Micro-bubble solid acid slow-release fracturing device and use method thereof

Abstract

The invention belongs to the technical field of oil and gas development, and particularly relates to a microbubble solid acid slow-release fracturing device and a using method thereof.The microbubble solid acid slow-release fracturing device comprises an acid liquid tank, the output end of the acid liquid tank is in through connection with one end of a first conveying pipe, the other end of the first conveying pipe is in through connection with the input end of a low-pressure manifold, and a liquid supply pump is arranged on the first conveying pipe; the output end of the low-pressure manifold is connected with one end of a second conveying pipe in a penetrating mode, the other end of the second conveying pipe is connected with the input end of a fracturing truck in a penetrating mode, the output end of the fracturing truck is connected with one end of a third conveying pipe in a penetrating mode, and the other end of the third conveying pipe is connected with the input end of the high-pressure manifold in a penetrating mode. The mixed solution is subjected to foam particle size refining through the high-pressure micro-foam generator, the stability of foam can be remarkably improved, the stable foam can keep the form in a high-pressure environment and is not prone to breakage, and therefore the pressure bearing capacity of the fracturing fluid is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas development, and specifically refers to a microbubble solid acid slow-release fracturing device and a use method thereof. Background Art

[0002] In the development of oil and gas fields, foam acid fracturing technology is an important means of increasing production and is widely used to improve reservoir permeability and oil and gas recovery rates. Conventional foam acid fracturing mixes a foaming agent with an acid solution and simply disperses it with gas under high pressure conditions to form a foam fluid that is injected into the formation. This technology utilizes the expansion and sand-carrying capacity of foam to effectively increase the complexity and surface area of ​​the fracture network.

[0003] However, conventional foam acid fracturing has significant defects: foam fluids often show poor stability in actual applications and are easily affected by complex geological conditions such as formation temperature, mineralization, pH, and oil content, resulting in rapid foam collapse and inability to maintain effective fracturing effects for a long time. In addition, the lack of foam stability also limits the further improvement of the production increase effect after fracturing, becoming a key bottleneck restricting the widespread application of this technology. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a microbubble solid acid slow-release fracturing device and a method of using the same.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a microbubble solid acid slow-release fracturing device, comprising an acid liquid tank, the output end of the acid liquid tank is connected through one end of a delivery pipe one, the other end of the delivery pipe one is connected through the input end of a low-pressure manifold, the delivery pipe one is provided with a liquid supply pump, the output end of the low-pressure manifold is connected through one end of a delivery pipe two, the other end of the delivery pipe two is connected through the input end of a fracturing vehicle, the output end of the fracturing vehicle is connected through one end of a delivery pipe three, the other end of the delivery pipe three is connected through the input end of a high-pressure manifold, the output end of the high-pressure manifold is connected through one end of a high-pressure tee, the other end of the high-pressure tee is connected through the input end of a high-pressure microbubble generator, the lower end of the high-pressure tee is connected through a liquid nitrogen pump, the side wall of the low-pressure manifold is connected through the output end of a proportional pump, and the input end of the proportional pump is connected through the output end of a foaming agent and a solid particle acid mixing tank.

[0006] Furthermore, the high-pressure microbubble generator includes a shell, one end of the shell is provided with a liquid outlet, the other end of the shell is provided with a liquid inlet, the liquid inlet is connected to the other end of the high-pressure tee, one end of the interior of the shell is provided with a shear spoiler plate 1, one side of the shear spoiler plate 1 is provided with a right spiral spoiler fluid, one side of the right spiral spoiler fluid is provided with a shear spoiler plate 2, and one side of the shear spoiler plate 2 is provided with a left spiral spoiler fluid.

[0007] Furthermore, the liquid nitrogen pump is externally connected to liquid nitrogen.

[0008] This solution also discloses a method for using a microbubble solid acid slow-release fracturing device, which mainly includes the following steps:

[0009] Step 1: The acid solution in the acid liquid tank is input into the low-pressure header through the liquid supply pump, and the mixed solution of the foaming agent and the solid particle acid in the foaming agent and solid particle acid mixing tank is transported to the low-pressure header through the proportional pump;

[0010] Step 2: After merging with the acid solution, enter the soil fracturing truck, enter the delivery pipe 3 through the output end of the fracturing truck, enter the high-pressure tee through the high-pressure manifold, and the liquid nitrogen pump is connected to liquid nitrogen. After merging with the foaming agent, solid granular acid and acid solution, it enters the high-pressure microbubble generator;

[0011] Step 3: Use a high-pressure microbubble generator to refine the foam particle size to form a microbubble acid solution with good stability, high pressure resistance and strong sand-carrying capacity, which is then injected into the wellhead. The sand-carrying capacity of the microbubble acid brings a certain amount of microparticles into the reservoir and embeds them into the cracks. After the granular acid is slowly released, it will corrode densely connected potholes on the surface of the cracked rock, forming a backflow channel.

[0012] The beneficial effects achieved by the present invention using the above structure are as follows:

[0013] (1) The foam particle size of the mixed solution is refined by a high-pressure microbubble generator, which can significantly improve the stability of the foam. Stable foam can maintain its shape under high pressure and is not easy to break, thereby enhancing the pressure-bearing capacity of the fracturing fluid.

[0014] (2) The formed microbubble acid solution is not only stable but also has high pressure resistance, which means that it can better resist the formation pressure during the fracturing process and ensure the fracturing effect.

[0015] (3) Microbubble acid has a significant sand-carrying capacity and can effectively bring a certain amount of microparticles into the reservoir and embed them into the cracks. These microparticles play a supporting role in the cracks, preventing them from closing and increasing the complexity and surface area of ​​the cracks.

[0016] (4) After the granular acid is slowly released, densely connected pits are corroded on the surface of the fractured rock. These pits not only increase the conductivity of the fracture, but also form more complex backflow channels, which are beneficial to the flow and exploitation of oil and gas resources.

[0017] (5) The slow-release corrosion effect of granular acid on the surface of fractured rocks can form more uniform corrosion pits, which are interconnected to form efficient oil and gas flow channels.

[0018] (6) By improving the permeability and conductivity of the reservoir, this fracturing device can significantly increase the production of oil or gas wells. At the same time, due to the complexity of the fractures and the increase in surface area, the efficiency of oil and gas resource extraction is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of a microbubble solid acid slow-release fracturing device of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of a high-pressure microbubble generator;

[0022] Figure 3 Schematic diagram of the structure of a shear spoiler;

[0023] Figure 4 This is the front view of the left-handed spiral disturber;

[0024] Figure 5 This is the front view of the right-hand spiral disruptor.

[0025] Among them, 1. Acid tank, 2. Liquid supply pump, 3. Low-pressure manifold, 4. Fracturing truck, 5. High-pressure manifold, 6. High-pressure tee, 7. Liquid nitrogen pump, 8. High-pressure microbubble generator, 10. Proportional pump, 12. Foaming agent and solid particle acid mixing tank, 14. Shear spoiler 1, 15. Shear spoiler 2, 16. Left-hand spiral spoiler, 17. Right-hand spiral spoiler, 18. Shell, 19. Liquid outlet, 20. Liquid inlet, 21. Delivery pipe 1, 22. Delivery pipe 2, 23. Delivery pipe 3. (Note: 9 and 13 are not shown in the figure, so there is no need to mention them. The proportions have been deleted) DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0027] like Figure 1-Figure 5As shown, the present invention proposes a microbubble solid acid slow-release fracturing device, including an acid liquid tank 1, the output end of the acid liquid tank 1 is connected to one end of a delivery pipe 21, the other end of the delivery pipe 21 is connected to the input end of a low-pressure manifold 3, the delivery pipe 21 is provided with a liquid supply pump 2, the output end of the low-pressure manifold 3 is connected to one end of a delivery pipe 22, the other end of the delivery pipe 22 is connected to the input end of a fracturing vehicle 4, the output end of the fracturing vehicle 4 is connected to one end of a delivery pipe 3 23, the other end of the delivery pipe 3 23 is connected to the input end of a high-pressure manifold 5, the output end of the high-pressure manifold 5 is connected to one end of a high-pressure tee 6, the other end of the high-pressure tee 6 is connected to the input end of a high-pressure microbubble generator 8, and the high The high-pressure microbubble generator 8 includes a shell 18, one end of which is provided with a liquid outlet 19, the other end of which is provided with a liquid inlet 20, the liquid inlet 20 is connected to the other end of the high-pressure tee 6, one end of the interior of the shell 18 is provided with a shear spoiler 14, one side of the shear spoiler 14 is provided with a right-hand spiral spoiler body 17, one side of the right-hand spiral spoiler body 17 is provided with a shear spoiler 2 15, one side of the shear spoiler 2 15 is provided with a left-hand spiral spoiler body 16, the lower end of the high-pressure tee 6 is connected to a liquid nitrogen pump 7, the liquid nitrogen pump 7 is externally connected to liquid nitrogen, the side wall of the low-pressure manifold 3 is connected to the output end of the proportional pump 10, and the input end of the proportional pump 10 is connected to the output end of the foaming agent and the solid particle acid mixing tank 12.

[0028] During specific use, the acid solution in the acid liquid tank 1 is input into the low-pressure manifold 3 through the liquid supply pump 2, and the mixed solution of the foaming agent and solid particle acid in the foaming agent and solid particle acid mixing tank 12 is transported to the low-pressure manifold 3 through the proportional pump 10, and after merging with the acid solution, it enters the soil fracturing vehicle 4, and is input into the delivery pipe three 23 through the output end of the fracturing vehicle 4, and enters the high-pressure tee 6 through the high-pressure manifold 5. The liquid nitrogen pump 7 is externally connected with liquid nitrogen, and after merging with the foaming agent, solid particle acid and acid solution, it enters the high-pressure microbubble generator 8, and the foam particle size is refined by the high-pressure microbubble generator 8 to form a microbubble acid solution with good stability, high pressure bearing and strong sand carrying capacity, which is then injected into the wellhead. The sand carrying capacity of the microbubble acid brings a certain amount of microparticles into the reservoir and embeds them into the cracks. After the granular acid is slowly released, densely connected potholes will be corroded on the surface of the cracked rock to form a backflow channel. The above is the overall workflow of the present invention, and this step can be repeated the next time it is used.

[0029] It can be seen from the above embodiments that the beneficial effects of the present invention are:

[0030] The foam particle size of the mixed solution is refined by a high-pressure microbubble generator, which can significantly improve the stability of the foam. The stable foam can maintain its shape under high-pressure environment and is not easy to break, thereby enhancing the pressure-bearing capacity of the fracturing fluid. The formed microbubble acid solution is not only stable, but also has high pressure resistance, which means that it can better resist the formation pressure during the fracturing process and ensure the fracturing effect. The microbubble acid has a significant sand-carrying capacity and can effectively bring a certain amount of microparticles into the reservoir and embed them into the cracks. These microparticles play a supporting role in the cracks, preventing the cracks from closing, while increasing the complexity and surface area of ​​the cracks. After the granular acid is slowly released, densely packed interconnected pits are corroded on the surface of the fractured rock. These pits not only increase the conductivity of the fractures, but also form more complex backflow channels, which are beneficial to the flow and exploitation of oil and gas resources. The slow-release corrosion effect of the granular acid on the surface of the fractured rock can form more uniform corrosion pits, which are interconnected to form efficient oil and gas flow channels. By improving the permeability and conductivity of the reservoir, this fracturing device can significantly increase the production of oil or gas wells. At the same time, due to the complexity of the fractures and the increase in surface area, the efficiency of oil and gas resource exploitation is also improved.

[0031] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A microbubble solid acid slow-release fracturing device, characterized in that: The invention comprises an acid liquid tank (1), wherein the output end of the acid liquid tank (1) is connected to one end of a delivery pipe (21), the other end of the delivery pipe (21) is connected to the input end of a low-pressure manifold (3), the delivery pipe (21) is provided with a liquid supply pump (2), the output end of the low-pressure manifold (3) is connected to one end of a delivery pipe (22), the other end of the delivery pipe (22) is connected to the input end of a fracturing vehicle (4), the output end of the fracturing vehicle (4) is connected to one end of a delivery pipe (23), the delivery pipe (23) is connected to the input end of a fracturing vehicle (4), the output end of the fracturing vehicle (4) is connected to one end of a delivery pipe (23), and the delivery pipe (23) is connected to the input end of a low-pressure manifold (3). The other end of the delivery pipe (23) is connected to the input end of the high-pressure manifold (5), the output end of the high-pressure manifold (5) is connected to one end of the high-pressure tee (6), the other end of the high-pressure tee (6) is connected to the input end of the high-pressure microbubble generator (8), the lower end of the high-pressure tee (6) is connected to the liquid nitrogen pump (7), the side wall of the low-pressure manifold (3) is connected to the output end of the proportional pump (10), and the input end of the proportional pump (10) is connected to the output end of the foaming agent and solid particle acid mixing tank (12).

2. A microbubble solid acid slow-release fracturing device according to claim 1, characterized in that: The high-pressure microbubble generator (8) comprises a shell (18), one end of which is provided with a liquid outlet (19), the other end of which is provided with a liquid inlet (20), the liquid inlet (20) being connected to the other end of a high-pressure tee (6), one end of the interior of the shell (18) being provided with a shear spoiler plate 1 (14), one side of which is provided with a right-handed spiral spoiler body (17), one side of which is provided with a shear spoiler plate 2 (15), one side of which is provided with a left-handed spiral spoiler body (16), the shear spoiler plate 2 (15) and the shear spoiler plate 1 (14) having the same structure.

3. A microbubble solid acid slow-release fracturing device according to claim 2, characterized in that: The liquid nitrogen pump (7) is externally connected to liquid nitrogen.

4. A method for using a microbubble solid acid slow-release fracturing device, characterized in that: The microbubble solid acid slow-release fracturing device according to claim 3 comprises the following steps: Step 1: The acid solution in the acid solution tank (1) is fed into the low-pressure manifold (3) by the liquid supply pump (2), and the mixed solution of the foaming agent and the solid particle acid in the foaming agent and solid particle acid mixing tank (12) is transported into the low-pressure manifold (3) by the proportional pump (10); Step 2: After merging with the acid solution, the liquid enters the soil fracturing vehicle (4), enters the delivery pipe 3 (23) through the output end of the fracturing vehicle (4), enters the high-pressure tee (6) through the high-pressure manifold (5), and the liquid nitrogen pump (7) is connected to liquid nitrogen. After merging with the foaming agent, solid granular acid and acid solution, the liquid enters the high-pressure microbubble generator (8); Step 3: The foam particles are refined by a high-pressure microbubble generator (8) to form a microbubble acid solution with good stability, high pressure bearing capacity and strong sand carrying capacity, which is then injected into the wellhead. The sand carrying capacity of the microbubble acid brings a certain amount of microparticles into the reservoir and embeds them into the cracks. After the granular acid is slowly released, it will corrode densely connected pits on the surface of the cracked rock, forming a backflow channel.

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