Quantitative injection device for carbon dioxide flooding

Abstract

The utility model relates to carbon dioxide oil displacement technical field discloses a kind of carbon dioxide oil displacement quantitative injection device, including tank, connecting pipe and protective cover, the outer wall of the front end of tank is connected through with connecting pipe, the rear end of connecting pipe is provided with action mechanism, the action mechanism includes two reset springs and slide bar, the upper end and the lower end of connecting pipe inner wall are fixedly connected with cross support, the upper end of reset spring is fixedly connected with movable rod, the lower end of cross support is all through cross support and fixedly connected with valve piece, the outer wall of slide bar body is slidably connected with tank, the front end of slide bar is fixedly connected with piston plate, and the piston plate slides in the inside of tank. In the utility model, by the opening and closing of valve piece in action mechanism, the movement of piston plate and the limit of moving block to limit block, reduce the fluctuation of injection amount, and by the threaded connection of threaded rod and moving block in adjusting mechanism, the carbon dioxide injection amount of each time is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide flooding technology, and in particular to a quantitative injection device for carbon dioxide flooding. Background Technology

[0002] Carbon dioxide flooding is a technology that uses a flooding device to inject carbon dioxide into the oil reservoir, thereby increasing the recovery rate of crude oil through its physical and chemical effects. This technology can also achieve underground carbon dioxide sequestration, thus having the dual value of increasing production and protecting the environment.

[0003] However, in order to achieve the best oil displacement effect, the amount of carbon dioxide injected needs to be strictly controlled. Currently, most existing carbon dioxide oil displacement injection devices on the market have large fluctuations in the amount of carbon dioxide injected during multiple injections, which can easily lead to insufficient or excessive injection. In addition, most existing carbon dioxide oil displacement injection devices on the market are not convenient to adjust the injection amount according to the amount of oil stored, which is quite inconvenient.

[0004] Therefore, those skilled in the art have provided a quantitative injection device for carbon dioxide flooding to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a quantitative injection device for carbon dioxide-driven oil recovery. By opening and closing two valve plates in the action mechanism, moving the piston plate, and limiting the movement of the moving block to the limiting block, fluctuations in the injection volume are reduced. Furthermore, by adjusting the threaded rod in the adjustment mechanism and threadedly connecting it to the moving block, the amount of carbon dioxide injected each time can be easily adjusted.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A quantitative injection device for carbon dioxide flooding includes a tank, a connecting pipe, and a protective cover. The outer wall of the front end of the tank is connected to the connecting pipe. An actuating mechanism is provided at the rear end of the connecting pipe. The actuating mechanism includes two return springs and a sliding rod. A cross bracket is fixedly connected to the upper and lower ends of the inner wall of the connecting pipe. A movable rod is fixedly connected to the upper end of each return spring. The lower end of each cross bracket passes through the cross bracket and is fixedly connected to a valve plate. The outer wall of the slide rod is slidably connected to the tank body. The front end of the slide rod is fixedly connected to a piston plate, which slides inside the tank body. The rear end of the slide rod is fixedly connected to a limiting block. The outer wall of the rear end of the tank body is fixedly connected to a protective cover. An adjustment mechanism is provided inside the protective cover. The adjustment mechanism includes a threaded rod and a movable block. A movable groove is provided on the top surface inside the protective cover. The outer wall of the threaded rod is threadedly connected to the movable block. The movable block slides inside the movable groove. An indicator block is fixedly connected to the outer wall of one side of the movable block. The above technical solution involves injecting carbon dioxide from above the connecting pipe, pushing open the upper valve plate and filling the tank. A sliding rod then pushes the piston plate forward for compression, pushing open the lower valve plate. A moving block limits the movement of the limiting block, maintaining a fixed piston plate movement distance and reducing fluctuations in the injection volume. Furthermore, a threaded rod connected to the moving block allows the rotating rod to drive the moving block forward or backward along the moving groove, changing the distance between the moving block and the limiting block, thus facilitating adjustments to the amount of carbon dioxide injected each time.

[0007] Furthermore, the upper ends of the cross brackets are all fixedly connected to the return springs, the outer walls of the movable rods are all slidably connected to the cross brackets, and sealing gaskets are fixedly connected to the upper edges of the valve plates, with the outer walls of the upper ends of the sealing gaskets tightly fitted to the connecting pipes. Through the above technical solution, when the pressure difference between the tank and the inside of the connecting pipe tends to be consistent by the return spring fixedly connected to the cross bracket, the elastic force of the return spring can push the movable rod to move, keeping the valve plate closed. The sealing gasket fixedly connected to the valve plate can fill the gap between the valve plate and the connecting pipe, improving the sealing performance. At the same time, the design of the valve plate and the connecting pipe being in contact prevents carbon dioxide from flowing back into the connecting pipe.

[0008] Furthermore, a sealing ring is fixedly connected to the middle of the outer wall of the piston plate, and the outer wall of the sealing ring is tightly fitted to the tank body; The above technical solution allows the sealing ring, which is fixedly connected to the outer wall of the piston plate, to fill the gap between the piston plate and the inner wall of the tank, preventing carbon dioxide from flowing to the rear of the piston plate.

[0009] Furthermore, a servo motor is installed in the cavity inside the limiting block. The output shaft of the servo motor passes through the limiting block and is fixedly connected to a gear. One side of the gear is rotatably connected to the limiting block. Through the above technical solution, the servo motor installed inside the cavity of the limiting block can drive the gear to rotate rapidly, and one side of the gear is rotatably connected to the limiting block, which makes the gear rotate more stably.

[0010] Furthermore, a rack is fixedly connected to the bottom surface inside the protective cover, and the lower end of the gear passes through the limiting block and meshes with the rack; Through the above technical solution, by meshing the rack and gear fixedly connected to the bottom surface inside the protective cover, the gear can drive the limiting block to push the piston plate to move inside the tank through the slide rod under the drive of the servo motor. When the piston plate is located at the rear end of the tank, the pressure inside the tank is low and the space is sufficient. When the piston plate moves forward, it can compress the carbon dioxide inside the tank and form a higher pressure.

[0011] Furthermore, flanges are fixedly connected to both the upper and lower ends of the connecting pipe, a PLC control panel is provided at the rear end of the outer wall of one side of the protective cover, a support frame is fixedly connected to the lower end of the tank, a button is provided on the inner wall of the rear end of the protective cover, and an electric bell is provided at the lower end of the outer wall of the rear end of the protective cover. Through the above technical solution, the flanges fixedly connected to the upper and lower ends of the connecting pipe, along with multiple bolts and nuts, can be connected to the external gas pipeline. The upper pipeline is used to connect the storage tank for storing carbon dioxide to the connecting pipe, and the lower pipeline is used to inject a metered amount of discharged carbon dioxide into the oil displacement device. The PLC control panel on the protective cover allows the staff to control the operating status of the device. At the same time, the support frame fixedly connected to the lower end of the tank can stabilize the entire device on the ground. In addition, by touching the button inside the protective cover, the limit block can activate the electric bell to remind the staff that the tank is full of carbon dioxide, and at the same time cut off the carbon dioxide supply from the upper gas pipeline.

[0012] Furthermore, the inner wall of the front end of the movable groove is rotatably connected to the threaded rod, and the rear end of the threaded rod passes through the protective cover and is fixedly connected to a handwheel; The above technical solution allows workers to easily rotate the threaded rod by using a handwheel fixedly connected to it. The threaded connection between the threaded rod and the moving block drives the moving block to move along the moving groove. By changing the position of the moving block, the limiting position of the moving block on the limiting block can be adjusted.

[0013] Furthermore, a groove is provided in the middle of one side of the outer wall of the protective cover, one side of the indicator block extends through the groove to the outside of the protective cover, and a scale strip is provided at the upper end of one side of the outer wall of the protective cover. The above technical solution allows staff to easily understand the adjustment of the injection volume by using an indicator block that is fixedly connected to the indicator block and extends through the protective cover. The scale strip on the protective cover facilitates quantification.

[0014] This utility model has the following beneficial effects: 1. The present invention proposes a quantitative injection device for carbon dioxide-driven oil production. Carbon dioxide is injected from above through the connecting pipe in the action mechanism. Due to the low pressure inside the tank, the carbon dioxide pushes open the upper valve plate and fills the tank. In conjunction with the slide rod, it pushes the piston plate forward to compress the pressure, which increases and pushes open the lower valve plate. The moving block limits the limiting block on the slide rod, keeping the moving distance of the piston plate fixed. This reduces the fluctuation of the amount of carbon dioxide injected each time and avoids the situation of injecting too much or too little.

[0015] 2. The present invention proposes a quantitative injection device for carbon dioxide-driven oil displacement. By adjusting the threaded rod in the mechanism and connecting it to the moving block, the rotating threaded rod can drive the moving block to move forward or backward along the moving groove, thereby changing the distance between the moving block and the limiting block. This allows the operator to adjust the amount of carbon dioxide injected each time according to the amount of oil stored. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a carbon dioxide flooding oil metering injection device proposed in this utility model; Figure 2 This is an exploded view of a carbon dioxide flooding oil metering injection device proposed in this utility model; Figure 3 This is a cross-sectional view of a carbon dioxide flooding oil metering injection device proposed in this utility model; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0017] Explanation of reference numerals in the attached figures: 1. Tank body; 2. Actuating mechanism; 201. Connecting pipe; 202. Cross bracket; 203. Return spring; 204. Moving rod; 205. Valve plate; 206. Sealing gasket; 207. Slide rod; 208. Piston plate; 209. Sealing ring; 210. Limiting block; 211. Servo motor; 212. Gear; 213. Rack; 3. Flange; 4. Adjusting mechanism; 401. Protective cover; 402. Moving groove; 403. Threaded rod; 404. Handwheel; 405. Moving block; 406. Slide groove; 407. Indicator block; 408. Scale bar; 5. Support frame; 6. PLC control panel; 7. Button; 8. Electric bell. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1-5 This utility model provides a specific implementation method: A quantitative injection device for carbon dioxide flooding includes a tank 1, a connecting pipe 201, and a protective cover 401. The outer wall of the front end of the tank 1 is connected to the connecting pipe 201. An actuating mechanism 2 is provided at the rear end of the connecting pipe 201. The actuating mechanism 2 includes two return springs 203 and a sliding rod 207. A cross bracket 202 is fixedly connected to the upper and lower ends of the inner wall of the connecting pipe 201. A movable rod 204 is fixedly connected to the upper end of each return spring 203. The lower end of the cross bracket 202 is connected to a valve plate 205 through the cross bracket 202. The outer wall of the slide rod 207 is slidably connected to the tank body 1. The front end of the slide rod 207 is fixedly connected to a piston plate 208, which slides inside the tank body 1. The rear end of the slide rod 207 is fixedly connected to a limiting block 210. The outer wall of the rear end of the tank body 1 is fixedly connected to a protective cover 401. An adjustment mechanism 4 is provided inside the protective cover 401. The adjustment mechanism 4 includes a threaded rod 403 and a moving block 405. A moving groove 402 is provided on the top surface inside the protective cover 401. The outer wall of the threaded rod 403 is threadedly connected to the moving block 405. The moving block 405 slides inside the moving groove 402. An indicator block 407 is fixedly connected to the outer wall of one side of the moving block 405.

[0020] Carbon dioxide is injected through the connecting pipe 201 in the action mechanism 2. Due to the low pressure inside the tank 1, the carbon dioxide pushes open the upper valve plate 205 and fills the tank 1. In conjunction with the slide rod 207, it pushes the piston plate 208 forward to compress it. The increased pressure pushes open the lower valve plate 205, and the moving block 405 limits the limiting block 210 on the slide rod 207 to keep the moving distance of the piston plate 208 fixed. This reduces the fluctuation of the amount of carbon dioxide injected each time and avoids the situation of injecting too much or too little. In addition, the threaded rod 403 in the adjustment mechanism 4 is threadedly connected to the moving block 405, so that the rotating threaded rod 403 can drive the moving block 405 to move forward or backward along the moving groove 402, changing the distance between the moving block 405 and the limiting block 210. This makes it easier for the staff to change the amount of carbon dioxide injected each time according to the amount of oil stored.

[0021] The upper ends of the cross brackets 202 are all fixedly connected to the return springs 203. The outer walls of the movable rods 204 are all slidably connected to the cross brackets 202. Sealing gaskets 206 are fixedly connected to the upper edge of the valve plates 205. The outer walls of the upper ends of the sealing gaskets 206 are tightly fitted to the connecting pipes 201. When the pressure difference between the tank 1 and the connecting pipes 201 is made to equalize by the return springs 203 fixedly connected to the cross brackets 202, the elastic force of the return springs 203 can push the movable rods 204 to move, keeping the valve plates 205 closed. The sealing gaskets 206 fixedly connected to the valve plates 205 can fill the gap between the valve plates 205 and the connecting pipes 201, improving the sealing performance. At the same time, the design of the valve plates 205 being in contact with the connecting pipes 201 prevents… To prevent backflow of carbon dioxide in the connecting pipe 201, a sealing ring 209 is fixedly connected to the middle of the outer wall of the piston plate 208. The outer wall of the sealing ring 209 is tightly fitted to the tank body 1. The sealing ring 209 fixedly connected to the outer wall of the piston plate 208 can fill the gap between the piston plate 208 and the inner wall of the tank body 1, preventing carbon dioxide from flowing to the rear of the piston plate 208. A servo motor 211 is installed in the cavity inside the limiting block 210. The output shaft of the servo motor 211 passes through the limiting block 210 and is fixedly connected to a gear 212. One side of the gear 212 is rotatably connected to the limiting block 210. The servo motor 211 installed in the cavity inside the limiting block 210 can drive the gear 212 to rotate rapidly, and one side of the gear 212 rotates with the limiting block 210. The connection allows gear 212 to rotate more stably. A rack 213 is fixedly connected to the bottom surface inside the protective cover 401. The lower end of gear 212 passes through the limiting block 210 and meshes with the rack 213. Through the meshing connection between the rack 213 fixedly connected to the bottom surface inside the protective cover 401 and gear 212, under the drive of servo motor 211, gear 212 can drive the limiting block 210 to push piston plate 208 to move inside tank 1 via slide rod 207. When piston plate 208 is located at the rear end of tank 1, the pressure inside tank 1 is low and the space is sufficient. When piston plate 208 moves forward, it can compress the carbon dioxide inside tank 1, forming a higher pressure. Flanges 3 are fixedly connected to both the upper and lower ends of connecting pipe 201 to ensure... A PLC control panel 6 is installed at the rear end of one side of the outer wall of the protective cover 401. A support frame 5 is fixedly connected to the lower end of the tank body 1. A button 7 is installed on the inner wall of the rear end of the protective cover 401, and an electric bell 8 is installed at the lower end of the outer wall of the rear end of the protective cover 401. The flange 3, fixedly connected to the upper and lower ends of the connecting pipe 201, can be connected to an external gas pipeline using multiple bolts and nuts. The upper pipeline connects the carbon dioxide storage tank to the connecting pipe 201, and the lower pipeline injects a measured amount of discharged carbon dioxide into the oil displacement device. The PLC control panel 6 on the protective cover 401 allows operators to control the operating status of the device. The support frame 5, fixedly connected to the lower end of the tank body 1, stabilizes the entire device on the ground.Touching the button 7 inside the protective cover 401 via the limiting block 210 activates the electric bell 8 to alert staff that the tank 1 is full of carbon dioxide, and simultaneously cuts off the carbon dioxide supply from the upper gas pipeline. The inner wall of the front end of the moving trough 402 is rotatably connected to the threaded rod 403. The rear end of the threaded rod 403 passes through the protective cover 401 and is fixedly connected to a handwheel 404. The handwheel 404 fixedly connected to the threaded rod 403 allows staff to easily rotate the threaded rod 403. The threaded connection between the threaded rod 403 and the moving block 405 drives the moving block 405 along... The movable slot 402 moves, and the position of the movable block 405 is adjusted by changing its position to limit the restricting position of the restricting block 210. A sliding groove 406 is provided in the middle of one side of the outer wall of the protective cover 401. One side of the indicator block 407 extends through the sliding groove 406 to the outside of the protective cover 401. A scale strip 408 is provided at the upper end of one side of the outer wall of the protective cover 401. The indicator block 407, fixedly connected to the indicator block 407, extends through the protective cover 401, and, in conjunction with the scale strip 408 on the protective cover 401, facilitates the operator's understanding of the injection volume adjustment, enabling quantification.

[0022] Working Principle: When using this carbon dioxide-assisted oil displacement metering injection device, the operator first connects it to the external gas pipeline using bolts and nuts and flange 3. The upper delivery pipeline connects the carbon dioxide storage tank to the connecting pipe 201, while the lower delivery pipeline injects the metered carbon dioxide into the oil displacement device. Then, the operator powers the device with an external power source and rotates the threaded rod 403 via handwheel 404, causing the moving block 405 to move the indicator block 407. Using the scale bar 408, the moving block 405 is stopped at the desired position, thus adjusting the carbon dioxide injection volume. Next, the solenoid valve on the storage tank is opened via the PLC control panel 6, allowing carbon dioxide to be injected from above the connecting pipe 201. At this time, the pressure inside the tank 1 is low, and the upper valve plate 205 is pushed open. The carbon dioxide pushes the piston plate 208 backward, filling the tank 1. Then, when the slide rod 207 pushes the limiting block 210 backward and presses against the button 7, the electric bell 8 is energized to indicate that the tank 1 is full. At the same time, an electrical signal is sent to the PLC control panel 6 to close the solenoid valve on the storage tank, stopping the carbon dioxide injection. Finally, the servo motor 211 is started using the PLC control panel 6 to drive the gear 212 to rotate. The gear 212 meshes with the rack 213, allowing the limiting block 210 to push the piston plate 208 forward via the slide rod 207 for compression. At this time, the pressure increases, pushing open the lower valve plate 205 and injecting it into the oil driving device through the lower gas pipeline. The moving block 405 limits the limiting block 210, keeping the moving distance of the piston plate 208 fixed and reducing the fluctuation of the amount of carbon dioxide injected each time.

[0023] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0024] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quantitative injection device for carbon dioxide flooding, comprising a tank (1), a connecting pipe (201), and a protective cover (401), characterized in that: The outer wall of the front end of the tank (1) is connected to the connecting pipe (201). The rear end of the connecting pipe (201) is provided with an action mechanism (2). The action mechanism (2) includes two return springs (203) and a slide rod (207). The upper and lower ends of the inner wall of the connecting pipe (201) are fixedly connected with cross brackets (202). The upper ends of the return springs (203) are fixedly connected with movable rods (204). The lower end of each cross bracket (202) passes through the cross bracket (202) and is fixedly connected to a valve plate (205). The outer wall of the slide rod (207) is slidably connected to the tank body (1). The front end of the slide rod (207) is fixedly connected to a piston plate (208). The piston plate (208) slides inside the tank body (1). The rear end of the slide rod (207) is fixedly connected to a limiting block (210). The outer wall of the rear end of the tank body (1) is fixedly connected to a protective cover (401). An adjustment mechanism (4) is provided inside the protective cover (401). The adjustment mechanism (4) includes a threaded rod (403) and a moving block (405). The top surface inside the protective cover (401) is provided with a moving groove (402). The outer wall of the threaded rod (403) is threadedly connected to the moving block (405). The moving block (405) slides inside the moving groove (402). An indicator block (407) is fixedly connected to the outer wall of one side of the moving block (405).

2. The quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The upper end of each cross bracket (202) is fixedly connected to the return spring (203), the outer wall of each movable rod (204) is slidably connected to the cross bracket (202), and a sealing gasket (206) is fixedly connected to the upper edge of each valve plate (205). The outer wall of the upper end of each sealing gasket (206) is tightly fitted to the connecting pipe (201).

3. The quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: A sealing ring (209) is fixedly connected to the middle of the outer wall of the piston plate (208), and the outer wall of the sealing ring (209) is tightly fitted to the tank body (1).

4. The quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: A servo motor (211) is installed in the cavity inside the limiting block (210). The output shaft of the servo motor (211) passes through the limiting block (210) and is fixedly connected to a gear (212). One side of the gear (212) is rotatably connected to the limiting block (210).

5. A quantitative injection device for carbon dioxide flooding according to claim 4, characterized in that: A rack (213) is fixedly connected to the bottom surface inside the protective cover (401), and the lower end of the gear (212) passes through the limiting block (210) and meshes with the rack (213).

6. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The upper and lower ends of the connecting pipe (201) are fixedly connected to flanges (3), the rear end of the outer wall of the protective cover (401) is provided with a PLC control panel (6), the lower end of the tank (1) is fixedly connected with a support frame (5), the inner wall of the rear end of the protective cover (401) is provided with a button (7), and the lower end of the outer wall of the rear end of the protective cover (401) is provided with an electric bell (8).

7. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: The inner wall of the front end of the movable groove (402) is rotatably connected to the threaded rod (403), and the rear end of the threaded rod (403) passes through the protective cover (401) and is fixedly connected to a handwheel (404).

8. A quantitative injection device for carbon dioxide flooding according to claim 1, characterized in that: A groove (406) is provided in the middle of one side of the outer wall of the protective cover (401). One side of the indicator block (407) passes through the groove (406) to the outside of the protective cover (401). A scale strip (408) is provided at the upper end of one side of the outer wall of the protective cover (401).

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