on their top ends respectively. A thin screw (18) is provided in the screw hole (19). The top of the thin screw (18) is connected to the output end of the motor (9). The stacking assembly is located inside the cylinder (1) and includes a support frame (16) and multiple circular mesh plates (17). The support frame (16) is U-shaped, and the U-shaped opening end is fixedly connected to the upper end face of the round plug (2). The circular mesh plate (17) is circular, and the circular surface is provided with multiple mesh holes. The multiple circular mesh plates (17) are arranged in a circular shape. 7) The heating assembly is installed equidistantly between the two side walls of the support frame (16). The heating assembly includes a peristaltic pump (11), an electromagnetic heating plate (15), an external steel pipe (14) connected in sequence to the peristaltic pump (11), and an internal steel pipe (12). The internal steel pipe (12) is spiral-shaped and located between the inner wall of the cylinder (1) and the outer side of the support frame (16). The external steel pipe (14) is located on both sides of the annular side of the cylinder (1). An electromagnetic heating plate (15) is provided on the outer side of the external steel pipe (14). Above the lower ear plate (3) and on the annular side of the round plug (2), there is an upper ear plate (6). The motor (9) is fixedly installed on the upper part of the two upper ear plates (6). The upper outer side of the cylinder (1) is provided with a left round flat box (10) and a right round flat box (5). The bottom of the left round flat box (10) and the right round flat box (5) are respectively provided with electromagnetic heating plates (15). The external steel pipe (14) is located inside the left round flat box (10) and the right round flat box (5) and above the electromagnetic heating plate (15).

2. The dry ice heating and sublimation device for carbon dioxide flooding according to claim 1, characterized in that: An electric regulating valve (8) is provided on the bend (7).

3. The dry ice heating and sublimation device for carbon dioxide flooding according to claim 1, characterized in that: The lower opening of the cylinder (1) is provided with a concave ring (13), and the top of the circular plug (2) is provided with a circular protrusion that matches the shape of the concave ring (13).

4. The dry ice heating and sublimation device for carbon dioxide flooding according to claim 1, characterized in that: The number of circular mesh plates (17) is 5, and the height of the cylinder (1) is greater than the length of the support frame (16).

5. A method of using a dry ice heating and sublimation device for carbon dioxide flooding, comprising using the dry ice heating and sublimation device for carbon dioxide flooding as described in any one of claims 1 to 4, characterized in that: Includes the following steps: S1: By running the motor (9) to drive the connected fine screw (18) to rotate, the round rod (4) connected by the screw hole (19) is moved down, the round rod (4) drives the round plug (2) to disengage from the cylinder (1) and the round mesh plate (17) is moved out from the cylinder (1). Dry ice is placed on the round mesh plate (17), and then the motor (9) reverses to close and seal the round plug (2) with the cylinder (1) opening. S2: By installing spirally distributed built-in steel pipes (12) on the inner ring wall of the cylinder (1), the dry ice on the circular mesh plate (17) can be surrounded. The built-in steel pipes (12) and the external steel pipes (14) on both sides form a circulating pipe. The water in the external steel pipes (14) is heated by an electromagnetic heating plate (15). The water is circulated by running a peristaltic pump (11) to accelerate the sublimation of dry ice. S3: After the dry ice sublimates, it is discharged outward through the bend pipe (7) adjusted by the electric regulating valve (8) to carry out carbon dioxide oil displacement.

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