A composite fluid alternating injection device for developing heavy oil reservoirs by using multi-component thermal fluids

Abstract

The present application relates to injection device technical field, especially to a kind of composite fluid alternate injection device for multi-element thermal fluid development of thick oil reservoir, including injection hopper and the injection pipe being set below injection hopper and being interconnected, further including rotating cylinder, the rotating cylinder is set on injection hopper, several cavities are provided in rotating cylinder, several the cavity stores different kinds of thermal fluid respectively, each cavity is located at the two ends of rotating cylinder and is provided with the external pipe and injection mechanism being communicated with cavity respectively, when using, by switching mechanism and switch mechanism are mutually matched, the cavity for switching internal storage required thermal fluid is realized, and by switch mechanism, injection tank is injected with the corresponding injection mechanism, and the rest of injection mechanism is kept closed, the injection of required thermal fluid is accurately controlled, by constantly alternating injection fluid, the property of crude oil in thick oil reservoir is gradually improved, and flowability is continuously improved, so as to realize the effective development of thick oil reservoir, and improve the recovery rate of crude oil.

Description

Technical Field

[0001] This invention relates to the field of injection device technology, and in particular to a composite fluid alternating injection device for the development of multiple thermal fluids in heavy oil reservoirs. Background Technology

[0002] Heavy oil, as an important component of petroleum resources, is far more difficult to extract than conventional crude oil due to its high viscosity and low fluidity. Efficient development of heavy oil resources is crucial for ensuring energy supply security. Multi-fluid extraction technology, which injects various thermal fluids into heavy oil reservoirs to reduce crude oil viscosity through heat transfer and improve reservoir displacement efficiency, has become one of the key technologies for heavy oil extraction.

[0003] In traditional heavy oil reservoir multi-fluid development, different types of thermal fluids are often injected alternately to achieve optimal thermal recovery. However, in practical applications, currently widely used composite fluid injection devices have certain limitations and cannot effectively achieve precise and efficient alternating injection of multiple fluids. This not only affects thermal recovery efficiency but also increases development costs and prolongs the development cycle. Summary of the Invention

[0004] The technical problem this invention aims to solve is that, in the traditional development of multiple thermal fluids in heavy oil reservoirs, it is often necessary to alternately inject different types of thermal fluids to achieve optimal thermal recovery. However, in practical applications, currently widely used composite fluid injection devices have certain limitations and cannot effectively achieve the problem of precise and efficient alternating injection of multiple fluids. Therefore, this invention provides a composite fluid alternating injection device for the development of multiple thermal fluids in heavy oil reservoirs.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a composite fluid alternating injection device for the development of multiple thermal fluids in heavy oil reservoirs, including an injection bucket and an injection pipe disposed below the injection bucket and interconnected with each other, and a rotating cylinder disposed on the injection bucket. The rotating cylinder is provided with a plurality of cavities, each of which stores different types of thermal fluids. Each cavity is provided with an external pipe and an injection mechanism at both ends of the rotating cylinder. The external pipe on each cavity is connected to an external thermal fluid. The injection bucket is provided with an injection groove opposite to the injection mechanism. A switching mechanism is provided between the rotating cylinder and the injection bucket. The switching mechanism is used to control the displacement of the rotating cylinder and make one of the injection mechanisms on the plurality of cavities correspond to the injection groove. Each injection mechanism includes an injection shell and a sealing cylinder. One end of the injection shell is connected to its corresponding cavity, and the other end of the injection shell is provided with a discharge hole. The sealing cylinder is slidably disposed within the injection shell and is used to open or close the discharge hole. A switching mechanism is provided between the injection shell and the sealing cylinder. The switching mechanism is used to open the discharge hole of the sealing cylinder and connect the injection mechanism to the injection groove when one of the injection shells corresponds to the injection groove, and to close the discharge hole of the sealing cylinder when the remaining injection shells are misaligned with the injection groove. Compared with the prior art, this solution achieves the switching of the cavity storing the required hot fluid by cooperating with the switching mechanism. The switching mechanism connects the injection groove to the corresponding injection mechanism, while the remaining injection mechanisms remain closed, achieving precise control of the injection of the required fluid. Through continuous alternating injection of fluid, the properties of crude oil in the heavy oil reservoir are gradually improved, and the fluidity is continuously increased, thereby achieving effective development of the heavy oil reservoir and improving the crude oil recovery rate.

[0006] To implement the switching mechanism, in some preferred embodiments, the switching mechanism includes an upper magnetic component and a lower magnetic component arranged opposite to each other. The upper magnetic component is disposed on the sealing cylinder, and the lower magnetic component is disposed on the injection hopper. The lower magnetic component is arranged along several displacement directions of the injection mechanism. The lower magnetic component has a first polarity and a second polarity with different magnetic properties. The first polarity is disposed at the injection groove, and the polarity of the upper magnetic component is the same as the first polarity. By controlling the sliding of the sealing cylinder on the injection shell through the principle of like poles repelling and unlike poles attracting, the material discharge hole can be opened or closed. This allows for precise control of the injection time and injection volume of each fluid, providing a reliable guarantee for achieving precise alternating injection of fluids.

[0007] To implement the lower magnetic component, in some preferred embodiments, the lower magnetic component includes a first magnet and a second magnet with different magnetic properties. The first magnet and the second magnet form a ring structure. The first magnet has an oblong groove, which corresponds to the injection groove. By forming a ring structure with the first magnet and the second magnet, and by providing an oblong groove on the first magnet that corresponds to the injection groove, the two are connected to each other when the injection mechanism is in contact with the injection groove.

[0008] In order to enable the sealing cylinder to slide within the injection shell, in some preferred embodiments, the sealing cylinder is provided with a slider, the injection shell is provided with a groove, the groove matches the slider, and the slider is disposed within the groove.

[0009] In some preferred embodiments, the upper magnetic component is disposed on the slider.

[0010] In some preferred embodiments, the slider is provided with a groove that matches the lower magnetic component, and the lower magnetic component is disposed in the groove.

[0011] In some preferred embodiments, the injection tube includes a plurality of feed tubes, which are connected sequentially to each other.

[0012] To implement the switching mechanism, in some preferred embodiments, the switching mechanism includes a switching motor, the rotating cylinder is rotatably mounted on the injection hopper, the switching motor is fixedly mounted on the injection hopper, and the output end of the switching motor is connected to the rotating cylinder through a gear set.

[0013] The beneficial effects of this invention are as follows: The compound fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs, as described in this invention, utilizes a switching mechanism and a switching mechanism to switch the internal cavity storing the required thermal fluid. The switching mechanism connects the injection tank to the corresponding injection mechanism, while the remaining injection mechanisms remain closed. This allows for precise control of the injection of the required fluids. Through continuous alternating injection, the properties of the crude oil in the heavy oil reservoir are gradually improved, and its fluidity is continuously enhanced, thereby achieving effective development of the heavy oil reservoir and increasing the crude oil recovery rate. This avoids the need for alternating injection of different types of thermal fluids in traditional heavy oil reservoir multi-thermal fluid development processes to achieve optimal thermal recovery. However, in practical applications, currently widely used compound fluid injection devices have certain limitations and cannot effectively achieve precise and efficient alternating injection of multiple fluids. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the injection bucket and injection tube in this invention; Figure 3 This is a three-dimensional structural diagram of the lower magnetic component in this invention; Figure 4 This is a three-dimensional structural schematic diagram of the rotating cylinder in this invention; Figure 5 This is a schematic diagram of the internal structure of the injection mechanism in this invention; Figure 6 This is a schematic diagram of the injected structure in this invention.

[0016] In the diagram: 1. Injection hopper, 2. Injection pipe, 3. Rotating cylinder, 4. Outer pipe, 5. Injection mechanism, 6. Injection groove, 7. Injection shell, 8. Sealing cylinder, 9. Material discharge hole, 10. Upper magnetic component, 11. Lower magnetic component, 12. First magnet, 13. Second magnet, 14. Waist-shaped groove, 15. Sliding block, 16. Slide groove, 17. Conveying pipe, 18. Switching motor. Detailed Implementation

[0017] like Figure 1-6 As shown, a composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs includes an injection hopper 1, an injection pipe 2, and a rotating cylinder 3. The injection pipe 2 is located below the injection hopper 1 and is interconnected with each other. The rotating cylinder 3 is rotatably located above the injection hopper 1. The rotating cylinder 3 has four cavities. In this embodiment, four cavities are provided as an example. Two, three, or more cavities can be provided according to actual needs. The four cavities store different types of thermal fluids, such as steam, nitrogen, carbon dioxide, etc. Each cavity is located at both ends of the rotating cylinder 3 and is provided with an external pipe 4 and an injection mechanism 5 that are connected to the cavity. The external pipe 4 on each cavity is connected to the external thermal fluid. The injection hopper 1 is provided with an injection groove 6 that is opposite to the injection mechanism 5. A switching mechanism is provided between the rotating cylinder 3 and the injection hopper 1. The switching mechanism is used to control the rotation of the rotating cylinder 3 so that one of the injection mechanisms 5 on the four cavities corresponds to the injection groove 6, and the other three injection mechanisms 5 are staggered from the injection groove 6. Each injection mechanism 5 includes an injection shell 7 and a sealing cylinder 8. One end of the injection shell 7 is connected to its corresponding cavity, and the other end of the injection shell 7 is provided with a discharge hole 9. A slider 15 is provided on the sealing cylinder 8, and a groove 16 is provided on the injection shell 7. The groove 16 matches the slider 15, and the slider 15 is set in the groove 16 to realize the sliding of the sealing cylinder 8 in the injection shell 7. The sealing cylinder 8 is used to open or close the discharge hole 9. A switching mechanism is provided between the injection shell 7 and the sealing cylinder 8. The switching mechanism is used to move the sealing cylinder 8 upward when one of the injection shells 7 corresponds to the injection groove 6, so that the discharge hole 9 is opened, realizing the connection between the injection mechanism 5 and the injection groove 6. When the other three injection shells 7 are misaligned with the injection groove 6, the sealing cylinder 8 will close the discharge hole 9. At this time, the sealing cylinder 8 in the other three injection shells 7 is in the lower position, so that the sealing cylinder 8 blocks the discharge hole 9.

[0018] The switching mechanism includes an upper magnetic component 10 and a lower magnetic component 11 arranged opposite to each other. The upper magnetic component 10 is disposed on the sealing cylinder 8, and the lower magnetic component 11 is disposed on the injection hopper 1. The lower magnetic component 11 is arranged along the displacement direction of several injection mechanisms 5. The lower magnetic component 11 has a first polarity and a second polarity with different magnetic properties. The first polarity is disposed at the injection groove 6. The polarity of the upper magnetic component 10 is the same as the first polarity. For example, if the first polarity is the S pole and the second polarity is the N pole, then the upper magnetic component 10 is the S pole.

[0019] The lower magnetic component 11 includes a first magnet 12 and a second magnet 13 with different magnetic properties. The first magnet 12 and the second magnet 13 form a ring structure. The first magnet 12 is provided with a waist-shaped groove 14, which is correspondingly provided with the injection groove 6. The upper magnetic component 10 is provided on the slider 15. The slider 15 is provided with a groove that matches the lower magnetic component 11. The lower magnetic component 11 is provided in the groove.

[0020] The injection tube 2 includes two sections of conveying tube 17, which are connected in sequence. In this embodiment, two sections are used as an example. Of course, according to practical needs, three, four or better sections can be set.

[0021] The switching mechanism includes a switching motor 18, a rotating cylinder 3 rotatably mounted on an injection hopper 1, a switching motor 18 fixedly mounted on an injection hopper 1, and a gear set connecting the output end of the switching motor 18 to the rotating cylinder 3 for transmission. A large gear ring is mounted on the rotating cylinder 3, and a small gear is provided on the output end of the switching motor 18. The large gear ring and the small gear mesh with each other.

[0022] Its working principle is as follows: First, the feed pipe 17 is inserted into the hole pre-set during the development of the multi-electrothermal fluid in the heavy oil reservoir. Then, the fluid to be injected is connected to the outside through four external pipes 4. After that, the switching motor 18 is started. The output end of the switching motor 18 drives the small gear to rotate, which drives the large gear ring to rotate, thereby driving the rotating cylinder 3 to rotate, which in turn drives the four cavities to rotate. This causes the injection shells 7 at the bottom of the four cavities to move alternately to the top of the injection tank 6. When the injection shell 7 moves to the top of the injection tank 6, the first polarity on the lower magnetic component 11 applies an upward repulsive force to the upper magnetic component 10, causing the slider 15 to slide in the groove 16. This causes the sealing cylinder 8 to move upward, so that the sealing cylinder 8 moves upward at the discharge hole 9 inside the injection shell 7, so that the sealing cylinder 8 stops blocking the discharge hole 9, allowing the fluid to pass through the discharge hole 9 and then enter the injection hopper 1. Then, the fluid is discharged into the pre-set hole through the feed pipe 17. By switching different cavities through the switching structure, the fluid is injected alternately into the heavy oil reservoir. The alternating injection method allows different fluids to fully play their respective roles in the reservoir and work together to produce better development results. Through continuous alternating injection of fluids, the properties of crude oil in the heavy oil reservoir are gradually improved and the fluidity is continuously improved, thereby realizing the effective development of the heavy oil reservoir and improving the recovery rate of crude oil. In addition, when the injection shell 7 passes through the injection groove 6, it will pass above the lower magnetic component 11. The lower magnetic component 11 exerts an attraction on the upper magnetic component 10, causing the slider 15 to move downward and the sealing cylinder 8 to move downward. The sealing cylinder 8 seals the drop hole 9, which can precisely control the injection time and injection volume of each fluid, providing a reliable guarantee for the precise alternating injection of fluids.

[0023] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs, comprising an injection hopper (1) and an injection pipe (2) disposed below the injection hopper (1) and interconnected with it, characterized in that: It also includes a rotating cylinder (3), which is set on the injection hopper (1). The rotating cylinder (3) has several cavities, which store different kinds of hot fluids. Each cavity is provided with an external pipe (4) and an injection mechanism (5) communicating with the cavity at both ends of the rotating cylinder (3). The external pipe (4) on each cavity is connected to the external hot fluid. The injection hopper (1) is provided with an injection groove (6) opposite to the injection mechanism (5). A switching mechanism is provided between the rotating cylinder (3) and the injection hopper (1). The switching mechanism is used to control the displacement of the rotating cylinder (3) and make one of the injection mechanisms (5) on the several cavities correspond to the injection groove (6). Each of the injection mechanisms (5) includes an injection shell (7) and a sealing cylinder (8). One end of the injection shell (7) is connected to its corresponding cavity, and the other end of the injection shell (7) is provided with a discharge hole (9). The sealing cylinder (8) is slidably disposed in the injection shell (7) and is used to open or close the discharge hole (9). A switching mechanism is provided between the injection shell (7) and the sealing cylinder (8). The switching mechanism is used to open the discharge hole (9) and connect the injection mechanism (5) with the injection groove (6) when one of the injection shells (7) corresponds to the injection groove (6), and to close the discharge hole (9) when the other injection shells (7) are misaligned with the injection groove (6).

2. The composite fluid alternating injection device for developing multi-element thermal fluids in heavy oil reservoirs according to claim 1, characterized in that: The switching mechanism includes an upper magnetic component (10) and a lower magnetic component (11) arranged opposite to each other. The upper magnetic component (10) is arranged on the sealing cylinder (8), and the lower magnetic component (11) is arranged on the injection hopper (1). The lower magnetic component (11) is arranged along the displacement direction of several injection mechanisms (5). The lower magnetic component (11) has a first polarity and a second polarity with different magnetic properties. The first polarity is arranged at the injection groove (6), and the polarity of the upper magnetic component (10) is the same as the first polarity.

3. The composite fluid alternating injection device for developing multi-element thermal fluids in heavy oil reservoirs according to claim 2, characterized in that: The lower magnetic component (11) includes a first magnet (12) and a second magnet (13) with different magnetic properties. The first magnet (12) and the second magnet (13) form a ring structure. The first magnet (12) is provided with a waist-shaped groove (14), which is correspondingly provided with the injection groove (6).

4. A composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs according to claim 2 or 3, characterized in that: The sealing cylinder (8) is provided with a slider (15), and the injection shell (7) is provided with a groove (16). The groove (16) matches the slider (15), and the slider (15) is located in the groove (16).

5. The composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs according to claim 4, characterized in that: The upper magnetic component (10) is disposed on the slider (15).

6. A composite fluid alternating injection device for developing multi-element thermal fluids in heavy oil reservoirs according to claim 5, characterized in that: The slider (15) is provided with a groove that matches the lower magnetic component (11), and the lower magnetic component (11) is disposed in the groove.

7. The composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs according to claim 1, characterized in that: The injection tube (2) includes a plurality of feed tubes (17), which are connected in sequence.

8. The composite fluid alternating injection device for developing multiple thermal fluids in heavy oil reservoirs according to claim 1, characterized in that: The switching mechanism includes a switching motor (18), the rotating cylinder (3) is rotatably mounted on the injection hopper (1), the switching motor (18) is fixedly mounted on the injection hopper (1), and the output end of the switching motor (18) is connected to the rotating cylinder (3) by a gear set.

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